Water → 2-(3-dimethylaminopropylthio)-5-(2-chlorophenyl)-7-chloro-3H-1,4-benzodiazepine

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Reaction Steps

To a solution of 6.4 g of 1,3-dihydro-5-(2-chlorophenyl)-7-chloro-2H-1,4-benzodiazepine-2-thione in 50 ml of anhydrous dimethylformamide is added under cooling with stirring 1,2 g of sodium hydride (50% oily suspension), and the resulting mixture is stirred at room temperature for 20 minutes. To the mixture is added dropwise 7.6 g of N,N-dimethyl-3-chloropropylamine and the mixture is stirred at room temperature for 1.5 hours. The reaction mixture is poured into iced water and extracted with ethyl acetate. The extract is washed with water and dried over magnesium sulfate and, thereafter, the solvent is distilled off under reduced pressure. An oily product obtained as the residue is subjected to column chromatography on alumina and eluted from the column with a benzenechloroform mixture. The eluate is treated according to usual procedure to obtain an oily 2-(3-dimethylaminopropylthio)-5-(2-chlorophenyl)-7-chloro-3H-1,4-benzodiazepine. The oily product thus obtained is treated, according to usual procedure, with fumaric acid and recrystallized from anhydrous ethanol and acetone to obtain 4.3 g of 2-(3-dimethylaminopropylthio)-5-(2-chlorophenyl)-7-chloro-3H-1,4-benzodiazepine fumarate, m.p. 154°- 156° C.

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