反应详情

A solution of ethyl 3-(1-ethyl-1,3,4,9-tetrahydro-1-(2-hydroxyethyl)-8-isopropylpyrano[3,4-b]indol-6-yl)propanoate (0.18 g, 0.46 mmol) in anhydrous diethyl ether (15 ml) was stirred at room temperature under a nitrogen atmosphere. LiAlH4 (0.09 g, 2.4 mmol) was slowly added to the solution. The mixture was stirred for 18 hr, quenched with water and 5% HCl, extracted with EtOAc, dried over MgSO4, and concentrated under reduced pressure. The crude product was purified by silica gel flash column chromatography hexane/EtOAc (4:6) twice to give (31 mg) of the product (0.031 g, 20%). 1H NMR (300 MHz, CDCl3) δ 7.70 (br, NH), 7.18 (d, 1H), 6.91 (d, 1H), 4.03 (m, 2H), 3.73 (m, 4H), 3.17 (m, 1H), 2.80 (m, 6H), 2.18 (m, 1H), 1.98 (m, 3H), 1.37 (d, 6H), 1.26 (br, 1H), 0.94 (t, 3H); ESI (+) MS m/e=346 (MH+), ESI (−) MS m/e=344 (MH−).

1. customquenched with water and 5% HCl
2. extractionextracted with EtOAc
3. dry with materialdried over MgSO4
4. concentrationconcentrated under reduced pressure
5. customThe crude product was purified by silica gel flash column chromatography hexane/EtOAc (4:6) twice