DDQ-Mediated Oxidative [5+2] Cycloaddition Reactions of Isochroman-4-ones with Alkynes
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A DDQ (2,3-dichloro-5,6-dicyano-1,4-benzoquinone)-mediated oxidative [5+2] cycloaddition of isochroman-4-ones with alkynes has been described. This strategy provides an alternative method for the generation of the key benzopyrylium ylides as dipoles and afford... ...
