Stereospecific Synthesis of New Trioxadecalin-Derived Liquid Crystals Bearing Halogen Substituents on the Phenyl Ring
作者:Bruno Bertini、Christophe Moineau、Denis Sinou、Gunnar Gesekus、Volkmar Vill
DOI:10.1002/1099-0690(200101)2001:2<375::aid-ejoc375>3.0.co;2-j
日期:2001.1
presence of a catalytic amount of NiCl2(dppe) gives the corresponding β-C-aryl glycosides 4. Deacetylation and hydrogenation of 4 leads to the β-C-aryl glycosides 5, which can be used as chiral compounds in the synthesis of chiral liquid crystals. The reaction of compound 5 with aliphatic aldehydes leads to compounds 6; similarly, reaction with p-alkoxy-substituted phenylboronic acids gives the bora
假葡糖醛 2 与各种带有卤素取代基的芳基格氏试剂在催化量的 NiCl2(dppe) 存在下反应得到相应的 β-C-芳基糖苷 4。4 的脱乙酰和氢化产生 β-C-芳基苷5,可作为手性化合物用于手性液晶的合成。化合物5与脂肪醛反应生成化合物6;类似地,与对烷氧基取代的苯基硼酸反应得到硼酸类似物 7。所有介晶性质强烈依赖于分子结构的微小变化。可以获得多种不同的手性效应,例如螺旋反转、蓝相、TGA 相、胆甾相和近晶 A 相,仅举几例,