Novel Friedel-Crafts Alkylation of Estrogens in the Presence of Anhydrous FeCl 3 or FeCl 3 -Graphite as Catalyst
作者:György Göndös、György Dombi
DOI:10.1007/s007060200106
日期:2002.9.1
The introduction of a tert-butyl group at position 2 of the A ring of estrogens leads to enhanced antioxidant effects. Therefore, a generally applicable and convenient method was developed using FeCl3-graphite or anhydrous FeCl3 as catalysts in the Friedel-Crafts alkylation of estrogens. The rates and yields of the alkylations were lower with FeCl3-graphite than with anhydrous FeCl3, but the regioselectivity of the former were higher. Both catalysts proved to be more effective than typical AlCl3.
Copper-Catalyzed Site-Selective Electrophilic Aromatic Alkylation of Monosubstituted Simple Arenes
作者:Wanting Fu、Jing Tian、Yuanli Ding、Xi Wang、Meiyan Wang、Zikun Wang
DOI:10.1021/acs.orglett.4c00475
日期:2024.4.5
A copper-catalyzed highly para-selective electrophilic aromatic alkylation of monosubstituted simple arenes has been accomplished. This method provides a practical platform for the transformation from simple commercial arenes to well-defined di- and multisubstituted aromatics with high added value. Control experiments and DFT calculations reveal that the achievement of the excellent site-selectivity