Facile synthesis of 5H-benzo[b]carbazol-6-yl ketones via sequential reaction of Cu-catalyzed Friedel–Crafts alkylation, iodine-promoted cyclization, nucleophilic substitution and aromatization
作者:Jing Wu、Dongping Wang、Haolong Wang、Fan Wu、Xincheng Li、Boshun Wan
DOI:10.1039/c4ob00815d
日期:——
A convenient method to access 5H-benzo[b]carbazol-6-ylketones via a sequential Cu-catalyzed Friedel–Crafts alkylation reaction of indoles with 2-(2-(alkynyl)benzylidene)malonates and iodine-promoted electrophilic cyclization followed by nucleophilic substitution and aromatization was developed. The products of the functional 5H-benzo[b]carbazol-6-ylketones were obtained with up to 98% yield.
一种方便的方法,该方法可通过连续的Cu催化的吲哚与2-(2-(炔基)亚苄基)丙二酸酯的碘化物的连续Fried-Crafts烷基化反应来获得5 H-苯并[ b ]咔唑-6-基酮,然后进行碘促进的亲电环化反应通过亲核取代和芳构化得到了发展。以高达98%的产率获得了功能性5 H-苯并[ b ]咔唑-6基酮的产物。
Efficient Assembly of 1-(1<i>H</i>-Imidazol-1-yl)-3-methylene-1<i>H</i>-indenes via Tandem Reaction of (2-(Alkynyl)benzylidene)malonates with Imidazoles
The tandem nucleophilic addition and 5-exo-cycliyition of (2-(alkynyl)benzylidene)malonates with imidazole derivatives in the presence of t-BuOK is reported. This reaction proceeds smoothly under mild conditions with high selectivity to afford the corresponding 1-(1H-imidazol-1-yl)3-methylene-1H-indene-2,2(3H)-dicarboxylates in good to excellent yields.
Sc(OTf)<sub>3</sub>-Catalyzed or <i>t</i>-BuOK Promoted Tandem Reaction of 2-(2-(Alkynyl)benzylidene)malonate with Indole
作者:Ke Gao、Jie Wu
DOI:10.1021/ol800664z
日期:2008.6.5
Tandem reaction of 2-(2-(alkynyl)benzylidene)malonate with indole was investigated. (Z)-1-Benzylidene-3-(1H-indol-1-yl)-1H-indene-2,2(3H)-dicarboxylate was generated in the presence of t-BuOK at room temperature; whereas 3-((1H-indol-3-yl)(2-(alkynyl)aryl)methyl)-1H-indole was obtained when Sc(OTf)(3) was utilized as catalyst at 50 degrees C.