C1(CN[C:6]2[N:14]=[CH:13][N:12]=[C:11]3[C:7]=2[N:8]=[CH:9][N:10]3[C@H]2CC[C@@H](CO)O2)CC1.C(N(CC)CC)C.C1(CC(Cl)=O)C=CC=CC=1>C(#N)C.CN(C)C1C=CN=CC=1>[N:14]1[CH:6]=[C:7]2[C:11]([NH:10][CH:9]=[N:8]2)=[N:12][CH:13]=16-(Cyclopropylmethylamino)-9-[(2R,5S)-tetrahydro-5-(hydroxymethyl)-2-furyl]-9H-purine (0.5 g, 1.44 mmoles) was dissolved in 20 mL acetonitrile. 4-Dimethylaminopyridine (10.2 mg, 0.08 mmoles) and triethylamine (620 μL, 4.4 mmoles) were added and the flask was chilled in an ice bath under a nitrogen atmosphere. Phenylacetyl chloride (1.11 g, 7.2 mmoles, Aldrich Chemical Co., Madison, Wis.) was added dropwise to the flask over a period of 15 minutes. The reaction was stirred at room temperature for 0.5 hours. The reaction was quenched with methanol and solvents were removed under vacuo. The residue was dissolved in 2 mL CHCL3 /CH3OH (9:1) and chromatographed on a column of silica gel (5×15 cm) in the application solvent. Additional chromatography was performed on the product containing fractions using a Chromatotron 2 mm silica gel plate developed with a hexane:acetone mixture (7:3). Lyophilization of the product containing fractions afforded 0.459 g of 6 -(cyclopropylmethylamino)-9-[(2R,5S)-tetrahydro-5-[(phenylacetyl)methyl]-2-furyl)]-9H-purine as an oil (78% yield): m.p. <25° C.
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