Nucleophilic Addition of Ethyl 3-Bromodifluoromethyl-3-benzyloxyacrylate to Imines: An Effective Entry to Novel gem-Difluorinated Amino Esters and their Derivatives - Peng, Weimin; Zhao, Jingwei; He, Ping; Zhu, Shizheng (Synlett, 2006)