A transition-metal-free synthetic method of various ynones via decarboxylative alkynylation of α-keto acids is described. The reaction is carried out undermildconditions and exhibits remarkable tolerance of functional groups. The mechanism of a radical process is proposed in the reaction.
Dual Hypervalent Iodine(III) Reagents and Photoredox Catalysis Enable Decarboxylative Ynonylation under Mild Conditions
作者:Hanchu Huang、Guojin Zhang、Yiyun Chen
DOI:10.1002/anie.201502369
日期:2015.6.26
combination of hypervalentiodine(III) reagents (HIR) and photoredoxcatalysis with visible light has enabled chemoselective decarboxylativeynonylation to construct ynones, ynamides, and ynoates. This ynonylation occurs effectively undermild reaction conditions at room temperature and on substrates with various sensitive and reactive functional groups. The reaction represents the first HIR/photoredox dual
Convenient and General Palladium-Catalyzed Carbonylative Sonogashira Coupling of Aryl Amines
作者:Xiao-Feng Wu、Helfried Neumann、Matthias Beller
DOI:10.1002/anie.201104653
日期:2011.11.18
Bar (alky)none: A general and efficient method for carbonylative Sonogashira coupling reactions of anilines to generate alkynones has been developed (see scheme; TFP=tri(2‐furyl)phosphine). The reaction proceeds under mild conditions and no base is needed.