[OH:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]([OH:11])[C:3]=1[C:4]([NH2:6])=[O:5].[C:12](=O)([O-])[O-].[Cs+].[Cs+].CI>CN(C)C=O.C(OCC)(=O)C.C(OCC)C>[OH:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]([O:11][CH3:12])[C:3]=1[C:4]([NH2:6])=[O:5]
To a solution of 2,6-dihydroxybenzamide (2 g, 12.66 mmol) in dimethylformamide (100 mL) were added cesium carbonate (3.922 g, 12.03 mmol) and methyl iodide (756 μL, 12.03 mmol). The reaction mixture was stirred at room temperature for 36 h and was taken in 200 mL of ethyl acetate and diethyl ether (1:1 ratio). It was washed with water, brine and dried over anhydrous sodium sulfate. The solid was then filtered off, and the filtrate was concentrated in vacuo. Purification of the residue by flash chromatography (Biotage system, KP-Sil™ 32-63 μm, 60 Å silica gel) eluting with 25% ethyl acetate in hexanes yielded 2-hydroxy-6-methoxy-benzamide (1.4 g, 66%).
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