Triethylamine → Tert-butyl 2-(2-aminopyrimidin-4-ylamino)ethylcarbamate

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A solution of tert-butyl 2-(2-amino-5-bromo-6-chloropyrimidin-4-ylamino)ethylcarbamate (Example 1A, 18.60 g, 0.0507 mole), triethylamine (135.0 mL, 0.9686 mole), and 10% palladium on charcoal (7.40 g) in 1:1 ethyl acetate/methanol (500 mL) was treated with hydrogen (60 psi) for two days. Insoluble material was removed by filtration through a pad of diatomaceous earth and the filtrate was concentrated under reduced pressure. The residue was partitioned between ethyl acetate and dilute aqueous sodium hydroxide. The organic layer was dried (MgSO4) and filtered. The filtrate was concentrated under reduced pressure to give tert-butyl 2-(2-aminopyrimidin-4-ylamino)ethylcarbamate as a white, amorphous solid (12.7 g, 98.8% yield). 1H NMR (300 MHz, CD3Cl3) δ ppm 1.44 (s, 9H), 3.27-3.37 (m, 2H), 3.37-3.47 (m, 2H), 5.00 (sbr, 2H), 5.28 (sbr, 1H), 5.52 (sbr, 1H), 5.78 (d, J=6 Hz, 1H), 7.76 (d, J=6 Hz, 1H). MS (DCl—NH3) m/z=254 (M+H)+.

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