WO2020018914A1 - Process for preparation of o, o-dimethyl phosphoramidothioate and n-(methoxy-methylsulfanylphosphoryl) acetamide - Google Patents

Process for preparation of o, o-dimethyl phosphoramidothioate and n-(methoxy-methylsulfanylphosphoryl) acetamide Download PDF

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Publication number
WO2020018914A1
WO2020018914A1 PCT/US2019/042621 US2019042621W WO2020018914A1 WO 2020018914 A1 WO2020018914 A1 WO 2020018914A1 US 2019042621 W US2019042621 W US 2019042621W WO 2020018914 A1 WO2020018914 A1 WO 2020018914A1
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Prior art keywords
dimethyl
reacting
solution
phosphoroamidothioate
phosphorochloridothioate
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French (fr)
Inventor
Stephen CORNES
Vic PRASAD
David Huang
Kamal KATARIA
Christopher Lynn Larson
Cameron Seath Gibb
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Arysta LifeScience Inc
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Arysta LifeScience Inc
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Priority to BR112021000909-4A priority Critical patent/BR112021000909B1/en
Priority to MX2021000671A priority patent/MX2021000671A/en
Priority to EP19837894.5A priority patent/EP3823975B1/en
Priority to AU2019306638A priority patent/AU2019306638B2/en
Priority to JP2021526406A priority patent/JP7245329B2/en
Priority to CA3106821A priority patent/CA3106821C/en
Publication of WO2020018914A1 publication Critical patent/WO2020018914A1/en
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic Table
    • C07F9/02—Phosphorus compounds
    • C07F9/06—Phosphorus compounds without P—C bonds
    • C07F9/22—Amides of acids of phosphorus
    • C07F9/24—Esteramides
    • C07F9/2454—Esteramides the amide moiety containing a substituent or a structure which is considered as characteristic
    • C07F9/2479—Compounds containing the structure P(=X)n-N-acyl, P(=X)n-N-heteroatom, P(=X)n-N-CN (X = O, S, Se; n = 0, 1)
    • C07F9/2487—Compounds containing the structure P(=X)n-N-acyl, P(=X)n-N-heteroatom, P(=X)n-N-CN (X = O, S, Se; n = 0, 1) containing the structure P(=X)n-N-C(=X) (X = O, S, Se; n = 0, 1)
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
    • C07F9/00—Compounds containing elements of Groups 5 or 15 of the Periodic Table
    • C07F9/02—Phosphorus compounds
    • C07F9/06—Phosphorus compounds without P—C bonds
    • C07F9/22—Amides of acids of phosphorus
    • C07F9/24—Esteramides
    • C07F9/2404—Esteramides the ester moiety containing a substituent or a structure which is considered as characteristic
    • C07F9/2408—Esteramides the ester moiety containing a substituent or a structure which is considered as characteristic of hydroxyalkyl compounds
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N57/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic phosphorus compounds
    • A01N57/26—Biocides, pest repellants or attractants, or plant growth regulators containing organic phosphorus compounds having phosphorus-to-nitrogen bonds
    • A01N57/28—Biocides, pest repellants or attractants, or plant growth regulators containing organic phosphorus compounds having phosphorus-to-nitrogen bonds containing acyclic or cycloaliphatic radicals

Definitions

  • Insecticidal compositions including pesticides, are typically formulated to kill, harm, repel or mitigate one or more species of insect. Insecticides work in different ways. Some insecticides disrupt the nervous system, whereas others may damage their exoskeletons, repel them or control them by some other means. Because of these factors, each insecticide can pose a different level of risk to non-target insects, people, pets and the environment. In addition, the materials used to generate these compositions can present their own handling issues both before, during and after reaction. [004] Because of the complexity of such insecticidal compositions and the chemicals and reactions associated with their production, there is a constant challenge to generate insecticidal compositions in a safe and effective manner.
  • a process of making O,O-dimethyl phosphoroamidothioate including reacting sulfur with PCI 3 to form PSCI 3 , reacting the PSCI 3 formed with methanol to form O-methyl phosphorodichloridothioate, reacting the O-methyl phosphorodichloridothioate formed with methyl lye to form O,O-dimethyl phosphorochloridothioate in solution in CH 2 CI 2 , and reacting the O,O-dimethyl phosphorochloridothioate formed with sodium hydroxide and ammonium hydroxide to form 0,0-dimethyl
  • Additional embodiments include: the process described above where the O, O-dimethyl phosphoroamidothioate formed is reacted with catalytic dimethyl sulfate to form methamidophos, and the methamidophos formed is reacted with acetic anhydride to form N- (methoxy- methylsulfanylphosphoryl) acetamide, and wherein the O, O-dimethyl phosphorochloridothioate formed and the O, O-dimethyl
  • a process for the manufacture of the insecticide acephate (N- (Methoxy-methylsulfanylphosphoryl) acetamide) and its intermediates is described, resulting in enhanced safety over previously utilized methods.
  • the process shown below includes the manufacture of DMPAT (O, O-dimethyl phosphoramidothioate) and subsequently acephate without isolation of intermediates downstream of the mono-ester. Explosions have previously been known to occur when handling its intermediates (e.g., the diester shown below) and DMPAT as neat materials.
  • the process described herein includes the conversion of PSCl 3 to acephate without isolation of potentially explosive intermediates.
  • Reaction of the mono-ester with MeOH/NaOH (methanol/sodium hydroxide) in a biphasic aqueous/CH 2 Cl 2 system provides the diester as a solution in CH 2 Cl 2 , for example, in 85-88% yield and 94-95% purity.
  • the diester is telescoped directly into the reaction with NH 3 /NaOH to produce the DMPAT, again as a solution in CH 2 Cl 2 , e.g., in 98% yield and 93% purity.
  • DMPAT solution is then converted into methamidophos by reaction with catalytic dimethyl sulfate and subsequently to acephate by treatment with acetic anhydride, all as solutions in CH 2 Cl 2 .
  • Acephate is then isolated via neutralization with aqueous ammonia, crystallization and collection by filtration.
  • the DMPAT is typically produced by either batch or continuous processing in four steps as demonstrated below.
  • the first (PSCl 3 ) step typically involves conversion of phosphorus trichloride to thiophosphoryl chloride by reacting phosphorus trichloride with sulfur in presence of catalyst under inert atmosphere (e.g., nitrogen - argon).
  • the PSCl 3 product is distilled and separated as colorless, transparent liquid from the reaction mass; while the residue termed as“HEEL” is recycled back for subsequent batches.
  • the second (monoester) step typically involves reacting thiophosphoryl chloride in either a continuous or batch mode with methanol to produce O-methyl phosphorodichloridothioate (monoester).
  • By-product HC1 is miscible in excess methanol.
  • the reaction mass is washed with water either in batch or continuous mode and aqueous phase and oil phase (monoester) are separated.
  • the monoester may react further at very slow rate to produce the diester which is entrained in the oil phase.
  • the aqueous wash phase is neutralized with caustic solution. It is further treated to isolate and recycle methanol. Remaining aqueous phase containing mostly water is subjected to a conventional multi-effect evaporator to separate water and sodium chloride (for example, for industrial use).
  • the third (DMPTC1: O, O-dimethyl phosphorochloridothioate) step typically involves using the above monoester oil (crude) as such to react again with methanol in presence of base at accelerated rate to give DMPTC1).
  • the fourth (DMPAT) step typically involves reacting the diester with aqueous ammonia, liquid ammonia or NaOH/NH 4 OH to produce the DMPAT; ammonium chloride is separated from the reaction, e.g., for industrial use.
  • This reaction typically runs very clean, i.e., goes to complete conversion with no specific impurities present in the distilled PSCI 3 product at this step.
  • the monoester reacts at significant rate (e.g., 2 to 3hours) to give the diester (0,0-dimethyl phosphorochloridothioate).
  • Step 1 Thiolation (Conversion of PCl 3 to PSCl 3 )
  • Agitator and jacket heating (via high pressure steam) of the reactor is started.
  • the temperature of the reaction mass is raised from initial reflux of 80°C to 130°C from 1 to 2 hours.
  • the reaction mass is cooked at 130°C for another 2 to 3 hours maintaining a nitrogen blanket throughout (Under air or the presence of oxygen, may lead to formation of POCI3 impurity).
  • the reaction mass is checked for PSCl 3 ; PCl 3 content (end of reaction: PCl 3 is less than 0.5% ) . Once the reaction is completed, the reaction mass is cooled down to 40°C before distillation.
  • Step 2 O-methyl Phosphorodichloridothioate (Methanolysis of PSCI 3 )
  • reaction mass is maintained at 0-10°C under agitation for another 2 to 3 hours.
  • Reaction mass is analyzed for completion of reaction (PSCI 3 less than 0.5%; Mono-ester greater than 95%; Diester 2-3%; Triester less than 1%).
  • Reaction mass is then transferred to a wash reactor & Water is added into it at 0-10°C and agitated for another 1 to 2 hours. The phases are separated to provide the mono-ester which is carried forward without additional processing.
  • O-Methyl Phosphorodichloridothioate is charged to a reactor and diluted with CH 2 Cl 2 (3 liters per kilogram (L/kg)). The batch is stirred and the temperature is adjusted to -5 to 5 °C.“Methyl lye” (1.1 equivalent) is added to the batch over 2-3 hours maintaining the temperature at -5 to 5°C.“Methyl lye” is prepared by reaction of pre-chilled (0-5°C) methanol (1.1 equivalent) with aqueous sodium hydroxide (1.1 equivalent) under an inert atmosphere.
  • Step 4 DMPAT (ammonolysis) [0031] To a continuously stirring reactor system (CSTR) maintained at 40°C is simultaneously added a DCM (dichloromethane) O,O-Dimethyl
  • DMPAT The organic extracts are combined to give DMPAT as a solution in CH 2 CI 2 which may be used without further purification. DMPAT is isolated in 98% yield and about 93% purity containing about 7% trimethylthiophosphate. This product must be maintained in solution at all times.
  • the term "about” refers to a measurable value such as a parameter, an amount, a temporal duration, and the like and is meant to include variations of +/- 15% or less, preferably variations of +1-10% or less, more preferably variations of +1-5% or less, even more preferably variations of +/-1% or less, and still more preferably variations of +1-0.1% or less of and from the particularly recited value, in so far as such variations are appropriate to perform in the invention described herein. Furthermore, it is also to be understood that the value to which the modifier "about” refers is itself specifically disclosed herein.

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  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
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  • Crystallography & Structural Chemistry (AREA)
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Abstract

Preparation of O,O-dimethyl phosphoramidothioate and O,O-dimethyl phosphoroamidothioate. A process of making O,O-dimethyl phosphoroamidothioate is described including reacting sulfur with PCl3 to form PSCl3, reacting the PSCl3 formed with methanol to form O-methyl phosphorodichloridothioate, and reacting the O-methyl phosphorodichloridothioate formed with methyl lye to form O,O-dimethyl phosphorochloridothioate in solution in CH2Cl2, and reacting the O,Odimethyl phosphorochloridothioate formed with sodium hydroxide and ammonium hydroxide to form O,O-dimethyl phosphoroamidothioate in solution in CH2Cl2. Reacting the O,O-dimethyl phosphoroamidothioate formed with catalytic dimethyl sulfate to form methamidophos, and reacting the methamidophos formed with acetic anhydride to form N- (methoxymethylsulfanylphosphoryl) acetamide is also described. Throughout the process, the O,O-dimethyl phosphorochloridothioate and the O,O-dimethyl phosphoroamidothioate formed are maintained in solution in CH2Cl2 at all times.

Description

PROCESS FOR PREPARATION OF O, O-DIMETHYL
PHOSPHORAMIDOTHIOATE AND N-(METHOXY- METHYLSULFANYLPHOSPHORYL) ACETAMIDE
CROSS-REFERENCE TO RELATED APPLICATION
[001] This application claims the priority of U.S. Application No. 16/040,136 filed July 19, 2018, the disclosure of which is expressly incorporated by reference herein in its entirety.
TECHNICAL FIELD
[002] The field of art to which this invention generally pertains is insecticidal compositions.
BACKGROUND
[003] Insecticidal compositions, including pesticides, are typically formulated to kill, harm, repel or mitigate one or more species of insect. Insecticides work in different ways. Some insecticides disrupt the nervous system, whereas others may damage their exoskeletons, repel them or control them by some other means. Because of these factors, each insecticide can pose a different level of risk to non-target insects, people, pets and the environment. In addition, the materials used to generate these compositions can present their own handling issues both before, during and after reaction. [004] Because of the complexity of such insecticidal compositions and the chemicals and reactions associated with their production, there is a constant challenge to generate insecticidal compositions in a safe and effective manner.
BRIEF SUMMARY
[005] A process of making O,O-dimethyl phosphoroamidothioate is described including reacting sulfur with PCI3 to form PSCI3, reacting the PSCI3 formed with methanol to form O-methyl phosphorodichloridothioate, reacting the O-methyl phosphorodichloridothioate formed with methyl lye to form O,O-dimethyl phosphorochloridothioate in solution in CH2CI2, and reacting the O,O-dimethyl phosphorochloridothioate formed with sodium hydroxide and ammonium hydroxide to form 0,0-dimethyl
phosphoroamidothioate in solution in CH2CI2, where the O,O-dimethyl phosphorochloridothioate and O, O-dimethyl phosphoramidothioate formed is maintained throughout the process in solution in CH2CI2 at all times.
[006] Additional embodiments include: the process described above where the O, O-dimethyl phosphoroamidothioate formed is reacted with catalytic dimethyl sulfate to form methamidophos, and the methamidophos formed is reacted with acetic anhydride to form N- (methoxy- methylsulfanylphosphoryl) acetamide, and wherein the O, O-dimethyl phosphorochloridothioate formed and the O, O-dimethyl
phosphoroamidothioate formed are maintained throughout the process in solution in CH2CI2 at all times; the method described above ran as a batch process; and the method described above ran as a continuous process.
[007] These, and additional embodiments, will be apparent from the following descriptions. DETAILED DESCRIPTION
[008] The particulars shown herein are by way of example and for purposes of illustrative discussion of the various embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the invention. In this regard, no attempt is made to show details of the invention in more detail than is necessary for a
fundamental understanding of the invention, the description making apparent to those skilled in the art how the several forms of the invention may be embodied in practice
[009] The present invention will now be described by reference to more detailed embodiments. This invention may, however, be embodied in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
[0010] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for describing particular embodiments only and is not intended to be limiting of the invention. As used in the description of the invention and the appended claims, the singular forms“a,” “an,” and“the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. All publications, patent applications, patents, and other references mentioned herein are expressly incorporated by reference in their entirety. [0011] Unless otherwise indicated, all numbers expressing quantities of ingredients, reaction conditions, and so forth used in the specification and claims are to be understood as being modified in all instances by the term “about.” Accordingly, unless indicated to the contrary, the numerical parameters set forth in the following specification and attached claims are approximations that may vary depending upon the desired properties sought to be obtained by the present invention. At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should be construed in light of the number of significant digits and ordinary rounding approaches.
[0012] Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the invention are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. Any numerical value, however, inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements. Every numerical range given throughout this specification will include every narrower numerical range that falls within such broader numerical range, as if such narrower numerical ranges were all expressly written herein.
[0013] Additional advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the
description, or may be learned by practice of the invention. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
[0014] A process for the manufacture of the insecticide acephate (N- (Methoxy-methylsulfanylphosphoryl) acetamide) and its intermediates is described, resulting in enhanced safety over previously utilized methods. The process shown below includes the manufacture of DMPAT (O, O-dimethyl phosphoramidothioate) and subsequently acephate without isolation of intermediates downstream of the mono-ester. Explosions have previously been known to occur when handling its intermediates (e.g., the diester shown below) and DMPAT as neat materials.
Figure imgf000006_0001
[0015] Specifically, the process described herein includes the conversion of PSCl3 to acephate without isolation of potentially explosive intermediates. Reaction of the mono-ester with MeOH/NaOH (methanol/sodium hydroxide) in a biphasic aqueous/CH2Cl2 system provides the diester as a solution in CH2Cl2 , for example, in 85-88% yield and 94-95% purity. The diester is telescoped directly into the reaction with NH3/NaOH to produce the DMPAT, again as a solution in CH2Cl2, e.g., in 98% yield and 93% purity. This
DMPAT solution is then converted into methamidophos by reaction with catalytic dimethyl sulfate and subsequently to acephate by treatment with acetic anhydride, all as solutions in CH2Cl2. Acephate is then isolated via neutralization with aqueous ammonia, crystallization and collection by filtration. [0016] As described herein, the DMPAT is typically produced by either batch or continuous processing in four steps as demonstrated below.
[0017] The first (PSCl3) step typically involves conversion of phosphorus trichloride to thiophosphoryl chloride by reacting phosphorus trichloride with sulfur in presence of catalyst under inert atmosphere (e.g., nitrogen - argon). The PSCl3 product is distilled and separated as colorless, transparent liquid from the reaction mass; while the residue termed as“HEEL” is recycled back for subsequent batches.
[0018] The second (monoester) step typically involves reacting thiophosphoryl chloride in either a continuous or batch mode with methanol to produce O-methyl phosphorodichloridothioate (monoester). By-product HC1 is miscible in excess methanol. The reaction mass is washed with water either in batch or continuous mode and aqueous phase and oil phase (monoester) are separated. The monoester may react further at very slow rate to produce the diester which is entrained in the oil phase. The aqueous wash phase is neutralized with caustic solution. It is further treated to isolate and recycle methanol. Remaining aqueous phase containing mostly water is subjected to a conventional multi-effect evaporator to separate water and sodium chloride (for example, for industrial use).
[0019] The third (DMPTC1: O, O-dimethyl phosphorochloridothioate) step typically involves using the above monoester oil (crude) as such to react again with methanol in presence of base at accelerated rate to give DMPTC1).
[0020] The fourth (DMPAT) step typically involves reacting the diester with aqueous ammonia, liquid ammonia or NaOH/NH4OH to produce the DMPAT; ammonium chloride is separated from the reaction, e.g., for industrial use.
[0021] In greater detail, the first reaction is shown as follows:
Figure imgf000008_0001
[0022] This reaction typically runs very clean, i.e., goes to complete conversion with no specific impurities present in the distilled PSCI3 product at this step.
[0023] In the second step, the thiophosphorylchloride is reacted in excess methanol to produce the monoester:
Figure imgf000008_0002
[0024] As shown above, in a side reaction the diester is formed in low concentration, being slow to react in the absence of caustic.
[0025] In the third step, the monoester reacts at significant rate (e.g., 2 to 3hours) to give the diester (0,0-dimethyl phosphorochloridothioate).
Figure imgf000009_0001
[0026] As a side reaction a small quantity of triester is also formed during this diester formation.
[0027] In the last step shown, the diester is reacted with ammonium hydroxide and sodium hydroxide (e.g., in a continuous mode) to produce the DMPAT (0,0-dimethylphosphoramidothioate). The primary impurity in this step is trimethyl thiophosphate carried over from the previous step. The DMPAT formed may also rearrange to form methamidophos.
Figure imgf000009_0002
[0028] It is important to note that the diester and the DMPAT should be kept in solution at all times. Explosions can occur when these compounds are prepared neat. EXAMPLE 1
Step 1 : Thiolation (Conversion of PCl3 to PSCl3)
[0028] In a multipurpose glass lined reactor of suitable size, molten sulfur (120°C) is charged (see Table 1) under nitrogen blanket (For the 1st batch (Recycle -0), Sulfur is charged 40% excess with respect to PCl3 to ensure proper conversion and reflux temperature). From the metering tank, phosphorus trichloride is added under working condensers and reflux valves open to ensure reflux back of vaporized PCl3. The required quantity (see Table 1) of MEP (methyl ethyl pyridine) is added to the above reaction mixture and the reaction mass is started to be heated. (MEP Catalyst is added only for 1st and 2nd batches, while in subsequent batches it gets carried /recycles via the“HEEL”). Agitator and jacket heating (via high pressure steam) of the reactor is started. The temperature of the reaction mass is raised from initial reflux of 80°C to 130°C from 1 to 2 hours. The reaction mass is cooked at 130°C for another 2 to 3 hours maintaining a nitrogen blanket throughout (Under air or the presence of oxygen, may lead to formation of POCI3 impurity). The reaction mass is checked for PSCl3; PCl3 content (end of reaction: PCl3 is less than 0.5% ) . Once the reaction is completed, the reaction mass is cooled down to 40°C before distillation. Distillation of the PSCl3 is started under vacuum (700-710 mm (millimeters) Hg absolute; Temperature 40 °C to 70 °C (reactor temperature) and distilled clear water-like material is collected into a glass distillate receiver. Distillate is collected at about 70% to about 75% based on the reaction mass volume. The residue at the bottoms (HEEL) is cooled down and recycled for a subsequent batch (see Table 1). Subsequent conversions are continued and after about 8 to about 10 recycles, % molar yield in-hand of PSCl3 with regard to PCl3 reaches 98% (After 3 to 4 recycles, distillate exceeds 100%; after about 9 to about 10 recycles in-hand molar yield of PSCl3 with regard to PCl3 reaches 98%).
TABLE 1 : Representative Process Parameters
Figure imgf000011_0001
EXAMPLE 2
Step 2: O-methyl Phosphorodichloridothioate (Methanolysis of PSCI3)
[0029] In a glass lined reactor of suitable size with external heat exchanger & circulatory pump, pre -cooled Thiophosphoryl chloride (PSCI3 99.5% pure) is charged 40% of the total batch requirement & maintained at the same temperature in the reactor. The bottom valve of the reactor is switched on and PSCI3 is looped back to the reactor via an external heat exchanger. Once the circulation is stabilized, pre -cooled methanol (4 molar ratio; 0-5 °C) is added into a circulatory pump inlet line at the rate so as to complete its addition in 3 hours. The remaining quantity of PSCI3 (60%, 0-5°C) is also added in parallel to methanol, however, it is added via a top liquid addition port into the reactor. Post completion of addition, reaction mass is maintained at 0-10°C under agitation for another 2 to 3 hours. Reaction mass is analyzed for completion of reaction (PSCI3 less than 0.5%; Mono-ester greater than 95%; Diester 2-3%; Triester less than 1%). Reaction mass is then transferred to a wash reactor & Water is added into it at 0-10°C and agitated for another 1 to 2 hours. The phases are separated to provide the mono-ester which is carried forward without additional processing.
EXAMPLE 3
Step 3: O,O-dimethyl Phosphorochloridothioate (Diester E-118 formation)
[0030] O-Methyl Phosphorodichloridothioate is charged to a reactor and diluted with CH2Cl2 (3 liters per kilogram (L/kg)). The batch is stirred and the temperature is adjusted to -5 to 5 °C.“Methyl lye” (1.1 equivalent) is added to the batch over 2-3 hours maintaining the temperature at -5 to 5°C.“Methyl lye” is prepared by reaction of pre-chilled (0-5°C) methanol (1.1 equivalent) with aqueous sodium hydroxide (1.1 equivalent) under an inert atmosphere.
Commercial“methyl lye” may also be used. Stirring is continued at -5 to 5°C for 1 hour then analyzed for reaction completion by gas chromatography (GC). The reaction is deemed complete when the relative mono-ester concentration is less than 0.5%. Stirring is stopped and the phases are separated. O,O-dimethyl Phosphorochloridothioate (E-118, Diester) is isolated as a solution in CH2Cl2 in 85% to 88% yield and 94% to 95% purity (GC analysis). E-118 must be maintained in solution at all times.
EXAMPLE 4
Step 4: DMPAT (ammonolysis) [0031] To a continuously stirring reactor system (CSTR) maintained at 40°C is simultaneously added a DCM (dichloromethane) O,O-Dimethyl
phosphorochloridothioate (E-118), 25% sodium hydroxide maintained at 0.93 molar equivalents with respect to E-l 18, 18% ammonium hydroxide maintained at 1.41 molar equivalents with respect to E-118. The residence time of the reaction is 3 hours at 40°C. The reaction mixture is continuously removed to maintain the desired volume. The phases are separated and the aqueous phase is extracted with CH2CI2 to recover O,O-dimethyl phosphoroamidothioate
(DMPAT). The organic extracts are combined to give DMPAT as a solution in CH2CI2 which may be used without further purification. DMPAT is isolated in 98% yield and about 93% purity containing about 7% trimethylthiophosphate. This product must be maintained in solution at all times.
TABLE 2: Representative Impurity Profile
Figure imgf000013_0001
[0032] As used herein, the term "about" refers to a measurable value such as a parameter, an amount, a temporal duration, and the like and is meant to include variations of +/- 15% or less, preferably variations of +1-10% or less, more preferably variations of +1-5% or less, even more preferably variations of +/-1% or less, and still more preferably variations of +1-0.1% or less of and from the particularly recited value, in so far as such variations are appropriate to perform in the invention described herein. Furthermore, it is also to be understood that the value to which the modifier "about" refers is itself specifically disclosed herein.
[0033] These examples are merely illustrations and are not to be understood as limiting the scope and underlying principles of the invention in any way.
Various modifications of the invention in addition to those shown and described herein will become apparent to those skilled in the art form after the following examples and foregoing description. Such modifications are also intended to fall within the scope of the appended claims.
[0034] As described herein, these problems and others in this area are addressed by the invention described herein. Thus, the scope of the invention shall include all modifications and variations that may fall within the scope of the attached claims. Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

Claims

What is claimed is:
1. A process of making O,O-dimethyl phosphoroamidothioate comprising, a. reacting sulfur with PCl3 to form PSCI3,
b. reacting the PSCl3 formed with methanol to form O-methyl
phosphorodichloridothioate,
c. reacting the O-methyl phosphorodichloridothioate formed with methyl lye to form O,O-dimethyl phosphorochloridothioate in solution in CH2CI2, and
d. reacting the O,O-dimethyl phosphorochloridothioate formed with
sodium hydroxide and ammonium hydroxide to form 0,0-dimethyl phosphoroamidothioate in solution in CH2CI2,
wherein the O,O-dimethyl phosphorochloridothioate and O, O-dimehyl phosphoramidothioate formed is maintained throughout the process in solution in CH2CI2 at all times.
2. The process of claim 1 wherein the O,O-dimethyl phosphoroamidothioate formed is reacted with catalytic dimethyl sulfate to form methamidophos, and the methamidophos formed is reacted with acetic anhydride to form N- (methoxy-methylsulfanylphosphoryl) acetamide, and wherein the 0,0- dimethyl phosphorochloridothioate formed and the 0,0-dimethyl
phosphoroamidothioate formed are maintained throughout the process in solution in CH2CI2 at all times.
3. The method according to claim 2 ran as a batch process.
4. The method according to claim 2 ran as a continuous process.
PCT/US2019/042621 2018-07-19 2019-07-19 Process for preparation of o, o-dimethyl phosphoramidothioate and n-(methoxy-methylsulfanylphosphoryl) acetamide Ceased WO2020018914A1 (en)

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MX2021000671A MX2021000671A (en) 2018-07-19 2019-07-19 Process for preparation of o, o-dimethyl phosphoramidothioate and n-(methoxy-methylsulfanylphosphoryl) acetamide.
EP19837894.5A EP3823975B1 (en) 2018-07-19 2019-07-19 Process for preparation of o, o-dimethyl phosphoramidothioate and n-(methoxy-methylsulfanylphosphoryl) acetamide
AU2019306638A AU2019306638B2 (en) 2018-07-19 2019-07-19 Process for preparation of O, O-dimethyl phosphoramidothioate and N-(methoxy-methylsulfanylphosphoryl) acetamide
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CN114213456B (en) * 2021-12-17 2024-01-19 安道麦股份有限公司 Preparation method of spermine
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