A novel methodology for the heterogeneous palladium-catalyzed C–H alkenylation of N-methoxybenzamides and anilides is presented. This approach is based on the use of commercially available Pd/C as catalyst and molecular oxygen as terminal oxidant, in combination with a substoichiometric amount of benzoquinone. Furthermore, the reaction can be conducted in non-toxic biomass-derived γ-valerolactone (GVL)
Oppolzer-Type Intramolecular Diels–Alder Cycloadditions via Isomerizations of Allenamides
作者:John B. Feltenberger、Richard P. Hsung
DOI:10.1021/ol2010227
日期:2011.6.17
A new approach to Oppolzer's Intramolecular Dlels-Alder cycloaddition (IMDA) through gamma-isomerlzation of readily available N-tethered allenamides is described. These IMDA reactions are carried out in tandem with the allenamide isomerization or 1,3-H shift, leading to complex nitrogen heterocycles in a highly stereoselective manner.