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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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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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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
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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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A versatile route towards 6-arylpipecolic acids.

Erich Gebel1, Cornelia Göcke1, Carolin Gruner1

  • 1Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Universitätsstraße 25, D-33615 Bielefeld, Germany.

Beilstein Journal of Organic Chemistry
|June 12, 2025
PubMed
Summary

Researchers developed a novel method to create enantiomerically pure pipecolic acid derivatives. This technique utilizes the chiral pool and cross-coupling reactions for peptide design and conformational studies.

Keywords:
Suzuki–Miyaura cross-couplingconformational restraintsdihedral angle NMRhalf-chair conformationmodified amino acidspipecolic acidstereoselective hydrogenation

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Area of Science:

  • Organic Chemistry
  • Medicinal Chemistry
  • Structural Biology

Background:

  • Pipecolic acid is a non-proteinogenic amino acid known for its secondary structure-inducing properties.
  • Its six-membered ring structure is valuable in designing peptide conformations.
  • Existing methods for synthesizing modified pipecolic acid derivatives can be limited.

Purpose of the Study:

  • To develop an improved method for synthesizing enantiomerically pure pipecolic acid derivatives with C6 aryl modifications.
  • To utilize the chiral pool of non-proteinogenic amino acids in this synthesis.
  • To investigate the conformational properties of the synthesized compounds using NMR analysis.

Main Methods:

  • Chiral pool synthesis utilizing a non-proteinogenic amino acid.
  • Transition metal-catalyzed cross-coupling reactions for C6 aryl modification.
  • In-depth Nuclear Magnetic Resonance (NMR) analysis of intermediates and products.

Main Results:

  • Successful generation of enantiomerically pure pipecolic acid derivatives with aryl substituents at the C6 position.
  • Detailed NMR analysis confirmed the conformational constraints of the synthesized molecules.
  • Coupling constants and dihedral angles provided insights into the molecular conformation.

Conclusions:

  • The presented method offers an efficient route to enantiomerically pure, conformationally constrained pipecolic acid derivatives.
  • This advancement is beneficial for peptide design and understanding structure-activity relationships.
  • The study highlights the utility of combining chiral pool strategies with modern catalytic methods.