Abstract A new method for the synthesis of 3-thioazaspiro[4,5]trienones was developed using Pd nanoparticle catalysts, which are highly efficient, environmentally friendly and recyclable. Alkynes and thiophene phenols are effectively cyclized by Pd/ZrO2 catalyst under visible light irradiation. The present protocol simply utilizes visible light as the safe and ecofriendly energy source, and the Pd/ZrO2
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
proposed to assist the vinyl radical regioselective arylation process. The reaction conditions were also compatible with the conversion of dialkylphosphine oxides to 3-phosphorylated-coumarins and quinolin-2(1H)-one in good yields.
Visible Light-Induced Co- or Cu-Catalyzed Selenosulfonylation of Alkynes: Synthesis of β-(Seleno)vinyl Sulfones
作者:Rong Zhang、Pei Xu、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1021/acs.joc.9b01626
日期:2019.10.4
A visible light-induced Co- or Cu-catalyzed selenosulfonylation of alkynes for the synthesis of β-(seleno)vinyl sulfones is demonstrated. This method utilizes a low-cost cobalt salt or metal copper as the catalysts. The reaction goes through a photoinduced freeradical addition of selenosulfonates to alkynes for the 1,2-selenosulfonylation of alkynes undermildconditions.
Reactions of <i>N</i>,3-diarylpropiolamides with arenes under superelectrophilic activation: synthesis of 4,4-diaryl-3,4-dihydroquinolin-2(1<i>H</i>)-ones and their derivatives
作者:Larisa Yu Gurskaya、Diana S Belyanskaya、Dmitry S Ryabukhin、Denis I Nilov、Irina A Boyarskaya、Aleksander V Vasilyev
DOI:10.3762/bjoc.12.93
日期:——
The reaction of 3-aryl-N-(aryl)propiolamides with arenes in TfOH at room temperature for 0.5 h led to 4,4-diaryl-3,4-dihydroquinolin-2-(1H)-ones in yields of 44-98%. The obtained dihydroquinolinones were further transformed into the corresponding N-acyl or N-formyl derivatives. For the latter, the superelectrophilic activation of the N-formyl group by TfOH in the reaction with benzene resulted in the