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 ringopeningreactions 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。
Computational Study-Led Organocatalyst Design: A Novel, Highly Active Urea-Based Catalyst for Addition Reactions to Epoxides
作者:Eimear M. Fleming、Cormac Quigley、Isabel Rozas、Stephen J. Connon
DOI:10.1021/jo702154m
日期:2008.2.1
catalyst for the promotion of additionreactions to epoxide electrophiles. Synthesis and evaluation of 6 revealed it to be a powerful catalyst for the addition of 1,2-dimethylindole to styrene oxide under conditions in which simple N,N-bis-aryl ureas and thioureas (including 1) are inactive. Subsequent studies determined 6 to be compatible with a range of indole and epoxide substrates (including (E)-stilbene