The synthesis of 1,2,3-trisubstituted indoles was investigated. More specifically, straightforward synthetic routes towards 1-(1,2-diarylindol-3-yl)-N-PG-THIQs (PG = protecting group, THIQ = tetrahydroisoquinoline) employing transition metal-catalyzed C–H and N–H-bond functionalization were explored. It was found that the synthesis of the target compounds is strongly dependent on the order of events. Hence, depending on the requirements of a synthetic problem the most suitable and promising pathway can be chosen. Additionally, a new synthetic approach towards 1,2-diarylindoles starting from 1-arylindole could be established in the course of our investigation by using a palladium-catalyzed protocol. Such 1,2-diarylindoles were successfully reacted with N-Boc-THIQ to furnish 1,2,3-trisubstituted indoles as target compounds. Furthermore, regioselective N-arylation of protected and unprotected 1-(indol-3-yl)-THIQs was successfully conducted using either simple iron or copper salts as catalysts.
对1,2,3-三取代吲哚的合成进行了研究。更具体地,探索了通过过渡金属催化的C-H和N-H键官能化的直接合成途径,以制备1-(1,2-二芳基吲哚-3-基)-N-PG-THIQs(PG = 保护基,THIQ = 四氢异喹啉)。发现目标化合物的合成强烈依赖于事件的顺序。因此,根据合成问题的要求,可以选择最合适和最有前途的途径。此外,在我们的研究过程中,通过使用钯催化的方法,建立了从1-芳基吲哚出发合成1,2-二芳基吲哚的新合成方法。这种1,2-二芳基吲哚成功地与N-Boc-THIQ反应,生成1,2,3-三取代吲哚作为目标化合物。此外,使用简单的铁盐或铜盐作为催化剂,成功地对受保护和未受保护的1-(吲哚-3-基)-THIQ进行了区域选择性N-芳基化反应。