FIELD: organic chemistry. SUBSTANCE: product: derivatives of dihydropyrimidine of the formula (I) where n=1 or 2; R1 hydrogen or methyl; X oxygen or NR2; R2 hydrogen or butyl; if n=1 then Y hydrogen and if n=2 then Y hexamethylene group. Reaction conditions: interaction of acetoacetic ester or acetacetamide of the formula II with aldehyde of the formula (III) Y-(CHO)n and ammonia. Compounds of the formula I show thermo-andphotostabilizing agents for polymers. EFFECT: improved method of synthesis.
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