An efficient and selective synthesis of 2,5-substituted pyrroles by gold-catalysed ring expansion of alkynyl aziridines
摘要:
A range of substituted alkynyl aziridines undergo a ring expansion to afford 2,5-substituted pyrroles under gold catalysis. While effective conditions can be generated from other gold sources, a combination of Ph3PAuCl and AgOTs generate a catalyst system that provides extremely clean cycloisomerisation reactions requiring minimal work-up and purification. (C) 2010 Elsevier B.V. All rights reserved.
Copper-Catalyzed Domino Homologation and Cycloisomerization Reactions for 3-Pyrroline Synthesis
作者:Ye Ho Shin、Muchchintala Maheswara、Joon Young Hwang、Eun Joo Kang
DOI:10.1002/ejoc.201301621
日期:2014.4
catalyst for a dominoreaction sequence leading to 3-pyrrolines. The Cu(I)-catalyzed Crabbe reaction of propargyl sulfonamide and selective cycloisomerization of the allene intermediate were carried out using microwave irradiation conditions affording a wide range of 2-substituted- and 2,5-disubstituted-3-pyrrolines. Mechanistic studies of the reaction intermediates revealed two possible reaction pathways;