Pd-C Assisted Synthesis of cis-2,4-Disubstituted γ-Butyrolactones and their Properties for Ferroelectric Liquid Crystals
作者:Kazuhiko Sakaguchi、Yasuo Kawamura、Sinichi Saito、Yasufumi Ohfune
DOI:10.1055/s-1997-3233
日期:1997.5
Cis isomers of optically active 2,3-disubstituted γ-butyrolactone, 1 - 4, as chiral dopants for ferroelectric liquid crystals (FLCs) are synthesized in a stereoselective manner via a Pd-C catalyzed hydrogenation of the endo CC double bond isomers of (4R)-2,4-disubstituted γ-butyrolactone, 23, 19, 20, and 21, respectively. The synthesis involved a novel exo to endo isomerization of the CC double bond effected by Pd-C in the absence of hydrogen.
合成了光学活性2,3-取代的γ-丁内酯的顺式异构体1-4,作为铁电液晶(FLCs)的手性掺杂剂,采用立体选择性的方法,通过Pd-C催化的氢化反应对(4R)-2,4-取代的γ-丁内酯的内异构体CC双键进行处理,分别得到化合物23、19、20和21。该合成涉及了一种新颖的由Pd-C在缺氢条件下促成的CC双键的外向到内向异构化过程。