Water → 2-[2-[4-(2-Methoxyphenyl)-1-piperazinyl]ethyl]-6,7-dimethoxy-3,4-dihydro-1,2,4-benzothiadiazine-3-one 1,1-dioxide

Participants

Reaction Conditions

Reaction Steps

One gram and a half of 6,7-dimethoxy-3,4-dihydro-1,2,4-benzothiadiazine-3-one 1,1-dioxide was dissolved in 10 ml of dimethylformamide. After adding 280 mg of sodium hydride in 50% oil, the mixture was heated to 80° C. Then, a solution of 1.5 g of 2-[4-(2-methoxyphenyl)-1-piperazinyl]ethyl chloride in 5 ml of dimethylformamide was added dropwise to the resultant reaction liquid. After the addition was finished, the stirring was continued for 5 hours while heating at 80° C. to react. The resultant reaction mixture was poured into water to precipitate crystals. The produced crystals were filtered off followed by recrystallizing from methanol to obtain 1.0 g of the titled compound (yield: 36%).

Provenance & Evidence