4.7 Article

N-Allylbenzimidazole as a strategic surrogate in Rh-catalyzed stereoselective trans-propenylation of aryl C(sp2)-H bond

Journal

CHEMICAL COMMUNICATIONS
Volume 59, Issue 2, Pages 199-202

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d2cc06048e

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Funding

  1. NISER
  2. Department of Atomic Energy (DAE)
  3. Council for Scientific and Industrial Research (CSIR), New Delhi [02(0256)/16/EMR II]
  4. Science and Engineering Research Board (SERB), New Delhi [EMRII/2017/001475]
  5. DST INSPIRE

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This article reports a novel reaction method for the highly stereoselective C(sp(2))-H propenylation using N-allyl benzimidazole as a catalyst. Detailed mechanistic studies were conducted to understand the reaction mechanism.
A Rh-catalyzed C(sp(2))-H propenylation has been reported by taking N-allyl benzimidazole as an allylamine congener. This transformation has been observed for the first time, where a tandem process of C-H allylation followed by alkene isomerization delivers a highly stereoselective trans-propenylated product. Detailed mechanistic studies including the characterization of rhodacycle-intermediates have been conducted to understand the mechanism.

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