Synthesis of (Z)-3-aryloxy-acrylonitriles, (E)-3-aryloxy-acrylonitriles and 3-cyanobenzofurans through the sequential reactions of phenols with propiolonitriles
Palladium-Catalyzed Carbonylative α-Arylation of <i>tert</i>-Butyl Cyanoacetate with (Hetero)aryl Bromides
作者:Mikkel T. Jensen、Martin Juhl、Dennis U. Nielsen、Mikkel F. Jacobsen、Anders T. Lindhardt、Troels Skrydstrup
DOI:10.1021/acs.joc.5b02897
日期:2016.2.19
A three-component coupling protocol has been developed for the generation of 3-oxo-3-(hetero)arylpropanenitriles via a carbonylativepalladium-catalyzedα-arylation of tert-butyl 2-cyanoacetates with (hetero)aryl bromides followed by an acid-mediated decarboxylation step. Through the combination of only a stoichiometric loading of carbon monoxide and mild basic reaction conditions such as MgCl2 and
Synthesis of (Z)-3-aryloxy-acrylonitriles, (E)-3-aryloxy-acrylonitriles and 3-cyanobenzofurans through the sequential reactions of phenols with propiolonitriles
作者:Wei Zhou、Yicheng Zhang、Pinhua Li、Lei Wang
DOI:10.1039/c2ob25969a
日期:——
A Na2CO3-promoted addition of phenols to propiolonitriles generated (Z)-3-aryloxy-acrylonitriles in nearly quantitative yields with exclusively Z-isomers, and a DABCO-promoted addition reaction of phenols with propiolonitriles afforded mainly (E)-3-aryloxy-acrylonitriles with high yields. The obtained (E)-3-aryloxy-acrylonitriles underwent intramolecular cyclization to give 3-cyanobenzofurans in good yields through palladium-catalyzed direct C–H bond functionalization.