Chiral Brønsted acid catalyzed intermolecular Friedel–Crafts alkylation of styrenes with indoles: construction of all-carbon quaternary stereocenters
作者:Ming-Li Li、Dian-Feng Chen、Shi-Wei Luo、Xiang Wu
DOI:10.1016/j.tetasy.2015.01.005
日期:2015.2
A chiralBrønstedacidcatalyzedFriedel–Craftsreaction of terminal 1,1-diaryalkenes with indoles is described. This reaction provides indole derivatives with acyclic all-carbon quaternary stereocenters in excellent yields and with excellent enantioselectivities, and features high atom efficiency without the generation of side products.
An efficient asymmetric hydroesterfication of diarylmethyl carbinols is developed for the first time with a Pd‐WingPhos catalyst, resulting in a series of chiral 4‐aryl‐3,4‐dihydrocoumarins in excellent enantioselectivities and good yields. The method features mild reaction conditions, a broad substrate scope, use of easily accessible starting materials, and low palladium loadings. A plausible stereochemical