反应详情

NMM (0.42 mL, 3.77 mmol) was added to a solution of 5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-N-hydroxy-4-methyl-1H-pyrazole-3-carboxamid amide (0.30 g, 0.75 mmol) obtained in Step 3, cyclohexylcarboxylic acid (97 mg, 0.75 mmol), HOBt (194 mg, 1.43 mmol) and EDCI (220 mg, 1.13 mmol) dissolved in DCM (7 mL). The mixture was stirred overnight at room temperature. After adding thereto EtOAc (30 mL), the mixture was successively washed with water, saturated NaHCO3 solution (20 mL) and brine (20 mL). The organic layer was isolated, dried over MgSO4, filtered, and concentrated under a vacuum, to obtain 5-(4-chlorophenyl)-N-(cyclohexanecarbonyloxy)-1-(2,4-dichlorophenyl)-4-methyl-1H-pyrazole-3-carboximidamide as a white solid, which was used in the next step without further purification. The crude material was dissolved in pyridine (4 mL), and was subjected to microwave irradiation at 180° C. for 20 min., to remove volatile components under a vacuum. The residue was further purified by reverse phase preparative HPLC, to obtain the title compound as white solid (67 mg, 0.137 mmol, 18% via two steps).

1. additionAfter adding
2. washEtOAc (30 mL), the mixture was successively washed with water, saturated NaHCO3 solution (20 mL) and brine (20 mL)
3. customThe organic layer was isolated
4. dry with materialdried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated under a vacuum