反应详情

To a solution of 2-bromo-4-(2,4-dichlorophenyl)-1,3-thiazole-5-carboximidamide (70 mg, 0.2 mmol) in DCM (4 mL) was added potassium carbonate (82.7 mg, 0.598 mmol) followed by solution of chloroacetone (50 uL, 0.6 mmol) in DCM (0.4 mL). The mixture was heated to reflux for 3 hours, at which time LCMS indicated ˜50% conversion. Additional cloroacetone (11 ul) and K2CO3 (19 mg) were added and heating was continued for additional 4 hours. LCMS showed complete conversion. Solvent was removed under reduced pressure and the residue was purified using ISCO chromatography, 20%-60% ethyl acetate in hexane to afford the title compound (56 mg, 70%). LCMS: (FA) ES+, 388, 390, 392. 1H NMR (400 MHz, d1-chloroform) δ: 7.60 (dd, J=5.37, 1.71 Hz, 1H), 7.45-7.40 (m, 3H), 2.23 (s, 3H).

1. temperatureThe mixture was heated
2. temperatureto reflux for 3 hours, at which time LCMS
3. temperatureheating
4. customSolvent was removed under reduced pressure
5. customthe residue was purified