p-Toluenesulfonic acid → 2-Chloro-6-methyl-8-propylpurine

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A mixture of 2-Chloro-4,5-diamino-6-methylpyrimidine (0.80 g, 5.04 mmol), trimethylorthobutyrate (1.2 ml, 7.6 mmol) and p-TsOH (0.08 g) in 2-methoxyethanol (24 ml) was heated in an oil bath at 140° C. for 24 hours. The product was isolated as described in Step 2 of Example 12 and purified by flash chromatography using EtOAc-hexane (1:1) to give the crystalline titled compound (0.5 g, 47%). NMR (CDCl3): δ1.03 (t, J=8 Hz,3H), 1.9 (q,2H), 2.82 (s, 3H), 3.0 (t, J=8 Hz, 2H). FAB-MS: m/e 211 and 213 (M+H). Analysis calculated for C9H11N4Cl: C, 51.31; H, 5.26; N, 26.60. Found: C, 51.43; H, 5.50, N, 26.81.

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