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Basicity of Heterocyclic Aromatic Amines

Basicity of Heterocyclic Aromatic Amines

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).

Five-Membered Heterocyclic Aromatic Compounds: Overview

Five-Membered Heterocyclic Aromatic Compounds: Overview

Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom, respectively.

Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship

Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship

Indirect-acting cholinergic agonists are agents that interact with the acetylcholinesterase enzyme in the synaptic cleft, preventing the breakdown of acetylcholine into choline and acetate. Consequently, the concentration of acetylcholine in the synaptic cleft increases. These agonists can be classified into reversible and irreversible inhibitors based on their duration of action.
Reversible inhibitors display short to medium durations of action. Short-acting agents include simple alcohols with...

Structure of Conjugated Dienes

Structure of Conjugated Dienes

Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...

Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship

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Cholinergic agonists or cholinomimetics mimic the action of acetylcholine to stimulate the parasympathetic nervous system. They are categorized into direct-acting and indirect-acting agents. The direct-acting cholinergic drugs induce the parasympathetic response by directly binding to the muscarinic or nicotine receptors. In comparison, the indirect-acting cholinergic drugs prevent acetylcholine hydrolysis, indirectly contributing to the extended parasympathetic response.
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Nomenclature of Aryl and Heterocyclic Amines

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The simplest aromatic amine is phenylamine, which contains an –NH2 functionality directly attached to an aromatic ring. The name aniline is designated for this skeleton. As shown in Figure 1, the common names of the functionalized anilines involve prefixes ortho-, meta-, and para- to indicate the substitution position. Different functionalized aniline derivatives also have notable trivial names.

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A Direct, Regioselective and Atom-Economical Synthesis of 3-Aroyl-N-hydroxy-5-nitroindoles by Cycloaddition of 4-Nitronitrosobenzene with Alkynones

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7-Pyridylindoles: synthesis, structure, and properties.

Maria Salvatora Mudadu¹, Ajay Singh, Randolph P Thummel

¹Department of Chemistry, University of Houston, Houston, Texas 77204-5003, USA.

The Journal of Organic Chemistry

|September 26, 2006

Summary

Researchers synthesized three isomeric 7-pyridylindoles (7-PIs) using Bartoli and Stille reactions. These compounds form pyridinium salts and zwitterions, with structures influenced by hydrogen bonding and aggregation, impacting their photophysical and NMR properties.

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Area of Science:

Organic Chemistry
Supramolecular Chemistry
Photophysics

Background:

7-pyridylindoles (7-PIs) are heterocyclic compounds with potential applications in materials science.
Understanding the structure-property relationships of isomeric systems is crucial for designing novel functional molecules.

Purpose of the Study:

To synthesize and characterize three isomeric 7-pyridylindoles (7-PIs) with varying pyridine attachments (C2, C3, C4).
To investigate the formation of pyridinium salts and zwitterionic species.
To analyze the photophysical, NMR, and crystallographic properties, including aggregation behavior.

Main Methods:

Bartoli indole synthesis and Stille coupling reactions for 7-PI preparation.
Methylation with CH(3)I to form pyridinium salts.
Deprotonation to generate zwitterions.
Photophysical measurements, NMR spectroscopy, and X-ray crystallography.

Main Results:

Successful synthesis of three isomeric 7-pyridylindoles (7-PIs).
Formation of pyridinium salts and zwitterions, with a neutral isomer observed for the 4-pyridyl system.
X-ray crystallography revealed distinct aggregation states driven by intra- and intermolecular hydrogen bonds.
Photophysical and NMR properties were characterized and discussed in relation to structural variations.

Conclusions:

The synthetic routes provide access to diverse 7-pyridylindole isomers.
Hydrogen bonding and aggregation significantly influence the solid-state structures and properties of these systems.
The study offers insights into the structure-property correlations of pyridylindole derivatives.