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Title: Bulky Phosphine Ligands Promote Palladium-Catalyzed Protodeboronation

Journal Article · · Journal of the American Chemical Society
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [7]
  1. University of Toronto, ON (Canada); Vector Institute for Artificial Intelligence, Toronto, ON (Canada)
  2. University of Toronto, ON (Canada); Acceleration Consortium, Toronto, ON (Canada)
  3. University of Toronto, ON (Canada); Vector Institute for Artificial Intelligence, Toronto, ON (Canada); Acceleration Consortium, Toronto, ON (Canada)
  4. University of Toronto, ON (Canada); ETH Zurich (Switzerland)
  5. University of Toronto, ON (Canada); Harvard University, Cambridge, MA (United States)
  6. University of Toronto, ON (Canada); University of Groningen (The Netherlands)
  7. University of Toronto, ON (Canada); Vector Institute for Artificial Intelligence, Toronto, ON (Canada); Acceleration Consortium, Toronto, ON (Canada); Canadian Institute for Advanced Research (CIFAR), Toronto, ON (Canada); Institute of Medical Science, Toronto, ON (Canada)

The Suzuki-Miyaura cross-coupling reaction is plagued by protodeboronation, an undesirable side reaction with water that consumes the boronic acid derivatives required for the cross-coupling reaction. Meticulous mechanistic studies have previously established protodeboronation to be highly sensitive to the nature of the boronic reagent and reaction conditions. Particularly, the presence of bases, which are essential for the Suzuki-Miyaura coupling, is known to catalyze protodeboronation. However, protodeboronation catalyzed by palladium-phosphine complexes, the benchmark catalyst system for Suzuki-Miyaura cross-coupling, has been understudied compared to its base-catalyzed counterpart. Here, we demonstrate, using automated high-throughput experimentation, comprehensive computational mechanistic analyses and kinetic modeling, that protodeboronation is accelerated by palladium(II) complexes bound to bulky phosphine ligands. While sterically hindered ligands are typically used to facilitate difficult cross-couplings, these ligands can instead paradoxically impede cross-coupling product formation, requiring careful and judicious consideration when choosing ligands for Suzuki-Miyaura cross-couplings.

Research Organization:
University of Minnesota, Minneapolis, MN (United States)
Sponsoring Organization:
DARPA; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0023454
OSTI ID:
3023783
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 47 Vol. 147; ISSN 0002-7863; ISSN 1520-5126
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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