Synthesis of Tricyclic Indole-2-caboxylic Acids as Potent NMDA-Glycine Antagonists
作者:Seiji Katayama、Nobuyuki Ae、Ryu Nagata
DOI:10.1021/jo010002h
日期:2001.5.1
monocarboxylic acid 16 on a multihundred gram scale without any chromatographic purifications. Optical resolution of 16 to (-)-isomer 17 and (+)-isomer 18 was carried out, and the resulting isomers were derivatized, respectively. Evaluation of the optically active derivatives for affinity to the NMDA-glycine binding site using the radio ligand binding assay with [(3)H]-5,7-dichlorokynurenic acid revealed
实用合成一系列三环吲哚-2-羧酸,7-氯-3-芳基氨基羰基甲基-1,3,4,5-四氢苯并[cd]吲哚-2-羧酸,作为一类新的强效NMDA-描述了甘氨酸拮抗剂。到关键中间体12a的合成途径包括4-氯-2-硝基甲苯的区域选择性碘化,改良的Reissert吲哚合成,与烯丙醇的Jeffery's Heck型反应,Wittig-Horner-Emmons反应以及在吲哚C-3处的碘化位置。该途径中的关键步骤是分子内环化12a以得到三环吲哚结构。进行了两种环化方法,(1)12a的分子内自由基环化和(2)12a的分子内Heck反应序列,然后进行1,4还原。将得到的三环吲哚二酯13a选择性地水解,以数百克的规模提供所需的三环吲哚一元羧酸16,而无需进行任何色谱纯化。进行16至(-)-异构体17和(+)-异构体18的光学拆分,并将所得的异构体分别衍生化。使用[(3)H] -5,7-二氯基尿酸进行放射性配体结合