An Efficient Method for the Synthesis of [4–<sup>15</sup>N]Cytidine, 2′-Deoxy[4–<sup>15</sup>N]Cytidine, [6–<sup>15</sup>N]adenosine, and 2′-Deoxy [6–<sup>15</sup>N]adenosine Derivatives
Nucleophilic substitution reactions of 4-azolyl-1-beta-D-ribofuranosyl-pyrimidin-2(1H)-one and 6-azolyl-9-beta-D-ribofuranosyl-9H-purine derivatives, which were converted from uridine and inosine, with [N-15]phthalimide in the presence of triethylamine or DBU gave N-4-phthaloyl[4-N-15]cytidine and N-6-phthaloyl[6-N-15]- adenosine derivatives, respectively, in high yields. Similar reactions of those azolyl derivatives with succinimide afforded N-4-succinylcytidine and N-6-succinyladenosine derivatives in high yields. The corresponding 2'-deoxyribonucleosides were also synthesized efficiently through the same procedure.
Ahmed, A. F. Sayed, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1995, vol. 34, # 2, p. 135 - 136