Cl[C:2]1[N:10]=[CH:9][N:8]=[C:7]2[C:3]=1[N:4]=[CH:5][N:6]2[CH:11]=[CH2:12].[CH:13]1([NH2:16])[CH2:15][CH2:14]1.O.Cl.C1(N)CC1>C1COCC1>[CH:13]1([NH:16][C:2]2[N:10]=[CH:9][N:8]=[C:7]3[C:3]=2[N:4]=[CH:5][N:6]3[CH:11]=[CH2:12])[CH2:15][CH2:14]16-Chloro-9-vinylpurine (0.54 g, 3 mmol) was mixed with cyclopropylamine (1.71 g, 30 mmol) in THF (10 mL) and the mixture was stirred for 5 h at rt. Water was added to dissolve the white precipitate (cyclopropylamine hydrochloride). The aqueous layer was extracted with ethyl acetate and the combined organic layers were dried over sodium sulfate, concentrated on a rotavap, and then recrystallized from EtOAc/hexanes yielding the desired product.
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