Hydrochloric Acid → (S)-11,12,13,13a-tetrahydro-1-(hydroxymethyl)-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]benzodiazepin-9-one

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A solution of 46.7 g (150 mmol) of ethyl (S)-11,12,13,13a-tetrahydro-9-oxo-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]benzodiazepine-1-carboxylate in 300 ml of dry tetrahydrofuran is treated dropwise at ca 35° C. with a solution of 8.3 g (377 mmol) of lithium borohydride in 110 ml of dry tetrahydrofuran. The mixture is heated to boiling under reflux for ca 40 hours, cooled to room temperature, treated with 110 ml of 12 percent hydrochloric acid and 20 ml of concentrated hydrochloric acid and again heated to boiling under reflux for 2 hours. After removal of the tetrahydrofuran in vacuo, the residue is made alkaline with concentrated ammonia. The separated material is filtered off under suction and washed with water. After recrystallisation from ethanol, there is obtained (S)-11,12,13,13a-tetrahydro-1-(hydroxymethyl)-9H-imidazo[1,5-a]pyrrolo[2,1-c][1,4]benzodiazepin-9-one of melting point 212°-214° C.

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