Mechanistic Insight Leads to a Ligand Which Facilitates the Palladium-Catalyzed Formation of 2-(Hetero)Arylaminooxazoles and 4-(Hetero)Arylaminothiazoles
作者:Esben P. K. Olsen、Pedro L. Arrechea、Stephen L. Buchwald
DOI:10.1002/anie.201705525
日期:2017.8.21
By using mechanistic insight, a new ligand (EPhos) for the palladium‐catalyzed C−N cross‐coupling between primary amines and aryl halides has been developed. Employing an isopropoxy group at the C3‐position favors the C‐bound isomer of the ligand‐supportedpalladium(II) complexes and leads to significantly improved reactivity. The use of a catalyst system based on EPhos with NaOPh as a mild homogeneous