Advanced Synthesis & Catalysis
10.1002/adsc.202000078
General Procedure for the Preparation
of 4, 6 and 7
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To a sealed tube were added olefins (0.4 mmol, 2.0 equiv.),
imidazo[1,2-a]pyridines (0.2 mmol), t-BuONO (48 μL, 0.4
mmol, 2.0 equiv.) and DMSO (1 mL). The reaction
mixture was stirred at 80 °C for 24 h in oil bath under Ar.
After being cooled to room temperature, the resulting
solution was diluted with EtOAc (10 mL). The organic
layer was washed with water (10 mL). The aqueous phase
was re-extracted with EtOAc (5 mL). The combined
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2 4
organic layers were dried over Na SO and concentrated in
vacum, and the resulting residue was purified by silica gel
column chromatography with petroleum ether/ethyl acetate
(
3:1−1:1) as eluent to afford the desired products 4, 6 or 7.
Acknowledgements
This work was supported by the National Natural Science
Foundation of China (Project 21672104, 21502097), the Natural
Science Foundation of the Education Department of Jiangsu
province (15KJB150015), and the Priority Academic Program
Development of Jiangsu Higher Education Institutions. The
authors also thank Mr. Hailong Liu for the determination of
HRMS.
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