Novel Synthesis of 2-Oxo-3-butynoates by Copper-Catalyzed Cross-Coupling Reaction of Terminal Alkynes and Monooxalyl Chloride
作者:Minjie Guo、Dao Li、Zhaoguo Zhang
DOI:10.1021/jo0353076
日期:2003.12.1
A general and efficient Cu(I)-catalyzed cross-coupling reaction of terminalalkynes and monooxalyl chloride for the synthesis of 2-oxo-3-butynoates and 2-oxo-3-butynoamides was developed. Readily available starting materials, the mild reaction conditions, wide functional group tolerance, and the obviation of stoichiometric organolithium or magnesium reagents combine to highlight this reaction.
gold-catalyzed cyclization reactions of 2-oxo-3-butynoic esters or disubstituted-1,2-diones with a variety of nucleophiles are described, which offer an efficient and straightforward route to substituted 3(2H)-furanones under mild reaction conditions. The Au(III) catalysts are also highly effective in the hydration of these activated alkynes.
of β,γ-unsaturated α-keto esters in iPrOH alone was achieved by using asymmetric binary-acid catalysts. The presence of 0.2 mol% of a chiral phosphoric acid and 0.5 mol% Sc(OTf)3 is sufficient to obtain synthetically relevant β,γ-unsaturated α-hydroxyesters in excellent yields (up to 98%) and enantioselectivities (up to 99% ee). By DFT studies on the transferhydrogenation of 2-oxo-3-enoates, we have