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Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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The basicity of aromatic amines is much weaker than that of aliphatic amines due to the involvement of the lone pair of electrons over the N atom in resonance with the aryl rings. Generally, the electron-donating ability of any substituents on the aryl ring of aromatic amines increases the basicity of the amine by increasing electron density, and hence the availability of lone pair on the nitrogen. On the other hand, electron-withdrawing functional groups on the aryl ring of amines decrease the...
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Amines with low molecular weight are usually gaseous at room temperature, while those with high molecular weight are liquid or solids in nature. Usually, low molecular weight amines have a rotten fish-like smell. Diamines typically have a pungent smell. For instance, cadaverine and putrescine, depicted in Figure 1, are two molecules responsible for decaying tissue.
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Determining protein-drug binding can be achieved through indirect and direct methods, each providing valuable insights into the interaction between proteins and drugs.
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Cation-π binding ability of BN indole.

Katherine Boknevitz1, Clovis Darrigan2, Anna Chrostowska2

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Researchers synthesized a novel BN indole scaffold to study cation-π interactions. This BN scaffold exhibits slightly reduced cation-π binding compared to natural indoles, impacting aromatic system interactions.

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Computational Chemistry

Background:

  • Cation-π interactions are crucial in biological and chemical systems.
  • Indole scaffolds are prevalent in nature and pharmaceuticals.
  • Understanding modifications to aromatic systems can reveal new binding properties.

Purpose of the Study:

  • To synthesize and characterize a boron-nitrogen (B-N) indole-containing aromatic scaffold.
  • To investigate the impact of incorporating a B-N bond on cation-π binding abilities.
  • To compare the binding characteristics of the B-N indole with the natural indole scaffold.

Main Methods:

  • Synthesis of a novel BN indole-containing aromatic scaffold.
  • Nuclear magnetic resonance (NMR) monitored titrations to characterize cation-π binding.
  • Non-linear curve fitting analysis of chemical shifts to determine association constants (Ka's).
  • Computational chemistry methods to support experimental findings.

Main Results:

  • Successful synthesis of the BN indole scaffold.
  • Quantification of cation-π binding abilities through NMR titrations.
  • Comparison of association constants revealed a slight decrease in binding for the BN indole compared to the natural indole.
  • Computational analysis corroborated the experimental observations.

Conclusions:

  • Incorporating a B-N bond instead of a C-C bond in an aromatic system subtly modulates its cation-π binding affinity.
  • The BN indole scaffold offers a modified platform for exploring cation-π interactions.
  • This research provides insights into the electronic effects of heteroatom incorporation on aromatic system binding properties.