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Activation of Aryl Carboxylic Acids by Diboron Reagents towards Nickel‐Catalyzed Direct Decarbonylative Borylation
- Source :
- Angewandte Chemie International Edition. 60:24510-24518
- Publication Year :
- 2021
- Publisher :
- Wiley, 2021.
-
Abstract
- The Ni-catalyzed decarbonylative borylation of (hetero)aryl carboxylic acids with B₂cat₂ has been achieved without recourse to any additives. This Ni-catalyzed method exhibits a broad substrate scope covering poorly reactive non- ortho -substituted (hetero)aryl carboxylic acids, and tolerates diverse functional groups including some of the groups active to Ni(0) catalysts. The key to achieve this decarbonylative borylation reaction is the choice of B₂cat₂ as a coupling partner that not only acts as a borylating reagent, but also chemoselectively activates aryl carboxylic acids towards oxidative addition of their C(acyl)-O bond to Ni(0) catalyst via the formation of acyloxyboron compounds. A combination of experimental and computational studies reveals a detailed plausible mechanism for this reaction system, which involves a hitherto unknown concerted decarbonylation and reductive elimination step that generates the aryl boronic ester product. This mode of boron-promoted carboxylic acid activation is also applicable to other types of reactions .
Details
- ISSN :
- 15213773 and 14337851
- Volume :
- 60
- Database :
- OpenAIRE
- Journal :
- Angewandte Chemie International Edition
- Accession number :
- edsair.doi.dedup.....35d1f56f69c14bf52f1f5806863517f2