Base-Free 5 -exo-dig aza-Cyclization of N-Methoxyl-2-alkynylbenzamides in Water
Liu Renzhi, Yang Min, Qiu Guanyinsheng, Zhang Lianpeng, Wang Yuchao, Luo Jin
Chinese Journal of Organic Chemistry . 2020, (7): 2071 -2077 .  DOI: 10.6023/cjoc202003016