Ynamide Carbopalladation: A Flexible Route to Mono‐, Bi‐ and Tricyclic Azacycles
作者:Craig D. Campbell、Rebecca L. Greenaway、Oliver T. Holton、P. Ross Walker、Helen A. Chapman、C. Adam Russell、Greg Carr、Amber L. Thomson、Edward A. Anderson
DOI:10.1002/chem.201501710
日期:2015.9
Bromoenynamides represent precursors to a diversity of azacycles by a cascade sequence of carbopalladation followed by cross‐coupling/electrocyclization, or reduction processes. Full details of our investigations into intramolecular ynamidecarbopalladation are disclosed, which include the first examples of carbopalladation/cross‐coupling reactions using potassium organotrifluoroborate salts; and an
Reductive Cyclization of Bromoenynamides with Alcohols as Hydride Source: Synthesis and Reactions of 2-Amidodienes
作者:Rebecca L. Greenaway、Craig D. Campbell、Helen A. Chapman、Edward A. Anderson
DOI:10.1002/adsc.201200703
日期:2012.11.26
Under basic conditions in alcoholic solvents, bromoenynamides undergo palladium-catalyzed cyclization to cyclic 2-amidodienes in good to excellent yields. This process represents the first use of an alcohol as a hydride source in an alkynecarbopalladation/termination sequence, with the site selectivity of the reduction showing a strong dependence on the tethering ring size (5–8), and the nature of