Catalytic enantioselective addition of alcohols to isatin-derived N-Boc ketimines
作者:Tian-Ze Li、Xi-Bo Wang、Feng Sha、Xin-Yan Wu
DOI:10.1016/j.tet.2013.06.076
日期:2013.9
The enantioselective addition of alcohols to isatin-derived N-Boc ketimines was investigated for the first time. Isatin-derived N,O-aminals were obtained in excellent yields with moderate-to-good enantiose-lectivities (up to 78% ee) in the presence of a quinine-based bifunctional catalyst. (C) 2013 Elsevier Ltd. All rights reserved.
The 2′-phenyl cinchonidine thiourea-catalyzed asymmetric addition of alcohols to isatin-derived N-Boc ketimines
Optically active isatin-derived N,0-aminals were obtained through the catalytic asymmetric addition of various alcohols to isatin-derived N-Boc ketimines. Using 2'-phenyl cinchonidine thiourea as the catalyst, adducts were obtained in 96% yield and with up to 92% ee. (C) 2015 Elsevier Ltd. All rights reserved.
Copper-catalyzed enantioselective addition of alcohols to isatin-derived ketimines
作者:Jian Lu、Feng Sha、Xin-Yan Wu
DOI:10.1016/j.tetlet.2019.03.049
日期:2019.4
The first copper-catalyzed enantioselectiveaddition of alcohols to imines was described. In the presence of 1 mol% Cu(OAc)2 complexed with chiral cyclohexane-based N,P-ligand L4, chiral isatin-derived N,O-aminals were obtained in excellent yields (93–99%) and good-to-excellent enantioselectivities (up to 93% ee) under mild conditions.