Sonogashira Coupling Applied in the Synthesis of 1,2,4-Oxadiazole-Based Nonsymmetrical Liquid Crystals
作者:Hugo Gallardo、Rajendra Srivastava、Rodrigo Cristiano、André Vieira、Ricardo Neves Filho
DOI:10.1055/s-2008-1032156
日期:2008.2
A series of highly Ï-conjugated nonsymmetrical liquid crystals, based on the core 3,5-(disubstituted)-1,2,4-oxadiazole with a shape similar to a hockey stick, were successfully synthesized by convergent Sonogashira coupling reaction between the building blocks of aryl iodides and the corresponding terminal arylacetylenes, using 3-[4-(decyloxy)phenyl]-5-(haloaryl)-1,2,4-oxadiazoles or decyl 4-iodobenzoate (10) and terminal arylacetylenes. This versatile synthetic route yielded luminescent mesogens with smectic and nematic phases, typical of calamitic compounds.
以 3,5-(二取代)-1,2,4-噁二唑为核心,成功合成了一系列高度Ï-共轭的非对称液晶,其形状类似曲棍球棒、的 3-[4-(癸氧基)苯基]-5-(卤代芳基)-1,2,4-恶二唑或 4-碘苯甲酸癸酯 (10) 和末端芳基乙炔,通过芳基碘化物和相应末端芳基乙炔构建模块之间的收敛性 Sonogashira 偶联反应,成功合成了这种液晶。这种多用途的合成路线产生了具有钙钛矿化合物典型的熔融相和向列相的发光介质。