Polycyclic N-heterocyclic compounds. Part 61: A novel Truce–Smiles type rearrangement reaction of 4-(2-cyanovinyloxy)butanenitriles to give cycloalkeno[1,2-d]furo[2,3-b]pyridines
The cycloalkeno[1,2-d]furo[2,3-b]pyridine skeleton was conveniently synthesized from fused 4-(2-cyanovinyloxy)butanenitriles in one step through sequential intramolecular Michael addition, β-elimination and intramolecular nucleophilic addition. This sequence thus consists of a novel Truce–Smiles type rearrangement followed by cyclization. The 5-amino derivatives were transformed further to lactams
通过连续的分子内迈克尔加成,β-消除和分子内亲核加成,一步一步地由稠合的4-(2-氰基乙烯基氧基)丁腈合成了环烯基[1,2- d ]呋喃[2,3- b ]吡啶骨架。因此,该序列由新颖的Truce-Smiles类型重排以及随后的环化组成。将5-氨基衍生物以良好的产率进一步转化为内酰胺。