Synthesis of (+)-juruenolide C: use of sequential 5-exo-digonal radical cyclization, 1,5-intramolecular hydrogen transfer, and 5-endo-trigonal cyclization

The synthesis of (+)-juruenolide C is discussed. Results indicate that the conversion of lactone into lactol bezyl ether and lactone carbonyl regeneration led to (+)-juruenolide C.