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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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This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
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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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In the presence of an aqueous base and a halogen, primary amides can lose the carbonyl (as carbon dioxide) and undergo rearrangement to form primary amines. This reaction, called the Hofmann rearrangement, can produce primary amines (aryl and alkyl) in high yields without contamination by secondary and tertiary amines.
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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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Prochirality

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The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
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Modular Approach to Highly Substituted 3-Methylpyridones.

Yan Zhang1, Hui Chen1, Lianyou Zheng1

  • 1The Center for Combinatorial Chemistry and Drug Discovery of Jilin University, The School of Pharmaceutical Sciences, Jilin University, 1266 Fujin Road, Changchun, Jilin 130021, P. R. China.

The Journal of Organic Chemistry
|May 3, 2024
PubMed
Summary

A new method rapidly synthesizes 3-methylpyridones using readily available starting materials and benzoic acid catalysis. This efficient process offers broad applications in biological research, therapeutics, and material sciences.

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry

Background:

  • 3-Methylpyridones are valuable heterocyclic compounds with diverse applications.
  • Existing synthesis methods may lack efficiency or broad applicability.

Purpose of the Study:

  • To develop a rapid and efficient method for synthesizing highly substituted 3-methylpyridones.
  • To explore the utility of Baylis-Hillman amines and ketones in this synthesis.

Main Methods:

  • Condensation reaction between Baylis-Hillman amines and ketones.
  • Utilized benzoic acid as a catalyst.
  • Optimized reaction conditions for efficiency and yield.

Main Results:

  • Achieved rapid synthesis of highly substituted 3-methylpyridones.
  • Demonstrated broad substrate scope and high functional group tolerance.
  • Successfully performed gram-scale synthesis with excellent regioselectivity.

Conclusions:

  • The developed method provides an on-demand construction of 3-methylpyridones.
  • This approach offers significant opportunities for biological research, drug discovery, and material science.
  • The process is efficient, scalable, and utilizes accessible starting materials.