4.8 Article

Diborane-Mediated Deoxygenation of o-Nitrostyrenes To Form Indoles

Journal

ORGANIC LETTERS
Volume 18, Issue 16, Pages 4088-4091

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.6b01934

Keywords

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Funding

  1. National Science Foundation of China [21202049]
  2. Recruitment Program of Global Experts (1000 Talents Plan)
  3. National Science Foundation of Fujian Province [2016J01064]
  4. Fujian Hundred Talents Plan
  5. Program of Innovative Research Team of Huaqiao University
  6. University of Illinois at Chicago
  7. Huaqiao University
  8. Fujian 100 Talents Plan
  9. Graduate Innovation Fund

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A mild, transition metal-free, dibotane-imediated deoxygenation of nitro groups was discovered that in situ generates nitrosoarene reactive intermediates. This new reactivity mode of B(2)pin(2) was leveraged to construct indoles from o-nitrostyrenes through a reductive-cyclization reaction that exhibits Hammett rho-value of +0.97 relative to sigma(para) values. Our new deoxygenation reaction is efficient, practical, and scaleable, enabling access to a broad range of indoles.

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