(+)-1-tert-Butylcarbonylmethyl-2-oxo-3-[(2S)-[2-(N-phenylthioureido)-3-phenylpropionyl]amino]-5-phenyl-8-methyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepine → 1-tert-butylcarbonylmethyl-2-oxo-3-amino-5-phenyl-8-methyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepine

Participants

Reaction Conditions

Reaction Steps

(−)-1-tert-Butylcarbonylmethyl-2-oxo-3-[(2S)-[2-(N-phenylthioureido)-3-phenylpropionyl]amino]-5-phenyl-8-methyl-1,3,4,5-tetrahydro-2H-1,5-benzodiazepine (2.50 g) was dissolved in trifluoroacetic acid (30 ml), the solution was stirred at 50° C. for one hour. The reaction mixture was concentrated under reduced pressure, the residue was dissolved in methanol (50 ml), concentrated hydrochloric acid (20 ml) was added, and refluxed for one hour. The resultant mixture was concentrated under reduced pressure, neutralized with saturated aqueous sodium bicarbonate, and extracted with methylene chloride. The organic layer was dried over anhydrous sodium sulfate, the solvent was evaporated under reduced pressure, and the residue was purified by silica gel column chromatography(chloroform:ethyl acetate=20:1), to thereby obtain 1.40 g of the titled compound.

Provenance & Evidence