Methanol → 2-(2-perhydroazepin-1-ylethylthio)-5-(2-chlorophenyl)-7-chloro-3H-1,4-benzodiazepine

Participants

Reaction Steps

To a solution of 7.5 g of 1,3-dihydro-5-(2-chlorophenyl)-7-chloro-2H-1,4-benzodiazepine-2-thione in a solvent mixture comprising 30 ml of a 10% aqueous sodium hydroxide solution and 30 ml of methanol is added dropwise under ice cooling with stirring an aqueous solution of 7.0 g of 1-chloro-2-(perhydroazepin-1-yl)ethane hydrochloride over a period of about 10 minutes, and the resulting mixture is stirred at room temperature for 4 hours. The reaction mixture is diluted with water and extracted with ethyl acetate. The extract is rinsed with a 5% aqueous sodium hydroxide solution, washed with water and dried. Thereafter the solvent is distilled off to obtain an oily residue of 2-(2-perhydroazepin-1-ylethylthio)-5-(2-chlorophenyl)-7-chloro-3H-1,4-benzodiazepine. The oily product thus obtained is treated, according to usual procedure, with 2.74 g of fumaric acid and recrystallized from isopropyl alcohol to obtain 9.9 g of 2-(2-perhydroazepin-1-ylethylthio)-5-(2-chlorophenyl)-7 -chloro-3H-1,4-benzodiazepine fumarate, m.p. 170°-171° C.

Provenance & Evidence