Lanthanide trifluoromethanesulfonates as reusable catalysts. Michael and Diels-Alder reactions

Article abstract of DOI:10.1016/S0040-4039(00)61783-5

The Michael reaction of silyl enolates with α,β-unsaturated ketones and the Diels-Alder reaction of carbonyl containing dienophiles are catalyzed by a catalytic amount of lanthanide trifluoromethanesulfonate to give the corresponding adducts in high yields. In both reactions, the catalyst can be recovered and reused.