Patent ID: 7217824
Filing Date: 2007-05-15
Classification: C07D

Abstract:
1. A method of preparing a 4,7-bis(thien-2-yl)-2,1,3-benzothiadiazole comprising the step of reacting, in the presence of a palladium catalyst and a first solvent a) a 4,7-dihalo-2,1,3-benzothiadiazole with b) a thienyl group adding reagent selected from the group consisting of a 2-thienylzinc halide, a thienylmagnesium halide, a 2-thienyllithium and a 2-thiopheneboronic acid; under such conditions as to form a 4,7-bis(thien-2-yl)-2,1,3-benzothiadiazole, with the proviso that when the thienyl group adding reagent is a 2-thiopheneboronic acid, the reaction is carried out in the presence of a base.