Rhodium-catalyzed 1,4-addition of alkenylzirconocene chlorides to electron deficient alkenes
作者:Akito Kakuuchi、Takeo Taguchi、Yuji Hanzawa
DOI:10.1016/j.tet.2003.08.073
日期:2004.2
acid esters, and α,β-enoic acid amides can be efficiently achieved by the use of [RhCl(cod)]2 catalyst. A high diastereoselectivity (95% yield, 90% de) was obtained through the reaction of α,β-enoic acid amide derived from Oppolzer's sultam and 2-butenoyl chloride, while the use of Evans' chiral oxazolidinone as a chiral auxiliary in place of Oppolzer's sultam gave a poor diastereoselectivity (98% yield
通过使用[RhCl(cod)] 2催化剂可有效地将烯基氯化锆烯属化合物的1,4-共轭加成到α,β-烯酮,α,β-烯酸酯和α,β-烯酸酯中。通过衍生自Oppolzer's sultam的α,β-烯酸酰胺与2-丁烯酰氯的反应获得了较高的非对映选择性(95%收率,90%de),而使用Evans的手性恶唑烷酮代替手性助剂Oppolzer的sultam的非对映选择性差(98%的收率,26%的de)。