Cyclopentylamine → N4-cyclopentylpyrimidine-2,4-diamine

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A mixture of 2-amino-4-chloropyrimidine (22.8 g, 176 mmol), cyclopentylamine (20.9 mL, 211 mmol) and triethylamine (29.4 mL, 211 mmol) in EtOH (200 mL) was heated at reflux (105° C., oil bath) for 48 h. Upon workup, the volatile was removed in vacuo. The residue was poured into ice and saturated Na2CO3 aqueous solution and extracted with ethyl acetate (3×). The combined organics were washed with saturated Na2CO3 aqueous solution (1×), dried over Na2SO4, and concentrated in vacuo to give N4-cyclopentylpyrimidine-2,4-diamine (315) (26.5 g) as a light yellow solid of 92% purity. This batch of material was taken onto the next step without further purification. LCMS-ESI (POS), M/Z, M+1: Found 179.1, Calculated 179.1.

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