137600-70-5Relevant academic research and scientific papers
Practical synthesis of 4'-methylbiphenyl-2-carboxylic acid
Hattori,Hayashizaka,Miyano
, p. 41 - 43 (2007/10/02)
Treatment of 2,6-di-tert-butyl-4-methylphenyl 2-methoxybenzoate (5) with 4-methylphenylmagnesium bromide (6) in diethyl ether-benzene affords the 4'-methylbiphenyl-2-carboxylate (7) in excellent yield via an ester-assisted nucleophilic aromatic substitution (S(N)Ar) reaction. Carboxylate 7 is in turn readily and quantitatively saponified to 4'-methylbiphenyl-2-carboxylic acid (2a) via transesterification by treatment with sodium methoxide in toluene-1-methyl-2-pyrrolidone followed by aqueous hydrolysis.
Convenient Synthesis of Biphenyl-2-carboxylic Acids via the Nucleophilic Aromatic Substitution Reaction of 2-Methoxybenzoates by Aryl Grignard Reagents
Hattori, Tetsutaro,Suzuki, Takatsugu,Hayashizaka, Noriyuki,Koike, Nobuyuki,Miyano, Sotaro
, p. 3034 - 3040 (2007/10/02)
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 aqueous ethanol (2,4,6-trimethylphenyl and 2,6-diisopropylphenyl esters) or sodium methoxide in toluene-hexamethylphosphoric triamide (2,6-di-t-butyl-4-methylphenyl esters). The regioselective biphenyl coupling reaction via the SNAr process is utilized for the key-step construction of the biphenyl skeleton in a formal synthesis of cannabinol.
