Sc(OTf)3-Catalyzed or t-BuOK Promoted Tandem Reaction of 2-(2-(Alkynyl)benzylidene)malonate with Indole
摘要:
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.
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.
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.