Regio- and Enantioselective Rhodium-Catalyzed Addition of 1,3-Diketones to Allenes: Construction of Asymmetric Tertiary and Quaternary All Carbon Centers
作者:Thorsten M. Beck、Bernhard Breit
DOI:10.1002/anie.201610577
日期:2017.2.6
An unprecedented highly regio‐ and enantioselective rhodium‐catalyzed addition of 1,3‐diketones to terminal and 1,1‐disubstituted allenes furnishing asymmetric tertiary and quaternary all‐carbon centers is reported. By applying a RhI/phosphoramidite/TFA catalytic system under mild conditions, the desired chiral branched α‐allylated 1,3‐diketones could be obtained in good to excellent yields, with perfect
据报道,前所未有的高度区域和对映体选择性的铑催化向末端和1,1-二取代的丙二烯加成1,3-二酮,提供不对称的叔碳和季碳全中心。通过在温和的条件下应用Rh I /磷酰胺/ TFA催化体系,可以获得所需的手性支链α-烯丙基化的1,3-二酮,收率好至极好,具有良好的区域选择性和高对映选择性。该反应在两个反应伙伴上均显示出广泛的官能团耐受性,从而突出了其合成潜力。