The Michael-type addition of 1-nitropropene to the N-substituted esters of β-aminocrotonic acid VIIIa and VIIIc leads directly to N-substituted 2,4-dimethyl-4-carbethoxy-pyrroles IVa and IVd in good yields.
1-硝基丙烯在β-
氨基
巴豆酸VIIIa和VIIIc的N-取代的
酯上的迈克尔型加成直接以良好的产率导致N-取代的2,4-二
甲基-4-甲乙
氧基-
吡咯IVa和IVd。