The lipase-catalyzed transesterifications of various substituted diphenyl 1,2-ketals of glycerol have been investigated. Efficient modification of the substrate structure with bis(4-bromophenyl) ketal was found to enhance the enantioselectivity up to E=57 at 0 °C.
Organocatalytic kinetic resolution of racemic primary alcohols using a chiral 1,2-diamine derived from (S)-proline
作者:Dai Terakado、Hitomi Koutaka、Takeshi Oriyama
DOI:10.1016/j.tetasy.2005.01.034
日期:2005.3
A highly efficient and good enantioselective organocatalytic asymmetric acylation of racemic primary alcohols with acyl chlorides has been achieved catalyzed by a chiral 1,2-diamine derived from (S)-proline. (C) 2005 Elsevier Ltd. All rights reserved.
Terao, Yoshiyasu; Tsuji, Keiichiro; Murata, Masakazu, Chemical and pharmaceutical bulletin, 1989, vol. 37, # 6, p. 1653 - 1655