金催化的N-炔丙基乙酰胺与蒽的环化反应可以通过两种不同的机理进行。在末端N-炔丙基炔基酰胺的情况下,其生成的α-亚氨基金卡宾与链状炔反应生成乙烯基阳离子以实现水解,经p处理后最终生成吡咯并[2,3- b ]喹啉衍生物甲苯磺酸。对于内部炔烃,其α-亚氨基金卡宾通过乙烯基阳离子或烯基金卡宾与链状炔反应。两种途径最终都会导致生成4-酮-2-氨基吡咯衍生物。我们的机理分析表明,对于末端乙酰胺,水是比蒽乙更好的亲核试剂,而水和蒽甲对内部乙酰胺具有同等的反应性。
Generation of Donor/Donor Copper Carbenes through Copper-Catalyzed Diyne Cyclization: Enantioselective and Divergent Synthesis of Chiral Polycyclic Pyrroles
作者:Feng-Lin Hong、Ze-Shu Wang、Dong-Dong Wei、Tong-Yi Zhai、Guo-Cheng Deng、Xin Lu、Rai-Shung Liu、Long-Wu Ye
DOI:10.1021/jacs.9b09303
日期:2019.10.23
yields with wide substratescope and excellent enantioselectivities (up to 97:3 e.r.). Importantly, this protocol represents the first copper-catalyzed asymmetric diyne cyclization. Moreover, mechanisticstudies revealed that the generation of donor/donor copper carbenes is presumably involved in this 1,5-diyne cyclization, which is distinctively different from the related gold catalysis, and thus it constitutes