Decarboxylative Radical Addition to Methylideneoxazolidinones for Stereocontrolled Synthesis of Selectively Protected Diamino Diacids
作者:Yu-Ting Hsiao、Jonathan Beadle、Cameron Pascoe、Ritesh Annadate、John C. Vederas
DOI:10.1021/acs.orglett.1c02684
日期:2021.9.17
can be achieved by redox decarboxylation of distal N-hydroxyphthalimide esters of protected aspartic, glutamic or α-aminoadipic acids via radical addition to methylideneoxazolidinones. The products are useful for solid-supported syntheses of robust bioactive carbocyclic peptide analogs. Yields of reactive primary radical addition are superior to those of more stabilized radicals, and the reaction fails
Synthesis of a Glycopeptide Vaccine Conjugate for Induction of Antibodies Recognizing O-Mannosyl Glycopeptides
作者:Jin Yu、Ulrika Westerlind
DOI:10.1002/cbic.201300537
日期:2014.5.5
Sugars from the brain: The chemical synthesis and immunization of a glycopeptide vaccine construct containing the common O‐mannose motif Galβ1‐4GlcNAcβ1‐2ManαThr was accomplished to generate antibody‐based tools for enrichment, detection, and identification of mammalian O‐mannosyl glycoproteins and glycopeptides.
This makes glycopeptides an interesting class of compounds for medical applications. To enhance the long‐term availability of these molecules in vivo, the stabilization of the glycosidic bond between the aminoacid residue and the carbohydrate is of interest. The described modular approach affords β‐linked C‐glycosyl aminoacids by a sequence of Petasis olefination of glyconolactones, stereoselective
The effect of replacing the ester bond with an amide bond and of overall stereochemistry on the activity of daptomycin
作者:Ryan Moreira、Ghufran Barnawi、David Beriashvili、Michael Palmer、Scott D. Taylor
DOI:10.1016/j.bmc.2018.12.004
日期:2019.1
daptomycin’s activity. ent-Dap-K6-E12-W13 was found to be at least 133-fold less active than Dap-K6-E12-W13, indicating that a chiral interaction with a chiral target is essential to daptomycin’s activity. Studies examining the binding of Dap-K6-E12-W13 and ent-Dap-K6-E12-W13 to model liposomes consisting of phosphatidylglycerol (PG) and phosphatidylcholine suggest that the stereochemistry of PG plays
Glycal Glycosylation and 2-Nitroglycal Concatenation, a Powerful Combination for Mucin Core Structure Synthesis
作者:Jürgen Geiger、B. Gopal Reddy、Gottfried A. Winterfeld、R. Weber、M. Przybylski、R. R. Schmidt
DOI:10.1021/jo061670b
日期:2007.6.1
3-O-glycosylated with O-(galactopyranosyl) trichloroacetimidates; depending on the protecting group pattern stereoselectively α- and β-linked disaccharides were obtained. With O-(2-azido-2-deoxyglucopyransyl) trichloroacetimidate as donor (compound 10A), glycosylation of 2 and of a 6-O-unprotected galactal derivative led in acetonitrile as solvent exclusively to a β(1−3)- and a β(1−6)-linked disaccharide, respectively