反应详情

To a solution of (1R)-1-methyl-2-phenylcarbonyloxyethyl(2S)-2-[(tert-butoxy)carbonylamino]-3-[3,4-bis(phenylmethoxy)phenyl]propanoate (5) (2.6 g, 4.85 mmol) in 40 mL of tetrahydrafuran, 10% Pd—C (200 mg) pre-mixed with 10 mL of methanol was added under a nitrogen atmosphere. The nitrogen atmosphere was exchanged with hydrogen using the evacuation refill cycle method. The mixture was stirred under hydrogen at room temperature for 2 hours. After filtration and washing with methanol, the filtrate was concentrated and chromatographed (silica gel, 30% ethyl acetate in hexane) to afford 1.87 g (100% yield) of the title compound (1). MS (ESI) m/z 460.20 (M+H)+ and 458.17 (M−H)−.

1. additionwas added under a nitrogen atmosphere
2. filtrationAfter filtration
3. washwashing with methanol
4. concentrationthe filtrate was concentrated
5. customchromatographed (silica gel, 30% ethyl acetate in hexane)