Methanesulfonic Acid → Piperidine-4-carboxylic acid [6-(2-methoxy-phenyl)-pyrimidin-4-yl]amide methane sulfonate

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Reaction Steps

To a clear solution of piperidine-4-carboxylic acid [6-(2-methoxy-phenyl)-pyrimidin-4-yl]-amide (compound #6A) (2.5 g, 8 mmol) in methanol:chloroform (1:1, 75 ml) was added methane sulfonic acid (5 ml, 80 mmol) dropwise at 0° C. and the formed clear solution was stirred at room temperature for half an hour. A white solid precipitated out and diethyl ether (150 ml) was added to precipitate more of the solid which was then filtered off and washed with diethyl ether (50 ml). This crude solid was dissolved in 90 ml of chloroform: methanol (2:1) and the mixture heated at 60° C. to become a clear solution. Then diethyl ether (90 ml) was added and the turbid solution was kept at room temperature for one hour. The formed crystalline solid was filtered off, washed with diethyl ether (50 ml) and dried under high vacuum to give piperidine-4-carboxylic acid [6-(2-methoxy-phenyl)-pyrimidin-4-yl]amide methane sulfonate (compound #15A, methane sulfonic acid salt of compound #6A) (2.9 g, 89%) as a white solid.

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