Abstract
A direct and efficient synthetic route for [3 + 2] cycloaddition of diynes with aldoximes induced by hypervalent iodine has been described, thus providing 3,5-disubstituted isoxazoles in moderate to good yields with high regioselectivity at room temperature. This transformation was carried out in the presence of [bis(trifluoroacetoxy)iodo]benzene as a promoter and demonstrated high levels of functional-group tolerance.
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Acknowledgements
We are grateful to the support from the Startup Fund for PhDs of Natural Scientific Research of Zhengzhou University of Light Industry (to X.F.) and Key Projects of Colleges and Universities in Henan Province (No. 17A150053).
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Xu, F., Kang, WF., Wang, XN. et al. Hypervalent iodine-induced formation of 3,5-disubstituted isoxazoles via [3 + 2] cycloaddition of diynes with aldoximes. Monatsh Chem 148, 1109–1116 (2017). https://doi.org/10.1007/s00706-016-1907-3
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DOI: https://doi.org/10.1007/s00706-016-1907-3