Rhodium-Catalyzed Asymmetric Ring Opening Reactions of Oxabicyclic Alkenes: Application of Halide Effects in the Development of a General Process
作者:Mark Lautens、Keith Fagnou、Dingqiao Yang
DOI:10.1021/ja034845x
日期:2003.12.1
effects in the rhodium-catalyzed asymmetric ringopening reaction of oxabicyclicalkenes. By employing halide and protic additives, the catalyst poisoning effect of aliphatic amines is reversed allowing the amount nucleophile to react in high yield and ee. Second, by simply changing the halide ligand on the rhodium catalyst from chloride to iodide, the reactivity and enantioselectivity of reactions employing
我们已经在铑催化的氧杂双环烯烃的不对称开环反应中证明了卤化物效应。通过使用卤化物和质子添加剂,脂肪胺的催化剂中毒效应被逆转,允许一定量的亲核试剂以高产率和 ee 反应。其次,通过简单地将铑催化剂上的卤化物配体从氯化物变为碘化物,使用芳香胺、丙二酸酯或羧酸盐亲核试剂的反应的反应性和对映选择性得到显着提高。第三,通过应用卤化物效应和更强制的反应条件,反应性较低的氧杂二环 [2.2.1] 底物反应生成合成有用的对映体富集的环己烯醇产物。
Novel compounds and a novel process for their preparation
申请人:Fagnou Keith
公开号:US20050014721A1
公开(公告)日:2005-01-20
The present invention is directed to a procedure for making an enantiomerically enriched compound containing a hydronaphthalene ring structure. The process involves reacting oxabenzonorbornadienes with nucleophiles using rhodium as a catalyst and in the presence of a phosphine ligand. The compounds synthesized may be used in pharmaceutical preparations for the treatment of a variety of diseases and conditions.
Novel hydronaphthalene compounds, prepared by a rhodium catalysed ring opening reaction in the presence of phosphine ligand
申请人:AstraZeneca AB
公开号:EP1498406A1
公开(公告)日:2005-01-19
The present invention is directed to a procedure for making an enantiomerically enriched compound containing a hydronaphthalene ring structure. The process involves reacting oxabenzonorbornadienes with nucleophiles using rhodium as a catalyst and in the presence of a phosphine ligand. The compounds synthesized may be used in pharmaceutical preparations for the treatment of a variety of diseases and conditions.
As an efficient catalyst, the [Ir(COD)CI](2)/NMDPP complex has been successfully applied to promote the asymmetric ring opening reaction of oxabenzonorbornadienes with various amines, which afforded the corresponding products in good yields (72-98%) with good enantioselectivities (80-90% ee). (C) 2014 Published by Elsevier Ltd.
Effects of Halide Ligands and Protic Additives on Enantioselectivity and Reactivity in Rhodium-Catalyzed Asymmetric Ring-Opening Reactions