Asymmetric 1,4-Dihydroxylation of 1,3-Dienes by Catalytic Enantioselective Diboration
作者:Heather E. Burks、Laura T. Kliman、James P. Morken
DOI:10.1021/ja809610h
日期:2009.7.8
studies reported in this communication suggest that both cyclic and acyclic substrates will participate in this reaction; however, dienes which are unable to adopt the S-cis conformation are unreactive. For most substrates, 1,4-addition is the predominant pathway. In addition to oxidation to the derived 2-buten-1,4-diol, stereoselective carbonyl allylation with the intermediate bis(boronate) ester is
1,3-二烯的不对称 1,4-二羟基化和其他转化是由 Pt 催化的对映选择性添加双 (频哪醇) 二硼 (B(2)(pin)(2)) 到共轭二烯引发的。本通讯中报道的研究表明,环状和非环状底物都将参与该反应;然而,不能采用 S-顺式构象的二烯是不反应的。对于大多数底物,1,4-加成是主要途径。除了氧化为衍生的 2-丁烯-1,4-二醇之外,还描述了与中间体双(硼酸酯)酯的立体选择性羰基烯丙基化。