反应详情

To a solution of 6-benzyloxy-benzofuran-2-carboxylic acid ethyl ester (8.1 g, 27 mmol) in EtOAc/EtOH (3/1, 130 mL) was added Pd/C (0.8 g). The reaction mixture was shaken in a Parr Shaker under H2 (50 psi, 12 h). The reaction mixture was filtered (Celite®), washed with EtOAC (400 mL) and EtOH (100 mL). The filtrate was concentrated and the resulting residue was purified by silica gel flash chromatography using EtOAc:hexanes (0-50%) to provide the title compound as colorless solid (3.9 g, 70%). MS (ESI): mass calcd. for C11H10O4, 206.1.0; m/z found, 207.1 [M+H]+. 1H NMR (400 MHz, CDCl3): 7.50 (d, J=8.6, 1H), 7.46 (d, J=0.8, 1H), 7.25-7.23 (m, 1H), 6.90 (dd, J=8.5, 2.2, 1H), 6.12 (s, 1H), 4.57-4.30 (m, 2H), 1.49-1.31 (m, 3H).

1. filtrationThe reaction mixture was filtered (Celite®)
2. washwashed with EtOAC (400 mL) and EtOH (100 mL)
3. concentrationThe filtrate was concentrated
4. customthe resulting residue was purified by silica gel flash chromatography