formation or C–C bond formation upon homocondensation or reaction with simple olefins, respectively. Cyclization followed by a final oxidation generates these classes of interesting bioactive heterocycles in one synthetic transformation. Additionally, the one-pot multicomponent synthesis of quinolines from anilines, aldehydes, and olefins has also been successfully developed under these mild oxidative conditions
A novel I2-mediated Povarov reaction of arylacetylenes and anilines for the synthesis of 2,4-substituted quinolines has been developed, in which arylacetylene first acts as both a diene precursor and dienophile. This work further develops the Povarov reaction to expand the types of diene precursors. Preliminary mechanistic studies indicate that the I2/DMSO system realized the oxidative carbonylation
TEMPO Oxoammonium Salt-Mediated Dehydrogenative Povarov/Oxidation Tandem Reaction of N-Alkyl Anilines
作者:Heinrich Richter、Olga García Mancheño
DOI:10.1021/ol202552y
日期:2011.11.18
The synthesis of a variety of substituted quinolines from N-alkyl anilines by a one-pot dehydrogenative Povarov/oxidation tandem reaction with mono- and 1,2-disubstituted aryl and alkyl olefins was developed. A simple protocol using cheap and benign iron(III)chloride as the Lewis acid catalyst and a TEMPO oxoammonium salt as a nontoxic, mild, efficient oxidant is reported.
A highly efficient I2-catalyzed Povarov-type reaction of methylketones, arylamines, and α-ketoesters is developed. This reaction utilizes a catalytic amount of HI coproduct as a promoter for the synthesis of substituted quinolones. This simple procedure represents an interesting new form of reactivity for the Povarov reaction with good functional group compatibility.
Povarov-Type Reaction Using Methyl as New Input: Direct Synthesis of Substituted Quinolines by I<sub>2</sub>-Mediated Formal [3 + 2 + 1] Cycloaddition
作者:Qinghe Gao、Shan Liu、Xia Wu、Anxin Wu
DOI:10.1021/ol502134u
日期:2014.9.5
iodine mediated formal [3 + 2 + 1] cycloaddition reaction for the direct synthesis of substituted quinolines from methyl ketones, arylamines, and styrenes is developed. The methyl group of the methyl ketone represents uniquely reactive input in the Povarov reaction. A self-sequenced iodination/Kornblum oxidation/Povarov/aromatization mechanism has been proposed as a possible reaction sequence to account