Enzymatic preparation of optically active cyanohydrin acetates
作者:Andreas van Almsick、Joachim Buddrus、Petra Hönicke-Schmidt、Kurt Laumen、Manfred P. Schneider
DOI:10.1039/c39890001391
日期:——
A series of cyanohydrinacetates (1)–(47) of widely varying structures, potential chiral building blocks for numerous synthetic applications, has been prepared in good chemical and often high optical yields by enzymatic hydrolysis of their racemic acetates in the presence of an ester hydrolase from Pseudomonas sp.
A convenient route to 5 -methyl-3,7-octadienic acid from 2,4-hexadienal via umpolung and double cope rearrangement
作者:Klaus Fischer、Siegfried Hünig
DOI:10.1016/s0040-4020(01)82083-4
日期:1986.1
heating undergoes double Cope rearrangement forming α-trimethylsiloxy nitriles 4(E)-7 and 4(Z)-7. These compounds are smoothly transformed into 3(E)- and 3(Z)-5-methyl-3,7-octanoic acid methyl esters 3(E)-8 and 3(Z)-8. The reaction sequence may be synthetically useful since it is supposed to be applicable to different substituent patterns.