Add time:08/13/2019         Source:sciencedirect.com

1,3-Dipolar cycloaddition (1,3-DC) reaction of 4-Ethoxy-1,1,1-trifluoro-3-buten-2-one (cas 17129-06-5) 1 with nitrile oxides was studied. It was found that besides its CC participating in the formation of isoxazole rings, trifluoromethyl activated CO also underwent 1,3-DC reaction with nitrile oxides to afford 1,4,2-dioxazole rings. Single crystal diffraction analysis also evidenced the diheterocyclic configuration.

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