反应详情

A solution of cyclopropanecarboxylic acid [3-(5-ethoxy-6-ethyl-1H-benzoimidazol-2-yl)-1-(tetrahydropyran-2-yl)-1H-pyrazol-4-yl]amide [0.3 g, Reference Example 48(a)] and p-toluenesulfonic acid hydrate (1.2 g) in ethanol (25 mL) was heated in an 80° C. in an oil bath for 1 hour, then cooled, and then poured into aqueous sodium bicarbonate solution. The aqueous mixture was extracted twice with ethyl acetate (75 mL). The combined extracts were evaporated and the residue was redissolved in a mixture of methylene chloride (100 mL) and methanol (10 mL). This solution was washed with aqueous sodium bicarbonate, to remove some residual p-toluenesulfonic acid, then evaporated to give cyclopropanecarboxylic acid[3-(5-ethoxy-6-ethyl-1H-benzoimidazol-2-yl)-1H-pyrazol-4-yl]amide (120 mg) as a white solid. LC-MS (Method E): RT=2.36 minutes, 340 (M+H)+.

1. temperaturecooled
2. extractionThe aqueous mixture was extracted twice with ethyl acetate (75 mL)
3. customThe combined extracts were evaporated
4. dissolutionthe residue was redissolved in a mixture of methylene chloride (100 mL) and methanol (10 mL)
5. washThis solution was washed with aqueous sodium bicarbonate
6. customto remove some residual p-toluenesulfonic acid
7. customevaporated