Studies toward the Total Syntheses of Cucurbitacins B and D
作者:Michael E. Jung、Rebecca M. Lui
DOI:10.1021/jo101242e
日期:2010.11.5
Synthetic efforts toward the convergent construction of the tetracyclic triterpenoids cucurbitacins B and D are described. The results of a Diels−Alder study examining the effects of steric and electronic variations of 2-methyl-2-cyclohexenone on the endo/exo-diastereoselectivity of the reaction are presented. The diastereomer of the core of the cucurbitacins, epimeric at C8, C9, and C10, 51, was synthesized
Rapid Access to Multisubstituted Acrylamides from Cyclic Ketones via Palladium/Norbornene Cooperative Catalysis
作者:Zhao Wu、Guangbin Dong
DOI:10.1002/anie.202201239
日期:2022.4.19
A palladium/norbornene-catalyzed vicinal difunctionalization of enol triflates has been developed for rapid, modular and regioselective synthesis of multisubstituted acrylamides from simple ketones. The reaction exhibits broad functional group tolerance, and the use of bulky secondary amide-derived norbornenes appears to be a key parameter to maintain high efficiency and selectivity.