N-alkylaspartyl amide derivative and sweetening agent

An N-alkylaspartyl amide compound represented by the following formula (1):

• wherein:
• R1 is selected from the group consisting of a hydroxyl group, an alkoxy group having 1 to 4 carbon atoms, an alkoxycarbonyl group having 2 to 5 carbon atoms, and a substituent group represented by the following general formula (2), and
• wherein R7, R8, R9, R10 and R11 are reciprocally independent from each other and each denotes a substituent group selected from the group consisting of a hydrogen atom, a hydroxyl group, an alkoxy group having 1 to 3 carbon atoms and an alkyl group having 1 to 3 carbon atoms, or wherein R7 and R8, or R8 and R9 may be combined together to form a methylene dioxy group, provided that at least one of R7, R8, R9, R10 and R11 is not a hydrogen atom;
• R2 and R3 are reciprocally independent from each other and each denotes a substituent group selected from the group consisting of a hydrogen atom and an alkyl group having 1 to 4 carbon atoms, or wherein R2 and R3 are combined together to form an alkylene group having 2 to 5 carbon atoms;
• m and n are reciprocally independent from each other and each represents a numerical value selected from 0, 1, 2, 3 and 4;
• R4 and R5 are reciprocally independent from each other and each denotes a substituent group selected from the group consisting of a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxyalkyl group having 2 to 7 carbon atoms, a hydroxyalkyl group having 1 to 6 carbon atoms, a phenyl group, and a 2-furyl group, or wherein R4 and R5 are combined together to form an alkylene group having 2 to 5 carbon atoms;
• R6 is selected from the group consisting of an alkyl group having 1 to 12 carbon atoms, a substituent group represented by the following formula (3), and a substituent group represented by the following formula (4)
• wherein R12 represents a substituent group selected from the group consisting of a hydrogen atom and an alkyl group having 1 to 4 carbon atoms;
• R13 represents a carbocyclic compound residue group which contains 3 to 12-membered ring(s), wherein the 3 to 12-membered ring(s) are substituted or unsubstituted, and wherein the 3 to 12-membered ring(s) are saturated or unsaturated;
• and p denotes 0 or 1,
• wherein R14 and R15 are reciprocally independent from each other and each denotes a substituent group selected from the group consisting of a phenyl group, a hydrogen atom, a cycloalkyl group having 3 to 4 carbon atoms, an alkyl group having 1 to 6 carbon atoms, an alkoxyalkyl group having 2 to 7 carbon atoms and a 2-or 3-thienyl group, wherein said phenyl group may have a substituent group(s) selected from the group consisting of hydroxyl group(s), alkoxy group(s) having 1 to 3 carbon atoms, alkyl group(s) having 1 to 3 carbon atoms and methylene dioxy group(s);
• and q denotes 0 or 1;
• and
• C* means an any steric configuration;
• or
• a salt form thereof.