Catalytic Asymmetric Construction of the Tryptanthrin Skeleton via an Enantioselective Decarboxylative [4 + 2] Cyclization
作者:Guang-Jian Mei、Chen-Yu Bian、Guo-Hao Li、Shao-Li Xu、Wen-Qin Zheng、Feng Shi
DOI:10.1021/acs.orglett.7b01336
日期:2017.6.16
The first catalytic asymmetric construction of the tryptanthrin skeleton has been established, taking advantage of a palladium(0)/chiral ligand-catalyzed enantioselective decarboxylative [4 + 2] cyclization of vinyl benzoxazinanones with isatins. This reaction has not only provided a direct and efficient method for constructing chiral tryptanthrin skeleta in high yields and excellent enantioselectivities
Convergent Catalysis: Asymmetric Synthesis of Dihydroquinolines Using a Combined Metal Catalysis and Organocatalysis Approach
作者:Magnus Rueping、Jeremy Dufour、Lan Bui
DOI:10.1021/cs401176s
日期:2014.3.7
A convergent catalysis approach has been developed. The combined metal-catalyzed and organocatalyzed cascade consists of two oxidations, an aza-Michael addition and an aldol condensation, and involves a multicatalysis approach to provide 1,2-dihydroquinolines in a highlyenantioselective fashion.