the position of C-C bond formation on the acetylene moiety. In most of the cases, the reaction requires less than 1-mol % loading of the catalyst and does not require solvent. The reaction tolerates a wide variety of functional groups including ester, ether, allylic halide, furan, thiophene, and protected amine. Experimental and theoretical studies suggested that the reaction proceeds via a concerted
Indium-Catalyzed Addition of Active Methylene Compounds to 1-Alkynes
作者:Masaharu Nakamura、Kohei Endo、Eiichi Nakamura
DOI:10.1021/ja038006m
日期:2003.10.1
An activemethylenecompound adds to a 1-alkyne in high to quantitative yield upon heating in the presence of 0.05-5 mol % of In(OTf)3 to give an alpha-alkenylated carbonyl compound.
[GRAPHICS]A rhenium complex, [ReBr(CO)(3)(thf)](2), Catalyzed the intermolecular reactions of 1,3-dicarbonyl compounds with terminal acetylenes and gave the corresponding alkenyl derivatives in excellent yields. These reactions could apply to an intramolecular version and gave the corresponding cyclic compounds quantitatively.
Highly Regio- and Stereoselective Addition of 1,3-Diketones to Internal Alkynes Catalyzed by Cationic Iridium Complex
The first regio- and stereoselective addition of 1,3-diketones to unfunctionalized internal alkynes under neutral conditions is achieved by using [Ir(cod)2]SbF6 as a catalyst.