Preparation of 6-substituted-2 (1H) -quinoxalinone

摘要

A process for producing a 6-substituted 2(1H)-quinoxalinone of the formula (I): CHEM wherein X is a halogen atom, a trihalogeno-substituted C1-5 alkyl group or a nitro group, which comprises reacting a 6-substituted 2(1H)-quinoxalinone-N-oxide of the formula (II): CHEM wherein X is as defined above, with an alkali metal hydrosulfide and/or an alkali metal sulfide in the presence of from 1 to 20 mol times of an alkali.