反应详情

To a magnetically stirred solution of 5-chloro-3-[(4-chloro-3-trifluoromethyl-benzenesulfonyl)-methoxymethyl-amino]-pyridine-2-carboxylic acid (458 mg, 1.00 mmol) in anhydrous methylene chloride (5 mL) was added oxalyl chloride (1.0 mL) at room temperature. The reaction was heated at reflux for 2 h, then concentrated to dryness. The residue was dissolved in methylene chloride (4 mL) and this solution was added dropwise to a magnetically stirred solution of triethylamine (1.0 mL) and N-methylaniline (108 mg, 1.00 mmol) in methylene chloride (2 mL). The reaction mixture was stirred 1 h (the reaction was monitored by LCMS), quenched with saturated aqueous NH4Cl (50 mL), and the aqueous layer was extracted with EtOAc (3×75 mL). The combined extracts were washed with 0.5 M HCl (50 mL), washed with water (50 mL), dried (MgSO4), filtered and concentrated. The residue was purified by chromatography on silica gel using a gradient of ethyl acetate-hexane (0:100 to 100:0) to afford pure 5-chloro-3-[(4-chloro-3-trifluoromethyl-benzenesulfonyl)-methoxymethyl-amino]-pyridine-2-carboxylic acid N-methyl-N-phenylamide. MS m/z: 548.2 (M+H), 526.0 (M+H-MeOH).

1. temperatureThe reaction was heated
2. temperatureat reflux for 2 h
3. concentrationconcentrated to dryness
4. dissolutionThe residue was dissolved in methylene chloride (4 mL)
5. customquenched with saturated aqueous NH4Cl (50 mL)
6. extractionthe aqueous layer was extracted with EtOAc (3×75 mL)
7. washThe combined extracts were washed with 0.5 M HCl (50 mL)
8. washwashed with water (50 mL)
9. dry with materialdried (MgSO4)
10. filtrationfiltered
11. concentrationconcentrated
12. customThe residue was purified by chromatography on silica gel using a gradient of ethyl acetate-hexane (0:100 to 100:0)