Versatile Synthesis of Polyfunctionalized Carbazoles from (3-Iodoindol-2-yl)butynols via a Gold-Catalyzed Intramolecular Iodine-Transfer Reaction
作者:Benito Alcaide、Pedro Almendros、José M. Alonso、Eduardo Busto、Israel Fernández、M. Pilar Ruiz、Gulinigaer Xiaokaiti
DOI:10.1021/acscatal.5b00471
日期:2015.6.5
3-iodo 2,4,6-trisubstituted 9H-carbazoles has been developed by starting from (3-iodoindol-2-yl)butynols. These results could be explained through an initial 6-endo-dig alkyne carbocyclization by chemo- and regiospecific attack of the C3-indole position at the external alkyne carbon followed by a stepwise 1,3-iodine transfer and dehydration. This reaction outcome for the gold-catalyzed transformation
通过从(3-碘吲哚-2-基)丁炔醇开始开发了3-碘2,4,6-三取代的9 H-咔唑的可控金催化制备物。这些结果可以通过最初的6-内切式炔烃碳环化来解释,该过程是通过化学和区域特异性攻击外部炔烃碳上的C3-吲哚位置,然后逐步进行1,3-碘转移和脱水来进行的。金(3-碘吲哚-2-基)炔醇的转化反应结果与常规金属催化的碘代芳烃的反应结果形成鲜明对比,因为碘转移是可行的。已经通过实验研究了这种选择性反应。此外,已经通过密度泛函理论计算研究了其机理。