Abstract
A copper-catalyzed trifluoromethylation–cyclization of olefinic carbonyls was developed. With this method, a variety of 2,3-dihydrofuran and 3,4-dihydropyran derivatives containing a CF3 group were selectively obtained in moderate to good yields. This chemistry represents a rare example of direct construction of trifluoromethylated oxygen-containing heterocycles via the combination of radical trifluoromethylation with endo-type radical addition to carbonyls.
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