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Alkynyl-λ(3)-iodanes have been established as alkynyl cation equivalents for the alkynylation of carbon- and heteroatom-based nucleophiles. Herein, we report an unprecedented reaction mode of this compound class, which features a Pd(II)-assisted 1,2-I(III) shift of an alkynylbenziodoxole. A Pd(II) catalyst mediates this shift and the subsequent interception of the transient vinylidene species with carboxylic acid (1,1-hydrocarboxylation). The product of this stereoselective rearrangement-addition reaction, β-oxyalkenylbenziodoxole, represents a novel and useful building block for further synthetic transformations.

journal of the american chemical society

Pd-Catalyzed Conversion of Alkynyl-λ<sup>3</sup>-iodanes to Alkenyl-λ<sup>3</sup>-iodanes via Stereoselective 1,2-Iodine(III) Shift/1,1-Hydrocarboxylation

Pd-Catalyzed Conversion of Alkynyl-λ3-iodanes to Alkenyl-λ3-iodanes via Stereoselective 1,2-Iodine(III) Shift/1,1-Hydrocarboxylation

Pd-Catalyzed Conversion of Alkynyl-λ³-iodanes to Alkenyl-λ³-iodanes via Stereoselective 1,2-Iodine(III) Shift/1,1-Hydrocarboxylation