Enantioselective γ -addition reaction of rhodanines to allenoates catalyzed by chiral phosphine-carbamate
作者:Tian-Chen Kang、Lu-Ping Wu、Feng Sha、Xin-Yan Wu
DOI:10.1016/j.tet.2017.12.050
日期:2018.3
Phosphine-catalyzed enantioselective γ-additions of rhodanines to allenoates have been developed for the first time. With the employment of chiral cyclohexane-based phosphines, a wide range of substituted rhodanine derivatives containing tertiary chiral centers were constructed in good yields and high enantioselectivities.
Enantioselective Mannich reaction between rhodanines and isatin-derived ketimines to construct vicinal tetrasubstituted stereocenters
作者:Han Xu、Tian-Chen Kang、Feng Sha、Xin-Yan Wu
DOI:10.1039/c8ob01524d
日期:——
enantioselective Mannich reaction between rhodanines and isatin-derived ketimines was developed. With 2 mol% of a quinine-based tertiary amine-thiourea catalyst C2, 3,3-disubstituted oxindoles with vicinaltetrasubstituted stereocenters were obtained in moderate-to-excellent yields (43–99%) with excellent diastereoselectivities (98 : 2–99 : 1 dr) and good-to-excellent enantioselectivities (up to 97% ee). The