Hydrochloric Acid → (R)-1-tert-butylcarbonylmethyl-2-oxo-3-amino-5-cyclohexyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepine

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Reaktionsschritte

To a solution of 63.5 g of (R)-1-tert-butylcarbonylmethyl-2-oxo-3-tert-butoxycarbonylamino-5-cyclohexyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepine in 100 ml of ethanol was added 100 ml of 6N hydrochloric acid. The mixture was stirred at 60° C. for 1.5 hours. After the reaction mixture was cooled to room temperature, a mixed solvent of water and diethyl ether (1:1) was added. The aqueous layer was separated, neutralized with a 6N aqueous solution of sodium hydroxide, and then extracted with ethyl acetate. The extract was washed with brine, dried over anhydrous sodium sulfate and evaporated under reduced pressure, whereby 46.3 g of (R)-(−)-1-tert-butylcarbonylmethyl-2-oxo-3-amino-5-cyclohexyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepine was obtained.

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