作者:Felikss Mutulis、Adolf Gogoll、Ilze Mutule、Sviatlana Yahorava、Aleh Yahorau、Edvards Liepinsh、Jarl Wikberg
DOI:10.3390/molecules13081846
日期:——
Two molecules of indole derivative, e.g. indole-5-carboxylic acid, reacted with one molecule of thiol, e.g. 1,2-ethanedithiol, in the presence of trifluoroacetic acid to yield adducts such as 3-[2-(2-amino-5-carboxyphenyl)-1-(2-mercaptoethylthio)ethyl]-1Hindole-5-carboxylic acid. Parallel formation of dimers, such as 2,3-dihydro-1H,1'H-2,3'-biindole-5,5'-dicarboxylic acid and trimers, such as 3,3'-[2-(2-amino-5-carboxyphenyl) ethane-1,1-diyl]bis(1H-indole-5-carboxylic acid) of the indole derivatives was also observed. Reaction of a mixture of indole and indole-5-carboxylic acid with 2-phenylethanethiol proceeded in a regioselective way, affording 3-[2-(2-aminophenyl)-1-(phenethylthio)ethyl]-1H-indole-5-carboxylic acid. An additional product of this reaction was 3-[2-(2-aminophenyl)-1-(phenethylthio)ethyl]-2,3-dihydro-1H,1'H-2,3'-biindole-5'-carboxylic acid, which upon standing in DMSO-d6 solution gave 3-[2-(2-aminophenyl)-1-(phenethylthio)ethyl]-1H,1'H-2,3'-biindole-5'-carboxylic acid. Structures of all compounds were elucidated by NMR, and a mechanism for their formation was suggested.
在三氟乙酸存在下,两分子吲哚衍生物(如吲哚-5-羧酸)与一分子硫醇(如 1,2-乙二硫醇)反应生成加合物,如 3-[2-(2-氨基-5-羧基苯基)-1-(2-巯基乙硫)乙基]-1-吲哚-5-羧酸。此外,还观察到吲哚衍生物同时形成二聚体(如 2,3-二氢-1H,1'H-2,3'-联吲哚-5,5'-二羧酸)和三聚体(如 3,3'-[2-(2-氨基-5-羧基苯基)乙烷-1,1-二基]双(1H-吲哚-5-羧酸))。吲哚和吲哚-5-羧酸混合物与 2-苯基乙硫醇的反应以区域选择性方式进行,得到 3-[2-(2-氨基苯基)-1-(苯乙硫基)乙基]-1H-吲哚-5-羧酸。该反应的另一个产物是 3-[2-(2-氨基苯基)-1-(苯乙硫基)乙基]-2,3-二氢-1H,1'H-2,3'-联吲哚-5'-羧酸,在 DMSO-d6 溶液中静置后得到 3-[2-(2-氨基苯基)-1-(苯乙硫基)乙基]-1H,1'H-2,3'-联吲哚-5'-羧酸。所有化合物的结构都通过核磁共振得到了阐明,并提出了其形成机理。