Syntheses of 5,6-dihydrocytidine (IV), 5,6-dihydroisocytidine (V), and the 2-thioanalogue (VII) of the former are described. U.v. spectroscopic data for (V) and its 2-N-methyl and 2,2-di-N-methyl derivatives (IX) and (X) in alcoholic solution reveal amino rather than imino tautomeric states. The n.m.r. spectra of the dihydrocytidines and their derivatives are reported.
V. Šbkarić, B. Gašpert, M. Hohnjec and G. Laćan, J. Chem. Soc., Perkin Trans. 1, 1974, 267 DOI: 10.1039/P19740000267
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