Assembly of 4-Substituted 3-Nitro-1,2,3,4-tetrahydropyridines via Organocatalytic Michael Addition
作者:Lele Huo、Anqi Ma、Yihua Zhang、Dawei Ma
DOI:10.1002/adsc.201100903
日期:2012.4.16
An organocatalyticMichaeladdition of protected 2‐amino‐1‐nitroethanes to α,β‐unsaturated aldehydes followed by treatment with TFA afforded 4‐substituted 3‐nitro‐1,2,3,4‐tetrahydropyridines with good diastereoselectivity and excellent enantioselectivity. Good yields were observed in the case of β‐aryl‐substituted α,β‐unsaturated aldehydes as the substrates, while moderate yields were obtained when
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.