反应详情

A 25 mL scintillation vial was charged with 1-[3-(4-tert-butyl-benzenesulfonylamino)-5-chloro-pyridin-2-yl]-1H-pyrazole-4-carboxylic acid (87 mg, 0.2 mmol), oxalyl chloride (2 mL, 1.0 M solution in dichloromethane), and dichloromethane (3 mL). The mixture was stirred at room temperature for 2 hours, the volatiles removed in vacuo, and the residue further dried at reduced pressure for 4 hours. The scintillation vial containing the crude acid chloride was subsequently charged with 1H-1,2,3-triazole (34 mg, 0.5 mmol), K2CO3 (138 mg, 1.0 mmol), and sulfolane (2 mL). The vial was sealed and stirred at 80° C. for 16 hours. The reaction solution was neutralized to pH=7 with glacial acetic acid. The mixture was extracted with ethyl acetate (2×10 mL) and the combined organics were concentrated in vacuo. The residue was purified via preparative HPLC to afford 4-tert-butyl-N-[5-chloro-2-(4-oxazol-2-yl-pyrazol-1-yl)-pyridin-3-yl]-benzenesulfonamide as a white powder: MS (ES) M+H expected 458.1, found 458.0.

1. customthe volatiles removed in vacuo
2. customthe residue further dried at reduced pressure for 4 hours
3. additionThe scintillation vial containing the crude acid chloride
4. customThe vial was sealed
5. stirringstirred at 80° C. for 16 hours
6. extractionThe mixture was extracted with ethyl acetate (2×10 mL)
7. concentrationthe combined organics were concentrated in vacuo
8. customThe residue was purified via preparative HPLC