FIELD: organic chemistry. SUBSTANCE: product of the formula where 1a - R-tert. -butyl, m. p. is 347-349 C or 1b - R - phenyl, m. p. is 375-380 C. Structure is confirmed by data of IR-, NMR- and mass-spectrum. Reagent 1: corresponding mono-N-substituted urea. Reagent 2: glyoxal. Reaction conditions: at 85-90 C in the presence of sulfuric acid in the medium of aqueous isopropanol at the definite ratio of reagents. EFFECT: improved method of synthesis. 2 tbl
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