Palladium-Catalyzed Highly Enantioselective Cycloaddition of Vinyl Cyclopropanes with Imines
作者:Xiao-Bing Huang、Xian-Jing Li、Tian-Tian Li、Bo Chen、Wen-Dao Chu、Long He、Quan-Zhong Liu
DOI:10.1021/acs.orglett.9b00274
日期:2019.3.15
Palladium-catalyzed asymmetric formal [3 + 2] cycloaddition of vinyl cyclopropanes and aldimines or isatin-derived ketimines proceeded smoothly in the presence of chiral phosphoramidite ligands. The corresponding highly functionalized and optically enriched pyrrolidine or spiro[pyrrolidin-3,2′-oxindole] derivatives are obtained in up to 94% yield and with up to 96% ee and 7:1 dr.
Catalyst-Controlled Chemoselective and Enantioselective Reactions of Tryptophols with Isatin-Derived Imines
作者:Fei Jiang、Dan Zhao、Xue Yang、Fu-Ru Yuan、Guang-Jian Mei、Feng Shi
DOI:10.1021/acscatal.7b02279
日期:2017.10.6
Catalyst-controlledchemoselective and enantioselective reactions of tryptophols with isatin-derived imines were demonstrated. Under catalysis with a chiral phosphoric acid, diastereoselective and enantioselective dearomative cyclization occurred, while, in the presence of a chiral squaramide-tertiary amine, enantioselective addition occurred. Both reactions afforded 3-substituted 3-amino-oxindoles