Synthesis of 1,4-Dihydropyridine Compounds Catalyzed by Humic Acid
Wei Zhenzhong, Li Jiangfei, Wang Zeyun, Li Pinhua, Wang Yongqiu
Chin. J. Org. Chem. . 2017, (7): 1835 -1838 .  DOI: 10.6023/cjoc201612055