Organoyttrium-Catalyzed Sequential Cyclization/Silylation Reactions of Nitrogen-Heteroaromatic Dienes Demonstrating “Aryl-Directed” Regioselectivity
作者:Gary A. Molander、Monika H. Schmitt
DOI:10.1021/jo0000527
日期:2000.6.1
The reaction of 1-allyl-2-vinyl-1H-pyrroles and 1-allyl-2-vinyl-1H-indoles with arylsilanes in the presence of catalytic [Cp(TMS)(2)Y(&mgr;-Me)](2) leads to highly selective cyclization/silylation events. In this process the active catalyst for the reaction, "Cp(TMS)(2)YH", undergoes initial olefin insertion at the vinyl group. Even isopropenyl substituents on the heteroaromatics react in preference
Vitamin B<sub>12</sub>Catalyzed Radical Cyclizations of Arylalkenes
作者:Wilfred A. van der Donk、Chris M. McGinley、Heather A. Relyea
DOI:10.1055/s-2005-923588
日期:——
The use of vitamin B 1 2 for synthetic organic transformations has been extensively studied. Herein, we report the intramolecular cyclization reaction of a series of arylalkene substrates catalyzed by vitamin B 1 2 . Thesereactions proceed in good yields in environmentally benign solvents and do not require the use of a toxic heavy metal catalyst. Variation of the reaction pH can predictably alter
已经广泛研究了维生素 B 1 2 在合成有机转化中的应用。在此,我们报告了一系列由维生素 B 1 2 催化的芳基烯烃底物的分子内环化反应。这些反应在环境友好的溶剂中以良好的产率进行,并且不需要使用有毒的重金属催化剂。反应 pH 值的变化可以预测地改变产物分布。