[EN] BORON CONTAINING POLYBASIC BACTERIAL EFFLUX PUMP INHIBITORS AND THERAPEUTICS USES THEREOF [FR] INHIBITEURS DES POMPES À EFFLUX BACTÉRIENNES POLYBASIQUES CONTENANT DU BORE ET UTILISATIONS THÉRAPEUTIQUES DE CES DERNIERS
Two approaches to the use of benzo[c][1,2]oxaboroles as active fragments for synthetic transformation of clarithromycin
作者:Gennady B. Lapa、Elena P. Mirchink、Elena B Isakova、Maria N Preobrazhenskaya
DOI:10.1080/14756366.2016.1261129
日期:2017.1.1
Clarithromycin (active against Gram positive infections) and 1-hydroxy-1,3-dihydrobenzo[c][1,2] oxaborole derivatives (effective for Gram negative microbes) are the ligands of bacterial RNA. The antimicrobial activities of these benzoxaboroles linked with clarithromycin at 9 or 400 position were compared. Two synthetic pathways for these conjugates were elaborated. First pathway explored the substitution of the C-9 carbonyl group of macrolactone's cycle via oxime linker, the second direction used the modification of the 400-O-group of cladinose via the formation of carbamates of benzoxaboroles. 4''-O-(3-S-(1-Hydroxy-1,3-dihydro-benzo[c][1,2] oxaborole)-methyl-carbamoyl-clarithromycin showed twofold decrease in MICs for S. epidermidis and S. pneumoniae than clarithromycin. 4''-O-Modified clarithromycin demonstrated an efficacy against Gram positive strains only. Compounds with C-9 substitution were more active than 4''-O-substituted antibiotics for susceptible strains E. coli tolC and did not exceed the activity of initial antibiotics.