[3+2] Cycloaddition of Propargylamines and α-Acylketene Dithioacetals: A Synthetic Strategy for Highly Substituted Pyrroles
作者:Yu-Long Zhao、Chong-Hui Di、Si-Di Liu、Jia Meng、Qun Liu
DOI:10.1002/adsc.201200375
日期:2012.12.14
A new [3+2] cycloaddition strategy for the direct synthesis of highly substituted pyrroles from the readily available α-acylketene dithioacetals (or related substrates) and commercially available propargylamines under mild metal-free conditions has been developed. In this reaction, the acyl group plays a critical role in driving the conjugate addition of propargylamine and further cyclization to give
已经开发了一种新的[3 + 2]环加成策略,可在无金属的条件下从容易获得的α-酰基乙烯酮二硫缩醛(或相关底物)和可商购的炔丙基胺直接合成高度取代的吡咯。在该反应中,酰基在驱动炔丙基胺的共轭加成以及进一步环化生成吡咯中起关键作用。此外,广泛的应用范围是通过N, methylprop-2通过正式的1,2-酰基迁移[3 + 2]环加成途径制备1,2,3,4-四取代的吡咯(60-70%的收率)所证实的。-yn-1-胺作为仲胺组分。