A chiral phosphoric acid-catalyzed
kinetic resolution of tertiary
allylic alcohols was developed to provide structurally valuable enantioenriched
2,2-disubstituted tetrahydrofurans, tetrahydropyrans, and oxepane.
A variety of tertiary allylic alcohols were resolved with selectivity
factors of ≤120. A tertiary allylic carbocationic intermediate
mediates the enantioselective intramolecular substitution to achieve
high regio- and enantioselectivity. A gram-scale reaction with low
catalyst loading and subsequent transformations of the recovered alcohols
and products demonstrated the utility of this method.
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