Intensified synthesis of [3,4-d]triazole-fused chromenes, coumarins, and quinolones

Efficient and metal-free synthesis of [3,4-d]triazole-fused chromenes, coumarins, and quinolones has been achieved in an intensified regime using microwave heating. The smooth 1,3-dipolar cycloaddition reaction of heterocyclic nitroalkenes with sodium azide provides a rapid entry into valuable heterocyclic scaffolds with potential biological properties.