Related Experiment Video
Updated: May 28, 2026
09:08
From a Natural Product to Its Biosynthetic Gene Cluster: A Demonstration Using Polyketomycin from Streptomyces diastatochromogenes Tü6028
Published on: January 13, 2017
Total synthesis of pamamycin-649B
Petra Fischer1, Margit Gruner, Anne Jäger
1Fachrichtung Chemie und Lebensmittelchemie, Organische Chemie I, Technische Universität Dresden, Bergstrasse 66, 01069 Dresden, Germany.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|October 21, 2011
Summary
Researchers achieved the first total synthesis of pamamycin-649B, a macrodiolide antibiotic. This synthesis utilized novel sultone methodology and streamlined the process by leveraging C2
Area of Science:
- Organic Chemistry
- Medicinal Chemistry
Background:
- Pamamycin-649B is a macrodiolide antibiotic with potential therapeutic applications.
- The development of efficient synthetic routes is crucial for accessing and studying complex natural products like pamamycin-649B.
Purpose of the Study:
- To achieve the first total synthesis of the macrodiolide antibiotic pamamycin-649B.
- To develop and validate a novel sultone methodology for constructing the pamamycin-649B macrocycle.
Main Methods:
- Utilized sultone methodology for the synthesis.
- Employed domino elimination/alkoxide-directed 1,6-additions of ethyllithium to sultones.
- Performed intermolecular Yamaguchi esterification and Yamaguchi cyclization for macrocycle formation.
Main Results:
- Successfully synthesized pamamycin-649B (1) via a novel route.
- Constructed the diethyl substituted hydroxy acid fragment using sultone chemistry.
- Achieved macrocyclization through Yamaguchi esterification and cyclization.
Conclusions:
- The developed sultone methodology provides an efficient route to pamamycin-649B.
- The synthetic sequence was streamlined by utilizing the more readily available C2' epimeric smaller fragment due to complete C2' epimerization during lactonization.
Related Concept Videos
01:27Production of Antibiotics
Penicillin, one of the earliest and most widely used antibiotics, is produced industrially by the filamentous fungus Penicillium chrysogenum. Large stirred-tank bioreactors ranging from tens to hundreds of thousands of liters maintain tightly controlled temperature, pH, and dissolved oxygen conditions to support fungal metabolism and maximize antibiotic yield. Penicillin is a secondary metabolite, synthesized primarily during the stationary growth phase, which requires a carefully managed...
01:28Peptidoglycan Synthesis
Structure of PeptidoglycanPeptidoglycan is a vital structural component of the bacterial cell wall, providing mechanical strength and shape to the cell. It consists of repeating units of two sugars—N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM)—linked by β-1,4 glycosidic bonds. These sugar chains are cross-linked by short peptide chains, forming a mesh-like polymer that surrounds the bacterial plasma membrane.Cytoplasmic Phase – Precursor SynthesisPeptidoglycan biosynthesis begins in...
01:27Combined Effects of Drugs: Synergism
Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs.
Such synergistic combinations...
Such synergistic combinations...