Related Experiment Video
Updated: Sep 2, 2025
06:15
Interactive Molecular Model Assembly with 3D Printing
Published on: August 13, 2020
10.2K
Assembling the carbon skeleton of A-74528
Martin S Maier1,2, Andrej Shemet2, Dirk Trauner1,2
1Department of Chemistry, Ludwig Maximilian University of Munich 81377 Munich Germany.
Chemical Science
|August 3, 2022
Summary
Researchers synthesized the complex polyketide A-74528, a 2'-phosphodiesterase inhibitor. The study successfully constructed its full carbon skeleton and most stereocenters, overcoming significant synthetic challenges.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
- Natural Product Synthesis
Background:
- A-74528 is a complex type II polyketide with unusual biological activity as a 2 phosphodiesterase inhibitor.
- Its intricate structure, featuring a hexacarbocyclic core and appended pyrone, presents a significant synthetic challenge.
Purpose of the Study:
- To report the synthetic efforts toward the complex natural product A-74528.
- To construct the full carbon skeleton and install stereocenters of A-74528.
Main Methods:
- Utilized molybdenum-catalyzed branched allylation to form the central quaternary carbon.
- Employed spiro epoxide annulation, 1,3-dipolar cycloaddition, aldol condensation, and gold-catalyzed hydroarylation for carbocycle construction.
- Appended the pyrone ring via one-carbon homologation and Mukaiyama aldol addition.
Main Results:
- Successfully constructed the complete carbon skeleton of A-74528.
- Achieved correct installation of all but one stereocenter.
- Demonstrated a viable strategy for synthesizing complex polyketides.
Conclusions:
- The reported strategy provides a robust pathway for the synthesis of A-74528.
- Highlights the utility of specific catalytic methods in complex molecule synthesis.
- Advances the field of polyketide synthesis and natural product chemistry.
Related Concept Videos
01:12Carbon Skeletons
108.9K
Life on Earth is carbon-based, as all macromolecules that make up living organisms contain carbon atoms. All organic compounds have a carbon backbone. Each carbon atom is tetravalent and can bond with four other atoms, making it an extraordinarily flexible component of biological molecules. Because carbon’s valence electrons are stable, it rarely becomes an ion. As the carbon chain increases in length, structural modifications such as ring structures, double bonds, and branching side...
108.9K
01:18Assembly of Cytoskeletal Filaments
21.3K
Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
21.3K
01:32Assembly of Complex Microtubule Structures
1.9K
Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
1.9K
02:41Protein Complex Assembly
10.8K
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
10.8K
01:24Oligosaccharide Assembly
3.0K
Protein glycosylation starts in the ER lumen and continues in the Golgi apparatus. Glycosyltransferases catalyze the addition of sugar molecules or glycosylation of proteins. Usually, these enzymes add sugars to the hydroxyl groups of selected serine or threonine residues to form O-linked glycans or the amino groups of asparagine residues to form N-linked glycans. Different positions on the same polypeptide chain can contain differently linked glycans.
Multiple sugar molecules that may or may...
Multiple sugar molecules that may or may...
3.0K
01:35Disassembly of Intermediate Filaments
2.1K
Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
2.1K