Convenient Synthesis of Biphenyl-2-carboxylic Acids via the Nucleophilic Aromatic Substitution Reaction of 2-Methoxybenzoates by Aryl Grignard Reagents
作者:Tetsutaro Hattori、Takatsugu Suzuki、Noriyuki Hayashizaka、Nobuyuki Koike、Sotaro Miyano
DOI:10.1246/bcsj.66.3034
日期:1993.10
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。