CaSH Organocatalysis: Enantioselective Friedel-Crafts Alkylation of Indoles with α,β-Unsaturated Aldehydes - Tian, Tian; Pei, Bao-Jian; Li, Qing-Hua; He, Hao; Chen, Ling-Yan; Zhou, Xiang; Chan, Wing-Hong; Lee, Albert W. M. (Synlett, 2009)