反应详情

To a solution of 2-(cyclopent-3-enyloxy)isoindoline-1,3-dione (736 mg, 3.2 mmol) in dioxane —H2O (5.0 mL, 4:1) was added NMO (421 mg, 3.60 mmol) and OsO4 (1.0 mL mg, 0.32 mmol, 2.5 wt % in H2O) and the reaction mixture was stirred for 24 h at rt. Quenched with 10% aqueous Na2S2O3 solution and extracted with ethyl acetate. The combined organic layers washed with brine and dried over anhydrous Na2SO4. Filtered and concentrated to provide yellow oil, which was purified by flash chromatography (80% EtOAc-hexane) to yield 2-((3R,4S)-3,4-dihydroxycyclopentyloxy)isoindoline-1,3-dione (650 mg, 77%) as light yellow oil. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 1.94-2.12 (m, 2H) 2.14-2.35 (m, 2H) 4.22-4.88 (m, 2H) 4.75-5.11 (m, 1H) 7.67-7.78 (m, 2H) 7.79-7.86 (m, 2H). MS (ES) [M+H] calculated for C13H14NO5, 264.08. found 264.20.

1. customQuenched with 10% aqueous Na2S2O3 solution
2. extractionextracted with ethyl acetate
3. washThe combined organic layers washed with brine
4. dry with materialdried over anhydrous Na2SO4
5. filtrationFiltered
6. concentrationconcentrated
7. customto provide yellow oil, which
8. customwas purified by flash chromatography (80% EtOAc-hexane)