反应详情

To a solution of 5-amino-4-(1,3-benzodioxol-5-yl)-3-methoxy-1-methyl-1H-pyrazole (Preparation 43) (100 mg) and 4-dimethylaminopyridine (50 mg) in pyridine (4 ml) at room temperature was added 4-methoxybenzenesulfonyl chloride (145 mg), the resulting mixture was stirred at room temperature for 16 hours. The reaction mixture was concentrated under reduced pressure and the residue quenched with citric acid (10%, 10 ml) and then extracted with ethyl acetate (2×10 ml). The organic fractions were combined and washed with saturated aqueous sodium chloride solution (50 ml) the organic fraction was then dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure. The residue (259 mg) was purified by preparative HPLC on a 5μ ODS Phenomenex Magellen™ column with a gradient elution of acetonitrile (5% to 95%) and 0.1M NH4OAc (95% to 5%) to yield the desired product as an amorphous white solid (10 mg).

1. concentrationThe reaction mixture was concentrated under reduced pressure
2. customthe residue quenched with citric acid (10%, 10 ml)
3. extractionextracted with ethyl acetate (2×10 ml)
4. washwashed with saturated aqueous sodium chloride solution (50 ml) the organic fraction
5. dry with materialwas then dried over anhydrous magnesium sulfate
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. customThe residue (259 mg) was purified by preparative HPLC on a 5μ ODS Phenomenex Magellen™ column with a gradient elution of acetonitrile (5% to 95%) and 0.1M NH4OAc (95% to 5%)