反应详情

(S)-Benzyl 2-((2R,6R)-2,6-dimethyltetrahydro-2H-pyran-4-yl)-2-(methoxycarbonylamino)acetate (Cap-2, step e) (56 mg, 0.167 mmol) was dissolved in MeOH (4 mL) and then treated with 10% Pd/C (12 mg, 0.012 mmol). The reaction mixture was vacuum flushed with nitrogen (4×) and then with hydrogen (4×) and stirred under a balloon of hydrogen overnight. The reaction was filtered through Celite® and concentrated to yield (S)-2-((2R,6R)-2,6-dimethyltetrahydro-2H-pyran-4-yl)-2-(methoxycarbonylamino)acetic acid (Cap-2) (41 mg) as a colorless oil. 1H NMR (400 MHz, D4-MeOH) δ ppm 4.22 (quin, J=6.4 Hz, 1H), 4.04-4.11 (m, 1H), 3.78-3.87 (m, 1H), 3.66 (s, 3H), 2.26-2.39 (m, 1H), 1.63 (d, J=13.1 Hz, 1H), 1.51-1.60 (m, 1H), 1.42-1.49 (m, 1H), 1.27 (d, J=7.0 Hz, 3H), 1.11 (d, J=6.3 Hz, 3H), 0.97-1.08 (m, 1H).

1. customflushed with nitrogen (4×)
2. filtrationThe reaction was filtered through Celite®
3. concentrationconcentrated