FIELD: organic chemistry. SUBSTANCE: product of the formula (I) (image), where R - alkyl; R1 - benzoyl or methyl. Reagent 1: corresponding dialkyl-N6-cyanogriseolate-N1-oxide. Reagent 2: compound R1X. Reaction conditions: in the presence of organic base trialkylamine in acid amide at the room temperature. Synthesized compounds are able to inhibit phosphodiesterase activity. EFFECT: improved method of synthesis. 1 tbl
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