Directed Cobalt-Catalyzed C–H Activation to Form C–C and C–O Bonds in One Pot via Three-Component Coupling
作者:Meng-Hui Li、Xiao-Ju Si、He Zhang、Dandan Yang、Jun-Long Niu、Mao-Ping Song
DOI:10.1021/acs.orglett.0c04122
日期:2021.2.5
Herein, we disclose an efficient cobalt-catalyzed three-component coupling of benzamides, diazo compounds, and tert-butyl hydroperoxide, which provides an efficient approach to construct C(sp2)–C(sp3) and C–O bonds in one-pot accompanied with C–H activation. This protocol features low catalyst loading (4 mol %), the avoidance of additives, and excellent functional group compatibility, providing three-component
Rh(II)/Chiral Phosphoric Acid-Cocatalyzed Enantioselective Synthesis of Spirooxindole-Fused Thiaindans
作者:Guolan Xiao、Tiantian Chen、Chaoqun Ma、Dong Xing、Wenhao Hu
DOI:10.1021/acs.orglett.8b01833
日期:2018.8.3
An asymmetric strategy for the construction of chiral sulfur-containing spirooxindole-fused heterocycles was achieved via a rhodium(II)/chiral phosphoric acid-cocatalyzed reaction between 2-mercaptophenyl ketones and 3-diazooxindoles. With this method, a series of spirooxindole-thiaindan derivatives bearing two contiguous quaternarycarbon stereogenic centers were obtained in high yields with high