A New Target for Highly Stereoselective Katsuki–Sharpless Epoxidation – One-Pot Synthesis ofC2-Symmetric 2,2′-Bioxiranes
作者:Vitaliy Bilenko、Haijun Jiao、Anke Spannenberg、Christine Fischer、Helmut Reinke、Jutta Kösters、Igor Komarov、Armin Börner
DOI:10.1002/ejoc.200600711
日期:2007.2
The double asymmetric Katsuki–Sharpless epoxidation of a conjugated diallyl alcohol affords excellent enantioselectivity (>97 % ee), the product being isolated as the stable p-nitrobenzoate 5a or tosylate 5b. The optical purities of the chiral epoxides were determined by HPLC on chiral columns, while the molecular structures of compounds 5a and 7 and the absolute configuration of mono-epoxide 12 were
共轭二烯丙醇的双不对称 Katsuki-Sharpless 环氧化提供了出色的对映选择性 (>97% ee),产物被分离为稳定的对硝基苯甲酸酯 5a 或甲苯磺酸酯 5b。手性环氧化物的光学纯度通过手性柱上的 HPLC 测定,而化合物 5a 和 7 的分子结构以及单环氧化物 12 的绝对构型由 X 射线晶体学证实。可能的 π–π 堆积相互作用已通过从头计算来评估。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)