反应详情

To a cooled mixture of 2-chloro-5-methyl-benzoic acid (1 g, mmol), N,O-dimethylhydroxylamine (860 mg, 8.82 mmol) and Et3N (3.27 mL) in CH2Cl2 (10 mL) was added 1-propane phosphonic acid cyclic anhydride (4.49 mL, 7.05 mmol; 50 wt % solution in EtOAc) dropwise and stirred at room temperature for 3 h. The reaction mixture was filtered, washed with CH2Cl2 (mL), evaporated to dryness and subjected to column chromatography (SiO2, 40% EtOAc-hexanes) to obtain 2-chloro-N-methoxy-5,N-dimethyl-benzamide (1.19 g) as white crystalline solid in 95% yield. ESMS m/z (relative intensity): 214.1 (M+H)+ (100).

1. filtrationThe reaction mixture was filtered
2. washwashed with CH2Cl2 (mL)
3. customevaporated to dryness