Secondary Amine-Mediated Cyclization of Methyl Propiolate with Imines
Ma Hongfei, Huang Hao, Su Jiangling, Niu Changsheng, Wu Zhengguang, Bu Hongzhong, Li Yufeng
Chin. J. Org. Chem. . 2016, (6): 1335 -1340 .  DOI: 10.6023/cjoc201512050