反应详情

温度

80 °C

To a solution of ethyl 5-phenyl-1,2,4-thiadiazole-3-carboxylate (Example 7A, 230 mg, 0.982 mmol) in anhydrous ethanol (3 mL, 51.4 mmol) was added NaBH4 (149 mg, 3.93 mmol) at 0° C. The reaction mixture was heated to 80° C. for 30 min, then HCl 1N (1 mL) was added and ethanol was evaporated. Dichloromethane was added to the reaction followed by brine and this was extracted with dichloromethane (3×). The organic layers were dried over anhydrous magnesium sulfate and concentrated. The residue was purified on silica gel column chromatography (100% CH2Cl2 up to 10% EtOAc/CH2Cl2) to provide the title material (25 mgs, 13%). LC (Method B): 1.858 min. LCMS (APCI) calcd for C9H9N2OS [M+H]+ m/z 193.04. found 193.0. 1H NMR (CDCl3, 400 MHz) δ ppm: 7.89-8.03 (m, 2H), 7.46-7.62 (m, 3H), 4.99 (d, J=5.87 Hz, 2H), 2.81 (t, J=6.06 Hz, 1H)

1. customethanol was evaporated
2. additionDichloromethane was added to the reaction
3. extractionthis was extracted with dichloromethane (3×)
4. dry with materialThe organic layers were dried over anhydrous magnesium sulfate
5. concentrationconcentrated
6. customThe residue was purified on silica gel column chromatography (100% CH2Cl2 up to 10% EtOAc/CH2Cl2)