[EN] PROCESS FOR THE PREPARATION OF ( S ) - 3 - CYANO - 5 - METHYLHEXANOIC ACID DERIVATIVES ADN OF PREGABALIN<br/>[FR] PROCÉDÉ DE PRÉPARATION DE DÉRIVÉS D'ACIDE (S)-3-CYANO-5-MÉTHYLHEXANOÏQUE ET DE PRÉGABALINE
申请人:PFIZER MFG IRELAND
公开号:WO2012025861A1
公开(公告)日:2012-03-01
The invention provides a process for the manufacture of a compound of formula (I) using an enzyme catalysed reduction of a compound of formula (lla) or llb). Compounds of formula (I) are useful for preparing pregabalin.
“<i>Syn-Effect</i>” in the Conversion of (<i>E</i>)-α,β-Unsaturated Esters into the Corresponding β,γ-Unsaturated Esters and Aldehydes into Silyl Enol Ethers
The stereochemistry in the conversion of (E)-α,β-unsaturated esters into the corresponding β,γ-unsaturated esters, and that in the conversion of aldehydes into the silyl enol ethers, were investigated. The Z/E ratios of the resulting β,γ-unsaturated esters and the silyl enol ethers varied according to the γ-substituents of the (E)-α,β-unsaturated esters and the α-substituents of the aldehydes, respectively
A Note on Stereochemical Observations of the Deprotonation of Ethyl 2-Alkenoates
作者:Ernst-Peter Krebs
DOI:10.1002/hlca.19810640407
日期:1981.6.10
Deprotonation of ethyl (E)-2-alkenoates 1, 3 and 4 yields after protonation the double bond migrated (3 Z)-isomers 5, 7 and 9 as major products. In contrast, deprotonation and reprotonation of ethyl (Z)-2-pentenoate (2) gives the (3 E)-isomer 6 exclusively. These findings are explained by reaction paths starting from different ester conformations.