反应详情

A mixture of Example 238A (0.40 g, 1.2 mmol), 1-bromobutane (0.16 mL, 1.5 mmol), and potassium t-butoxide (0.22 g, 1.9 mmol) in 5 mL N,N-dimethylformamide was warmed to 65° C. and stirred for 20 hours. The mixture was cooled to ambient temperature quenched with 5 mL of saturated aqueous NH4Cl and diluted with 5 mL of ethyl acetate. The layers were separated and the aqueous phase was extracted twice with 5 mL of ethyl acetate. The combined organic extracts were dried over anhydrous Na2SO4, filtered and concentrated under reduced pressure. Purification via column chromatography (SiO2, 40% hexanes in ethyl acetate) afforded the title compound. 1H NMR (300 MHz, CD3OD) δ ppm 1.04 (t, J=7.3 Hz, 3H), 1.42-1.55 (m, 2H), 1.77-1.90 (m, 2H), 2.51 (s, 3H), 2.76 (s, 3H), 3.889 (s, 3H), 4.32-4.41 (m, 2H), 7.10 (d, J=8.8 Hz, 1H), 7.45 (dd, J=8.8, 2.7 Hz, 1H), 7.99 (d, J=3.1 Hz, 1H); MS (DCI/NH3) m/z 381 (M+H)+. Anal. Calculated for C18H21ClN2O3S: C, 56.76; H, 5.56, N, 7.35. Found: C, 56.68; H, 5.49; N, 7.26.

1. customquenched with 5 mL of saturated aqueous NH4Cl
2. additiondiluted with 5 mL of ethyl acetate
3. customThe layers were separated
4. extractionthe aqueous phase was extracted twice with 5 mL of ethyl acetate
5. dry with materialThe combined organic extracts were dried over anhydrous Na2SO4
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. customPurification via column chromatography (SiO2, 40% hexanes in ethyl acetate)