作者:Ahmad A. Ibrahim、Pei-Hsun Wei、Gero D. Harzmann、Nessan J. Kerrigan
DOI:10.1021/jo101867m
日期:2010.11.19
phosphine-catalyzed homodimerization of ketoketenes that provides access to a variety of highly substituted ketoketene dimer β-lactones (11 examples) is reported. The Josiphos catalytic system displays good to excellent enantioselectivity (up to 96% ee). Ring-opening reactions of the enantioenriched ketoketene dimers were also carried out to access 1,3-diketones, enol esters, and β-hydroxyketones with good
在本文中,已报道了手性膦催化酮基酮的均二聚化的进展,该方法可提供各种高度取代的酮基酮二聚体β-内酯(11个实例)。Josiphos催化系统显示出良好的对映选择性(高达96%ee)。还进行了对映体富集的酮烯二聚体的开环反应,以非对映选择性良好地获得1,3-二酮,烯醇酯和β-羟基酮。