Hydrogen Bromide → alpha-Hydroxytriazolam

Participants

Reaction Steps

An amount of 72 ml of 48% aqueous hydrobromic acid is added to 20° to a solution of 9.7 g of 1-[ (p-methoxybenzyloxy)-methyl]-6-(o-chlorophenyl)-8-chloro-4H-s-triazolo[4,3-a][1,4]benzodiazepine in 90 ml of glacial acetic acid. The reaction mixture is stirred for 55 minutes; it is then neutralised with 30% sodium hydroxide solution and extracted with methylene chloride. The organic phase is separated, washed with water, dried over sodium sulphate and concentrated by evaporation. Crystallisation of the residue from ethyl acetate/petroleum ether yields 6-(o-chlorophenyl)-8-chloro-4 h-s-triazolo[4,3-a] [1,4]benzodiazepine-1-methanol, M.P. 235°-237°.

Provenance & Evidence