反应详情

温度

0 °C

Into a 50 mL roundbottom flask, was placed a solution of 1-(5-(2,6-difluorobenzamido)pyrazin-2-yl)-2-(trifluoromethyl)-1H-benzo[d]imidazole-5-carboxylic acid (xiii) (50 mg, 0.11 mmol, −1.00 equiv) in DCM (15 ml) and DMF (1 drop). To the above stirred solution was added oxalyl dichloride (70 mg, 0.55 mmol, 5.00 equiv) dropwise at 0° C. The resulting solution was allowed to stir at 0° C. for 4 hours then was concentrated by evaporation under vacuum using a rotary evaporator. The residue was then taken up by DCM (10 ml) and then add dropwise to a stirred solution Of Et3N (40 mg, 3.00 equiv) and 2,2-diethoxyethanamine (15 mg, 0.11 mmol, 1.00 equiv) in DCM (10 mL) at 0° C. The resulting solution was allowed to stir overnight at room temperature, then was washed with H2O (2×100 mL) and dried over Na2SO4. Removal of the solvent and volatile components afforded the crude product 1-[5-(2,6-difluoro-benzoylamino)-pyrazin-2-yl]-2-trifluoromethyl-1H-benzoimidazole-5-carboxylic acid (2,2-diethoxy-ethyl)-amide (xiv) (50 mg, 64% yield) as a yellow solid that was used directly in the next step.

1. customInto a 50 mL roundbottom flask, was placed
2. concentrationthen was concentrated by evaporation under vacuum
3. customa rotary evaporator
4. stirringto stir overnight at room temperature
5. washwas washed with H2O (2×100 mL)
6. dry with materialdried over Na2SO4
7. customRemoval of the solvent and volatile components