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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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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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Accelerating spirocyclic polyketide synthesis using flow chemistry.

Sean Newton1, Catherine F Carter, Colin M Pearson

  • 1Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW (UK).

Angewandte Chemie (International Ed. in English)
|April 15, 2014
PubMed
Summary
This summary is machine-generated.

Synthetic chemistry and flow processing enable complex natural product synthesis. This study details the first total synthesis of spirodienal A and preparation of spirangien A methyl ester using novel flow-through methods.

Keywords:
flow chemistrynatural productsspirangien Aspirodienal Atotal synthesis

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Chemical Engineering

Background:

  • Flow processing has emerged as a powerful platform for molecular assembly in synthetic chemistry.
  • Its application to complex natural product synthesis remains an area of active development.

Purpose of the Study:

  • To demonstrate the extension of flow processing tools to complex natural product synthesis.
  • To achieve the first total synthesis of spirodienal A and prepare spirangien A methyl ester.

Main Methods:

  • Development of novel flow-through processes for key reactions in natural product synthesis.
  • Utilized iridium-catalyzed hydrogenation, iterative Roush crotylations, and gold-catalyzed spiroketalization.
  • Incorporated a late-stage cis-selective reduction within the flow system.

Main Results:

  • Successfully achieved the first total synthesis of spirodienal A.
  • Prepared spirangien A methyl ester using the developed flow methodologies.
  • Demonstrated the efficiency and applicability of flow processing for complex molecules.

Conclusions:

  • Flow processing offers a robust and efficient platform for tackling challenging natural product syntheses.
  • The developed novel flow-through reactions are valuable additions to the synthetic chemist's toolkit.
  • This work paves the way for broader adoption of flow chemistry in natural product synthesis.