Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D309/00—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings
  • C07D309/02—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having no double bonds between ring members or between ring members and non-ring members
  • C07D309/04—Heterocyclic compounds containing six-membered rings having one oxygen atom as the only ring hetero atom, not condensed with other rings having no double bonds between ring members or between ring members and non-ring members with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms

Definitions

• the present invention relates to an improved process of producing cyclo- dehydrolinalool.
• Cyclo-dehydrolinalool (c-DLL) can be used for example as an intermediate in the production of 2-vinyl-2,6,6-trimethyl-3,4,5,6-tetrahydro-2H-pyran, which is also known as limetol ® (compound of formula (III))
• non-polymeric it is meant that the acid, which is used as catalyst does not comprise a large molecule or macromolecule, which are composed of many repeated subunits. More specifically the catalysts are no ion exchangers (ion exchange resins such as for example zeolites and montmorillonite).
• the present invention relates to a process (P) for the production of the compound of formula (I)
• non-polymeric acid containing one or more sulfur (VI) atom as a catalyst, has also -for example- the following advantages:
• the process according to the present invention is always carried in the presence of at least one non-polymeric acid containing one or more sulfur (VI) atom as a catalyst.
• the sulfur atom (or the sulfur atoms) is usually and preferably part of -SO3 " or SO 4 ⁇
• the acid has a pK a value (measured in water) of less than 3, more preferably less than 2, or even less than 1 .
• the pK a value is the well-known value of the strength of an acid.
• a strong acid is almost completely dissociated in aqueous solution, to the extent that the concentration of the undissociated acid becomes undetectable.
• pKa values for strong acids can, however, be estimated by theoretical means or by extrapolating from measurements in non-aqueous solvents in which the dissociation constant is smaller, such as acetonitrile and dimethylsulfoxide.
• the present invention also relates to a process (P1 ), which is the process (P), wherein the non-polymeric acid containing one or more sulfur (VI) atom has a pK a value (measured in water) of less than 3.
• the present invention also relates to a process ( ⁇ 1 '), which is the process (P), wherein the non-polymeric acid containing one or more sulfur (VI) atom has a pK a value (measured in water) of less than 2. Therefore the present invention also relates to a process (P1 "), which is the process (P), wherein the non-polymeric acid containing one or more sulfur (VI) atom as a catalyst has a pK a value (measured in water) of less than 1 .
• the acid which is used as a catalyst can be inorganic as well as organic (as well as mixtures of both).
• the present invention also relates to a process (P2), which is the process (P), (P1 ), ( ⁇ 1 ') or (P1 ") wherein the non-polymeric acid containing one or more sulfur (VI) atom is inorganic.
• the present invention also relates to a process ( ⁇ 2'), which is the process (P), (P1 ), ( ⁇ 1 ') or (P1 ") wherein a mixture of inorganic non-polymeric acids containing one or more sulfur (VI) atom is used.
• the present invention also relates to a process (P3), which is the process (P), (P1 ), (P1 ') or (P1 ") wherein the non-polymeric acid containing one or more sulfur (VI) atom is organic.
• the present invention also relates to a process ( ⁇ 3'), which is the process (P), (P1 ), (P1 ') or (P1 ") wherein a mixture of organic non-polymeric acids containing one or more sulfur (VI) atom is used. Therefore the present invention also relates to a process (P4), which is the process (P), (P1 ), ( ⁇ 1 ') or (P1 ") wherein a mixture of at least one organic non- polymeric acids containing one or more sulfur (VI) atom and of at least one inorganic non-polymeric acids containing one or more sulfur (VI) atom is used.
• the organic acids which are used in the process according to the present invention can aliphatic as well as aromatic.
• the present invention also relates to a process (P5), which is the process (P), (P1 ), ( ⁇ 1 '), (P1 "), (P3), ( ⁇ 3') or (P4), wherein at least one organic acid is aliphatic.
• the present invention also relates to a process ( ⁇ 5'), which is the process (P), (P1 ), ( ⁇ 1 '), (P1 "), (P3), ( ⁇ 3') or (P4), wherein at least one organic acid is aromatic.
• the present invention also relates to a process (P5"), which is the process (P), (P1 ), ( ⁇ 1 '), (P1 "), (P3), ( ⁇ 3') or (P4), wherein the organic acid is saturated as well unsaturated or unsaturated.
• Suitable inorganic acids are i.e.H 2 SO 4 and HSO3CI .
• the present invention also relates to a process (P6), which is the process (P), (P1 ), ( ⁇ 1 '), (P1 "), (P2), ( ⁇ 2') or (P4), wherein the inorganic acid is chosen from the group consisting of H 2 SO 4 and HSO3CI .
• aromatic organic acids examples include i.e. p-toluenesulfonic acid, 4- chlorobenzenesulfonic acid and 2,5-dimethylbenzenesulfonic acid.
• Example of a suitable aliphatic organic acid is methanesulfonic acid.
• the present invention also relates to a process (P7), which is the process (P), (P1 ), ( ⁇ 1 '), (P1 "), (P3), ( ⁇ 3'), (P4), (P5), ( ⁇ 5') or (P5"), wherein the organic acid is chosen from the group consisting of p-toluenesulfonic acid, 4- chlorobenzenesulfonic acid, 2,5-dimethylbenzenesulfonic acid and methanesulfonic acid.
• the amount of the acid which is necessary to obtain the product in excellent yields are low (in comparison to the processes known from the prior art).
• a ratio of 20:1 of compound (II) to acid is used.
• the ratio is weight related.
• the ratio can be as low as 100:1 .
• a suitable ratio of compound (II) to acid is from 20:1 to 100:1 .
• the present invention also relates to a process (P8), which is the process (P), (P1 ), ( ⁇ 1 '), (P1 "), (P2), ( ⁇ 2'), (P3), ( ⁇ 3'), (P4), (P5), ( ⁇ 5'), (P5"), (P6) or (P7), wherein a ratio of 20:1 to 100:1 of compound (II) to acid is used.
• a further embodiment of the present invention is that the process according to the present invention can be carried in an inert solvent or in a mixture of inert solvents.
• the present invention also relates to a process (P9), which is the process (P), (P1 ), ( ⁇ 1 '), (P1 "), (P2), ( ⁇ 2'), (P3), ( ⁇ 3'), ( ⁇ 4), ( ⁇ 5), ( ⁇ 5'), ( ⁇ 5"), ( ⁇ 6), ( ⁇ 7) or ( ⁇ 8), wherein the process is carried out without any solvents.
• the present invention also relates to a process (P10), which is the process (P), (P1 ), ( ⁇ 1 '), (P1 "), (P2), ( ⁇ 2'), (P3), ( ⁇ 3'), ( ⁇ 4), ( ⁇ 5), ( ⁇ 5'), ( ⁇ 5"), ( ⁇ 6), ( ⁇ 7) or ( ⁇ 8), wherein the process is carried out in an inert solvent or a mixture of inert solvents.
• the inert solvents are usually aliphatic hydrocarbons or aromatic hydrocarbons. These aliphatic hydrocarbons or aromatic hydrocarbons need to be liquid at the reaction conditions.
• the hydrocarbons can be linear, branched and/or cyclic.
• the present invention relates to a process (P1 1 ), which is the process (P10), wherein the solvent (or solvents) is chosen from the group consisting of aliphatic hydrocarbons and aromatic hydrocarbons. Suitable solvents are for example n-hexane, cyclohexane, n-heptane, pentane and toluene. Therefore the present invention relates to a process (P12), which is the process (P10) or (P1 1 ), wherein the solvent (or more than one) is chosen from the group consisting of n-hexane, cyclohexane, n-heptane, pentane and toluene.
• the amount of the solvent (or solvent mixture) is not critical for the invention. It is used in usual amounts.
• the solvents (or solvent mixture) can be added in an equimolar amounts in regard to DLL (compound of formula (II)). But it is also possible to use more as well to use less solvent (or solvent mixture).
• a preferred range of the ratio of solvent (or solvent mixture) to DLL is 3:1 to 0.5 :1 . The ratio is weight related.
• the present invention relates to a process (P13), which is the process (P10), (P1 1 ) or (P12), wherein the range of the ratio of solvent (or solvent mixture) to compound of formula (II) is 3:1 to 0.5 :1 .
• the process according to the present invention is usually carried out at elevated temperatures. It is usually carried out at a temperature of between 30°C and 75°C (preferably 40°C - 70°C).
• the present invention relates to a process (P14), which is the process which is the process (P), (P1 ), ( ⁇ 1 '), (P1 "), (P2), ( ⁇ 2'), (P3), ( ⁇ 3'), (P4), (P5), ( ⁇ 5'), (P5"), (P6), (P7), (P8), (P9), (P10), (P1 1 ), (P12) or (P13), wherein the process according to the present invention is carried out at a temperature of between 30°C and 75°C (preferably 40°C - 70°C).
• the c-DLL (compound of formula (I)) obtained by the process according to present invention can be purified by using commonly known processes. As stated above the c-DLL is then used to produce 2-vinyl-2,6,6-trimethyl-3,4,5,6- tetrahydro-2H-pyran via hydrogenation.
• the hydrogenation of c-DLL can be done by using commonly known hydrogenation processes. Usually it is done by catalytic hydrogenation (i.e. with Lindlar catalysts):

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Nitrogen Condensed Heterocyclic Rings (AREA)

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• 2016
  • 2016-02-10 WO PCT/EP2016/052762 patent/WO2016128422A1/en not_active Ceased
  • 2016-02-10 MX MX2017010192A patent/MX381522B/es unknown
  • 2016-02-10 EP EP16704164.9A patent/EP3256457A1/en not_active Withdrawn

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