反应详情

To a suspension of 60% NaH (10.1 mg, 0.254 mmol) in DMF (1 mL), 6-bromobenzo[d]isothiazol-3(2H)-one 1,1-dioxide (55.4 mg, 0.212 mmol) was added portionwise at 0° C. The resulting mixture was stirred at rt for 15 min and p-methoxy benzyl chloride (27.6 μL, 0.212 mmol) was added dropwise. The reaction mixture was heated to 70° C. overnight, allowed to cool to rt, and treated with water (20 mL). The aqueous layer was extracted with EtOAc (3×50 mL) and the combined organic layers were dried over Na2SO4, filtered, and concentrated. The resulting solid was recrystallized from hexane/DCM to obtain compound 38a. 1H-NMR (400 MHz, CDCl3) δ (ppm): 8.08 (d, J=1.5 Hz, 1H), 7.89 (dd, J=8.2, 1.6 Hz, 1H), 7.69 (d, J=8.3 Hz, 1H), 7.35 (d, J=8.6 Hz, 2H), 6.79 (d, J=8.6 Hz, 2H), 4.76 (s, 2H), 3.71 (s, 3H).

1. additionwas added portionwise at 0° C
2. temperatureThe reaction mixture was heated to 70° C. overnight
3. temperatureto cool to rt
4. extractionThe aqueous layer was extracted with EtOAc (3×50 mL)
5. dry with materialthe combined organic layers were dried over Na2SO4
6. filtrationfiltered
7. concentrationconcentrated
8. customThe resulting solid was recrystallized from hexane/DCM