Nucleophilic aromatic substitution (SNAr) of 2-methoxybenzoic esters derived from 2,6-dialkylphenols by aryl Grignard reagents affords 1,1′-biphenyl-2-carboxylates in excellent yields by proper choice of the bulk of the 2,6-dialkyl-substituents. The phenoxyl protecting groups can be easily removed from the resulting biphenyl-2-carboxylates to the free acids by treatment with potassium hydroxide in
Nucleophilic aromatic substitution (SNAr) of 2-methoxybenzoic esters derived from 2,6-dialkylphenols by aryl Grignard reagents affords 1,1′-biphenyl-2-carboxylates in excellent yields by proper choice of the bulk of the 2,6-dialkyl-取代基。通过用
乙醇水溶液(2,4,6-三甲基苯基和2,6-二异丙基苯基酯)中的
氢氧化钾或
甲苯中的
甲醇钠处理,苯氧基保护基团可以很容易地从生成的
联苯-2-
羧酸酯中去除,生成
游离酸。六甲基
磷酰胺(2,6-二叔丁基-4-甲基苯基酯)。通过 SNAr 过程的区域选择性
联苯偶联反应被用于正式合成
大麻酚中
联苯骨架的关键步骤构建。