Copper-Catalyzed Difunctionalization of Activated Alkynes by Radical Oxidation-Tandem Cyclization/Dearomatization to Synthesize 3-Trifluoromethyl Spiro[4.5]trienones
A copper‐catalyzed difunctionalizing trifluoromethylation of activated alkynes with the cheap reagent sodium trifluoromethanesulfinate (NaSO2CF3 or Langlois’ reagent) has been developed incorporating a tandem cyclization/dearomatization process. This strategy affords a straightforward route to synthesis of 3‐(trifluoromethyl)‐spiro[4.5]trienones, and presents an example of difunctionalization of alkynes
Palladium Nanoparticle-Catalyzed Stereoselective Domino Synthesis of 3-Allylidene-2(3<i>H</i>)-oxindoles and 3-Allylidene-2(3<i>H</i>)-benzofuranones
作者:Naziya Parveen、Govindasamy Sekar
DOI:10.1021/acs.joc.9b03397
日期:2020.4.3
stereoselective protocol for the synthesis of unsymmetrically substituted (E)-3-allylideneoxindole and (E)-3-allylidenebenzofuran from readily accessible starting materials using palladium binaphthyl nanoparticles (Pd-BNPs) has been developed. Pd-BNP showing a wide range of functional group tolerance and an immense array of substrate scope have been explored with the successful synthesis of the drug molecule “tubulin
Copper-Catalyzed Tandem Reaction of Isocyanides with <i>N</i>-(2-Haloaryl)propiolamides for the Synthesis of Pyrrolo[3,2-<i>c</i>]quinolin-4-ones
作者:Fengtao Zhou、Jianguang Liu、Ke Ding、Jinsong Liu、Qian Cai
DOI:10.1021/jo2006939
日期:2011.7.1
The copper-catalyzedtandemreaction of isocyanides with N-(2-haloaryl)propiolamides is very efficient for the synthesis of pyrrolo[3, 2-c]quinolin-4-ones. Highly reactive cyclic organocopper intermediates were proposed to be generated in the copper-catalyzed formal [3 + 2] cycloaddition reaction of isocyanides with triple bonds. Intramolecular trapping of the organocopper intermediates can lead to
铜催化的异氰酸酯与N-(2-卤代芳基)丙酰胺的串联反应对于合成吡咯并[3,2 - c ]喹啉-4-酮非常有效。有人提出,在具有三键的异氰酸酯的铜催化形式[3 + 2]环加成反应中会生成高反应性的环状有机铜中间体。分子内捕获有机铜中间体会导致芳基碳键的形成,这为构建稠合吡咯结构提供了一种有效的方法。
Binaphthyl-Stabilized Palladium Nanoparticle-Catalyzed Stereoselective Synthesis of 3-Arylidene-2-oxindoles via One-Pot Heck-like Carbocyclization/Nucleophilic Addition
synthesis of 3-arylidene-2-oxindoles has been accomplished via Heck-like carbocyclization/nucleophilic addition of N-(2-iodophenyl)-N-methyl-3-phenylpropiolamide, phenylacetylene, and secondary amine using binaphthyl stabilized palladium nanoparticles (Pd-BNP) as a reusable catalyst. Less reactive aryl bromides generally provided a similar yield of 3-arylidene-2-oxindoles compared with more reactive aryl iodides