Planar chiral hydroxy derivatives of [2.2]paracyclophane as auxiliaries for asymmetric allylboration
作者:N. V. Vorontsova、R. P. Zhuravsky、E. V. Sergeeva、E. V. Vorontsov、Z. A. Starikova、V. I. Rozenberg
DOI:10.1007/s11172-007-0348-x
日期:2007.11
based on [2.2]paracyclophane derivatives containing one or two hydroxy groups. It was demonstrated that these esters can be used as chiral inductors in the asymmetric allylboration of benzaldehyde. The highest enantiomeric excess of 1-phenylbut-3-en-1-ol (60%) was achieved in the reactions with acyclic bis-O,O′-(paracyclophanyl) allylboronates based on (S)-4-hydroxy-and (S)-12-bromo-4-hydroxy[2.2]paracyclophanes
首次以含有一个或两个羟基的[2.2]对环芳烷衍生物为基础合成了各种结构的烯丙基硼酸酯。结果表明,这些酯可在苯甲醛的不对称烯丙基硼化反应中用作手性诱导剂。在与基于 (S)-4-羟基-和 (S)-4-羟基的无环双-O,O'-(对环芳基)烯丙基硼酸酯的反应中实现了最高对映体过量的 1-苯基丁-3-烯-1-醇 (60%) S)-12-溴-4-羟基[2.2]对环芳烃。(S)-4-Hydroxy[2.2]paracyclophane 通过 X 射线衍射进行了研究。