Dihydropyranone formation by ipso C-H activation in a glucal 3-carbamate-derived rhodium acyl nitrenoid
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By using (N-tosyloxy)-3-O-carbamoyl-d-glucal 10, which removes the need for a hypervalent iodine(III) oxidant, we provide evidence for rhodium nitrenoid-mediated ipso C-H activation as the origin of a C3-oxidized dihydropyranone product 3. This system may be especially susceptible to such a pathway because of the ease of forming a cation upon hydride transfer to the rhodium-complexed acyl nitrene. © 2011 American Chemical Society.