Abstract
A poly trifluoromethylated chiral spirocyclic phosphoric acid was developed and employed with hexafluoroisoproyl alcohol (HFIP) to render the catalytic asymmetric Mukaiyama-Mannich reaction of difluoroenoxysilanes with in situ formed ketimines. This unique multiple-fluorine system provides rapid access to difluoromethylated tetrasubstituted stereocenters in isoindolones with wide substrate scope under mild conditions. Further synthetic transformations to enantioenriched CF2H-isoindolones and CF2-decorated fused isoindolones were also implemented with good efficiency.
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