反应详情

The thiobenzoic acid S-[2-(2,5-dimethyl-2H-pyrazol-3-ylcarbamoyl)-phenyl]ester (as prepared in step 2 above; 0.966 g, 2.75 mmol) was dissolved in THF (50 mL) and MeOH (100 mL). Under N2(g), a 0.2M solution of NaOH (80 mL) was added and the mixture was stirred for 1.5 h at rt. A saturated solution of NaHCO3(aq) (100 mL) was added and the aqueous layer was extracted with CHCl3 (3×100 mL). The combined organic layers were dried over Na2SO4, filtered and evaporated in vacuo. The crude mixture was then purified over silica (5% MeOH/CHCl3) to give the title compound in 67% yield (0.455 g, 1.84 mmol).

1. extractionthe aqueous layer was extracted with CHCl3 (3×100 mL)
2. dry with materialThe combined organic layers were dried over Na2SO4
3. filtrationfiltered
4. customevaporated in vacuo
5. customThe crude mixture was then purified over silica (5% MeOH/CHCl3)