反应详情

To a stirred solution of 2-t-butyldimethylsilyl-3-(3,4,5-trimethoxy-benzoyl)-6-methoxy-benzofuran (30 mg, 0.066 mmol) in tetrahydrofuran (1 mL) was added tetrabutylammoniumfluoride (76.5 μL, 0.076 mmol, 1M solution in tetrahydrofuran). The reaction mixture was stirred at room temperature for 20 minutes (monitored by tlc), diluted with ethyl acetate (10 mL) and washed with 1M hydrochloric acid (5 mL). The organic layer was dried over magnesium sulfate and the solvent was removed under vacuum. The crude product was purified by flash chromatography (silica gel, eluent=hexane/diethyl ether; 7:3) to afford the title product as a cream crystalline solid (19.3 mg, 86%); 1H NMR (300 MHz, CDCl3) δ 8.02(d, 1H, J=8.97 Hz), 8.01(s, 1H, C2H), 7.14(s, 2H, benzoyl Hs), 7.05(d, 1H, J=2.11 Hz), 7.00(dd, 1H, J=8.63, 2.11 Hz), 3.93(s, 3H, OMe), 3.90(s, 6H, 2×OMe), 3.87(s, 3H, OMe); 13C NMR (75 MHz, CDCl3) δ 188.71(CO), 158.64, 156.31, 152.82, 150.22, 141.72, 133.97, 122.58, 120.87, 118.12, 113.11, 106.07, 95.53, 60.63, 55.99, 55.40.

1. washwashed with 1M hydrochloric acid (5 mL)
2. dry with materialThe organic layer was dried over magnesium sulfate
3. customthe solvent was removed under vacuum
4. customThe crude product was purified by flash chromatography (silica gel, eluent=hexane/diethyl ether; 7:3)