Persulphate oxidation of carboxylic acids. Part III. Oxidation of cis-cinnamic and biphenyl-2-carboxylic acids
作者:P. Margaret Brown、J. Russell、R. H. Thomson、A. G. Wylie
DOI:10.1039/j39680000842
日期:——
3,4-Benzocoumarins were obtained by oxidative cyclisation of biphenyl-2-carboxylic acids. The parent benzocoumarin was also formed by oxidation of 2′-substituted acids with elimination of the substituent (OMe, NO2, and CO2H and in low yield Me and Cl) but 2′-benzoylbiphenyl-2-carboxylic acid gave 5-benzoyl-3,4-benzocoumarin and 2′-cyanobiphenyl-2-carboxylic acid yielded fluorenone and phenanthridine-1
通过联苯-2-羧酸的氧化环化获得3,4-苯并香豆素。母体苯并香豆素也通过氧化2'-取代的酸并消除取代基(OMe,NO 2和CO 2 H并以低收率的Me和Cl形成)形成,但是2'-苯甲酰基联苯-2-羧酸可产生5-苯甲酰基-3,4-苯并香豆素和2'-氰基联苯-2-羧酸生成芴酮和菲啶-1,10-碳内酯。顺式肉桂酸的类似氧化产生香豆素的产率很低,由于存在邻甲氧基而显着增加了香豆素的产率。讨论了这些反应的机理。