Microwave-assisted Michael-type addition of 1-(arylsulfonyl)-pyrroles and -indoles to methyl vinyl ketone using bismuth triflate as catalyst
作者:Kelsey C. Miles、Bradley J. Kohane、Benjamin K. Southerland、Daniel M. Ketcha
DOI:10.24820/ark.5550190.p010.497
日期:——
The Michael type addition of pyrroles and indoles bearing strongly electron-withdrawing N-protecting groups (e.g., arylsulfonyl-, benzoyl-) to methyl vinyl ketone have not been previously reported. We find that such alkylative processes can be effected in low to moderate yields using bismuth triflate as catalyst in conjunction with microwave irradiation.
带有强吸电子N-保护基团(例如,芳基磺酰基-、苯甲酰基-)的吡咯和吲哚与甲基乙烯基酮的迈克尔型加成以前没有报道过。我们发现,使用三氟甲磺酸铋作为催化剂并结合微波辐射,可以以低到中等的产率实现这种烷基化过程。