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In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
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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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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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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
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A strained ring for stereoselective synthesis.

Christian L Jankovic1, F G West1

  • 1Department of Chemistry, University of Alberta, E3-43 Gunning-Lemieux Chemistry Centre, Edmonton, AB, Canada.

Science (New York, N.Y.)
|January 19, 2023
PubMed
Summary
This summary is machine-generated.

Cyclic allenes, featuring spring-loaded tension, accelerate the creation of complex natural products. This discovery offers a novel synthetic strategy for chemists.

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Natural Product Synthesis

Background:

  • Cyclic allenes are strained molecules with unique reactivity.
  • Natural product synthesis often requires efficient and innovative methodologies.

Purpose of the Study:

  • To investigate the utility of spring-loaded tension in cyclic allenes for accelerating synthesis.
  • To demonstrate the application of this strategy in the construction of a natural product.

Main Methods:

  • Utilized a strained cyclic allene precursor.
  • Employed specific reaction conditions to harness the inherent tension.
  • Characterized the synthesized natural product using spectroscopic techniques.

Main Results:

  • The spring-loaded tension of the cyclic allene significantly expedited the synthetic route.
  • Successfully synthesized the target natural product with improved efficiency.
  • Identified key intermediates and reaction pathways.

Conclusions:

  • Spring-loaded tension in cyclic allenes is a powerful tool for accelerating organic synthesis.
  • This approach provides a valuable strategy for the efficient construction of natural products.