Preparation of alkenyl-lactic acid esters and the novel esters obtained
申请人:BASF Aktiengesellschaft
公开号:US04596889A1
公开(公告)日:1986-06-24
A process for the preparation of an alkenyl-lactic acid ester by reaction of a cyanohydrin with an alcohol in the presence of hydrogen chloride, followed by hydrolysis. The compounds obtained may be used for the preparation of alkaloids and crop protection agents, and as monomers for copolymerization.
Synthesis of (E)-1-Propenyl Ketones from Carboxylic Esters and Carboxamides by Use of Mixed Organolithium-Magnesium Reagents. Synthesis of ?-Damascone, ?-Damascone, and ?-Damascenone
作者:Charles Fehr、Jos� Galindo
DOI:10.1002/hlca.19860690127
日期:1986.2.5
The novel reagents formed by combination of allylmagnesium chloride and a strong non-nucleophilic lithium base (LiNR2) convert non- or slowly enolizable carboxylic esters or carboxamides into 2-propenyl ketones which are protected from further reaction by their in situ conversion into enolates. This modified Grignardreaction is applied to efficient syntheses of α-damascone, β-damascone, β-damascenone