Abstract 1, 3, 4, 5-Tetra-O-acetylsorbopyranosylureas were prepared from sorbopyranosyl chloride via 1, 3, 4, 5-tetra-O-acetylsorbopyranosylisocyanates. 1-Ureido- and 6-ureidosorbofuranoses were obtained from the corresponding aminosorboses. The transformations of the ureas thus obtained into N-(sorbose)thymines were achieved, although with difficulty, by the direct condensation of halogeno- or tosylsorboses with metal salts of thymine.
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Tokuyama et al. (1966) studied this question.
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