Enantioselective Friedel-Crafts Alkylation of Indoles with Aromatic α,β-Unsaturated Aldehydes Catalyzed by Diphenylprolinol Silyl Ether - Wang, Zhi-Jing; Yang, Jian-Guo; Jin, Jun; Lv, Xin; Bao, Weiliang (Synthesis, 2009)