Synthesis and Liquid Crystalline
Properties of 5-Alkyl-1,4-dioxane-2-carboxylic Esters
作者:Manfred Braun、Birgit Spieker、Antje Hahn、Volkmar Vill
DOI:10.1055/s-2002-34390
日期:——
The first route to 5-alkyl substituted and purely trans-configurated 1,4-dioxanecarboxylic acids 3 is described. The mesogenic properties of the esters 17 and 20, which are derived from the acids 3 and esters 19 (prepared from the hemiacetal 8a), are studied and compared. An enantioselective route to 1,4-dioxanecarboxylic acid 3a is explained, and takes advantage of the stereoselective addition of the bromolithioalkene 11b to heptanal.
描述了制备5-烷基取代和纯反式构型1,4-二氧杂环己烷羧酸3的第一条路线。研究并比较了源自酸3的酯17和源自半缩醛8a制备的酯19得到的酯20的液晶性质。阐述了制备1,4-二氧杂环己烷羧酸3a的手性选择性路线,并利用了溴锂烯烃11b对庚醛的立体选择性加成。