Reactions and Mechanistic Studies of Rhenium-Catalyzed Insertion of α,β-Unsaturated Carbonyl Compounds into a C–H Bond
作者:Yoichiro Kuninobu、Yuta Nishina、Kayo Okaguchi、Makoto Shouho、Kazuhiko Takai
DOI:10.1246/bcsj.81.1393
日期:2008.11.15
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
铼络合物[ReBr(CO) 3 (thf)] 2 催化α,β-不饱和羰基化合物插入具有含氮导向基团的芳族化合物的CH键中。在该反应中,Re 2 (CO) 10 也可用作催化剂。当使用亚胺作为芳族底物时,顺序环化进行,并以良好至极好的产率获得茚衍生物。这种反应性与钌和铑配合物的反应性相反,钌和铑配合物通常用作不饱和分子插入 CH 键的催化剂。对反应机理的研究表明,铼催化剂促进了芳香族化合物的 CH 键活化,α,β-不饱和羰基化合物插入 Re-C 键,