Hydrochloric Acid → HCID 136161598, compound

Participants

Reaction Steps

30% Aqueous hydrogen peroxide solution (0.5 ml) was added to a stirred aqueous sodium hydroxide solution (1M, 40 ml), followed by 8-cyano-2-(2-ethoxyphenyl)pyrido[3,2-d]pyrimidin-4(3H)-one (Preparation 14; 0.2 g, 0.00068 mol) and ethanol (2 ml). The mixture was heated under reflux for 2 hours, allowed to cool, acidified with 1N hydrochloric acid, and then extracted with a mixture of dichloromethane and methanol (10:1, 5×50 ml). The combined organic fractions were evaporated under vacuum and the resulting residue triturated with ethanol to give the title compound as a colourless solid (0.152 g, 72%), m.p. 295-297° C.

Provenance & Evidence