反应详情

A suspension of 3a (12.57 g, 51.88 mmol) in a mixture of MeOH (50 ml) and THF (200 ml) was hydrogenated at 50 psi in the presence of 10% Pd/C (0.3 g) for 4 h. The catalyst was removed by filtration through Celite and the filtrate was concentrated to afford 12.6 g (51.5 mmol, 99% yield) of analytically pure (HPLC, 1H NMR) 4a as a white solid. 1H NMR (DMSO-d6): δ 7.15 (d, J=8.6 Hz, 1H), 6.86 (d, J=8.6 Hz, 1H), 3.81 (s, 3H), 3.75 (s, 3H), 2.78 (t, J=7.5 Hz, 2H), 2.49 (t, J=7.5 Hz, 2H).

1. customThe catalyst was removed by filtration through Celite
2. concentrationthe filtrate was concentrated