Studies on the coupling of substituted 2-amino-1,3-oxazoles with chloro-heterocycles
摘要:
Direct coupling of five-membered heterocyclic amines with halo-heterocycles is a notoriously recalcitrant transformation. Herein we report our findings on the coupling of substituted 2-amino-1,3-oxazoles with chloro-heterocycles. Whereas the coupling of 2-amino-1,3-oxazole is inefficient under a large variety of state-of-the-art catalytic conditions tested, coupling of an ester substituted 2-amino-1,3-oxazole is relatively efficient and provides access, via a hydrolysis-decarboxylation protocol, to the 2-amino-1,3-oxazole coupled products. (C) 2012 Elsevier Ltd. All rights reserved.
PAd2‐DalPhos Enables the Nickel‐Catalyzed C−N Cross‐Coupling of Primary Heteroarylamines and (Hetero)aryl Chlorides
作者:Jillian S. K. Clark、Michael J. Ferguson、Robert McDonald、Mark Stradiotto
DOI:10.1002/anie.201900095
日期:2019.5.6
(hetero)arylchlorides, while sought‐after given the ubiquity of unsymmetrical di(hetero)arylamino fragments in pharmacophores, are unknown. Herein, we disclose the new “double cage” bisphosphine PAd2‐DalPhos (L2). The derived air‐stable NiII pre‐catalyst C2 functions well at low loadings in challenging test C−N cross‐couplings with established substrates, and facilitates the first Ni‐catalyzed C−N cross‐couplings