反应详情

4-Oxo-4,5-dihydroimidazo[1,5-a]quinoxaline 3-carboxylic acid ethyl ester (3.5 g) was dissolved in 100 ml of 0.5 N sodium hydroxide solution. The solution was heated on steam bath for one hour, cooled to room temperature, then acidified by concentrated hydrochloric acid (5 ml). The product precipitated out as a white solid (3.0 g, 95% yield), m.p. >300° C.

1. temperatureThe solution was heated on steam bath for one hour