[CH2:1]([N:9]1[C:17]([CH2:18]O)=[N:16][C:15]2[C:10]1=[N:11][CH:12]=[N:13][C:14]=2[NH2:20])[CH2:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1.P(Br)(Br)[Br:22]>C(Cl)Cl>[CH2:1]([N:9]1[C:17]([CH2:18][Br:22])=[N:16][C:15]2[C:10]1=[N:11][CH:12]=[N:13][C:14]=2[NH2:20])[CH2:2][C:3]1[CH:8]=[CH:7][CH:6]=[CH:5][CH:4]=1A solution of N9-phenethyl-8-hydroxymethyladenine (1 mmol) in methylene chloride was treated with phosphorus tribromide (1 mmol) at 25° C. for 1 h. Extraction and chromatography gave N9phenethyl-8-bromomethyl-adenine as a white solid. TLC: Rf=0.31,10% MeOH—CH2Cl2.
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