oxides and nitrones in the presence of Mg(II) cation as catalyst were evaluated. The presence of acetonitrile as co-solvent was found to be fundamental for the Lewis acid catalysis on solid-phase. The regio- and stereochemical outcome of nitrile oxide cycloadditions is influenced by nearly stoichiometric quantities of the cation, whilst catalytic amounts of Mg(II) influence both the reactivity and the
A new method has been demonstrated to solve the aggregation issue of metalcomplex catalysts; Steric protection of the metal center of catalysts was effective in the cases of DBFOX/Ph-transition metalcomplexes by structural modification of chiral ligand. The new ligands have been successfully applied to the nitrone cycloadditions to a variety of α,β-unsaturated aldehydes. Excellent enantioselectivities