Preparation of the Maleic Anhydride Nucleus from Dichloro γ-Lactams: Focus on the Role of the N-Substituent in the Functional Rearrangement and in the Hydrolytic Steps
作者:Franco Ghelfi、Mariella Pattarozzi、Fabrizio Roncaglia、Andrew Parsons、Fulvia Felluga、Ugo Pagnoni、Ennio Valentin、Adele Mucci、Franco Bellesia
DOI:10.1055/s-2008-1067273
日期:2008.10
The preparation of the 3,4-dialkyl-substituted maleic anhydride nucleus, through the functional rearrangement of dichloro γ-lactams, allowed the comparison of various N-substituents in the functional rearrangement step. The 2-pyridyl group proved to be the most appropriate N-substituent for the hydrolysis of the 5-methoxy-1,5-dihydro-2H-pyrrol-2-one intermediate into the 5-hydroxy adduct, and for the
通过二氯γ-内酰胺的功能重排制备3,4-二烷基取代的马来酸酐核,可以在功能重排步骤中比较各种N-取代基。2-吡啶基被证明是最适合将 5-methoxy-1,5-dihydro-2H-pyrrol-2-one 中间体水解成 5-羟基加合物的 N-取代基。马来酰亚胺核转化为马来酸酐。用氧化锰 (IV) 实现了 5-羟基-1,5-二氢-2H-吡咯-2-酮氧化成相应的马来酰亚胺。