Ammonia → 4-Chloro-2-[4-(4-chloro-phenyl)-piperazin-1-yl]-6,7-dihydro-thieno[3,2-d]pyrimidine 5-oxide

Participants

Reaction Conditions

Reaction Steps

14.69 g 4-chloro-2-[4-(4-chloro-phenyl)-piperazin-1-yl]-6,7-dihydro-thieno[3,2-d]pyrimidine are placed in 140 ml glacial acetic acid and cooled to 10° C. cooled. 3.79 ml hydrogen peroxide (35%) are added dropwise, then the mixture is stirred for 2 hours. A further 1 eq hydrogen peroxide is added, the mixture is stirred for 8 hours at ambient temperature. Then the reaction mixture is stirred into ice water, made basic with ammonia solution. The precipitate formed is suction filtered, washed with water and dried. 11.90 g of the product are obtained as a powder.

Provenance & Evidence