Orthogonal Reactivity of Acyl Azides in C–H Activation: Dichotomy between C–C and C–N Amidations Based on Catalyst Systems
摘要:
The dual reactivity of acyl azides was utilized successfully in C-H activation by the choice of catalyst systems: while selective C-C amidation was achieved under thermal Rh catalysis, a Ru catalyst was found to mediate direct C-N amidation also highly selectively. Investigations of the mechanistic dichotomy between two catalytic systems are also presented.
Identification of the Side Products That Diminish the Yields of the Monoamidated Product in Metal-Catalyzed C–H Amidation of 2-Phenylpyridine with Arylisocyanates
作者:Alasdair I. McKay、Weam A. O. Altalhi、Lachlan E. McInnes、Milena L. Czyz、Allan J. Canty、Paul S. Donnelly、Richard A. J. O’Hair
DOI:10.1021/acs.joc.9b02831
日期:2020.2.21
The Ru(II)-catalyzed amidation of 2-arylpyridines with aryl isocyanates via C-H bond activation is less efficient than described previously, due to the formation of a series of side products, which were readily identified using direct infusion electrospray massspectrometry and high-performance liquid chromatography-mass spectrometry.