反应详情

To a solution of the product of Example 126A (0.20 g, 1.1 mmol) and Et3N (0.45 mL, 3.2 mmol) in 30 mL THF was added 2,2-dimethyl-2,3-dihydro-1-benzofuran-7-carbonyl chloride (Acros, 0.34 g, 1.6 mmol). This mixture was warmed to reflux and allowed to stir for 2 hours. The mixture was then cooled to ambient temperature and concentrated under reduced pressure. The residue was diluted with 10 mL EtOAc and washed with 5 mL saturated, aqueous NH4Cl. The layers were separated and the aqueous layer was extracted 2×5 mL EtOAc. The combined organics were dried over anhydrous Na2SO4, filtered, concentrated under reduced pressure and purified via flash column chromatography (SiO2, 4:1 hexanes:EtOAc) to provide the title compound (0.21 mmol, 0.57 mmol, 53% yield). 1H NMR (300 MHz, CDCl3) δ ppm 1.55 (s, 6H), 2.22 (s, 3H), 2.27 (s, 3H), 3.02 (s, 2H), 3.31 (s, 3H), 3.77-3.89 (m, 2H), 4.33-4.50 (m, 2H), 6.85 (t, J=7.5 Hz, 1H), 7.22 (d, J=7.5 Hz, 1H), 8.00 (d, J=8.1 Hz, 1H); MS (DCI/NH3) m/z 361 (M+H)+; Anal. calculated for C19H24N2O3S: C, 63.31; H, 6.71; N, 7.77. Found: C, 63.19; H, 6.50; N, 7.66.

1. temperatureThis mixture was warmed
2. temperatureto reflux
3. concentrationconcentrated under reduced pressure
4. additionThe residue was diluted with 10 mL EtOAc
5. washwashed with 5 mL saturated
6. customThe layers were separated
7. extractionthe aqueous layer was extracted 2×5 mL EtOAc
8. dry with materialThe combined organics were dried over anhydrous Na2SO4
9. filtrationfiltered
10. concentrationconcentrated under reduced pressure
11. custompurified via flash column chromatography (SiO2, 4:1 hexanes:EtOAc)