Abstract
| - The mechanism of the enantioselective, hydrazide-catalyzedDiels−Alder cycloaddition was investigated in detail. Boththe formation of the reactive iminium species and thehydrolysis of the product iminium intermediates were foundto be extremely rapid, leaving the cycloaddition as thekinetically significant step. Mechanistic studies using NMRshowed that a retro-Diels−Alder reaction occurred duringthe catalytic cycle, suggesting a thermodynamic componentto the reaction.
|