4.8 Article

Rhenium-Catalyzed [4+1] Annulation of Azobenzenes and Aldehydes via Isolable Cyclic Rhenium(I) Complexes

Journal

ORGANIC LETTERS
Volume 17, Issue 10, Pages 2434-2437

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.5b00938

Keywords

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Funding

  1. National Basic Research Program of China (973 Program) [2011CB808600]
  2. National Natural Science Foundation of China [21322203, 21272238, 21472194]

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The first Re-catalyzed [4 + 1] annulation of azobenzenes with aldehydes was developed to furnish 2H-indazoles via isolable and characterized cyclic Re-I-complexes. For the first time, the acetate-acceleration effect is showcased in Re-catalyzed C-H activation reactions. Remarkably, mechanistic studies revealed an irreversible aldehyde-insertion step, which is in sharp contrast to those of previous Rh- and Co-systems.

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