Manganese Catalyzed Site‐Selective Hydroxymethylation to 2‐Pyridones and Isoquinolones via C−H Activation
摘要:
Pyridine‐directed regioselective C‐H hydroxymethylation to pyridones and isoquinolones using para‐formaldehyde has been developed under manganese catalysis, offering a wide variety of hydroxymethylated products in 40‐85% yields. This operationally simple methodology proceeds in one step using an earth‐abundant first‐row transition metal‐catalyst without the generation of unwanted salt wastes. A mechanistic study revealed that the C‐H metalation step is reversible but not the rate‐determining step. The introduction of hydroxymethyl group in the biologically relevant scaffolds could be used as an intermediate for valuable synthetic transformations.
An improved Ullmann–Ukita–Buchwald–Li conditions for CuI-catalyzed coupling reaction of 2-pyridones with aryl halides
作者:Po-Shih Wang、Chih-Kai Liang、Man-kit Leung
DOI:10.1016/j.tet.2005.01.063
日期:2005.3
An effective CuI-trans-N,N'-dimethylcyclohexane-1,2-diamine (DMCDA)-K2CO3-cataIyzed coupling reaction of 2-pyridones with aryl halides is described. Under our conditions, DMCDA was found to be an effective catalyst that facilitates the coupling reactions even in toluene, a common industrial solvent. In addition, 3-bromopyridine could also be coupled effectively under these conditions, indicating that the catalytic reactivity of this system is high. The reaction could be applied for polymer modification and iterative oligo-pyridone synthesis. (c) 2005 Elsevier Ltd. All rights reserved.
Unusual hydrolysis of 2-nitrosopyridines. Formation of 1-(2-pyridyl)-2(1H)-pyridones
作者:Edward C. Taylor、Kenneth A. Harrison、Jang B. Rampal
DOI:10.1021/jo00351a023
日期:1986.1
TAYLOR, E. C.;HARRISON, K. A.;RAMPAL, J. B., J. ORG. CHEM., 1986, 51, N 1, 101-102