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A modular approach to the potent, broad-spectrum antibiotic amycolamicin and seven diastereomeric analogues is described. The synthesis features bioinspired construction of the high-carbon amycolose segment, gold(I)-catalyzed high-yielding -glycosylation of the -decalin scaffold, -glycosylation of the bromoacetylated l-valine derivative, and condition-tuned late-stage -acylation of the tetramic acid motif. An assessment of the antibacterial properties of these synthetic molecules indicated that the correct stereochemistry is essential for the potent bioactivity of amycolamicin.
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http://dx.doi.org/10.1021/acs.orglett.5c00742 | DOI Listing |
J Nat Prod
August 2025
Fundación MEDINA, Parque Tecnológico de Ciencias de la Salud, 18016 Granada, Spain.
Kibdelomycin and amycolamicin are identical antibiotics produced by CA-240109 and sp. MK575-fF5, respectively. They are broad-spectrum antibiotics showing potent activity against antibiotic-resistant Gram-positive bacteria.
View Article and Find Full Text PDFOrg Lett
April 2025
State Key Laboratory of Chemical Biology, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai 200032, China.
A modular approach to the potent, broad-spectrum antibiotic amycolamicin and seven diastereomeric analogues is described. The synthesis features bioinspired construction of the high-carbon amycolose segment, gold(I)-catalyzed high-yielding -glycosylation of the -decalin scaffold, -glycosylation of the bromoacetylated l-valine derivative, and condition-tuned late-stage -acylation of the tetramic acid motif. An assessment of the antibacterial properties of these synthetic molecules indicated that the correct stereochemistry is essential for the potent bioactivity of amycolamicin.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
January 2025
National Institute of Biological Sciences, Beijing, 7 Science Park Road ZGC Life Science Park, Beijing, 102206, P.R. China.
Kibdelomycin (KBD) and amycolamicin (AMM) are potent natural antibiotics effective against antibiotic-resistant Gram-positive pathogens, including vancomycin-intermediate Staphylococcus aureus (S. aureus, VISA), methicillin-resistant S. aureus (MRSA), and quinolone-resistant S.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
August 2022
Department of Chemistry, Scripps Research, 10550N. Torrey Pines Road, La Jolla, CA 92122, USA.
A modular total synthesis of kibdelomycin is disclosed that should enable structure-activity relationship (SAR) studies of this interesting class of antibiotics. The route uses simple building blocks and addresses lingering questions about its structural assignment and relationship to amycolamicin, a recently described natural product reported to have a similar structure. Initial antibacterial assays reveal that both C-22 epimers (the N-glycosidic linkage) of the natural product have similar activity while structurally truncated analogs lose activity.
View Article and Find Full Text PDFJ Am Chem Soc
March 2022
Graduate School of Agricultural Science, Tohoku University, 468-1 Aramaki-Aza-Aoba, Aoba-ku, Sendai 980-0845, Japan.
The total synthesis of the antibiotic amycolamicin with a hybrid molecular architecture composed of five ring systems, which exhibits potent antibacterial activity against a wide range of drug-resistant bacteria, has been achieved in a convergent manner. A protecting-group-free intramolecular Diels-Alder reaction of a hydroxy tetraenal intermediate promoted by two equivalents of EtAlCl, which proceeds highly diastereoselectively via an -equatorial transition state, has been utilized to construct the -decalin moiety of the molecule. The full structure of amycolamicin was assembled by a completely stereoconvergent N-acylation of a northern -glycoside unit (α-anomer/β-anomer = 1:1.
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