Processes for producing alpha-cyanohydrin esters and alpha-hydroxy acids
申请人:Daicel Chemical Industries, Ltd.
公开号:EP0926134A2
公开(公告)日:1999-06-30
The present invention relates to a process for the preparation of compounds of formula (4) wherein a carbonyl compound of the formula (3) is reacted in the presence of a cyanogenation agent with an enol ester of the formula (1) or with an oxime ester of the formula (2):
wherein R1 through R8 have meanings given in the application.
The compound of formula (4) can be hydrolysed to obtain the corresponding compound of formula (5):
A variety of cyanohydrin esters were readily prepared from carbonyl compounds with trimethylsilyl cyanide and acid anhydride under the influence of a catalytic amount of iron(III) chloride in a convenient one-pot procedure. (c) 2005 Elsevier Ltd. All rights reserved.
VAN, ALMSICK ANDREAS;BUDDRUS, JOACHIM;HONICKE-SCHMIDT, PETRA;LAUMEN, KURT+, J. CHEM. SOC. CHEM. COMMUN.,(1989) N8, C. 1391-1393