A Bulky Biaryl Phosphine Ligand Allows for Palladium-Catalyzed Amidation of Five-Membered Heterocycles as Electrophiles
作者:Mingjuan Su、Stephen L. Buchwald
DOI:10.1002/anie.201201244
日期:2012.5.7
The first palladium‐catalyzedamidation of five‐membered heterocyclic bromides with multiple heteroatoms was achieved using the Pd/1 catalyst system. N‐Arylated imidazoles, pyrazoles, thiazoles, pyrroles, and thiophenes were synthesized in moderate to excellent yield. Experimental results and DFT calculations point to the need for an electron‐rich and sterically demanding biaryl phosphine ligand to