palladium-catalyzed oxidative coupling reactions of N-substituted indoles or their carboxylic acid derivatives with alkynes. Unsymmetrically octasubstituted carbazoles can also be obtained by the stepwise couplings of 1-methylpyrrole-2-carboxylic acid with two different alkynes. In addition, the present coupling procedure is applicable to the synthesis of other various heteroarenes possessing di-, tri-, and tetracyclic
Palladium-Catalyzed Ring-Expansion Reaction of Indoles with Alkynes: From Indoles to Tetrahydroquinoline Derivatives Under Mild Reaction Conditions
作者:Zhuangzhi Shi、Bo Zhang、Yuxin Cui、Ning Jiao
DOI:10.1002/anie.201001237
日期:2010.6.1
cut and shut job: The highly selective title reaction proceeds, using O2 as the oxidant, to afford tetrahydroquinoline derivatives. This chemistry offers a new approach to polysubstituted 4,5‐dihydrocyclopenta[c]quinolines, and also valuable mechanistic insight into this ring‐expansion reaction.
封闭工作:使用O 2作为氧化剂,进行高度选择性的标题反应,得到四氢喹啉衍生物。该化学方法为多取代的4,5-二氢环戊五[ c ]喹啉提供了一种新方法,并且为这种扩环反应提供了有价值的机理见解。
Synthesis of Condensed Heteroaromatic Compounds by Palladium-Catalyzed Oxidative Coupling of Heteroarene Carboxylic Acids with Alkynes
The palladium-catalyzedoxidative coupling of indole-3-carboxylic acids with alkynes effectively proceeds in a 1:2 manner accompanied by decarboxylation to produce the corresponding 1,2,3,4-tetrasubstituted carbazoles, some of which exhibit solid-state fluorescence. Pyrrole-, benzofuran-, and furancarboxylic acids also undergo the decarboxylative coupling to afford highly substituted indole, dibenzofuran