ESTER DERIVATIVES OF ASPARTYLDIPEPTIDES AND SWEETENING SUBSTANCES Russian patent published in 2002 - IPC

FIELD: organic chemistry, peptides. SUBSTANCE: invention relates to compounds of the formula (I) including their salts where R₁, R₂, R₃, R₄, u R₅ mean independently each of other a substituent taken among hydrogen atom, hydroxyl group, alkoxy-group with 1-3 carbon atoms, alkyl group with 1-3 carbon atoms and hydroxyalkyloxy-group with 2 or 3 carbon atoms; or R₁ and R₂, or R₂ and R₃ in common form methylenedioxy-group where R₄, R₅ and R₁ or R₃ no forming methylenedioxy-group are their moiety and mean independently each of other any substituents designated for R₁, R₂, R₃, R₄, u R₅, respectively, as indicated above; R₆ means hydrogen atom or hydroxyl group and R₇ means a substituent taken among methyl group, ethyl group, isopropyl group, n-propyl group and tert.-butyl group under condition that derivatives where substituents from R₁ to R₅ are hydrogen atoms and derivatives where R₂ or R₄ is methoxy- group and R₃ is hydroxyl group are excluded. Compounds show strong sweetening effect and useful for use as sweetening substances. Invention proposes also a sweetening substance containing the indicated compound. EFFECT: valuable properties of compounds. 23 cl, 1 tbl, 22 ex