Synthetic compounds useful as nodulation agents of leguminous plants and preparation processes thereof

A compound of formula (I)

• (I)
• in which
• n represents 1, 2 or 3;
• A represents a substituent selected from the group consisting of —C(O)—, —C(S)—, and —CH2—;
• B is selected from the group consisting of
• a heteroarylene comprising 1 or 2 hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur;
• a heteronaphthylene comprising 1 or 2 hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur;
• a divalent radical derived from 2 fused aromatic rings containing 5 or 6 atoms each;
• a divalent radical derived from 2 fused aromatic or heteroaromatic rings containing 5 or 6 atoms each and comprising 1 or 2 hetero atoms selected from the group consisting of nitrogen, oxygen and sulfur;
• these groups optionally being substituted with one or two substituents independently selected from the group consisting of halogen, CN, C(O)OR14, C(O)NR15R16, CF3, OCF3, —NO2, N3, OR14, SR14, NR15R16 and C1-6-alkyl;
• C represents a substituent selected from the group consisting of —O—, —S—, —CH2—, and CH—(C1-C6-alkyl);
• D represents a linear or branched, saturated or unsaturated hydrocarbon-based chain containing from 2 to 20 carbon atoms;
• E and G represent, independently of each other, a substituent selected from the group consisting of H, OH, OC(O)CH3 and NHC(O)CH3;
• R1 represents a substituent selected from the group consisting of H, C1-6-alkyl, C(O)H and C(O)CH3;
• R2, R3, R6, R14, R15, and R16 represent, independently of each other, a substituent selected from the group consisting of H, C1-6-alkyl, C(O)C1-6-alkyl, —C(S)C1-6-alkyl, —C(O)OC1-6-alkyl, —C(O)NH2, —C(S)NH2, —C(NH)NH2, —C(O)NHC1-6-alkyl, —C(S)NHC1-6-alkyl and —C(NH)NHC1-6-alkyl;
• R4 represents a substituent selected from the group consisting of H, C1-6-alkyl and R21;
• R5 represents a substituent selected from the group consisting of H, C1-6-alkyl, fucosyl and R22;
• R7 represents a substituent selected from the group consisting of H, C1-6-alkyl, arabinosyl and R23;
• R8 represents a substituent selected from the group consisting of H, C1-6-alkyl, fucosyl, methylfucosyl, sulfofucosyl, acetylfucosyl, arabinosyl, SO3H, SO3L1, SO3Na, SO3K, SO3N(C1-8alkyl)4 and R24;
• R9 represents a substituent selected from the group consisting of H, C1-6-alkyl, mannose, glycerol and R25;
• R21, R22, R23, R24 and R25 represent, independently of each other, a substituent selected from the group consisting of C(O)C1-6-alkyl, —C(S)C1-6-alkyl, —C(O)OC1-6-alkyl, —C(O)NH2, —C(S)NH2, —C(NH)NH2, —C(O)NHC1-6-alkyl, —C(S)NHC1-6-alkyl and —C(NH)NHC1-6-alkyl;
• and the possible geometrical or optical isomers, enantiomers or diastereoisomers, tautomers, salts, N-oxides, sulfoxides, sulfones, and metal or metalloid complexes thereof that are agriculturally acceptable.