Reaction of 2-phenyl-3,1-benzoxazin-4(H)-one and 2-aminobenzoyl-hydrazine-Reassignment of structure for the minor product

摘要

The structure of the minor product formed in the reaction of 2-phenyl-3,1-benzoxazin-4(H)-one with 2-aminobenzoyl-hydrazine in pyridine under reflux has been reassigned as 2-(2-aminophenyl)-5-phenyl-1,3,4-oxadiazole 3 instead of 2-phenyl-3-(2-aminobenzamido)-1,3,4-benzotriazepin-5-one 2.