反应详情

A solution of Example 244A (275 mg, 0.84 mmol) in DMF at 0° C. was treated with 60% NaH in mineral oil (40 mg, 1.03 mmol). After the gas evolution subsided, the reaction mixture was allowed to stir for 30 min and then treated with commercially available 3-(chloromethyl)-5-methylisoxazole (111 mg, 0.847 mmol). The resulting mixture was stirred at room temperature for 18 hr, poured into brine and extracted with EtOAc. The organics were combined and washed with water and brine, dried over MgSO4, filtered, and concentrated. The residue was purified by flash chromatography over silica gel using 20% EtOAc in hexane to afford the title compound (165 mg, 37% yield). 1H NMR (500 MHz, DMSO-d6) δ ppm 1.32 (s, 9H), 2.38 (s, 3H), 3.77 (s, 3H), 5.39 (s, 2H), 6.23 (s, 1H), 7.10 (d, J=8.8 Hz, 1H), 7.39 (s, 1H), 7.45 (dd, J=9.0, 2.9 Hz, 1H), 7.65 (d, J=3.1 Hz, 1H). MS (DCI) m/z 420 (M+H)+. Elemental analysis calculated for C20H22ClN3O3S: C, 57.20; H, 5.28; N, 10.01. Found: C, 57.16; H, 5.42; N, 9.75.

1. stirringThe resulting mixture was stirred at room temperature for 18 hr
2. extractionextracted with EtOAc
3. washwashed with water and brine
4. dry with materialdried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated
7. customThe residue was purified by flash chromatography over silica gel using 20% EtOAc in hexane