Gold-Catalyzed Cyclization of 1-(Indol-3-yl)-3-alkyn-1-ols: Facile Synthesis of Diversified Carbazoles
作者:Zhen Zhang、Xiangying Tang、Qin Xu、Min Shi
DOI:10.1002/chem.201301203
日期:2013.8.5
Efficient cyclization of 1‐(indol‐3‐yl)‐3‐alkyn‐1‐ols in the presence of a cationic gold(I) complex, leading to annulated or specific substituted carbazoles, was observed. Depending on the reaction conditions and substitution pattern, divergent reaction pathways were discovered, furnishing diversified carbazole structures. Cycloalkyl‐annulated [b]carbazoles are obtained through 1,2‐alkyl migration
观察到在阳离子金(I)络合物存在下,1-(吲哚-3-基)-3-炔基-1-醇的有效环化导致环化或特定取代的咔唑。根据反应条件和取代方式,发现了不同的反应途径,提供了多样化的咔唑结构。环烷基环化的[ b ]咔唑是通过金属-卡宾中间体的1,2-烷基迁移获得的。环烷基环状的[ a ]咔唑是通过Wagner-Meerwein型的1,2-烷基转移形成的;咔唑醚是通过水或醇的亲核攻击通过环丙基的开环而构建的。