Potassium Phosphate, Tribasic → 4-(Pyrimidin-5-ylamino)-piperidine-1-carboxylic acid tert-butyl ester

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A mixture of 5-bromo-2-phenyl-pyrimidine (3.50 g, 14.89 mmol, 1.0 equiv), 4-amino-piperidine-1-carboxylic acid tert-butyl ester (4.48 g, 22.33 mmol, 1.5 equiv), copper(I) iodide (0.28 g, 1.49 mmol, 0.1 equiv), N,N-diethylsalicylamide (0.58 g, 2.98 mmol, 0.2 equiv) and K3PO4 (3.16 g, 14.89 mmol, 1.0 equiv) in degassed DMF (30 mL) was heated under Ar to 90° C. for 24 h. The solvent was removed under reduced pressure and the crude reaction product extracted from water (300 mL) and 25% NH4OH (30 mL) with ethyl acetate (3×300 mL). The combined organic phases were dried over Na2SO4, concentrated by evaporation under reduced pressure and the crude material purified by silica column chromatography eluting with a gradient of heptane/ethyl acetate (4:1→1:1) to provide 1.98 g (38%) of the title compound. MS (ESI): 377.1 [M+Na]+.

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