To a solution of 6-chloro-8-(2-chlorophenyl)-9-(4-chlorophenyl)-9H-purine (78 mg, 0.21 mmol, 1 eq.) in 2 mL of dioxane was added [4-(aminomethyl)cyclohexyl]methanamine (89 mg, 0.62 mmol, 2 eq.). The reaction was heated to 80° C. for 16 h. The reaction was concentrated in vacuo. The crude material was purified by silica gel column chromatography using 0-100% CMA 80/ethyl acetate to yield 76 mg (76%) of N-{[4-(aminomethyl)cyclohexyl]methyl}-8-(2-chlorophenyl)-9-(4-chlorophenyl)-9H-purin-6-amine which was carried forward. 1H NMR (300 MHz, CHLOROFORM-d) δ ppm 0.85-1.13 (m, 2 H) 1.40-1.72 (m, 8 H) 1.74-2.01 (m, 2 H) 2.85-3.15 (m, 2H) 3.48-3.75 (m, 2H) 4.25-4.74 (m, 2 H) 5.98 (br. s., 1 H) 7.05-7.59 (m, 8 H) 8.44 (s, 1H).
