作者:Hermann Poschenrieder、Eduard Eckl、Hans-Dietrich Stachel、Andreas Windt、Kurt Polborn
DOI:10.1002/jhet.5570370428
日期:2000.7
3-hydroxypyridones 8/9 (azagrevellins) were prepared by reaction of the pyrrolidinetrione 4 and diazoalkanes. The ring enlargement proceeded by anionotropic [1,2]-rearrangement introducing carbon between C-3 and C-4 or, to a lesser extent, between C-2 and C-3 due to the different migration aptitudes of the two acyl groups involved. In a cognate manner ring expansion between C-2 and C-3 occured by the interaction of
通过吡咯烷三酮4和重氮烷烃的反应制备4-羟基吡啶酮7和3-羟基吡啶酮8/9(氮杂grevellins)。由于涉及的两个酰基的迁移能力不同,阴离子[1,2]-重排使碳原子在C-3和C-4之间或在较小的程度上在C-2和C-3之间引入碳而使环扩大。通过重氮甲烷和吡咯烷三酮15的相互作用,C-2和C-3之间发生了环膨胀,最终得到了螺环氧化物16。然而,由三酮4与重氮甲烷的反应产生的二环氧化合物14获得了。在这种情况下,必须通过在C-4和C-5之间插入碳原子来实现环的同源性。在两步环扩环中,从马来酰亚胺17获得吡啶酮21和22 。