Stereoselective synthesis of α-hydroxycyclopropanecarboxylic acids
摘要:
Cyclopropanation of chiral alpha-alkoxy acrylamides derived from 1R,2S-ephedrine and alpha-keto acids provides cyclopropyl morpholinones with good diastereoselectivity. Removal of the ephedrine portion generates alpha-hydroxycyclopropane carboxamides which are readily converted to enantiomerically enriched alpha-hydroxycyclopropanecarboxylic acids. (C) 1999 Published by Elsevier Science Ltd. All rights reserved.
Optically active cyclopropanols from the enzymatic resolution of dimethyl α-alkylsuccinates. Synthesis of chiral 2-vinylcyclobutanones and cyclohexenones.
作者:Jacques Salaun、Belkacem Karkour
DOI:10.1016/s0040-4039(00)96592-4
日期:1987.1
(+)-(R) [or (-)-(S)] dimethyl α-methylsuccinates, obtained by the enantioselectivehydrolysis of the racemicdiester by porcinepancreaticlipase, undergo acyloin cyclization followed by stereoselective ring contraction to provide 1-alkenylcyclopropanols with high enantiomeric excesses.