- Manufacturing process for sitagliptin from L-aspartic acid
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The present invention relates to a novel manufacturing process of pharmaceutically active compound of formula I used as oral anti-diabetic drug. Starting from L-aspartic acid derivate of formula IV the invention describes preparation of the chiral (R)-β-amino acid of formula II known as a precursor in the synthesis of Sitagliptin (formula I).
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Page/Page column 4-5
(2012/05/21)
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- PROCESS FOR PREPARING R-BETA-AMINO PHENYLBUTYRIC ACID DERIVATIVES
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Disclosed is a process for preparing single enantiomers of beta-amino phenylbutyric acid derivatives and pharmaceutically acceptable salts thereof, which affords the desired compounds having special optical configuration. The process comprises a step of chemical synthesis and a step of resolving the optical isomers of beta-amino phenylbutyric acid derivatives with a resolving agent. The resolving step comprises reacting the optical isomers with resolving agents, such as di-para-toluoyl-L-tartaric acid and di-para-toluoyl-D-tartaric acid. The obtained R-beta-amino phenylbutyric acid derivatives (I) have high optical purity, and the total yield of the accumulative resolution of the laevo and the dextro isomer is up to above 70%.
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- A PROCESS FOR PREPARING R-BETA-AMINO PHENYLBUTYRIC ACID DERIVATIVES
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Disclosed is a process for preparing chiral pharmaceutical intermediates of R-beta-amino phenylbutyric acid derivatives (I) and pharmaceutically acceptable salts thereof, which affords the desired object compounds having special optical configuration by chemosynthesis process comprising resolving the optical isomer mixtures of beta-amino phenylbutyric acid derivatives with resolving agent. This process comprises the resolving step of salification in alcoholic solvent or aquesous solution of alcohol with resolving agent of di-para-toluoyl-L-tartaric acid and di-para-toluoyl-D-tartaric acid. The obtained R-beta-amino phenylbutyric acid derivatives (I) have high optical purity, and the total yield of the accumulative resolution of the laevo and the dextro isomer is up to above 70%. The R-beta-amino phenylbutyric acid derivatives (I) produced by this process can be better used in synthesizing medicament.
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- PROCESS AND INTERMEDIATES FOR THE PREPARATION OF N-ACYLATED-4-ARYL BETA-AMINO ACID DERIVATIVES
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A process for producing an enantiomerically enriched, pure or enriched and essentially pure compound of Formula I [structure] wherein the R-, or S-configuration at the stereogenic center is marked with an *, which process hydrogenates an enamide compound of formula III [structure] in an organic solvent in the presence of a transition metal precursor complexed to a chiral phosphine ligand catalyst, wherein Ar is phenyl which is unsubstituted or substituted, R1 and R2 are selected from H, Cl - 8 alkyl, C5 - 12 cycloalkyl, aryl and aryl-C 1 - 2-alkyl, or R1 and R2 together with the nitrogen atom to which they are attached form a C4- r member heterocyclic πng system optionally fused with a 5- to 6- member carbocyclic or heterocyclic ring system, and the other substituents are as defined herein.
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Page/Page column 21-22
(2010/08/04)
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- Improved enzymatic syntheses of valuable β-arylalkyl-β-amino acid enantiomers
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The enantioselective (E~ 200) Burkholderia cepacia-catalysed hydrolyses of β-amino esters with H2O (0.5 equiv.) in t-BuOMe or in i-Pr2O at 45 °C are described. The enantiomers of biologically relevant β-arylalkyl-substituted β-amino acids, and especially (R)-3-amino-3-(2,4,5-trifluorophenyl)butanoic acid, the intermediate of the new antidiabetic drug sitagliptine, were prepared with high enantiomeric excesses (ee≥96%) and in good yields (≥42%). The Royal Society of Chemistry 2010.
- Tasnadi, Gabor,Forro, Enik,Fueloep, Ferenc
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experimental part
p. 793 - 799
(2010/06/20)
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