Synthesis of New Enantiopure Fluorinated Phenylcyclopropanecarboxylates – Potential Chiral Dopants for Liquid-Crystal Compositions
作者:Svenja Hruschka、Roland Fröhlich、Peer Kirsch、Günter Haufe
DOI:10.1002/ejoc.200600579
日期:2007.1
mixture of diastereomeric monofluorinated cyclopropanes 5a and 6a. When using chiral RhII catalysts Rh2(TBSP)4 (7) and Rh2(DOSP)4 (8), the products were obtained enantioselectively in up to >99 % ee for both (1R,2R)-5a and (1R,2S)-6a. The fluorocyclopropane derivatives are of interest as dopants to induce chirality in liquid-crystal mixtures. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany,
在Rh 2 (OAc) 4 存在下,α-氟苯乙烯(1a)与苯基重氮乙酸甲酯的反应得到64:36的非对映单氟化环丙烷5a和6a混合物。当使用手性 RhII 催化剂 Rh2(TBSP)4 (7) 和 Rh2(DOSP)4 (8) 时,(1R,2R)-5a 和 (1R,2S) 的产物对映选择性高达 >99% ee -6a。氟环丙烷衍生物作为掺杂剂在液晶混合物中引起手性是令人感兴趣的。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)