反应详情

温度

-78 °C

A solution of methyllithium (Aldrich, 1.6 M in diethyl ether, 0.41 mL, 0.66 mmol) was added slowly a solution of Example 253 (0.14 g, 0.33 mmol) in tetrahydrofuran (3 mL) at −78° C. The reaction mixture was stirred at −78° C. for 30 minutes and was allowed to reach room temperature. The reaction mixture was quenched with water (6 mL) and extracted with ethyl acetate (2×10 mL). The combined organic extracts were dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure. The residue was purified by column chromatography using an Analogix® Intelliflash280™ (SiO2, 0-5% methanol in CH2Cl2) to afford the title compound. 1H NMR (300 MHz, dimethylsulfoxide-d6) δ ppm 1.21-1.36 (m, 1H), 1.41-1.48 (m, 3H), 1.49 (s, 3H), 1.50 (s, 3H), 1.57-1.67 (m, 1H), 1.74-1.85 (m, 1H), 2.42 (s, 3H), 3.68-3.89 (m, 3H), 3.79 (s, 3H), 3.92-4.09 (m, 1H), 4.17-4.38 (m, 1H), 5.60 (s, 1H), 7.10 (d, J=8.8 Hz, 1H), 7.44 (dd, J=8.8, 2.7 Hz, 1H), 7.68 (d, J=2.7 Hz, 1H); MS (ESI+) m/z 439 (M+H)−; Anal. Calculated for C21H27ClN2O4S: C, 57.46; H, 6.20; N, 6.38. Found: C, 57.44; H, 5.88; N, 6.06.

1. customto reach room temperature
2. customThe reaction mixture was quenched with water (6 mL)
3. extractionextracted with ethyl acetate (2×10 mL)
4. dry with materialThe combined organic extracts were dried over anhydrous Na2SO4
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified by column chromatography