Potassium Carbonate → 9-(4-benzoylbenzyl)-6-chloro-9H-purine

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The synthesis of 9-(4-benzoylbenzyl) -9H-adenine (20) was achieved by the following procedure (Scheme 9). A mixture of 6-chloropurine (3.09 g, 20 mmol), 4-benzoyl-benzyl chloride (6.05 g, 22 mmol)and K2CO3 (3.04 g, 22 mmol) in DMF (50 ml) was stirred overnight at rt, diluted with water (400 ml), and extracted with EtOAc (3×100 ml) (Scheme 9)52. The combined organic layers were washed with water and brine, dried over MgSO4, concentrated in vacuo, and subjected to flash-chromatography on silica gel eluting with CH2Cl2 -acetone (80:20). The fractions containing the higher Rf, the major component, were combined and concentrated in vacuo to give 2.86 g (41%) of 9-(4-benzoylbenzyl)-6-chloro-9H-purine. To a solution of this iminochloride (1.05 g, 3 mmol) in EtOH (20 ml) was added a 2M solution of NH3 in MeOH. This medium was warmed overnight at 90° C. under pressure (constant volume). It was then cooled and concentrated in vacuo. The residue was washed successively with a 1M solution of NaHCO3, water, iPrOH, and hot CH2Cl2, and then was recrystallized from butanol to give 0.53 g (54%) of 9-(4-benzoylbenzyl)-9H-adenine (20). 1H NMR (DMSO) δ 5.49 (s, 2H, CH2), 7.27-7.71 (m, 9H, H-Ar), 8.15 (s, 1H, H-2), 8.30 (s, 1H, H-8). ##STR10## Synthesis of 9-[(4-bis-phenyl)buten-4-yl]-9H-adenine (21)

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