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In continuation of a series of works devoted to the synthesis of new pyrimidine derivatives and study of their immunotropic properties [1 -3], we have obtained a series of sulfur-containing compounds (acyclonucleosides) according to the scheme depicted below.Pyrimidine acyclonucleosides VII-X were obtained by interaction of 6-methyluracil or 5-hydroxy-6-methyluracil with epichlorohydrin (ECH) in the presence of catalytic amounts of potassium carbonate in DMF at 70-80~ [4], followed by the treatment of products III-VI with sodium sulfide.Alkylation of 6-methyluracil by ECH leads to the formation, in addition to compound III, of 1-(2-hydroxy-3-chloropropyl)-6-methyluracil (V) in 8% yield. The reaction of of 5-hydroxy-6-methyluracil with ECH under the same condi-I Institute of Organic Chemistry, Ural Scientific Center, Russian Academy of Sciences, Ufa, Bashkortostan, Russia.tions yields 17% of 3-(2-hydroxy-3-chloropropyl)-5-hydroxy-6-methyluracil (VI) (in addition to compound IV).The positions of substituents in compounds V and VI was confirmed by the data of UV spectroscopy. Upon changing the pH from 1 to 12, the maximum of the absorption band in the UV spectrum of compound V remains unchanged, while that in the spectrum of VI exhibits a bathochromic shift by 32.5 nm, which is characteristic of the 1-and 3-substituted uracil derivatives