Synthesis of chlorinated and non-chlorinated biphenyl-2,3- and 3,4-catechols and their [<sup>2</sup>H<sub>3</sub>]-isotopomers
作者:Po-Hsiung Lin、R. Sangaiah、Asoka Ranasinghe、Louise M. Ball、James A. Swenberg、Avram Gold
DOI:10.1039/b409373a
日期:——
described for chlorinated biphenyl-2,3- and 3,4-catechols to be used as standards for structural assignment of metabolites and protein adducts of 2,2',5,5'-tetrachlorobiphenyl in which both rings retain chlorine substituents. The scheme has general applicability to the synthesis of chlorinated biphenyl catechols. Dimethyl catechol ethers are coupled to dichloroaniline via the Cadogan reaction to give a
描述了一种合成方案,用于氯化联苯-2,3-和3,4-儿茶酚,用作2,2',5,5'-四氯联苯的代谢物和蛋白质加合物的结构分配标准,其中两个环均保留氯取代基。该方案一般适用于氯化联苯邻苯二酚的合成。二甲基邻苯二酚醚通过Cadogan反应与二氯苯胺偶联,得到异构体库,然后将醚与BBr3脱甲基,得到目标邻苯二酚。根据异构体混合物的不同,在脱甲基之前或之后通过TLC或HPLC分离纯净的异构体。在偶联反应中,使用2,5-二氯苯胺-d3作为起始芳基胺生成[2H3]-异构体。二氯苯胺-d3盐酸盐是对-二氯苯-d4进行硝化,然后在强酸性条件下进行Pd / C催化氢化的唯一产物。该氢化方法提供了一种在卤素环取代基存在下选择性还原芳基硝基的简便方法。