Process for producing quinazolin-4-one derivative

摘要

A process for producing a quinazolin-4-one compound having the formula: [wherein R<1>, R<2>, R<3 >and R<4 >each represents a group not participating in the below-mentioned reaction, and R<1>, R<2>, R<3 >and R<4 >can be combined together to form a ring] which comprises reacting an anthranilic acid derivative having the formula: [wherein R<5 >is a hydrogen atom or a hydrocarbyl group] with a formic acid derivative in the presence of an ammonium carboxylate.