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Visible-Light-Mediated Three-Component Cascade Sulfonylative Annulation.

Ganesh Chandra Upreti1, Tavinder Singh1, Sudhir Ranjan2

  • 1Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India.

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|September 5, 2022
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Summary
This summary is machine-generated.

Visible-light photochemistry enables a new method for synthesizing sulfonylated polyaromatics. This transition-metal-free approach uses a three-component reaction for rapid molecular complexity, offering an efficient route to valuable compounds.

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Area of Science:

  • Organic Chemistry
  • Photochemistry
  • Synthetic Methodology

Background:

  • Visible-light photoredox catalysis has emerged as a powerful tool in organic synthesis.
  • Cascade reactions offer efficient pathways to complex molecules by forming multiple bonds in a single operation.
  • Sulfonylated polyaromatic compounds possess diverse applications in materials science and medicinal chemistry.

Purpose of the Study:

  • To develop a novel, transition-metal-free method for synthesizing sulfonylated benzimidazo/indolo[2,1-a]iso-quinolin-6(5H)-ones.
  • To establish a visible-light-promoted cascade radical cyclization strategy.
  • To provide rapid access to complex sulfonylated polyaromatic structures.

Main Methods:

  • A three-component photochemical reaction was employed.
  • Visible light irradiation was used to initiate the cascade radical cyclization.
  • Sodium metabisulfite served as a sulfur dioxide (SO2) surrogate.

Main Results:

  • The developed protocol successfully synthesized various sulfonylated benzimidazo/indolo[2,1-a]iso-quinolin-6(5H)-ones.
  • The reaction proceeded efficiently under transition-metal-free conditions.
  • The method demonstrated rapid generation of molecular complexity.

Conclusions:

  • A novel and efficient visible-light-promoted cascade radical cyclization has been established for the synthesis of sulfonylated polyaromatics.
  • This methodology offers a practical and expeditious route to complex molecular architectures.
  • The use of sodium metabisulfite as an SO2 surrogate highlights the utility of readily available reagents in photochemical synthesis.