Palladium-NHC (NHC = N-heterocyclic Carbene)-Catalyzed Suzuki–Miyaura Cross-Coupling of Alkyl Amides
                        
                    - Award ID(s):
- 1650766
- PAR ID:
- 10323830
- Date Published:
- Journal Name:
- ACS Catalysis
- Volume:
- 12
- Issue:
- 4
- ISSN:
- 2155-5435
- Page Range / eLocation ID:
- 2426 to 2433
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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            Abstract An N‐heterocyclic‐carbene‐ligated 3‐benzoborepin with a bridged structure has been synthesized by double radicaltrans‐hydroboration of benzo[3,4]cycloundec‐3‐ene‐1,5‐diyne with an N‐heterocyclic carbene borane. The thermal reaction of the NHC‐ligated borepin at 150 °C gives an isolable NHC‐boranorcaradiene. Experiments and density functional theory calculations support a mechanism whereby the borepin initially rearranges to a boranorcaradiene by a thermal 6π‐electrocyclic reaction. This is followed by 1,5‐boron shift to give a rearranged boranorcaradiene. This shift occurs with stereoinversion at boron through a transition state with open‐shell diradical character. This is the first example of the isolation of a boranorcaradiene from a thermal reaction of a borepin.more » « less
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