反应详情

To a solution of 4′-furan-3-yl-1′-methylspiro[furo[2,3-f][1,3]benzodioxole-7,3′-indol]-2′(1′H)-one (0.60 g, 1.66 mmol) in ethyl acetate (30 mL) was added palladium on carbon (10% w/w, 0.40 g). The reaction mixture was shaken under a pressure of hydrogen gas (60 psi) in a Parr hydrogenation apparatus at ambient temperature for 16 h and filtered through a pad of diatomaceous earth. The filtrate was concentrated in vacuo and the residue recrystallized from dichloromethane/diethyl ether to afford methyl-4′-(tetrahydrofuran-3-yl)spiro[furo[2,3-f][1,3]benzodioxole-7,3′-indol]-2′(1′H)-one (0.44 g, 73%) as a colorless solid: mp 182-184° C. (dichloromethane/ether); 1H NMR (300 MHz, CDCl3) δ 7.31-7.35 (m, 1H), 7.08-7.01 (m, 1H), 6.77 (d, J=7.7 Hz, 1H), 6.52-6.48 (m, 1H), 6.15 (d, J=13.3 Hz, 1H), 5.90-5.84 (m, 2H), 4.96 (dd, J=9.26, 1.0 Hz, 1H), 4.78-4.67 (m, 1H), 4.11-3.59 (m, 3H), 3.39-3.18 (m, 2H), 2.40-1.94 (m, 1H), 1.63-1.36 (m, 1H); MS (ES+) m/z 365.9 (M+1).

1. filtrationfiltered through a pad of diatomaceous earth
2. concentrationThe filtrate was concentrated in vacuo
3. customthe residue recrystallized from dichloromethane/diethyl ether