Application of organolithium and related reagents in synthesis. Part 25: Novel specific synthesis of the 4-arylisochroman-3-acetic acids via conversion of benzoic acids
作者:Adam Bieniek、Jan Epsztajn、Justyna A Kowalska、Zbigniew Malinowski
DOI:10.1016/s0040-4039(01)02043-3
日期:2001.12
following sequence of reactions is described. At first, the 3-arylphthalides 3 were obtained via metallation [n-BuLi] of benzanilides 1 and subsequent treatment of the generated bis-lithiated anilides 2 with aromatic aldehydes. Next, the 3-arylphthalides 3 were reduced [LiBH4] to phthalanes 5 and then, via reductive metallation [Li/C10H8] and reaction of the generated bis-lithiated species 6 with dimethylformamide
描述了使用以下反应序列将苯甲酰苯胺1转化为4-芳基异色满-3-乙酸8。首先,将3- arylphthalides 3通过金属化,得到[ Ñ正丁基锂] benzanilides的1和所产生的双-锂化的N-酰苯胺的后续处理2与芳香醛。接下来,将3-芳基邻苯二甲酸酯3 [LiBH 4 ]还原为邻苯二甲酰基5,然后通过还原金属化[Li / C 10 H 8 ]和生成的双锂化物种6反应用二甲基甲酰胺制备3-羟基-4-芳基异色团7。在最后一步中,在四氯化钛存在下,用1-甲氧基-1-三甲基甲硅烷基氧化乙烯处理异色满7,并提供4-芳基异色满-3-乙酸甲酯8,为反式立体异构体(I-e / e)。