Synthesis of Quinolines via Rh(III)-Catalyzed Oxidative Annulation of Pyridines
作者:Guoyong Song、Xue Gong、Xingwei Li
DOI:10.1021/jo201266u
日期:2011.9.16
Selective synthesis of quinolines has been achieved via oxidative annulation of functionalized pyridines with two alkyne molecules under Rh(III)-catalyzed cascade C–H activation of pyridines using Cu(OAc)2 as an oxidant. The selectivity of this reaction is oxidant-dependent, particularly on the anion of the oxidant.
Intermolecular ‘oxidative’ aromatic substitution reactions of the imidazol-5-yl radical mediated by the ‘reductant’ Bu3SnH
作者:Padraig T.F. McLoughlin、Mairéad A. Clyne、Fawaz Aldabbagh
DOI:10.1016/j.tet.2004.06.120
日期:2004.9
The reactivity of the imidazol-5-yl in comparison to the imidazol-2-yl and phenyl radical under the reductive conditions of Bu3SnH, in intermolecular substitutionreactions onto various aromatic substrates is reported. The directing effect of the hetero atom or methyl substituent in aromatic substrates was found to be more important than the polarity of the attacking σ-radical in determining the major
The present invention provides compounds having a structure according to Formula (I):
or a salt or solvate thereof, wherein ring A, X, R
1
, R
2
, R
3
, R
4
, R
5
and R
6
are defined herein. The invention further provides pharmaceutical compositions including the compounds of the invention and methods of making and using the compounds and compositions of the invention, e.g., in the treatment and prevention of various disorders, such as Parkinson's disease.
Investigations of 2-substituted imidazoles. 2. Synthesis and electrophilic substitution of 1-methyl-2-(thienyl-2)imidazole. A convenient method of methylation of 2-R-imidazoles
作者:V. M. Stoyanov、M. M. El'chaninov、A. F. Pozharskii