[EN] SYNTHETIC COMPOUNDS USEFUL AS NODULATION AGENTS OF LEGUMINOUS PLANTS AND PREPARATION PROCESSES THEREOF<br/>[FR] COMPOSES SYNTHETIQUES UTILES COMME AGENTS DE NODULATION DES LEGUMINEUSES ET PROCEDES DE PREPARATION DE CES COMPOSES
申请人:BAYER CROPSCIENCE SA
公开号:WO2005063784A1
公开(公告)日:2005-07-14
The present invention relates to synthetic compounds that are active on plants, especially as legume nodulation factors, and also as plant growth stimulators, and to methods for preparing such compounds, which are of formula (I):'Veuillez insérer la formule chimique de la version papier' (I)
A totalsynthesis of a sulfated lipooligosaccharide, the nodulationsignal involved in the symbiosis of rhizobium meliloti-alfalfa, was achieved in a stereocontrolled manner.
A new synthesis of the fungallipo-chitooligosaccharideMyc-IV (C16:0, S), which was recently reported to be a major symbioticsignalling molecule in arbuscularmycorrhiza, is described. Key steps include the oxidative cleavage of a 4,6-O-benzylidene acetal to prepare a disaccharidic glycosyl acceptor, and stereoselective glycosylations with 2-methyl-5-tert-butylphenyl thioglycosyl donors.
Sulfonated and non-sulfonated lipo-chitooligosaccharides involved in Sinorhizobium meliloti–legume symbiosis are efficiently obtained on a multi mg scale by a 2-step procedure combining biotechnological and chemical approaches.