Classifications

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  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P3/00—Drugs for disorders of the metabolism
  • A61P3/06—Antihyperlipidemics
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/16—Amides, e.g. hydroxamic acids
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
  • A61K31/00—Medicinal preparations containing organic active ingredients
  • A61K31/16—Amides, e.g. hydroxamic acids
  • A61K31/165—Amides, e.g. hydroxamic acids having aromatic rings, e.g. colchicine, atenolol, progabide
  • A61K31/167—Amides, e.g. hydroxamic acids having aromatic rings, e.g. colchicine, atenolol, progabide having the nitrogen of a carboxamide group directly attached to the aromatic ring, e.g. lidocaine, paracetamol
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P9/00—Drugs for disorders of the cardiovascular system
  • A61P9/10—Drugs for disorders of the cardiovascular system for treating ischaemic or atherosclerotic diseases, e.g. antianginal drugs, coronary vasodilators, drugs for myocardial infarction, retinopathy, cerebrovascula insufficiency, renal arteriosclerosis
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C319/00—Preparation of thiols, sulfides, hydropolysulfides or polysulfides
  • C07C319/02—Preparation of thiols, sulfides, hydropolysulfides or polysulfides of thiols
  • C07C319/06—Preparation of thiols, sulfides, hydropolysulfides or polysulfides of thiols from sulfides, hydropolysulfides or polysulfides
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C323/00—Thiols, sulfides, hydropolysulfides or polysulfides substituted by halogen, oxygen or nitrogen atoms, or by sulfur atoms not being part of thio groups
  • C07C323/23—Thiols, sulfides, hydropolysulfides or polysulfides substituted by halogen, oxygen or nitrogen atoms, or by sulfur atoms not being part of thio groups containing thio groups and nitrogen atoms, not being part of nitro or nitroso groups, bound to the same carbon skeleton
  • C07C323/39—Thiols, sulfides, hydropolysulfides or polysulfides substituted by halogen, oxygen or nitrogen atoms, or by sulfur atoms not being part of thio groups containing thio groups and nitrogen atoms, not being part of nitro or nitroso groups, bound to the same carbon skeleton at least one of the nitrogen atoms being part of any of the groups, X being a hetero atom, Y being any atom
  • C07C323/40—Y being a hydrogen or a carbon atom
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C327/00—Thiocarboxylic acids
  • C07C327/20—Esters of monothiocarboxylic acids
  • C07C327/30—Esters of monothiocarboxylic acids having sulfur atoms of esterified thiocarboxyl groups bound to carbon atoms of hydrocarbon radicals substituted by nitrogen atoms, not being part of nitro or nitroso groups
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C327/00—Thiocarboxylic acids
  • C07C327/20—Esters of monothiocarboxylic acids
  • C07C327/32—Esters of monothiocarboxylic acids having sulfur atoms of esterified thiocarboxyl groups bound to carbon atoms of hydrocarbon radicals substituted by carboxyl groups
  • C07C327/34—Esters of monothiocarboxylic acids having sulfur atoms of esterified thiocarboxyl groups bound to carbon atoms of hydrocarbon radicals substituted by carboxyl groups with amino groups bound to the same hydrocarbon radicals
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D277/00—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings
  • C07D277/60—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings condensed with carbocyclic rings or ring systems
  • C07D277/62—Benzothiazoles
  • C07D277/64—Benzothiazoles with only hydrocarbon or substituted hydrocarbon radicals attached in position 2
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C2601/00—Systems containing only non-condensed rings
  • C07C2601/12—Systems containing only non-condensed rings with a six-membered ring
  • C07C2601/14—The ring being saturated

Definitions

• the present invention relates to a process for the preparation of S-[2-[l-(2- ethylbutyl)cyclohexylcarbonylamino] -phenyl] 2-methylthiopropionate which is a useful pharmaceutically active compound.
• the invention provides a process for the preparation of a compound of formula ( ⁇ ):
• X 1 and X 2 or X 2 and X 3 or X 3 and X 4 together with the carbon atoms to which they are attached form a four, five or six membered cycloalkyl ring that optionally includes an additional heteroatom selected from O, NH and S wherein the heresaid four, five or six membered cycloalkyl ring is optionally substituted with one to three substituents independently selected from with (Ci- Q)alkyl or aryl;
• R a , R b , R c and R d are independently (Ci- C 8 )alkyl, (C 3 - C 8 )cycloalkyl, aryl or heteroaryl; each R e are independently hydrogen, (Ci- Q)alkyl or aryl;
• R a , R b , R c , R d , R e , X 1 , X 2 , X 3 and X 4 are as defined above,
• the present invention does not require a pretreatment of the catalyst, in particular, there is no need of sulfide pretreatment of the catalysts.
• halo or halide means fluoro, chloro, bromo or iodo, in particular chloro or bromo.
• (Ci- C8)alkyl refers to a branched or straight hydrocarbon chain of one to eight carbon atoms, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec -butyl, t-butyl, ethyl- butyl, pentyl, hexyl, heptyl and octyl.
• (Ci- C8)alkoxy means a moiety of the formula -OR ab , wherein R ab is an (Ci- C8)alkyl moiety as defined herein.
• alkoxy moieties include, but are not limited to, methoxy, ethoxy, isopropoxy, and the like.
• (C 3 - C8)cycloalkyl refers to a single saturated carbocyclic ring of thee to eight ring carbons, such as cyclopropyl, cyclobutyl, cyclopentyl and cyclohexyl. Cycloalkyl may optionally be substituted with one or more substituents, preferably one, two or three, substituents.
• cycloalkyl substituent is selected from the group consisting of (Ci- C8)alkyl, hydroxy, (Ci- C8)alkoxy, halo(Ci- C8)alkyl, halo(Ci- C8)alkoxy, halo, amino, mono- and di(Ci- C8)alkylamino, hetero(Ci- C8)alkyl, acyl, aryl and heteroaryl.
• Aryl means a monovalent monocyclic or bicyclic aromatic hydrocarbon moiety which is optionally substituted with one or more, preferably one, two or three, substituents, each of which is preferably selected from the group consisting of (Ci- C8)alkyl, hydroxy, (Ci- C8)alkoxy, amino, mono- and di(Ci- C8)alkylamino, carboxy, (Ci- C8)alkylsulfonyl, -S0 2 - aryl, -S0 3 H, -S0 3 -(Ci- C8)alkyl or -S0 2 -NR aC 2, wherein each R ac is independently hydrogen or (Ci- C8)alkyl. More specifically the term aryl includes, but is not limited to, phenyl, 1- naphthyl, 2-naphthyl, and the like, each of which can be substituted or unsubstituted.
• Heteroaryl means a monovalent monocyclic or bicyclic moiety of 5 to 12 ring atoms having at least one aromatic ring containing one, two, or three ring heteroatoms selected from N, O, or S (preferably N or O), the remaining ring atoms being C, with the
• the heteroaryl ring is optionally substituted independently with one or more substituents, preferably one, two or three substituents, each of which is independently selected from (Ci- C 8 )alkyl, halo(Ci- C 8 )alkyl, hydroxy, (Ci- C 8 )alkoxy, halo, nitro and cyano. More
• heteroaryl includes, but is not limited to, pyridyl, furanyl, thienyl, thiazolyl, isothiazolyl, triazolyl, imidazolyl, isoxazolyl, pyrrolyl, pyrazolyl, pyrimidinyl, benzofuranyl, tetrahydrobenzofuranyl, isobenzofuranyl, benzothiazolyl, benzoisothiazolyl, benzotriazolyl, indolyl, isoindolyl, benzoxazolyl, quinolyl, tetrahydroquinohnyl, isoquinolyl, benzimidazolyl, benzisoxazolyl or benzothienyl, imidazo[l,2-a]-pyridinyl, imidazo[2,l- b]thiazolyl, and the derivatives thereof.
• Heterogeneous transition metal hydrogenation catalyst refers to a transition metal hydrogenation catalyst which acts in different phase than the substrate. Especially the transition metal hydrogenation catalyst is in the solid phase. In particular while the transition metal hydrogenation catalyst is in the solid phase the reactants are in the liquid phase.
• the transition metal hydrogenation catalyst contains a transition metal which forms one or more stable ions which have incompletely filled d orbitals (i.e. Pd, Pt, Rh, Au, Ni, Co, Ru, Ir) in particular noble metal, such as Pd, Pt, Rh or Au.
• Pd, Pt, Rh i.e. Pd, Pt, Rh, Au, Ni, Co, Ru, Ir
• noble metal such as Pd, Pt, Rh or Au.
• the transition metal is in particular "supported", which means that the catalyst is dispersed on a second material that enhances the effectiveness.
• the "support” can be merely a surface on which the metal is spread to increase the surface area.
• the supports are porous materials with a high surface area, most commonly alumina or various kinds of carbon. Further examples of supports include, but are not limited to, silicon dioxide, titanium dioxide, calcium carbonate, barium sulfate, diatomaceous earth and clay.
• the metal itself can also act as a support, if no other support is present. More specifically the term "heterogeneous transition metal hydrogenation catalyst” includes but is not limited to, a Raney catalyst (e.g. Ra-Ni, Ra-Co,) Pd/C,
• the "heterogeneous transition metal hydrogenation catalyst” are not pre-treated with sulphide.
• area% for a substance A refers to the (area of substance A)/(sum of areas of all peaks)xl00, area as obtained from HPLC or GC analysis.
• R 1 is (Ci-C 8 )alkyl or aryl
• R a , R b , R c and R d are independently (Ci- C ⁇ alkyl, (C 3 - C ⁇ cycloalkyl, aryl or heteroaryl; each R e are independently hydrogen, (Ci- C8)alkyl or aryl;
• the present invention provides a process for the preparation of a compound of formula ( ⁇ '):
• R a , R , R c and R a are independently (Ci- C 8 )alkyl, (C 3 - C 8 )cycloalkyl, aryl or heteroaryl; each R e are independently hydrogen, (Ci- C 8 )alkyl or aryl;
• R d is (C 3 - C 8 )cycloalkyl substituted by (Ci- C 8 )alkyl, in particular R d is (2-Ethyl-butyl)- cyclohexyl;
• R e are hydrogen
• R a , R , R c , R a , R , X , X , X and X 4 are as defined above, with H 2 in the presence of a heterogeneous transition metal hydrogenation catalyst.
• the present invention provides a process for the preparation of a compound of formula ( ⁇ "):
• R a , R b , R c and R d are independently (C C 8 )alkyl, (C 3 - C 8 )cycloalkyl, aryl or heteroaryl; each R e are independently hydrogen, (Ci- C 8 )alkyl or aryl;
• R 1 is (Ci-C 8 )alkyl or aryl
• R d is (C 3 - C 8 )cycloalkyl substituted by (Ci- C 8 )alkyl, in particular R d is (2-Ethyl-butyl)- cyclohexyl;
• R e are hydrogen
• R a , R b , R c , R d , R e , X 1 , X 2 , X 3 and X 4 are as defined above, with H 2 in the presence of a heterogeneous transition metal hydrogenation catalyst.
• the present invention provides a process for the preparation of compound of formula ( ⁇ ):
• the present invention provides a process for the preparation compounds of formula ( ⁇ ) and Formula(X):
• the present invention provides a process for the preparation compounds of formula ( ⁇ ) and Formula(X):
• the present invention provides a process for the preparation of a compound of formula ( ⁇ ):
• the present invention provides a process for the preparation of a compound of formula (la):
• R 1 is isopropyl, which comprises reacting a compound of formula ( ⁇ ):
• the acylating agent is isobutyric anhydride or isobutyryl halide, in particular isobutyric anhydride.
• the present invention provides a process for the preparation of compounds of formula (la) and Formula (X):
• the acylating agent is isobutyric anhydride or isobutyryl halide, in particular isobutyric anhydride.
• the present invention provides a process for the preparation of a compound of formula (I):
• the present invention provides a process for the preparation of compounds of formula (I) and Formula(X):
• R is H or with H 2 in the presence of acylating agent such as isobutyric anhydride or isobutyryl halide, more particularly the acylatign agent is isobutyric anhydride.
• acylating agent such as isobutyric anhydride or isobutyryl halide, more particularly the acylatign agent is isobutyric anhydride.
• the present invention provides a process for the preparation of a compound of formula (la):
• R 1 is isopropyl, which comprises reacting a compound of formula (II):
• the acylating agent is isobutyric anhydride or isobutyryl halide, in particular isobutyric anhydride.
• the present invention provides a process for the preparation of compounds of formula (la) and Formula(X):
• R 1 is (Ci-Q)alkyl or aryl, in particular R 1 is isopropyl, which comprises reacting a compound of formula (II):
• the acylating agent is isobutyric anhydride or isobutyryl halide, in particular isobutyric anhydride.
• the present invention provides a process for the preparation of a compound of formula (I):
• acylating agent such as isobutyric anhydride or isobutyryl halide, in particular isobutyric anhydride.
• the present invention provides a process for the preparation of compounds of formula (I) and Formula(X):
• acylating agent such as isobutyric anhydride or isobutyryl halide, in particular isobutyric anhydride.
• the present invention provides a process for the preparation of S- [2-([[l-(2-ethylbutyl)-cyclohexyl]-carbonyl]amino)phenyl]2-methylpropanethioate comprising the formation of a compound of formula ( ⁇ ):
• the present invention as described above may be carried out in the presence of a solvent or a mixture of two or more solvents.
• the solvent is an organic solvent such as the ether like solvent (e.g. tetrahydrofuran, methyl tetrahydrofur an, diisopropyl ether, t- butylmethyl ether or dibutyl ether) ester like solvent (e.g. ethyl acetate, isopropyl acetate butyl acetate), aliphatic hydrocarbon solvent (e.g. hexane, heptane or pentane), saturated alicyclic hydrocarbon solvent (e.g.
• the ether like solvent e.g. tetrahydrofuran, methyl tetrahydrofur an, diisopropyl ether, t- butylmethyl ether or dibutyl ether
• ester like solvent e.g. ethyl acetate, isopropyl acetate
• the hydrogenation step according to the present invention is carried out in the presence of a solvent selected from ether like solvent, ester like solvent, aliphatic hydrocarbon solvent, saturated alicyclic hydrocarbon solvent or aromatic solvent or mixture thereof, when no acylating agent is present, more particularly the solvent is aliphatic hydrocarbon solvent, saturated alicyclic hydrocarbon solvent or aromatic solvent.
• anhydride derivative in another embodiment can act as a solvent or co-solvent, e.g. molar ratio anhydride/amidodisulfide of 2 to 20, in particular 2 to 5.
• the present invention provides a process as described above, wherein the acylating agent is isobutyric anhydride.
• the acylating agent is isobutyric anhydride.
• 2.0 to 4.0 equivalents of isobutyric anhydride with respect to disulfide of formula (II) are used. More particularly, 2.5 to 3.5 equivalents are used.
• the present invention provides a process as described above wherein the reaction is carried out at temperature up to 150°C, in particular between 25 °C and 150°C, more particularly between 60°C to 90°C, most particularly at 80°C.
• the present invention provides a process as described above wherein the H 2 is added at a pressure of at least 0.1 bar, particularly at a pressure between 0.1 to 100 bar, more particularly at a pressure between 0.2 bar to 30 bar, most particularly 5 to 25 bar.
• the present invention provides a process as described above wherein the heterogeneous transition metal hydrogenation catalyst is a Raney catalyst, Pd/C, Pd(OH) 2 /C, Nanoparticulate Palladium(O) microencapsulated in polyurea matrix (NP Pd(0) EncatTM 30),Au/TiO 2 , Rh/C, Ru/Al 2 0 3 , Ir/CaC0 3 , or Pt/C, or a mixture thereof, particularly the heterogeneous transition metal hydrogenation catalyst is a Raney catalyst, Pd/C, Pd(OH) 2 /C, Au/Ti0 2 , Rh/C, Ru/Al 2 0 3 , Ir/CaC0 3 , or Pt/C, or a mixture thereof, more particularly the heterogeneous transition metal hydrogenation catalyst is Pd/C, Pd(OH) 2 /C, Au/Ti0 2 , Rh/C, Ra-Ni or Pt/C, most particularly the heterogeneous transition metal
• the hydrogenation can be run in the presence of a molar excess of palladium towards the disulfide. More conveniently, palladium is used in catalytic amounts, e.g. 0.001 to 0.1 equivalents, preferred 0.01 to 0.1 equivalents with respect to the disulfide.
• the catalyst can be re-used several times such that the ratio between the disulfide converted and the moles of palladium employed is increased correspondently.
• the present invention provides a compound of formula (X):
• the process comprises reacting a
• acyl halide of formula (III) cyclohexanecarboxylic acid derivative of formula (IV) with a halogenating agent, such as PX 3 , PX 5 , SOX 2 or NCX, COX 2 to obtain the acyl halide of formula (III).
• the halogenating step is preferably carried out in the presence of tri-(Ci-C5)alkylamine.
• the process comprises reacting acyl halide with bis(2-aminophenyl)disulfide to acylate the amino groups of the bis(2-aminophenyl)disulfide in the presence of a base (eg. N- methylmorpholine, di-N-methylpiperazine, pyridine) .
• a base eg. N- methylmorpholine, di-N-methylpiperazine, pyridine
• the starting materials, reagents and catalysts which do not have their synthetic route explicitly disclosed herein, are generally available from commercial sources or are readily prepared using methods known to the person skilled in the art.
• the compounds of formulae (II) and (IV) can be prepared according to the procedures described in Shinkai et al., J. Med. Chem. 43:3566-3572 (2000), WO 2007/051714 or WO 2008/074677.
• the preparation of the compound of formula (IV) comprises the preparation of a
• the compound of formula (VI) can be prepared:by reacting compound of formula (VII)
• an alkylating agent such as 1 -halo-2-ethylbutane, or 2-ethyl- 1 -butanol
• a Grignard reagent such as (Ci-C 6 )alkyl-magnesium-halide, phenyl-magnesium-halide, heteroaryl- magnesium-halide or (C3-C 6 )cycloakyl-magnesium-halide.
• the above mentioned coupling reaction is carried out in the presence of a secondary amine.
• the Grignard reagent is added to the cyclohexanecarbonitrile, more particularly in the presence of a secondary amine, followed by the addition of an alkylating agent, as defined above.
• the above mentioned coupling reaction is followed by a mineral acid quenching, such as hydrofluoric acid, hydrochloric acid, boric acid, acetic acid, formic acid, nitric acid, phosphoric acid or sulfuric acid, most particularly by hydrochloric acid.
• a mineral acid quenching such as hydrofluoric acid, hydrochloric acid, boric acid, acetic acid, formic acid, nitric acid, phosphoric acid or sulfuric acid, most particularly by hydrochloric acid.
• nitrosylating agent can be generated in situ e.g. mixing H2S04 and nitrous acid (HN02) or H2S03/HN03 or N203/H2S04 or HN03/S02 to obtain nitrosulfuric acic (NOHS04).
• (I) comprising a compound of formula (V) (V) and having less than 0.1 % of the compound of formula (V) by weight.
• the present invention provides a compound of formula (I):
• the invention provides a pharmaceutical composition
• a pharmaceutical composition comprising a compound of formula (I), also known as thioisobutyric acid S-(2- ⁇ [l-(2-ethyl-butyl)- cyclohexanecarbonyl] -amino ⁇ -phenyl) ester, S- [2-( [ [ 1 -(2-ethylbutyl)-cyclohexyl] - carbonyl] amino )phenyl]2-methylpropanethioate or as dalcetrapib, and a compound of formula (I), also known as thioisobutyric acid S-(2- ⁇ [l-(2-ethyl-butyl)- cyclohexanecarbonyl] -amino ⁇ -phenyl) ester, S- [2-( [ [ 1 -(2-ethylbutyl)-cyclohexyl] - carbonyl] amino )phenyl]2-methylpropan
• the invention provides a pharmaceutical composition
• a pharmaceutical composition comprising a compound of formula (I) and a compound of formula (V).
• the composition comprises a compound of formula (I) and between 1 ppb and 100 ppm of compound of formula (V), more particularly between 1 ppb and lppm.
• the invention provides a pharmaceutical composition
• a pharmaceutical composition comprising a compound of formula (I), a compound of formula (X) and a compound of formula (V).
• the composition comprises a compound of formula (I), between 1 ppb and 100 ppm of compound of formula (X) and between 1 ppb and 100 ppm of compound of formula (V).
• Ar argon
• acid chloride l-(2-ethyl- butyl)-cyclohexanecarbonyl chloride
• aminodisulfide N,N'-(dithiodi-2, l-phenylene)bis[ l- (2-ethylbutyl)-cyclohexanecarboxamide]
• amidothiophenol 1 -(2-ethylbutyl)-N-(2- mercaptophenyl)-cyclohexanecarboxamide
• thioester S-[2-[l-(2- ethylbutyl)cyclohexanecarbonylamino] -phenyl] 2-methylthiopropionate
• DTD A (2,2 " - dithiodianiline); d.i. (deionized); eq. (equivalent); EtOH (ethanol); g (gram); HPLC (High- performance liquid chromatography
• the pressure indicated in the experiments is the gauge pressure, i.e. the pressure relative to the local atmospheric pressure.
• Example 4 Synthesis of S- [2- [l-(2-ethylbutyl)cyclohexanecarbonylamino] -phenyl] 2- methylthiopropionate 8.2 g of amidodisulfide (12.9 mmol) in 16.8 g toluene and 6.1 g (38.7 mmol) isobutyric anhydride was transferred together with 552 mg Pd/C (519 ⁇ Pd, EVONIK E101 N/D 10%) to a 185 mL stainless steel autoclave. It was hydrogenated under vigorous stirring for 3 hrs at the temperature of 90 °C and 5 bar (0.5 MPa). Work-up according to example 1 afforded 9.63 g of thioester as white crystals (yield 95.9%). HPLC analysis showed a purity of 100 area%.
• Example 11 Synthesis of S-[2-[l-(2-ethylbutyl)cyclohexanecarbonylamino]-phenyl] 2- methyl thiopropionate
• This example was run in an analogous manner to example 10 but using 2.0eq. isobutyric anhydride (4.1 g, 25.8 mmol,) as reagent. The mixture was hydrogenated under vigorous stirring for 18 hrs at the temperature of 80 °C and 5 bar ( 0.5 MPa). HPLC analysis showed complete conversion. Work-up according to example 1 afforded 7.05 g of thioester as white crystals (yield 68.5%). HPLC analysis showed a purity of 100 area%.

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