4-Chloropyridine → cis 3-Hydroxy-4-(pyridin-4-ylaminomethyl)-piperidine-1-carboxylic acid benzyl ester

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Reaction Steps

A mixture of the cis 4-aminomethyl-3-hydroxy-piperidine-1-carboxylic acid benzyl ester (245 mg) from Step 4 above, 4-chloropyridine (105 mg) and isopropanol (0.4 mL) was heated to 120° C. in a sealed vial for 24 h, cooled to room temperature and the solvents evaporated. The resulting crude mixture was purified by flash column chromatography (DCM to 80/20/2 DCM MeOH NH4OH) to give impure cis 3-hydroxy-4-(pyridin-4-ylaminomethyl)-piperidine-1-carboxylic acid benzyl ester. This was purified by preparative reverse phase HPLC (95% H2O 5% MeCN to 100% MeCN both containing 0.1% TFA). Evaporation gave an oil which was partitioned between DCM and aqueous sodium bicarbonate solution. The organic layer was dried over anhydrous sodium sulfate and solvent evaporated to give a white solid. M.S (M+1): 342.

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