A Palladium-Catalyzed Ullmann Cross-Coupling/Reductive Cyclization Route to the Carbazole Natural Products 3-Methyl-9<i>H</i>-carbazole, Glycoborine, Glycozoline, Clauszoline K, Mukonine, and Karapinchamine A
作者:Qiao Yan、Emma Gin、Malgorzata Wasinska-Kalwa、Martin G. Banwell、Paul D. Carr
DOI:10.1021/acs.joc.7b00044
日期:2017.4.21
The title natural products 2–7 have been prepared by reductive cyclization of the relevant 2-arylcyclohex-2-en-1-one (e.g. 20) to the corresponding tetrahydrocarbazole and dehydrogenation (aromatization) of this to give the target carbazole (e.g. 4). Compounds such as 20 were prepared using a palladium-catalyzed Ullmann cross-coupling reaction between the appropriate 2-iodocyclohex-2-en-1-one and o-halonitrobenzene
标题天然产物2 - 7已经制备由相关2- arylcyclohex -2-烯-1-酮的还原性环化(例如,20)到相应的四氢咔唑和脱氢(芳构化)的此,得到目标咔唑(例如4)。使用合适的2-碘环己基-2-烯-1-酮与邻卤代硝基苯之间的钯催化的Ullmann交叉偶联反应,可以制备化合物(例如20)。