Synthesis of Diverse Indole-Containing Scaffolds by Gold(I)-Catalyzed Tandem Reactions of 3-Propargylindoles Initiated by 1,2-Indole Migrations: Scope and Computational Studies
作者:Roberto Sanz、Delia Miguel、Mukut Gohain、Patricia García-García、Manuel A. Fernández-Rodríguez、Adán González-Pérez、Olalla Nieto-Faza、Ángel R. de Lera、Félix Rodríguez
DOI:10.1002/chem.201001162
日期:2010.8.23
Similar to propargylic carboxylates and sulphides, 3‐propargylindoles undergo 1,2‐indole migrations under cationic gold(I) catalysis. The intermediate Au–carbenoid complex may evolve through different pathways depending on the substituents at the propargylic and terminal positions of the alkyne moiety. Thus, 3‐indenylindole derivatives were easily obtained through formal iso‐Nazarov or Nazarov cyclizations
类似于炔丙基羧酸盐和硫化物,3-炔丙基吲哚在阳离子金(I)催化下经历1,2-吲哚迁移。取决于炔基部分的炔丙基和末端位置的取代基,中间的金-类胡萝卜素配合物可能通过不同的途径演化。因此,可以通过正式的iso-Nazarov或Nazarov环化轻松获得3-茚基吲哚衍生物。DFT计算支持形成亚烷基环丙烷中间体,该中间体在选择环开环后会经历金-异-纳扎罗夫或金-纳扎罗夫的环化反应。此外,3-dienylindoles可以访问时没有提到途径是可访问的,因此,中间的Au-卡宾络合物经由1,2--C进化H插入反应。我们还证明了最终产品可以通过一锅法从容易获得的炔丙醇和吲哚获得。