Ball-, Bowl-, and belt-shaped conjugated systems and their complexing abilities: Exploration of the concave-convex [pi]-[pi] interaction

Article Abstract:

A study surveys the supramolecular properties of the curved conjugated systems possessing a ball-shaped, bowl-shaped, or belt-shaped structure to explore the nature of the concave-convex [pi]-[pi] interaction. Results suggest that the [pi]-[pi] stacking between planar aromatic hydrocarbons causes an electrostatically repulsive force and prove the substantial difference of electronic properties between planar and curved conjugated systems.

Industrial Organic Chemicals, Cyclic Crude and Intermediate Manufacturing, Aromatic Hydrocarbons, Analysis, Electron configuration, Atomic properties

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Synthetic studies of biologically active marine cyclopeptides

Article Abstract:

The cyclopeptides and cyclodepsipeptides Lissoclinum peptides, didemnins, diazonamides, cyclotheonamides, jaspamide and geodiamolides are obtained from ascidians and sponges. The cytotoxicity, tumor promotion, anticancer, antiviral and antiinflammatory functionals are restored in the extracts from ascidians and other tunicates. The Lissoclinum peptide metabolites, ulicyclamide and ascidacyclamide, are synthesized.

Research, Usage, Peptides, Ascidiacea, Sea squirts, Peptide synthesis, Sponges, Sponges (Animals)

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Recent progress of the synthetic studies of biologically active marine cyclic peptides and depsipeptides

Article Abstract:

Progress made in the synthetic studies of marine cyclic peptides and depsipeptides, which have unique structures and interesting biological activities, is described. New methods, reagents and catalysts needed for simple and suitable larger scale synthesis are discussed.

Marine bacteria, Biosynthesis, Structure

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