1-Methyl-2-nitropyrrolee was brominated with Br2 in AcOH, giving low yields of both 2- bromo-1-methyl-5-nitropyrrole (la, 3.7%) and 3-bromo-1-methyl-5-nitropyrrole (12.6%). This bromination procedure was not very reproducible: in some experiments we obtained only polybromo derivatives or 3-bromo-l-methylmaleimide. At-tempted brominations with Br2 in CF3COOH or CCl, were unsuccessful. A mixture of the two bromonitro derivatives was ...
