A Short Olefin Metathesis-Based Route to Enantiomerically Pure Arylated Dihydropyrans and α,β-Unsaturated δ-Valero Lactones
作者:Holger Wildemann、Pascal Dünkelmann、Michael Müller、Bernd Schmidt
DOI:10.1021/jo0264729
日期:2003.2.1
The synthesis of arylated dihydropyrans and unsaturated lactones starting from enantiomerically pure alpha-hydroxy ketones (prepared by an enzyme-catalyzed benzoin condensation) is described. The key steps are a highly diastereoselective addition of vinyl metal compounds under chelate control and a ruthenium-catalyzed ring-closing olefin metathesis reaction. Elucidation of the relative configuration
描述了从对映体纯的α-羟基酮(通过酶催化的安息香缩合制备)开始的芳基化的二氢吡喃和不饱和内酯的合成。关键步骤是在螯合物控制下高度非对映选择性地添加乙烯基金属化合物和钌催化的闭环烯烃复分解反应。最终产品的相对构型的阐明是通过NOE实验获得的。