Preparation, coordination and catalytic use of planar-chiral monocarboxylated dppf analogues
作者:Martin Lamač、Ivana Císařová、Petr Štěpnička
DOI:10.1039/b901262a
日期:——
acid (Hdpc), has been synthesised in racemic form and resolved into enantiomers via esters with D-glucose diacetonide ((Rp)- and (Sp)-3). (Rp)-Hdpc was further converted to a series of N-substituted amides that were studied as ligands for Pd-catalysed enantioselective allylic alkylation of racemic (E)-1,3-diphenylprop-2-en-1-yl acetate or ethyl carbonate with malonate esters, showing high activity and
仅具有平面手性,1'的新型极性DPPF衍生物,1,2-双(二苯基膦基) -二茂铁-1-羧酸(HDPC),已被外消旋形式合成并拆分成的对映体通过用酯d -葡萄糖二丙酮化合物((ř p)-和(S p)-3)。(R p)-Hdpc进一步转化为一系列N-取代的酰胺,这些酰胺已作为Pd催化的外消旋对映选择性烯丙基烷基化的配体进行了研究(E)-1,3-二苯基丙-2-烯-1-基乙酸酯或碳酸与丙二酸酯的乙酯,显示出高活性和良好的对映选择性(高达10:90)。与结构数据(X射线衍射和溶液NMR)对(η催化结果相关3 -烯丙基)合钯(II)络合物([R p [钯(η - )3 -1,3-PH 2 Ç 3 ħ 3)的Fe(η 5 -C 5 H ^ 3 -1-(C(O)NHCH 2 PH)-2-(PPH 2 -κ P))(η 5 -C 5 H ^ 4 PPH 2 -κ P)} ] ClO 4(16)作为合理的反