Catalytic Asymmetric Epoxidation of α,β-Unsaturated Esters Using an Yttrium-Biphenyldiol Complex
作者:Hiroyuki Kakei、Riichiro Tsuji、Takashi Ohshima、Masakatsu Shibasaki
DOI:10.1021/ja052466t
日期:2005.6.1
We succeeded in a catalytic asymmetric epoxidation reaction of α,β-unsaturated esters via a conjugate addition of an oxidant using 2−10 mol % of the yttirium-chiral biphenyldiol catalyst. A variety of substrates with β-aryl and β-alkyl substituents were epoxidized efficiently, yielding the corresponding α,β-epoxy esters in up to 97% yield and 99% ee.
我们使用 2-10 mol% 的钇-手性联苯二醇催化剂通过氧化剂的共轭加成成功地进行了 α,β-不饱和酯的催化不对称环氧化反应。多种具有 β-芳基和 β-烷基取代基的底物被有效环氧化,产生相应的 α,β-环氧酯,产率高达 97%,ee 高达 99%。