1,3-Dipolar cycloaddition reaction applied to synthesis of new unsymmetric liquid crystal compounds-based isoxazole
作者:André A. Vieira、Fernando R. Bryk、Gilmar Conte、Adailton J. Bortoluzzi、Hugo Gallardo
DOI:10.1016/j.tetlet.2008.12.021
日期:2009.2
ring compounds exhibited mesomorphism. Smectic C, smectic A, and nematic phases were observed by optical microscopy and DSC analysis. The yield of these reactions varied from moderate to excellent (47–93%). The structure of the rigid core was investigated by single crystal X-ray diffraction, which confirmed the regioselectivity of the [3+2] dipolar cycloaddition reaction.
在这项研究中,开发了一种区域选择性,简单和通用的铜(I)催化方法,用于制备基于非对称3,5-二取代异恶唑的一系列液晶。使用不同的取代的氯肟和苯基乙炔,进行了1,3-偶极环加成反应。还合成了在刚性核中包含异恶唑环和三键的第二系列。由Sonogashira交叉偶联从3-(4-溴苯基)-5-(4-(癸氧基)苯基)异恶唑制备新的液晶化合物。异恶唑环化合物的所有衍生物均表现出同构。通过光学显微镜和DSC分析观察到近晶相C,近晶相A和向列相。这些反应的产率从中度到优异(47-93%)不等。