反应详情

7.0 g (16 mmole) of fluvastatin sodium was dissolved in 300 mL ethyl acetate and washed with 300 mL 10% (w/v) aqueous sodium hydrogen sulfate solution (pH 3). The organic phase was dried over anhydrous magnesium sulfate, filtered and the solvent removed under reduced pressure to afford 5.76 g (14.0 mmole) of fluvastatin acid. This material was dissolved in 300 mL anhydrous toluene and stirred at room temperature for 7 days, at which time analytical thin-layer chromatography using 5:1 methylene chloride:acetone eluent indicated approximately 30% conversion of the starting acid to a less polar product. The toluene was removed under reduced pressure and the reaction mixture was fractionated on 400 cc of silica gel using 5:1 methylene chloride: acetone eluent to afford, after combining, concentrating and drying of the appropriate fractions, 2.02 g (5.14 mmol, 32% overall) of fluvastatin lactone as a white foam. The 400 MHz 1H nuclear magnetic resonance (NMR) spectrum and the electrospray mass spectrum (ES-MS) were consistent with the lactone product. 1H NMR (Me2SO-d6) δ 7.7 (d, 1H), 7.4 (br s, 3H), 7.3 (m, 2H), 7.2 (t, 1H), 7.1 (t, 1H), 6.8 (t, 1H), 5.7 (dd, 1H), 5.3 (s, 1H), 5.2 (m, 1H), 4.9 (m, 1H), 4.1 (br s, 1H), 2.7 (dd, 1H), 2.4 (d, 1H), 1.8 (d, 1H), 1.7 (t, 1H), 1.57 (d, 6H). ES-MS: obsvd. m/z 394 ([MH]+).

1. washwashed with 300 mL 10% (w/v) aqueous sodium hydrogen sulfate solution (pH 3)
2. dry with materialThe organic phase was dried over anhydrous magnesium sulfate
3. filtrationfiltered
4. customthe solvent removed under reduced pressure