Cyclobutylamine → 5,6-dimethyl-N4-(pentan-3-yl)-N2-(pyridin-2-ylmethyl)pyrimidine-2,4-diamine

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The titled compound was synthesized according to the procedure described for preparation of N4-cyclopentyl-5,6-dimethyl-N2-(pyridin-2-ylmethyl)pyrimidine-2,4-diamine (Example 29) using cyclobutanamine instead of cyclopentanamine. The crude material was purified by column chromatography eluting with mixture of chloroform/ethanol/20% water solution of ammonia (200:10:1), and then the final product was washed with diethyl ether to afford the titled compound as a white solid. 1H NMR (300 MHz, CDCl3) δ ppm 0.81 (t, J=7.3 Hz, 3H), 1.36-1.43 (m, 2H), 1.50-1.57 (m, 2H), 1.90 (s, 3H), 2.26 (s, 3H), 3.94-4.00 (m, 1H), 4.17 (bs, 1H), 4.72 (d, J=5.9 Hz, 2H), 5.72 (bs, 1H), 7.13 (t, J=7.5 Hz, 1H), 7.36 (d, J=7.3 Hz, 1H), 7.60 (t, J=7.5 Hz, 1H), 8.54 (d, J=4.8 Hz, 1H); MS (ESI) m/z 300.1 (M+1)+.

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