Iminophenol Ligands Derived from Chiral Regioisomeric Hydroxy[2.2]paracyclophane-carbaldehydes: the Influence of the Substitution Pattern on Asymmetric Induction
作者:Dmitrii Yu. Antonov、Valeria I. Rozenberg、Tat'yana I. Danilova、Zoya A. Starikova、Henning Hopf
DOI:10.1002/ejoc.200700823
日期:2008.2
The planar-chiral 12-hydroxy[2.2]paracyclophane-4-carbaldehyde (3, pseudo-FHPC) was synthesized and resolved via its Schiff bases 9 using the enantiomers of α-phenylethylamine. The absolute configurations of the enantiomers of 3 were determined by X-ray diffraction. Derivatives 7–21, representatives of cyclophane-derived iminophenols with ortho, pseudo-gem and pseudo-ortho arrangement of the functional
合成了平面手性 12-羟基 [2.2] 对环芳烷-4-甲醛(3,假 FHPC),并使用 α-苯乙胺的对映异构体通过其席夫碱 9 进行拆分。3的对映异构体的绝对构型通过X射线衍射确定。衍生物 7-21 是环芳衍生的亚氨基酚的代表,其官能团具有邻位、伪宝石和伪邻位排列,被制备并研究作为催化剂,用于二乙基锌对苯甲醛的对映选择性加成,提供高达 97% 的预期醇ee。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)