反应详情

To a suspension of (E)-ethyl 3-(1-ethyl-1,3,4,9-tetrahydro-1-(2-hydroxyethyl)-8-isopropylpyrano[3,4-b]indol-6-yl)acrylate (0.8 g, 2.3 mmol) in 2% HCl in EtOH (80 ml) was added palladium on carbon (10%, 0.5 g). The mixture was stirred under an atmosphere of hydrogen (1 am) at room temperature for 24 hr. The catalyst filtered through celite. The filtrate was evaporated at reduced pressure. The residue was neutralized with sat. NaHCO3, extracted with EtOAc, and dried over MgSO4. The solvent was concentrated under reduced pressure and purified by silica gel flash column chromatography hexane/EtOAc (6:4) to give the product (0.33 g, 38%). 1H NMR (300 MHz, CDCl3) δ 7.72 (br, NH), 7.18 (d, 1H), 6.91 (d, 1H), 4.15 (qrt, 2H), 4.02 (m, 2H), 3.70 (m, 2H), 3.17 (m, 1H), 3.04 (t, 2H), 2.83 (m, 1H), 2.68 (m, 3H), 2.18 (m, 1H), 2.05 (m, 1H), 1.96 (m, 2H), 1.36 (d, 6H), 1.26 (t, 3H), 0.94 (t, 3H); ESI (+) MS m/e=388 (MH+), ESI (−) MS m/e=386 (MH−).

1. filtrationThe catalyst filtered through celite
2. customThe filtrate was evaporated at reduced pressure
3. extractionextracted with EtOAc
4. dry with materialdried over MgSO4
5. concentrationThe solvent was concentrated under reduced pressure
6. custompurified by silica gel flash column chromatography hexane/EtOAc (6:4)