Palladium-Catalyzed Synthesis of Natural and Unnatural 2-, 5-, and 7-Oxygenated Carbazole Alkaloids from N-Arylcyclohexane Enaminones
作者:Rafael Bautista、Pablo Montoya、Araceli Rebollar、Eleuterio Burgueño、Joaquín Tamariz
DOI:10.3390/molecules180910334
日期:——
A palladium-catalyzed synthesis of the carbazole framework is described, including the preparation of 2-, 5-, and 7-oxygenated natural and unnatural carbazole alkaloids. A series of N-arylcyclohexane enaminones, generated by condensation of cyclohexane-1,3-dione with diverse anilines, were aromatized by a Pd(0)-catalyzed thermal treatment to afford the corresponding diarylamines. The latter were submitted
描述了钯催化合成咔唑骨架,包括制备 2-、5-和 7-氧化的天然和非天然咔唑生物碱。由环己烷-1,3-二酮与多种苯胺缩合生成的一系列 N-芳基环己烷烯胺酮通过 Pd(0) 催化热处理芳构化,得到相应的二芳基胺。后者被提交给 Pd(II) 催化的环化和甲基化过程,以提供所需的咔唑,包括 clausine V。按照相反的策略,还报道了一种新的和短的糖硼素全合成。