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Basicity of Heterocyclic Aromatic Amines01:25

Basicity of Heterocyclic Aromatic Amines

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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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Nomenclature of Aryl and Heterocyclic Amines01:10

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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Bacterial Transformation01:33

Bacterial Transformation

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In 1928, bacteriologist Frederick Griffith worked on a vaccine for pneumonia, which is caused by Streptococcus pneumoniae bacteria. Griffith studied two pneumonia strains in mice: one pathogenic and one non-pathogenic. Only the pathogenic strain killed host mice.
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Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

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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,...
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Acid-Catalyzed Ring-Opening of Epoxides02:24

Acid-Catalyzed Ring-Opening of Epoxides

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Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
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Base-Catalyzed Ring-Opening of Epoxides02:26

Base-Catalyzed Ring-Opening of Epoxides

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Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...
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Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
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Gold-catalyzed post-MCR transformations towards complex (poly)heterocycles.

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Post multicomponent reaction transformations, like the Ugi reaction, create diverse molecular structures. Recent advancements, especially with gold catalysis, enhance these reactions for drug discovery.

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Area of Science:

  • Organic Chemistry
  • Medicinal Chemistry
  • Catalysis

Background:

  • Multicomponent reactions (MCRs) are powerful tools for generating molecular complexity and diversity.
  • The Ugi reaction, a prominent MCR, yields linear peptide backbones amenable to further modification.
  • Post-Ugi transformations are crucial for rigidifying Ugi adducts into drug-like molecules.

Purpose of the Study:

  • To review recent advancements in post-Ugi transformations over the past decade.
  • To highlight modifications performed sequentially or in domino fashion.
  • To emphasize synthetic applications and mechanistic insights of derived products.

Main Methods:

  • Focus on sequential and domino transformations.
  • Integration of gold catalysis in post-Ugi reactions.
  • Review of synthetic strategies and mechanistic studies.

Main Results:

  • Significant expansion in developing new structural frameworks via post-Ugi reactions.
  • Demonstrated high performance and versatility, particularly with gold catalysis.
  • Successful application of these transformations in synthesizing complex molecules.

Conclusions:

  • Post-Ugi transformations, especially gold-catalyzed ones, offer versatile routes to complex molecular architectures.
  • These methods provide elegant solutions for rigidifying Ugi adducts, enhancing their drug-likeness.
  • Continued development promises further innovation in synthetic chemistry and drug discovery.