Allylic Substitution versus Suzuki Cross-Coupling: Capitalizing on Chemoselectivity with Bifunctional Substrates
作者:Mahmud M. Hussain、Patrick J. Walsh
DOI:10.1002/anie.200905399
日期:2010.3.1
One catalyst, two reactions—a tale of chemoselectivity: Given the choice between an allylic acetate and a vinylboronate ester, palladium preferentially reacts with the allylic acetate to give the allylicsubstitution product. In the presence of an aryl bromide and base, Suzuki cross‐coupling subsequently ensues to afford allylic amines (see scheme; pin=pinacol, THF=tetrahydrofuran).
Palladium-Catalyzed Chemoselective Allylic Substitution, Suzuki-Miyaura Cross-Coupling, and Allene Formation of Bifunctional 2-B(pin)-Substituted Allylic Acetate Derivatives
作者:Byeong-Seon Kim、Mahmud M. Hussain、Nusrah Hussain、Patrick J. Walsh
DOI:10.1002/chem.201402353
日期:2014.9.8
of organic synthesis is the control of chemoselectivity to enable the selective formation of diverse structural motifs from a readily available substrate class. Presented herein is a detailed study of chemoselectivity with palladium‐based phosphane catalysts and readily available 2‐B(pin)‐substituted allylic acetates, benzoates, and carbonates. Depending on the choice of reagents, catalysts, and reaction