A Surprising Substituent Effect Provides a Superior Boronic Acid Catalyst for Mild and Metal-Free Direct Friedel-Crafts Alkylations and Prenylations of Neutral Arenes
作者:Carolynne L. Ricardo、Xiaobin Mo、J. Adam McCubbin、Dennis G. Hall
DOI:10.1002/chem.201500020
日期:2015.3.9
for Friedel–Crafts alkylations is an important objective of interest toward the production of pharmaceuticals and commodity chemicals. Herein, 2,3,4,5‐tetrafluorophenylboronic acid was identified as a potent air‐ and moisture‐tolerant metal‐free catalyst that significantly improves the scope of direct Friedel–Crafts alkylations of a variety of slightly activated and neutral arenes, including polyarenes
Oxo-Rhenium-Catalyzed Radical Addition of Benzylic Alcohols to Olefins
作者:Chandrasekhar Bandari、Kenneth M. Nicholas
DOI:10.1021/acs.joc.9b03150
日期:2020.3.6
Although carbon radicals generated from a variety of alcohol derivatives have proven valuable in coupling and addition reactions, the direct use of alcohols as synthetically useful radical sources is less known. In this report, benzylic alcohols are shown to be effective radical precursors for addition reactions to alkenes when treated with triphenylphosphine or piperidine with the catalyst ReIO2(PPh3)2 (I)