CONVENIENT ONE-POT CONVERSION OF 2-PHENYL-3, I-BENZOXAZIN-4-ONE TO 2.(O-BENZOYLAMINOPHENYL)-1,3,4-OXADIAZOLIN-5-THIONE

Abstract

2-Phenyl-3,1-benzoxazin-4-one (1) reacted with a mixture of hydrazine hydrate and carbon disulphide in the presence of potassium hydroxide to give 2-(o-benzoylaminophenyl)-1,3,4-oxadiazolin-5-thione (2) which was also formed in better yield by the reaction of o-benzoylaminobenzhydrazide (5) with carbon disulphide and potassium hydroxide. The reaction of (2) with ethyl iodide, formaldehyde in the presence of morpholine, and with amines was also investigated.

Key Words:

• 2-Phenyl-3,l-benzoxazin-4-one
• 2-(o-benzoylaminophenyl)-1,3,4-oxadiazolin-5-thione
• obenzoylaminobenzhydrazide.