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Protein Folding01:22

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Aromatic Hydrocarbon Anions: Structural Overview01:18

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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Development of Aromatic Foldamer Building Blocks Bearing Multiple Biogenic Side Chains.

Márton Zwillinger1, Petra Sőregi1,2, Florian Sanchez3

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Researchers developed a new method to create aromatic oligoamide foldamers with enhanced side chain density. This advance aids in designing molecules for improved protein recognition in drug discovery.

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Area of Science:

  • Medicinal Chemistry
  • Organic Synthesis
  • Supramolecular Chemistry

Background:

  • Aromatic oligoamides possess inherent rigidity and defined structures, showing promise in medical applications.
  • Naturally occurring antibiotics feature similar structures, highlighting their potential for protein and B-DNA binding.
  • Current research aims to improve molecular recognition capabilities for drug discovery.

Purpose of the Study:

  • To develop a synthetic strategy for quinoline amino acid monomers with diverse side chains.
  • To enhance side chain density on helical foldamers for improved protein surface recognition.
  • To mimic the dense side chain presentation of alpha-peptides.

Main Methods:

  • Synthesized quinoline amino acid monomers with varied side chains at positions 4, 5, and 6.
  • Utilized cross-coupling reactions for efficient side chain functionalization.
  • Optimized the process for automated solid-phase synthesis.

Main Results:

  • Successfully produced a 20-unit aromatic oligoamide foldamer with high purity.
  • Demonstrated the incorporation of diverse cationic, anionic, polar, and hydrophobic side chains.
  • Validated the potential for molecular recognition applications.

Conclusions:

  • The novel synthetic approach advances the construction of aromatic oligoamide foldamers.
  • The developed foldamers offer a robust platform for drug discovery and therapeutic applications.
  • This methodology enables precise control over side chain presentation for targeted molecular interactions.