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。
Magnetic nano Fe3O4 and CuFe2O4 as heterogeneous catalysts: A green method for the stereo- and regioselective reactions of epoxides with indoles/pyrroles
this paper, we report a new solvent-free catalytic method using the magnetic nano Fe3O4 and CuFe2O4 as competent heterogeneous catalysts for the stereo- and regioselective reactions of epoxides with indoles/pyrroles, which gave the C-alkylated indoles/pyrroles. Chiral epoxides gave the alkylated indoles with a complete inversion of stereochemistry.
在本文中,我们报告了一种新的无溶剂催化方法,该方法使用磁性纳米Fe 3 O 4和CuFe 2 O 4作为有效的非均相催化剂,用于环氧化物与吲哚/吡咯的立体和区域选择性反应,使C-烷基化吲哚/吡咯。手性环氧化物使烷基化的吲哚具有完全的立体化学转化。
An efficient Friedel–Crafts alkylation of nitrogen heterocycles catalyzed by antimony trichloride/montmorillonite K-10
作者:Yu-Heng Liu、Qiu-Shuang Liu、Zhan-Hui Zhang
DOI:10.1016/j.tetlet.2008.12.022
日期:2009.2
It has been found that SbCl3 supported on montmorillonite K-10 is an efficient and reusable catalyst for Friedel–Crafts alkylation of nitrogenheterocycles such as indoles and pyrroles with epoxides. The reaction gives the corresponding C-alkylated derivatives in good to excellent yields with a high regioselectivity.
Friedel-Crafts alkylation of nitrogenheterocycles, such as indoles and pyrroles, can be carried out in ionic liquids under mild conditions to afford the corresponding alkylated product in moderate to good yields
A facile synthesis of alkylated nitrogen heterocycles catalysed by 3D mesoporous aluminosilicates with cage type pores in aqueous medium
作者:Rajashree Chakravarti、Pranjal Kalita、S. Tamil Selvan、Hamid Oveisi、V. V. Balasubramanian、M. Lakshmi Kantam、Ajayan Vinu
DOI:10.1039/b914628h
日期:——
Friedel–Crafts alkylation of nitrogenheterocycles such as indoles and pyrroles with epoxides has been efficiently carried out using cage-type mesoporous aluminosilicates as recyclable catalysts in water under environmentally benign and mild conditions.