Cascade cyclization of methyl 2-(azidomethyl)furan-3-carboxylates with 2-cyanoacetamides. Efficient synthesis of a new heterocyclic system, furo[3,2-e][1,2,3]triazolo- [1,5-a][1,3]diazepine

Resumo

Cascade cyclization of methyl 2-(azidomethyl)furan-3-carboxylate with 2-cyanoacetamides in the presence of 2 equiv of potassium tert-butoxide afforded a series of N-substituted 5-oxo-5,9-dihydro-4H-furo-[3,2-e][1,2,3]triazolo[1,5-a][1,3]diazepine-3-carboxamides.