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Copper-catalyzed oxidative cross-dehydrogenative coupling of 2H-chromenes and terminal alkynes

An efficient copper-catalyzed cross-dehydrogenative coupling of 2H-chromenes and terminal alkynes mediated by DDQ has been established. A protic additive, EtOH, proved to be crucial for harmonizing the oxidation with a subsequent alkynylation step by retaining the oxidation state of an oxocarbenium ion in the form Synthetic methodology in OBC

Authors:   Fei Yang; Yangshan Li; Paul E. Floreancig; Xiaoyan Li; Lei Liu
Journal:   Organic & Biomolecular Chemistry
DOI:   10.1039/C8OB00949J
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