Regiocontrolled Synthesis of Pyrrole-2-carboxaldehydes and 3-Pyrrolin-2-ones from Pyrrole Weinreb Amides
作者:Aaron R. Coffin、Michael A. Roussell、Elina Tserlin、Erin T. Pelkey
DOI:10.1021/jo061043m
日期:2006.8.1
A regiocontrolled synthesis of 3,4-disubstituted pyrrole-2-carboxaldehydes was completed in two steps from acyclic starting materials. A Barton−Zard pyrrole synthesis between N-methoxy-N-methyl-2-isocyanoacetamide and α-nitroalkenes or β-nitroacetates provided N-methoxy-N-methyl pyrrole-2-carboxamides (pyrrole Weinreb amides), which were converted into the corresponding pyrrole-2-carboxaldehydes by
从无环起始原料开始的两步中完成了区域控制的3,4-二取代的吡咯-2-甲醛的合成。N-甲氧基-N-甲基-2-异氰基乙酰胺与α-硝基烯烃或β-硝基乙酸酯之间的Barton-Zard吡咯合成提供了N-甲氧基-N-甲基吡咯-2-羧酰胺(吡咯Weinreb酰胺),将其转化为氢化铝锂处理得到相应的吡咯-2-甲醛。吡咯-2-甲醛的区域选择性氧化得到相应的3,4-二取代的3-吡咯啉-2-酮。