Adenine → 2-[1-(6-amino-9H-purin-9-yl)ethyl]-3-bromo-6-methyl-4H-pyrido[1,2-a]pyrimidin-4-one

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A mixture of 3-bromo-2-(1-chloroethyl)-6-methyl-4H-pyrido[1,2-a]pyrimidin-4-one (1.24 g, 4.11 mmol), adenine (Sigma, 1.08 g, 8.04 mmol), and potassium carbonate (1.11 g, 8.04 mmol) in N,N-dimethylformamide (20 mL) was stirred at room temperature overnight. The suspension was then poured into water and extracted with methylene chloride. The combined organic layers were washed with water, brine, and then the organic layers dried and evaporated to dryness. The residue was chromatographed on silica gel, eluting with 0 to 10% MeOH in methylene chloride, to provide the desired product (176 mg, 10.7%). LCMS calculated for C16H15BrN7O (M+H)+: m/z=400.1. Found: 400.1. 1H NMR (DMSO-d6, 300 MHz) δ 8.44 (1H, s), 8.07 (1H, s), 7.67 (1H, dd, J=8.7 and 7.2 Hz), 7.30 (1H, br d, J=8.7 Hz), 7.20 (2H, s), 6.99 (1H, br d, J=7.2 Hz), 6.15 (1H, q, J=7.2 Hz), 2.91 (3H, s), 1.84 (3H, d, J=7.2 Hz) ppm.

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