Volume 42, Issue 4 pp. 363-369
Concise Report

Cobalt-Catalyzed Switchable [4 + 1] and [4 + 1 + 1] Spirocyclization of Aromatic Amides with 2-Diazo-1H-indene-1,3(2H)-dione: Access to Spiro Indene-2,1'-isoindolinones and Spiro Isochroman-3,1'-isoindolinones

Bin Li

Corresponding Author

Bin Li

State Key Laboratory of Antiviral Drugs, Pingyuan Laboratory, Key Laboratory of Green Chemical Media and Reactions, Key Laboratory for Yellow River and Huai River Water Environmental Pollution Control, Ministry of Education, School of Environment, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007 China

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Mengmeng Xie

Mengmeng Xie

State Key Laboratory of Antiviral Drugs, Pingyuan Laboratory, Key Laboratory of Green Chemical Media and Reactions, Key Laboratory for Yellow River and Huai River Water Environmental Pollution Control, Ministry of Education, School of Environment, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007 China

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Jingyu Li

Jingyu Li

State Key Laboratory of Antiviral Drugs, Pingyuan Laboratory, Key Laboratory of Green Chemical Media and Reactions, Key Laboratory for Yellow River and Huai River Water Environmental Pollution Control, Ministry of Education, School of Environment, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007 China

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Nana Shen

Nana Shen

State Key Laboratory of Antiviral Drugs, Pingyuan Laboratory, Key Laboratory of Green Chemical Media and Reactions, Key Laboratory for Yellow River and Huai River Water Environmental Pollution Control, Ministry of Education, School of Environment, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007 China

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Xinying Zhang

Xinying Zhang

State Key Laboratory of Antiviral Drugs, Pingyuan Laboratory, Key Laboratory of Green Chemical Media and Reactions, Key Laboratory for Yellow River and Huai River Water Environmental Pollution Control, Ministry of Education, School of Environment, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007 China

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Xuesen Fan

Corresponding Author

Xuesen Fan

State Key Laboratory of Antiviral Drugs, Pingyuan Laboratory, Key Laboratory of Green Chemical Media and Reactions, Key Laboratory for Yellow River and Huai River Water Environmental Pollution Control, Ministry of Education, School of Environment, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007 China

E-mail: [email protected]; [email protected]Search for more papers by this author
First published: 02 October 2023
Citations: 2

Comprehensive Summary

Herein, we report a condition-controlled divergent synthesis of spiro indene-2,1'-isoindolinones and spiro isochroman-3,1'-isoindolinones through cobalt-catalyzed formal [4 + 1] and [4 + 1 + 1] spirocyclization of aromatic amides with 2-diazo-1H-indene-1,3(2H)- dione. When the reaction is carried out under air in ethyl acetate, spiro indene-2,1'-isoindolinones are formed through Co(II)-catalyzed C—H/N—H [4 + 1] spirocyclization. When the reaction is run under O2 in CH3CN, on the other hand, spiro isochroman-3,1'-isoindolinones are generated through Baeyer-Villiger oxidation of the in situ formed spiro indene-2,1'-isoindolinones with O2 as a cheaper and environmental-friendly oxygen source. In general, these protocols have advantages such as using non-precious and earth-abundant metal catalyst, no extra additive, high efficiency and regioselectivity. A gram-scale synthesis and the removal of the directing group further highlight its utility.image

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