Method for producing bisbenzoxazoles

Details Method for producing bisbenzoxazoles Method for producing bisbenzoxazoles

C - Chemistry, Metallurgy

07

D

C07D 263/62 (2006.01) C07D 263/64 (2006.01)

Patent

CA 2666174

The invention relates to a method for producing bisbenzoxazoles that are interconnected by means of a system of conjugated double bonds, according to which o-aminophenols are reacted with dicarboxylic acids, the carboxyl groups of which are interconnected via a double bond or a system of conjugated double bonds, to form an ammonium salt, said ammonium salt being converted in the presence of dehydrogenating catalysts and solvents with a low dielectric loss into benzoxazol by means of microwave radiation.

La présente invention concerne un procédé de production de bisbenzoxazoles liés les uns autres par un système de doubles liaisons conjuguées. Ce procédé consiste à faire réagir des o-aminophénols avec des acides dicarboxyliques dont les groupes carboxyle sont liés les uns aux autres par une double liaison ou par un système de doubles liaisons conjuguées, de manière à obtenir un sel d'ammonium, puis à transformer ce sel d'ammonium en benzoxazol par exposition à des micro-ondes, en présence de catalyseurs déshydratants et de solvants à faible perte diélectrique.

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