Abstract Base-catalyzed reaction of 3-aroyl-6-halopyridine-3,5-dicarbonitriles with alcohols involved successive regioselective pyrrole ring fusion at the pyridine [c] side and nucleophilic substitution of chlorine. Pyrrole ring closure is the result of initial formation of furan ring with participation of the carbonyl and cyano groups, followed by iminolactone–lactam rearrangement. The reaction in
摘要 3-芳酰基-6-卤代
吡啶-3,5-二腈与醇的碱催化反应涉及在
吡啶[ c ]侧连续的区域选择性
吡咯环融合和
氯的亲核取代。
吡咯环的封闭是
呋喃环在羰基和
氰基参与下初步形成,然后亚
氨基内酯-内酰胺重排的结果。在无
水醇中的反应得到1,6-二烷氧基-4-
氨基-1-芳基-3-氧代-2,3-二氢-1 H-
吡咯并[3,4- c ]
吡啶-7-腈。如果醇中存在
水,则产物为6-烷氧基-4-
氨基-1-芳基-1-羟基-1-羟基-3-氧代-2,3-二氢-1 H-
吡咯并[3,4- c ]
吡啶- 7-腈。