Benzyl Chloride → 9-Benzyl-2-pentyladenine

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A mixture of 4-amino-5-cyanoimidazole (1.09 g, 11 mmol) and hexaneamide (4.39 g, 38 mmol) was heated at 210° C. for 15 h under N2 atmosphere. After cooling, the residue was dissolved in a mixture of DMF (200 ml) and water (50 ml). Benzyl chloride (3 ml) and K2CO3 (3 g) was added to the mixture, and heated at 70° C. for 6 h. Solvent was evaporated under vacuum, the residue was extracted by CH2Cl2. The resulting organic layer was evaporated under vacuum. 9-benzyl-2-pentyladenine was obtained by the purification of the residue by column chromatography (CH2Cl2 :MeOH=100:1-50:1). Bromine (2 ml) was added to the mixture of 9-benzyl-2-hexyladenine and NaOAc (5 g) in ACOH (40 ml) within an ice bath, and the mixture was heated at 70° C. for 6 h. Solvent was evaporated under vacuum, the residue was extracted by EtOAc. The resulting organic layer was evaporated under vacuum, 9-benzyl-8-bromo-2-pentyladenine was obtained by the purification of the residue by column chromatography (CH2Cl2 :MeOH=100:1). A mixture of 9-benzyl-8-bromo-2-pentyladenine and conc.HCl (20 ml) was refluxed for 6 h. After cooling, aqueous NH3 was added to neutralize and crystallize the product (pH=8), and the desired compound was collected by filtration (0.25 g, Yield: 8%).

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