Copper(I)-Catalyzed Substitution Reactions of Propargylic Amines: Importance of C(sp)−C(sp<sup>3</sup>) Bond Cleavage in Generation of Iminium Intermediates
作者:Tsuyuka Sugiishi、Akifumi Kimura、Hiroyuki Nakamura
DOI:10.1021/ja9109055
日期:2010.4.21
amines proceed in the presence of copper(I) catalysts. Mechanistic studies showed that C(sp)-C(sp(3)) bond cleavage assisted by nitrogen lone-pair electrons is essential for the reaction, and the resulting iminium intermediates undergo amine exchange, aldehyde exchange, and alkyne addition reactions. Because iminium intermediates are key to aldehyde-alkyne-amine (A(3)) coupling reactions, this transformation
炔丙胺的取代反应在铜 (I) 催化剂存在下进行。机理研究表明,氮孤对电子辅助的 C(sp)-C(sp(3)) 键裂解是反应必不可少的,由此产生的亚胺中间体会发生胺交换、醛交换和炔加成反应。由于亚胺中间体是醛-炔-胺 (A(3)) 偶联反应的关键,这种转化不仅对炔丙胺的重构有效,而且对在手性催化剂存在下外消旋化合物的手性诱导也有效。