Visible-light-enabled spirocyclization of alkynes leading to 3-sulfonyl and 3-sulfenyl azaspiro[4,5]trienones
作者:Wei Wei、Huanhuan Cui、Daoshan Yang、Huilan Yue、Chenglong He、Yulong Zhang、Hua Wang
DOI:10.1039/c7gc02330h
日期:——
A visible-light-induced strategy has been established for the synthesis of 3-sulfonyl and 3-sulfenyl azaspiro[4,5]trienones at room temperature in air.
Intramolecular ipso-arylative cyclization of aryl-alkynoates and N-arylpropiolamides with aryldiazonium salts through merged gold/visible light photoredox catalysis
作者:Avinash H. Bansode、Samir R. Shaikh、Rajesh G. Gonnade、Nitin T. Patil
DOI:10.1039/c7cc04010e
日期:——
A visible-light-promoted merged gold/photoredox catalyzed ipso-arylative cyclization has been reported. For instance, the reaction of aryl-alkynoates and N-arylpropiolamides with aryldiazonium salts in the presence of catalytic amounts of [(4-OCH3)C6H4]3PAuCl and Ru(bpy)3(PF6)2 under irradiation using a 32 W CFL bulb gave arylated spirocarbocycles in moderate to good yields.
可见光促进的合并金/ photoredox催化IPSO -arylative环化的报道。例如,芳基和alkynoates的反应Ñ与芳基重氮盐-arylpropiolamides在催化量的[(4-OCH存在3)C 6 H ^ 4 ] 3 PAuCl和Ru(联吡啶)3(PF 6)2下照射使用32 W CFL灯泡可获得中等至良好收率的芳基化螺碳环化合物。
Visible light-mediated <i>ipso</i>-annulation of activated alkynes: access to 3-alkylated spiro[4,5]-trienones, thiaspiro[4,5]-trienones and azaspiro[4,5]-trienones
A novel method for chemoselective difunctionalization of activated alkynes for synthesizing 3-alkylated spiro[4,5]-trienones, thiaspiro[4,5]-trienones and spirolactams has been uncovered using photoredox catalysis under visible light conditions. The rarely used tricarbonyl compounds in photoredox catalysis were used as the alkylating source. A remarkable functional group tolerance was observed, and
Ag-Catalyzed Oxidative <i>ipso</i>-Cyclization via Decarboxylative Acylation/Alkylation: Access to 3-Acyl/Alkyl-spiro[4.5]trienones
作者:Chada Raji Reddy、Dattahari H. Kolgave、Muppidi Subbarao、Mounika Aila、Santosh Kumar Prajapti
DOI:10.1021/acs.orglett.0c01588
日期:2020.7.17
A strategy to functionalized spiro[4.5]trienones, by domino silver-catalyzed decarboxylative acylation or alkylation/ ipso-cyclization of N-arylpropiolamides with α-ketoacids/alkyl carboxylic acids, is presented. This transformation offers a wide range of substituted 3-acyl/alkyl-spiro[4.5]trienones in high yields with a broad substrate scope. The approach was further extended to access fused tricyclic