A variety of pyrrolo[3,2-b]pyrrole-2,5-diones were efficiently prepared by a new domino-reaction of ester carbanions with oxalic acid−bis(imidoyl)chlorides. This reaction proceeded by condensation of 2 equiv of the ester with the bis(imidoyl)chloride and subsequent intramolecular attack of the nitrogen atoms of the bis-enamine intermediate onto the ester groups. The products, which can be regarded
通过酯碳负离子与
草酸-双(亚
氨基)
氯化物的新型多米诺反应有效地制备了多种
吡咯并[3,2-b]
吡咯-2,5-二酮。该反应通过2当量酯与双(亚
氨基)
氯化物的缩合和随后双烯胺中间体的氮原子对酯基团的分子内攻击而进行。该产品可被视为
戊烯的双内酰胺,由于其光学特性、稳定性和低溶解度,是有用的合成
颜料。
吡咯并[3,2-b]
吡咯-2,5-二酮的UV-vis性质可以通过连接到杂环核上的取代基来有效控制。研究了新环化反应的范围和局限性。