Catalytic Amination of 2-Substituted Pyridines with Hydrazine Derivatives
作者:Jeffrey B. Arterburn、Kalla Venkateswara Rao、Ranjit Ramdas、Benjamin R. Dible
DOI:10.1021/ol015731y
日期:2001.5.1
were prepared in a one-step palladium-catalyzed amination reaction using chelating phosphine ligands. 2-Pyridyl chlorides, bromides, and triflates were effective electrophiles in these reactions. Di-tert-butyl hydrazodiformate was an excellent hydrazine substrate, and the resulting products were deprotected under mild conditions. Catalytic amination provides a direct route to protected bifunctional
Inverting Conventional Chemoselectivity in Pd-Catalyzed Amine Arylations with Multiply Halogenated Pyridines
作者:Mitchell H. Keylor、Zachary L. Niemeyer、Matthew S. Sigman、Kian L. Tan
DOI:10.1021/jacs.7b05409
日期:2017.8.9
A new catalyst system capable of selective chloride functionalization in the Pd-catalyzedamination of 3,2- and 5,2- Br/Cl-pyridines is reported. A reaction optimization strategy employing ligand parametrization led to the identification of 1,1′-bis[bis(dimethylamino)phosphino]ferrocene “DMAPF”, a readily available yet previously unutilized diphosphine, as a uniquely effective ligand for this transformation