Novel synthesis of liquid crystalline compounds of 5-substituted 2-(4-alkylphenyl)pyridines
作者:Win-Long Chia、Shih-Wei Shen、Hong-Cheu Lin
DOI:10.1016/s0040-4039(00)02196-1
日期:2001.3
study describes a novel and efficient synthesis of pyridine-containing liquid crystalline 5-substituted 2-(4-alkylphenyl)pyridines. 4-Alkylphenylmagnesium bromide was reacted with 3-substituted N-ethoxycarbonylpyridinium chloride to give regioselective 1,2-dihydropyridine intermediates, which were subsequently oxidized by o-chloranil. Good yields and high α-regioselectivity on the pyridine ring were observed
这项研究描述了新颖和有效的合成含吡啶液晶5-取代的2-(4-烷基苯基)吡啶。使4-烷基苯基溴化镁与3-取代的N-乙氧基羰基吡啶鎓氯化物反应,生成区域选择性的1,2-二氢吡啶中间体,随后将其通过邻氯苯甲酰氧化。在所有情况下,在吡啶环上均观察到良好的产率和高的α-区域选择性。