preferred geometry with the pyrrolyl ring orthogonal to the ketenyl group. Ketene 5 is generated from N-pyrrolylacetic acid (7) with use of Mukaiyama’s reagent, and reacts with imines forming β-lactams 10, with a product ratio correlation of log(cis/trans) with σ+. Photolysis of N-diazoacetylpyrrole (14) in MeOH gives methyl N-pyrrolylacetate (15) from 5 and also ester 17, evidently by trapping of
N-
吡咯基烯酮(5)经计算不稳定且不共轭,具有优选的几何构型,其中
吡咯基环正交于烯基。
乙炔5是使用Mukaiyama试剂从N-焦
乳酸酸(7)生成的,并与
亚胺反应形成β-内酰胺10,其产物比率与log(cis / trans)与σ +有关。N-重氮乙酰基
吡咯(14)在MeOH中的光解,从5和酯17中也可以得到N-
吡咯基
乙酸甲酯(15),这显然是通过捕获2-(1-
吡咯基酮)(21),由新的
乙烯基Wolff重排形成。