Regioselective Synthesis of Substituted Carbazoles, Bicarbazoles, and Clausine C
作者:Gary L. Points、Christopher M. Beaudry
DOI:10.1021/acs.orglett.1c02449
日期:2021.9.3
Substituted carbazoles are efficiently constructed from 3-triflato-2-pyrones and alkynyl anilines. Multiple substituents are tolerated on the carbazole, and complete control of regiochemistry is observed. Complicated and sterically congested substitution patterns are produced. This strategy is also used to prepare substituted bicarbazoles and related biaryls. Finally, the method was showcased in a
取代咔唑由 3-triflato-2-pyrones 和炔基苯胺有效构建。咔唑上可耐受多个取代基,并观察到对区域化学的完全控制。产生了复杂且空间拥挤的替代模式。该策略也用于制备取代的联咔唑和相关联芳基。最后,该方法在咔唑天然产物 clausine C 的合成中得到展示。
Efficient synthesis of aryl-substituted carbazoles via tandem double or triple suzuki coupling and cadogan cyclization
作者:Hyeong Seok Kim、Deuk-young Goo、Sang Kook Woo
DOI:10.1016/j.tet.2017.01.038
日期:2017.3
An efficient one-step method to prepare aryl-substituted carbazoles via tandem double or triple CC bond formations by multiple Suzukicouplings and CN bond formation by Cadogan cyclization has been developed. The developed method employs commercially available or easily preparable polybromonitrobenzenes and arylboronic acids as starting materials, tolerates various functional groups, and provides good
Gold-Catalyzed Deacylative Cycloisomerization Reactions of 3-Acylindole/ynes: A New Approach for Carbazole Synthesis
作者:Lu Wang、Guijie Li、Yuanhong Liu
DOI:10.1021/ol2012154
日期:2011.8.5
The synthesis of functionalized carbazoles through gold-catalyzed deacylative cycloisomerization of 3-acylindole/ynes is described. A mechanistic proposal for these transformations involving a novel carbonyl group facilitated heterolytic fragmentation upon the loss of an acylium ion intermediate is presented. The eliminated acylium ion species could be trapped by the organogold intermediate to afford
was established to be a crucial parameter for this transformation. When combined with DoM and traditional Pd-catalyzed Suzuki-Miyaura strategies, the methodology offers concise routes to uniquely substituted molecules, avoiding the need for protection/deprotection of the phenol and the use of strongly nucleophilic cross-coupling partners.