Enantioselective Assembly of Spirolactones through NHC-Catalyzed Remote γ-Carbon Addition of Enals with Isatins
作者:Xianfeng Rong、Hong Yao、Wenjing Xia、Yonglei Du、Yu Zhou、Hong Liu
DOI:10.1021/acscombsci.5b00197
日期:2016.5.9
(NHC)-catalyzed formal [4 + 2] annulation of β-methyl substituted enals with isatins was developed to construct six-membered spirolactones bearing highly congested quaternary carbon stereocentersin good yields and high enantioselectivities. The strategy realized a challenging remote γ-carbon addition of enals and chiral control of β-methyl substituted enals in the presence of the NHC catalyst only.