Patent ID: 6288232
Filing Date: 2001-09-11
Classification: C07D,C09B

Abstract:
A method for preparing a compound of formula I ##STR10##wherein Ar.sub.1 and Ar.sub.2 are each independently selected from the group consisting of an unsubstituted phenyl radical, a phenyl radical substituted at the para position with an alkoxy group, an acyloxy group, an alkylamino group or an acylamino group, a naphthyl radical and a polynuclear aromatic radical; and Ar.sub.3 is selected from the group consisting of ##STR11##wherein X and Y are each independently selected from the group consisting of hydrogen, an alkoxy group, an acyloxy group, an alkylamino group and an acylamino group;said method comprising the steps of:(a) reacting 4-acetylnaphthalic anhydride (II) ##STR12##with an aldehyde of formula III ##STR13##in the presence of an aqueous base to form a compound of formula IV: ##STR14##(b) boiling the compound of formula IV in the presence of either a compound of formula V: ##STR15##or a compound of formula VI: ##STR16##to form a compound of formula VII: ##STR17##(c) boiling the compound of formula VII in the presence of a compound of formula VIII: ##STR18##in the presence of ethanol in a 10% alkali solution.