Application of Highly Stereocontrolled Glycosidations Employing 2,6-Anhydro-2-thio Sugars to the Syntheses of Erythromycin A and Olivomycin A Trisaccharide
摘要:
The highly efficient syntheses of the erythromycin A (1) from its aglycon, (9S)-9-dihydroerythronolide A (4), and the C-D-E trisaccharide 3 of olivomycin A have been accomplished by the successful application of stereocontrolled glycosidations using 2,6-anhydro-2-thio sugars. The former synthesis includes the highly alpha-stereoselective glycosidation of the C5 desosaminated lactone 12 with phenyl 2,6-anhydro-4-O-benzyl-3-C-methyl-3-O-methyl-1 ,2-dithio-L-altropyranoside (10), which was achieved by using NIS-TfOH. The latter synthesis involves both the highly beta-stereoselective glycosidation of 1,3-di-O-acetyl-2,6-anhydro-4-O-benzyl-2-thio-beta-D-altropy (23), which was realized by employing TMSOTf, and the highly alpha-stereoselective glycosidation of phenyl 2,6-anhydro-3-O-(diethylisopropylsilyl) -4-O-isobutyryl-3-C-methyl-1,2-dithio-L-manno-pyranoside (24), which succeeded by utilizing NBS. Hydrogenolyses using Raney Ni as a catalyst and selective deprotections of the key glyco substances 17 and 22 led to the total syntheses of erythromycin A (1) and the C-D-E trisaccharide 3 of olivomycin A, respectively.
Desmethyl Macrolides: Synthesis and Evaluation of 4,8-Didesmethyl Telithromycin
作者:Bharat Wagh、Tapas Paul、Ian Glassford、Charles DeBrosse、Dorota Klepacki、Meagan C. Small、Alexander D. MacKerell、Rodrigo B. Andrade
DOI:10.1021/ml300230h
日期:2012.12.13
sources of antibiotics to address the incessant and inevitable onset of bacterial resistance. To this end, we have initiated a structure-based drug design program that features a desmethylation strategy (i.e., replacing methyl groups with hydrogens). Herein we report the totalsynthesis, molecular modeling and biologicalevaluation of 4,8-didesmethyl telithromycin (5), a novel desmethyl analogue of the
[EN] AZITHROMYCIN ANTIMICROBIAL DERIVATIVES WITH NON-ANTIBIOTIC PHARMACEUTICAL EFFECT<br/>[FR] DÉRIVÉS ANTIMICROBIENS D'AZITHROMYCINE À EFFET PHARMACEUTIQUE NON ANTIBIOTIQUE
申请人:PROBIOTIC PHARMACEUTICALS APS
公开号:WO2014166503A1
公开(公告)日:2014-10-16
The invention provides molecules, which are based on a modification of azithromycin, removing the antibiotic effect, while retaining other beneficial effects, such as, but not limited to imunomodulatory effects. The compounds of the invention can be described by compounds of Formula (I) as further defined herein.
The quaternary king: Azithromycin (1), which has improved pharmacological profiles compared with erythromycins, was the target of an enantioselective synthesis. All the stereogenic quaternary carbon centers were elaborated by a desymmetrization of 2‐substituted glycerols using a chiral imine/CuCl2 catalyst.
Desmethyl Macrolides: Synthesis and Evaluation of 4,8,10-Tridesmethyl Cethromycin
作者:Bharat Wagh、Tapas Paul、Charles DeBrosse、Dorota Klepacki、Meagan C. Small、Alexander D. MacKerell、Rodrigo B. Andrade
DOI:10.1021/ml400337t
日期:2013.11.14
methyl groups with hydrogens) analogues of third-generation macrolide drugs telithromycin (TEL, 2) and cethromycin (CET, 6), both of which are semisynthetic derivatives of flagship macrolide antibiotic erythromycin (1). Herein, we report the totalsynthesis, molecular modeling, and biologicalevaluation of 4,8,10-tridesmethyl cethromycin (7). In MIC assays, CET analogue 7 was found to be equipotent
Desmethyl Macrolides: Synthesis and Evaluation of 4-Desmethyl Telithromycin
作者:Ian Glassford、Miseon Lee、Bharat Wagh、Venkata Velvadapu、Tapas Paul、Gary Sandelin、Charles DeBrosse、Dorota Klepacki、Meagan C. Small、Alexander D. MacKerell、Rodrigo B. Andrade
DOI:10.1021/ml5002097
日期:2014.9.11
sources of antibiotics are needed to address the serious threat of bacterial resistance. Accordingly, we have launched a structure-based drug design program featuring a desmethylation strategy wherein methyl groups have been replaced with hydrogens. Herein we report the totalsynthesis, molecular modeling, and biologicalevaluation of 4-desmethyl telithromycin (6), a novel desmethyl analogue of the third-generation