反应详情

To 1 mL of 20% HNO3 was added 28 mg of HNO2. This mixture was then added to 3-[2-mercapto-4-(5-methyl-1-phenyl-1H-pyrazol-4-yl)-imidazol-1-yl]-4-methyl-benzoic acid methyl ester (280 mg; 0.69 mmol) suspended in 5 mL of rapidly stirring HOAc over 15 min. After stirring an additional 5 min, the solution was poured into ice-cold water. The pH was adjusted to about 7 with NaHCO3, and the mixture was extracted with EtOAc. The extract was washed once with brine, dried with Na2SO4, filtered, and concentrated. The resulting residue was chromatographed (5-60% EtOAc in hexanes) to provide 210 mg (0.56 mmol; 82%) of 4-methyl-3-[4-(5-methyl-1-phenyl-1H-pyrazol-4-yl)-imidazol-1-yl]-benzoic acid methyl ester. ESI MS m/z 373 [C22H20N4O2+H]+.

1. additionthe solution was poured into ice-cold water
2. extractionthe mixture was extracted with EtOAc
3. washThe extract was washed once with brine
4. dry with materialdried with Na2SO4
5. filtrationfiltered
6. concentrationconcentrated
7. customThe resulting residue was chromatographed (5-60% EtOAc in hexanes)