The cyclization of N6‐(ω‐hydroxyalkyl)adenines with a N6H‐group leads to N6,N1 ring closure regardless of the method of the cyclization that was used. Five‐membered to eight‐membered rings were obtained using NBS/PPh3; however, under Mitsunobu conditions, the eight‐membered fused purine was not formed. Surprisingly, the cyclization of N6‐methyl‐N6‐(4‐hydroxybutyl)adenine only leads to N6,N7 ring closure using both methods.
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