A Lewis acid-catalyzed stereoselective [3+2] annulation of crotylsilanes with iminooxindoles is reported to access 2,3'-pyrrolidinyl spirooxindoles with four stereocenters. The addition of NaBArF significantly enhances reactivity, allowing either metal salts or acidic clay to be effective catalysts for the stereoselective reaction.
A Lewis acid‐catalyzed stereoselective [3 + 2] annulation of crotylsilanes (II) and (V) with iminooxindoles (I) is reported providing access to pyrrolidinyl spirooxindoles (III) and (VI), resp., with four stereocenters.
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