Water → Benzyl (2-oxo-5-phenyl-2,3-dihydro-1h-benzo[e][1,4]diazepin-3-yl)carbamate

関与物質

反応手順

A suspension of (±) 3-[N-carbobenzyloxy]amino-2,3-dihydro-1-[4-methoxybenzyl]-2-oxo-5-phenyl-1H-1,4-benzodiazepine (0.58 g, 1.15 mmol, from step 5 of Example 1) in a mixture of acetonitrile (3.3 mL), water (1.2 mL) and ammonium cerium(IV) nitrate (3.1 g) was vortexed vigorously for 5 minutes. The resultant clear orange solution was stirred at room temperature for 20 minutes and add dropwisely into a mixture of saturated sodium potassium tartrate solution (40 mL), water (27 mL), and ethyl acetate (190 mL). The resultant mixture was stirred at room temperature for 1.5 hour, and the organic extract was washed with brine, dried over anhydrous magnesium sulfate, filtered and concentrated under vacuo. The residue was subjected to column chromatography on silica gel eluting with 2% methanol in chloroform. Collection and concentration of appropriate fraction provided the title compound.

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