使用铱催化的不对称氢化反应制备了几种手性磺酰基化合物。研究了乙烯基、烯丙基和高烯丙基砜的取代,无论烯烃相对于砜的位置如何,都保持了高对映选择性。二烷基取代获得了令人印象深刻的立体选择性,这通常是氢化中具有挑战性的底物。正如预期的那样,体积更大的 Z 底物比相应的 E 异构体氢化得更慢,并且对映选择性略低。
Enantioselective Synthesis of Chiral Sulfones by Ir-Catalyzed Asymmetric Hydrogenation: A Facile Approach to the Preparation of Chiral Allylic and Homoallylic Compounds
作者:Taigang Zhou、Byron Peters、Matías F. Maldonado、Thavendran Govender、Pher G. Andersson
DOI:10.1021/ja306731u
日期:2012.8.22
A highly efficient and enantioselective Ir-catalyzed hydrogenation of unsaturatedsulfones was developed. Chiral cyclic and acyclic sulfones were produced in excellent enantioselectivities (up to 98% ee). Coupled with the Ramberg-Bäcklund rearrangement, this reaction offers a novel route to chiral allylic and homoallylic compounds in excellent enantioselectivities (up to 97% ee) and high yields (up
开发了一种高效且对映选择性 Ir 催化的不饱和砜加氢反应。以优异的对映选择性(高达 98% ee)生产手性环状和无环砜。与 Ramberg-Bäcklund 重排相结合,该反应提供了一种获得具有优异对映选择性(高达 97% ee)和高产率(高达 94%)的手性烯丙基和同型烯丙基化合物的新途径。