α-Hydroxylactams (8), formed by regioselective reduction or Grignard addition to pyridine-2,3-dicarboximides (7), undergo acid-catalysed cyclodehydration to give the new pyrido[2′,3′ : 3,4]-pyrrolo fused heterocyclic systems (10)–(13).
α-羟基内酰胺(8),是通过区域选择性还原或格利雅加成
吡啶到2,3-
吡啶二
酰亚胺(7)上而形成的,经过酸催化的环脱
水反应得到新的
吡啶并[2',3':3,4]-
吡咯并稠合杂环系统(10)–(13)。