10.1002/adsc.202000531
Advanced Synthesis & Catalysis
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Scheme 3. Plausible catalytic cycle.
In summary, we have developed an efficient
nickel/NHC-catalyzed Suzuki-Miyaura coupling of
aryl sulfoxides. The key to success is the rational
design of NHC ligands which show strong donating
ability and suitable steric hindrance. The NHC ligands
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are
generated
in
situ
from
5-(2,4,6-
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triisopropylphenyl)imidazoylidene[1,5-a]pyridine and
their precursors are readily prepared from inexpensive
and common commercial reagents. A number of
biphenyls were obtained in moderate to excellent
yields. However, heterocyclic coupling partners are
still limited. Further improvement of the NHC ligands
is needed to expand the scope of heteroaryl sulfoxides
as well as heteroarylboronic acids.
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Experimental Section
General Procedure for the Suzuki-Miyaura
Coupling of Aryl Sulfoxides
To an oven-dried tube equipped with a magnetic
stirring bar were added sequentially diaryl sulfoxide 1
(0.3 mmol), boronic acid 2 (0.45 mmol), Ni(acac)2
(5.8 mg, 0.0225 mmol), HL1·Cl (20.7 mg, 0.045
mmol), KOtBu (101 mg, 0.9 mmol), and dioxane (1.5
mL) under N2 atmosphere. The reaction mixture was
stirred at room temperature for 30 minutes, and then
o
heated by a mantle (IKA RCT B S025) at 130 C for
36 hours. The reaction mixture was cooled to room
temperature, and then it was passed through a short
pad of celite with CH2Cl2. The solution was
concentrated in vacuo. The residue was purified by
silica gel column chromatography to give the
coupling product 3.
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Acknowledgements
[13] Y. Yoshida, S. Otsuka, K. Nogi, H. Yorimitsu, Org.
Lett. 2018, 20, 1134-1137.
We thank the National Natural Science Foundation (NSF) of
China (21572203) for financial support.
[14] K. Yamamoto, S. Otsuka, K. Nogi, H. Yorimitsu,
ACS Catal. 2017, 7, 7623-7628.
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