Controllable synthesis of benzoxazinones and 2-hydroxy-3-indolinones by visible-light-promoted 5-endo-dig N-radical cyclization cascade

In recent years, significant advances have been made on photoredox-catalyzed N-radical addition to C-C unsaturated bond via N-H bond cleavage. However, these N-centered radical additions have so far been mostly limited to the alkenes, and to our knowledge, N-radical 5-endo-dig cyclizations of alkyne...

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Published inCell reports physical science Vol. 2; no. 10; p. 100577
Main Authors Tan, Tong-De, Zhai, Tong-Yi, Liu, Bin-Yang, Li, Long, Qian, Peng-Cheng, Sun, Qing, Zhou, Jin-Mei, Ye, Long-Wu
Format Journal Article
LanguageEnglish
Published Elsevier Inc 20.10.2021
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Abstract In recent years, significant advances have been made on photoredox-catalyzed N-radical addition to C-C unsaturated bond via N-H bond cleavage. However, these N-centered radical additions have so far been mostly limited to the alkenes, and to our knowledge, N-radical 5-endo-dig cyclizations of alkynes have been less exploited. Herein, we disclose an 5-endo-dig N-radical cascade cyclization of o-ethynylacetamides by photoredox catalysis involving rare radical cleavage of C-C triple bond, allowing the practical and controllable synthesis of a diverse array of valuable benzoxazinones and 2-hydroxy-3-indolinones in moderate to good yields under mild conditions. Furthermore, a mechanistic rationale for this radical cyclization cascade is supported by various control experiments and theoretical calculations. [Display omitted] •N-radical 5-endo-dig cyclization-initiated cascade reaction•Photoredox-catalyzed N-radical addition to C-C triple bond•C-C triple bond cleavage•Controllable and practical synthesis of diverse heterocycles Tan et al. describe a practical radical cascade reaction via photoredox-catalyzed N-centered radical addition to C-C triple bond, which represents the first N-radical 5-endo-dig cyclization cascade, to the best of their knowledge. This method enables the efficient and controllable synthesis of functionalized benzoxazinones and 2-hydroxy-3-indolinones with wide substrate scope under mild reaction conditions.
AbstractList In recent years, significant advances have been made on photoredox-catalyzed N-radical addition to C-C unsaturated bond via N-H bond cleavage. However, these N-centered radical additions have so far been mostly limited to the alkenes, and to our knowledge, N-radical 5-endo-dig cyclizations of alkynes have been less exploited. Herein, we disclose an 5-endo-dig N-radical cascade cyclization of o-ethynylacetamides by photoredox catalysis involving rare radical cleavage of C-C triple bond, allowing the practical and controllable synthesis of a diverse array of valuable benzoxazinones and 2-hydroxy-3-indolinones in moderate to good yields under mild conditions. Furthermore, a mechanistic rationale for this radical cyclization cascade is supported by various control experiments and theoretical calculations. [Display omitted] •N-radical 5-endo-dig cyclization-initiated cascade reaction•Photoredox-catalyzed N-radical addition to C-C triple bond•C-C triple bond cleavage•Controllable and practical synthesis of diverse heterocycles Tan et al. describe a practical radical cascade reaction via photoredox-catalyzed N-centered radical addition to C-C triple bond, which represents the first N-radical 5-endo-dig cyclization cascade, to the best of their knowledge. This method enables the efficient and controllable synthesis of functionalized benzoxazinones and 2-hydroxy-3-indolinones with wide substrate scope under mild reaction conditions.
ArticleNumber 100577
Author Zhai, Tong-Yi
Sun, Qing
Zhou, Jin-Mei
Tan, Tong-De
Liu, Bin-Yang
Li, Long
Ye, Long-Wu
Qian, Peng-Cheng
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  givenname: Bin-Yang
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  givenname: Long
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  givenname: Peng-Cheng
  surname: Qian
  fullname: Qian, Peng-Cheng
  email: qpc@wzu.edu.cn
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  givenname: Qing
  surname: Sun
  fullname: Sun, Qing
  email: 71043@nchu.edu.cn
  organization: Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, China
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  givenname: Jin-Mei
  surname: Zhou
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  organization: State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
– sequence: 8
  givenname: Long-Wu
  surname: Ye
  fullname: Ye, Long-Wu
  email: longwuye@xmu.edu.cn
  organization: State Key Laboratory of Physical Chemistry of Solid Surfaces, Key Laboratory of Chemical Biology of Fujian Province, and College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
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tandem reaction
radicals
photocatalysis
heterocycles
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Snippet In recent years, significant advances have been made on photoredox-catalyzed N-radical addition to C-C unsaturated bond via N-H bond cleavage. However, these...
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elsevier
SourceType Enrichment Source
Index Database
Publisher
StartPage 100577
SubjectTerms cyclizations
heterocycles
photocatalysis
radicals
tandem reaction
Title Controllable synthesis of benzoxazinones and 2-hydroxy-3-indolinones by visible-light-promoted 5-endo-dig N-radical cyclization cascade
URI https://dx.doi.org/10.1016/j.xcrp.2021.100577
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