A rhenium complex, [ReBr(CO) 3 (thf)] 2 , catalyzes the insertion of α,β-unsaturated carbonyl compounds into a C-H bond of aromatic compounds having nitrogen-containing directing groups. In this reaction, Re 2 (CO) 10 can also be used as a catalyst. When imines are employed as the aromatic substrates, sequential cyclization proceeds and indene derivatives are obtained in good to excellent yields. This
Sequential Ruthenium-Catalyzed Hydroamination and Rhenium-Catalyzed C−H Bond Activation Leading to Indene Derivatives
作者:Yoichiro Kuninobu、Yuta Nishina、Kazuhiko Takai
DOI:10.1021/ol0611292
日期:2006.6.1
[reaction: see text] Formal [3 + 2] annulation of arylacetylenes and alpha,beta-unsaturated carbonyl compounds is achieved in a one-pot reaction by successive treatment of the acetylenes with aniline and a catalytic amount of Ru(3)(CO)(12) and NH(4)PF(6) and C-H bond activationcatalyzed by [ReBr(CO)(3)(thf)](2). The result suggests that the second rhenium-catalyzed indene formation is not disturbed