反应详情

To a suspension of 2-(4′-nitrophenyl)-6-methoxy benzothiazole (400 mg, 1.5 mmol) in CH2Cl2 (10 mL) was added BBr3 (1M in CH2Cl2, 10 mL, 10 mmol). The reaction mixture was stirred at room temperature for 24 hr. The reaction was then quenched with water, and extracted with ethyl acetate (3×20 mL). The organic layers were combined and washed with water, dried over MgSO4, and evaporated. The residue was purified by flash chromatography (silica gel, hexanes:ethyl acetate=1:1) to give the product as a yellow solid (210 mg, 55%). 1HNMR (300 MHz, Acetone-d6) δ (ppm): 9.02(s, OH), 8.41(d, J=9.1 Hz, 1H), 8.33(d, J=9.1 Hz, 1H), 7.96(d, J=8.6 Hz, 1H), 7.53(d, J=2.4 Hz, 1H), 7.15(dd, J1=8.6 Hz, J2=2.4 Hz, 1H).

1. customThe reaction was then quenched with water
2. extractionextracted with ethyl acetate (3×20 mL)
3. washwashed with water
4. dry with materialdried over MgSO4
5. customevaporated
6. customThe residue was purified by flash chromatography (silica gel, hexanes:ethyl acetate=1:1)