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Title: Palladium-NHC (NHC = N-heterocyclic Carbene)-Catalyzed Suzuki–Miyaura Cross-Coupling of Alkyl Amides
Award ID(s):
1650766
PAR ID:
10323830
Author(s) / Creator(s):
; ; ; ; ;
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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  1. 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. 
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