Synthesis of Tetrahydroisoquinolines via Cascade Reductive Amination of Isochromenylium Tetrafluoroborate with Primary Amines - Liao, Hong-Ze; Hu, Zhi-Long; Cui, Kai; Jiao, Jiao; Qin, Yong; Yao, Zhu-Jun (Synthesis, 2010)