Purines. XLVIII. Syntheses and proton nuclear magnetic resonance study of 2-deuterioadenines substituted or unsubstituted at the 9-position and of their N-oxygenated derivatives.
2-Deuterated adenosine (5) was conveniently prepared from adenosine (1) by applying the ring-fission and reclosure methodology of 1, N6-ethenoadenosine (2) and a new oxidative unmasking method of the etheno moiety.