InCl 3-mediated intramolecular Friedel-Crafts-type cyclization and its application to construct the [6-7-5-6] tetracyclic scaffold of liphagal - Hao Jiang; Lufeng Tian; Zhentao Li; Qi Liu; Chuang Chuang Li; Xinsheng Yao; Zhen Yang (Science China Chemistry, 2012)