Organophotoredox Catalysis: Visible-light-induced Multicomponent Synthesis of Chromeno[4, 3-b]chromene and Hexahydro-1H-xanthene Derivatives

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Author(s): Amit Kumar Sharma, Jyoti Tiwari, Deepali Jaiswal, Jaya Singh, Shailesh Singh, Jagdamba Singh*.

Journal Name: Current Organocatalysis

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Background: In recent years, photoredox catalysis using eosin Y has gained considerable significance in organic chemistry. It is evolving as a powerful approach in modern organic synthesis for the activation of small molecules.

Objective: The use of organic dyes to convert visible light into chemical energy by involving a single-electron transfer with organic substrates has innumerable applications.

Method and Results: The present strategy is the first example of visible light promoted, aerobic, oxidative cyclization of chromeno[4,3-b]chromenes and hexahydro-1H-xanthenes via the formation of C–O and C–C bonds to afford excellent yield of the products in a simple one-pot operation under mild reaction conditions.

Conclusion: The major advantages of the present methodology include short reaction time, cost effectiveness, easy work-up, broad substrate scope and high atom economy.

Keywords: Visible Light, Photoredox catalysis, Multicomponent, Chromeno[4, 3-b]chromenes, hexahydro-1H-xanthene

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(E-pub Ahead of Print)
DOI: 10.2174/2213337206666190306154327