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
Metal-free spirocyclization of <i>N</i>-arylpropiolamides with glyoxylic acids: access to complex azaspiro-fused tricycles
作者:Akshay M. Nair、Anand H. Shinde、Shreemoyee Kumar、Chandra M. R. Volla
DOI:10.1039/d0cc04800c
日期:——
An efficient K2S2O8-mediated oxidative cascade spirocyclization of N-arylpropiolamides with aryl glyoxylic acids was demonstrated for constructing azaspiro[4,5]-trienones and complex azaspiro-fused architectures.
Visible-Light-Mediated <i>Ipso</i>-Carboacylation of Alkynes: Synthesis of 3-Acylspiro[4,5]trienones from <i>N</i>-(<i>p</i>-Methoxyaryl)propiolamides and Acyl Chlorides
A novel visible-light-mediated ipso-carboacylation of N-(p-methoxyaryl)propiolamides with acyl chloride has been established for the synthesis of diverse 3-acylspiro[4,5]trienones with high selectivity and efficiency. This method represents a new difunctionalization of alkynes through cross coupling of the acyl chloride C–Cl bonds with an ipso-aromatic carbon by simultaneously forming two new carbon–carbon
A nitrogen-centered radical strategy for the preparation of 3-acylated spiro[4,5]trienones via visible-light-mediated acylation/ipso-cyclization of alkynes with acyl oxime esters is reported. The alkyl- and aryl-substituted acylradicals, which generate from the cleavage of carbon-carbon σ-bonds in acyl oxime esters via nitrogen-centered radical pathway, attack the carbon-carbon triple bonds in propiolamides