p-Toluenesulfonic acid monohydrate → 1-[2-(4-Chloro-2,5-difluorophenyl)thieno[3,2-d]pyrimidine-4-yl]piperidine-4-one hydrochloride

Participants

Reaction Steps

A mixture of 451 mg of 8-[2-(4-chloro-2,5-difluorophenyl)thieno[3,2-d]pyrimidine-4-yl]-1,4-dioxa-8-azaspiro[4.5]decane, 20 mg of p-toluenesulfonic acid monohydrate and 8 ml of acetonitrile-acetone (1:1) was stirred for 5 hours heated to reflux. The reaction mixture was allowed to cool to room temperature and was added to 200 ml of water. After the precipitate was filtered and washed with water, it was dried at 50° C. under reduced pressure. The obtained solid was dissolved in 12 ml of THF and added 2 ml of 4M HCl-dioxane solution. The resultant was concentrated under reduced pressure to give a solid. This solid washed with acetonitrile-ether to give 310 mg of 1-[2-(4-chloro-2,5-difluorophenyl)thieno[3,2-d]pyrimidine-4-yl]piperidine-4-one hydrochloride.

Provenance & Evidence