反应详情

A solution of 3-[(2,5-dichloro-4-pyridinyl)amino]benzoic acid (500 mg, 1.766 mmol), N-(3-dimethylaminopropyl)-N′-ethylcarbodiimide (EDC) (339 mg, 1.766 mmol) and 1-hydroxybenzotriazole (HOBT) (270 mg, 1.766 mmol) in N,N-dimethylformamide (3532 μl) was stirred at room temperature for 30 min. To this solution O-methylhydroxylamine(aminoxy)methane (148 mg, 1.766 mmol) was then added and stirred for another 10 min. The reaction mixture was cooled using an ice water bath. Then diisopropylethylamine (617 μl, 3.53 mmol) was added. After the addition was finished, the reaction mixture was stirred at room temperature overnight. The reaction mixture was followed by HPLC and LCMS. The final crude material was worked up by addition of saturated aqueous NaHCO3 and CH2Cl2. Organic phase was washed with brine then dried over MgSO4. The solution was filtered and solvent was removed by evaporation. The oil like crude material was loaded on silica column and eluted with MeOH in CH2Cl2 with NH4OH 0.1% to give the target compound 2-[(2,5-dichloro-4-pyridinyl)amino]-N-(methyloxy)benzamide (320 mg, 1.025 mmol, 58.0% yield) as a yellow solid; MS; M(C13H11Cl2N3O2)=312.15, (M+H)+=312, 313.9; 1H NMR (400 MHz, CHLOROFORM-d) ppm 9.66 (br. s., 1 H) 9.60 (br. s., 1 H) 8.20 (s, 1 H) 7.49-7.61 (m, 3 H) 7.24 (s, 1 H) 7.09-7.16 (m, 1 H) 3.90 (s, 3 H).

1. temperatureThe reaction mixture was cooled
2. additionAfter the addition
3. stirringthe reaction mixture was stirred at room temperature overnight
4. washOrganic phase was washed with brine
5. dry with materialthen dried over MgSO4
6. filtrationThe solution was filtered
7. customsolvent was removed by evaporation
8. washeluted with MeOH in CH2Cl2 with NH4OH 0.1%