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One-Pot Synthesis of Unsymmetrical 1,4-Diaminobutynes by Cu(I)-Catalyzed Cross-Coupling of Propiolic Acid, Secondary Amine, Aldehydes and Formaldehyde
Liu Boyu, Xu Xianjun, Huang Liliang, Feng Huangdi
Chinese Journal of Organic Chemistry . 2020, (5): 1290 -1296 .  DOI: 10.6023/cjoc201911020