作者:Jan Patjens、Paul Margaretha
DOI:10.1002/hlca.19890720818
日期:1989.12.13
The title compound 7 is obtained by reductive dehalogenation from 4-bromo-2,3-dihydro-2,2. -dimethyl-3-oxo-1H-pyrrole-1-carboxylate (8) in 90% yield, Aza-enone 7 undergoes [2 + 2] cycloaddition from the triplet state with both electron-rich and electron-deficient alkenes. The behaviour of 7 in light-induced reactions is compared to those of 2,2-dimethyl-3(2H)-furanone (1a) and of the corresponding
通过还原脱卤从4-溴-2,3-二氢-2,2获得标题化合物7。-二甲基-3-氧代-1 H-吡咯-1-羧酸酯(8)的收率为90%,氮杂-烯酮7从三重态与富电子和缺电子的烯烃一起经历[2 + 2]环加成。将7在光诱导反应中的行为与2,2-二甲基-3(2 H)-呋喃酮(1a)和相应的噻吩1b的行为进行了比较。在具有一个杂原子的这些酮基五元杂环的光二聚和环化成2,3-二甲基丁-2-烯或马来酸二甲酯中,从呋喃1a到噻吩1b到吡咯的总效率提高。7。