[GRAPHICS] Treatment of bicyclic lactones derived from Diels-Alder reactions of 3-carbomethoxy-2-pyrone under radical conditions leads to a series of interesting skeletal rearrangements. The stereochemical and optical integrity of the starting material are maintained throughout the process.
Marko, I., Warriner, S. L., & Augustyns, B. (2000). Radical-initiated, skeletal rearrangements of bicyclo[2.2.2] lactones. Organic Letters, 2(20), 3123-3125. https://doi.org/10.1021/ol006324+ (Original work published 2000)