Synergistic Catalysis of Anthrone Diels−Alder Reactions
作者:Roy Harrison、Bruce Rickborn
DOI:10.1021/ol025760o
日期:2002.5.1
[reaction: see text] The combination of an amine base and Lewis acid (Li+) leads to synergistic catalysis of the Diels-Alderreaction of anthrone with methyl crotonate and some other less reactive dienophiles. These cycloadditions either do not occur with the individual catalysts used separately or they are greatly accelerated by the combined catalysts. DMSO solvent allows the use of LiCl as the Lewis