Gold-catalyzed Reactions of 3-Alkynyloxireno[2, 3-b]chromenones to Form 3(2H)-Furanones via a Domino Pathway

3(2 H )‐Furanones are efficiently generated from 3‐alkynyl oxireno[2,3‐ b ]chromenones by an Au/DDQ‐catalyzed domino reaction through a pathway composed of cyclization, CC cleavage, nucleophilic addition, oxidation, and nucleophilic addition. It was found that stoichiometric AuCl 3 or catalytic Au with stoichiometric DDQ can oxidize the benzylic sp 3 CH bond to facilitate nucleophilic...