Methylation of N′-benzyloxy-5-formamido-1-β-D-ribofuranosylimidazole-4-carboxamidine (1) followed by hydrogenolysis of the N′-benzyloxy group and cyclization gave the hitherto unknown 3-methyladenosine (4), which was easily hydrolysed to 3-methyladenine (6) in 0·1 N aq. HCl and to the imidazole ribosides (3) and (5) under basic conditions.
T. Saito and T. Fujii, J. Chem. Soc., Chem. Commun., 1979, 135 DOI: 10.1039/C39790000135
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