Synthesis of 7-arylimidazo[1,2-a]pyrazin-8(7H)-one derivatives

A suitable approach to the synthesis of 7-arylimidazo[1,2-a]pyrazin-8(7H)-ones starting from esters of oxalic acid monoamides via cyclization of intermediate 3-aminopyrazin-2-ones with -halocarbonyl compounds has been suggested.