反应详情

温度

90 °C

To a stirred solution of 2-(7-Bromo-1,8-diethyl-1,3,4,9-tetrahydropyrano[3,4-b]indol-1-yl)acetic acid (0.87 g, 2.4 mmol) in THF (5 ml), was added dropwise via syringe borane-tetrahydrofuran complex, 1.0 M solution in tetrahydrofuran (3.6 ml, 3.6 mmol) during 30 min. The mixture was stirred at 90° C. for 8 hr, cooled, quenched with distilled water and 5% HCl, extracted with EtOAc. The organic phases collected, washed with brine, dried over MgSO4, and evaporated to give a residue which was chromatographed on silica gel. Elution with hexane-EtOAc (1:1) gave the product which was further recrystallized in hexane/dichloromethane to give the product (0.64 g, 76%). 1H NMR (300 MHz, CDCl3) δ 7.91 (b, NH), 7.28 (d, 1H), 7.20 (d, 1H), 4.02 (m, 2H), 3.71 (m, 2H), 2.95 (qrt, 1H), 2.81 (m, 1H), 2.75 (t, 1H), 2.69 (t, 1H), 2.58 (t, 1H), 2.19 (m, 1H), 2.04 (m, 2H), 1.26(t, 3H), 0.93 (t, 3H).

1. temperaturecooled
2. customquenched with distilled water and 5% HCl
3. extractionextracted with EtOAc
4. customThe organic phases collected
5. washwashed with brine
6. dry with materialdried over MgSO4
7. customevaporated
8. customto give a residue which
9. customwas chromatographed on silica gel
10. washElution with hexane-EtOAc (1:1)
11. customgave the product which
12. customwas further recrystallized in hexane/dichloromethane