Regio- and Enantioselective Friedel-Crafts Reactions of Indoles to Epoxides Catalyzed by Graphene Oxide: A Green Approach
作者:Maria Rosaria Acocella、Marco Mauro、Gaetano Guerra
DOI:10.1002/cssc.201402770
日期:2014.12
Graphene oxide efficiently promotes high regio‐ and enantioselective ring opening reactions of aromatic epoxides by indoles addition, in solvent‐ and metal‐free conditions. The Friedel–Crafts products were obtained with enantioselectivity up to 99 % ee. The complete inversion of stereochemistry indicates the occurrence of SN2‐type reaction, which assures high level of enantioselectivity.
在无溶剂和无金属的条件下,通过添加吲哚,氧化石墨烯可有效促进芳香族环氧化物的高区域和对映选择性开环反应。获得的Friedel-Crafts产品的对映选择性高达99%ee。立体化学的完全逆转表明发生了S N 2型反应,从而确保了高水平的对映选择性。