Optically Active Phospholanes as Substituents on Ferrocene and Chromium‐Arene Complexes
作者:Wolfgang Braun、Beatrice Calmuschi、Jürgen Haberland、Werner Hummel、Andreas Liese、Thomas Nickel、Othmar Stelzer、Albrecht Salzer
DOI:10.1002/ejic.200300685
日期:2004.6
An improved synthesis of (R,R)- and (S,S)-hexane-2,5-diol is presented. The (S,S)-derivative was converted into a cyclic sulfate, which on treatment with NaPH2 in liquid ammonia ultimately gave the secondary (R,R)-2,5-dimethylphospholane. This phospholane can be introduced into the side chain of chiral tricarbonylchromium and ferrocene derivatives to give new bidentate ligands of the Josiphos and Daniphos
提出了 (R,R)- 和 (S,S)-己烷-2,5-二醇的改进合成。(S,S)-衍生物转化为环状硫酸盐,在液氨中用 NaPH2 处理最终得到二级 (R,R)-2,5-二甲基磷烷。这种磷杂环戊烷可以引入手性三羰基铬和二茂铁衍生物的侧链,以产生新的 Josiphos 和 Daniphos 型双齿配体。二茂铁和三羰基铬基二膦均已通过 X 射线衍射分析表征。包括对其结构特征的讨论。新配体成功应用于衣康酸酯的对映选择性氢化。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)