反应详情

A mixture of 22.52 g (47.05 mmol) (S)-3-(2-benzyloxy-benzenesulfonylamino)-N-methoxy-N-methyl-succinamic acid tert-butyl ester, 1 g 20% Pd on charcoal, 250 mL tetrahydrofuran and 250 mL ethanol was shaken under a 50 psig. hydrogen atmosphere for 26 h. The mixture was filtered through a pad of celite and concentrated. The residue was passed through a 100 g plug of silica eluting with 6:4 ethyl acetate:hexanes to give 17.5 g (45.05 mmol, 95.7%) of (S)-3-(2-hydroxy-benzenesulfonylamino)-N-methoxy-N-methyl-succinamic acid tert-butyl ester as a thick colorless oil. MS (APCI) m/z 387.0 (M−1).

1. filtrationThe mixture was filtered through a pad of celite
2. concentrationconcentrated