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.
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