One-pot approach to chiral chromenesvia enantioselective organocatalytic domino oxa-Michael–aldol reaction
作者:Hao Li、Jian Wang、Timiyin E-Nunu、Liansuo Zu、Wei Jiang、Shaohua Wei、Wei Wang
DOI:10.1039/b611502k
日期:——
A highly enantioselective (S)-diphenylpyrrolinol triethylsilyl ether promoted tandem oxa-Michaelâaldol reaction of α,β-unsaturated aldehydes with salicylaldehydes has been developed; the method affords one-pot access to chiral and synthetically useful chromenes in high yields and high enantioselectivities from readily available compounds.
Chiral diphenylperhydroindolinol silyl ether catalyzed domino oxa-Michael–aldol condensations for the asymmetric synthesis of benzopyrans
作者:Ya-Hui Feng、Ren-Shi Luo、Lin Nie、Jiang Weng、Gui Lu
DOI:10.1016/j.tetasy.2014.02.016
日期:2014.4
Asymmetric domino oxa-Michael-aldol reactions between trans-cinnamaldehydes and salicylic aldehyde derivatives have been developed. Using (2S,3aS,7aS)-diphenylperhydro indolinol silyl ether 4i as the catalyst, most corresponding chiral benzopyrans can be obtained with excellent chemo- and enantioselectivities. (C) 2014 Elsevier Ltd. All rights reserved.