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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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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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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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Heterocycles from methylenecyclopropanes.

Lei Yu1, Mingxuan Liu, Fenglin Chen

  • 1Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China. yulei@yzu.edu.cn.

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Methylenecyclopropanes (MCPs) are versatile building blocks for synthesizing complex molecules. This review highlights recent novel reactions for creating heterocycles from MCPs, offering powerful new synthetic tools.

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Area of Science:

  • Synthetic organic chemistry
  • Organic reaction methodology

Background:

  • Methylenecyclopropanes (MCPs) have gained prominence as key building blocks in organic synthesis over the last 20 years.
  • The synthesis of heterocycles from MCPs has emerged as a significant area, offering efficient routes to complex substituted products.
  • Existing reviews on heterocycle synthesis from MCPs are scarce, with the last major monograph published over a decade ago.

Purpose of the Study:

  • To provide a comprehensive summary of recent advancements in the synthesis of heterocycles utilizing methylenecyclopropanes.
  • To highlight novel organic reactions and methodologies involving MCPs for heterocycle construction.
  • To address the need for updated reviews in this rapidly evolving field of synthetic organic chemistry.

Main Methods:

  • Literature review of recent publications (past few years) focusing on reactions involving methylenecyclopropanes.
  • Analysis and categorization of novel synthetic methodologies for heterocycle formation from MCPs.
  • Synthesis of specific examples to illustrate the discussed reactions and their scope.

Main Results:

  • Identification of a range of new organic reactions enabling the efficient synthesis of diverse heterocycles from MCPs.
  • Demonstration of MCPs as powerful synthons for accessing elaborately substituted heterocyclic compounds.
  • Compilation of methodologies that offer significant advantages in terms of speed, efficiency, and product complexity.

Conclusions:

  • Recent novel reactions involving methylenecyclopropanes provide powerful and specific tools for modern organic synthesis.
  • The reviewed methodologies expand the synthetic utility of MCPs, particularly in the construction of complex heterocyclic frameworks.
  • This review serves as an essential update for researchers in synthetic organic chemistry, particularly those focused on heterocycle synthesis.