1,2,4-triazole-fused heterocycles: Part 1: Preparation of 5,10-dihydro-[1,2,4]-triazolo[5,1-b]quinazolines

Article abstract of DOI:10.1055/s-1994-25637

The reaction of benzophenone 1-ureidoethylidenehydrazones 9 with a mixture of triphenylphosphine, carbon tetrachloride, and triethylamine in dichloromethane provides a general route to 5,10-dihydro-[1,2,4]triazolo[5,1-h]quinazolines 7 via the electrocycli