A Novel Ring Transformation of 3a,5,6a-Triaryl-3,3a-dihydro-2<i>H</i>-furo[3,2-<i>b</i>]pyrrole-2,6(6a<i>H</i>)-diones into 3-Aroyl-2,5-diarylpyrrole Derivatives
作者:Shuntaro Mataka、Hiroshi Suzuki、Kazuko Uehara、Masashi Tashiro
DOI:10.1246/bcsj.65.2611
日期:1992.10
Under aqueous conditions dimethylamine, piperidine, and triethylamine catalyzed the ring-transformation reaction of triaryl-2H-furo[3,2-b]pyrrole-2,6(6aH)-diones (1), giving benzoylhydroxy-1-pyrrolines 2, which afforded benzoylpyrroles 3 upon acid-catalyzed dehydration. The lactone-ring-opened amides 6 were obtained in the reaction of 1 with methylamine, pyrrolidine, piperidine, and perhydroazepine at room temperature in ethanol. Pyrrolidine and piperidine produced pyrrolecarboxamides 7 when the reaction was carried out in aqueous ethanol under reflux. Amides 6 afforded 7 upon treatment with the amines under the above-mentioned conditions.
在水相条件下,二甲胺、哌啶和三乙胺催化了三芳基-2H-呋[3,2-b]吡咯-2,6(6aH)-二酮(1)的环转化反应,生成了苯甲酰羟基-1-吡咯啉(2),在酸催化脱水后得到苯甲酰吡咯(3)。在室温下,用乙醇中与甲胺、吡咯烷、哌啶和全氢喹啉反应,得到开环乳酮的酰胺(6)。当在水-乙醇混合液中进行回流反应时,吡咯烷和哌啶生成了吡咯羧酰胺(7)。在上述条件下,酰胺(6)与胺反应后也生成了(7)。