Palladium-Catalyzed Intramolecular Cyclization of Nitroalkenes: Synthesis of Thienopyrroles
作者:Mohamed A. El-Atawy、Francesco Ferretti、Fabio Ragaini
DOI:10.1002/ejoc.201700165
日期:2017.4.10
intramolecular amination of thiophene rings following the reduction of a nitroalkene moiety directly attached to the S-heterocyclic ring. Optimization of the ligand and reaction conditions allowed the synthesis of a series of thienopyrroles aryl/alkyl-substituted at either the 2- or 3-position of the pyrrole ring. By using low pressures of carbon monoxide (5 bars), high yields of fused bicyclic compounds have been
在存在一氧化碳的情况下,钯/菲咯啉系统在直接连接到 S-杂环上的硝基烯烃部分还原后催化噻吩环的分子内胺化。配体和反应条件的优化允许合成一系列在吡咯环的 2 位或 3 位被芳基/烷基取代的噻吩并吡咯。通过使用一氧化碳的低压(5 巴),可以获得高产率的稠合双环化合物(产率高达 98%)。