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.
PyBidine–NiCl<sub>2</sub>-Catalyzed Asymmetric Addition of Alcohols and Peroxides to Isatin-Derived Ketimines
作者:Takayoshi Arai、Kento Tsuchiya、Eri Matsumura
DOI:10.1021/acs.orglett.5b00928
日期:2015.5.15
An (S,S)-diphenyldiamine-derived bis(imidazolidine)pyridine (PyBidine)-NiCl2 complex catalyzed the asymmetric addition of methanol and peroxides to isatin-derived N-Boc-imines to form chiral quaternary N,O-acetals at the C3 position of the resulting oxiindoles in up to 99% yield with 94% ee.
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.