Highly Enantioselective [4 + 2] Cycloaddition Reactions Catalyzed by a Chiral N-Methyl-oxazaborolidinium Cation.

[摘要]：provides a new route for the synthesis of oxazaborolidines. This method also leads to the first synthesis of hitherto elusive N-Me oxazaborolidine cations, specifically the cationic proline deriv. I. Compd. I is a strong chiral Lewis acid which is very effective for catalysis of [4 + 2]-cycloaddn. reactions in good yield and with high enantioselectivity. Several diverse examples illustrate the scope of these catalytic reactions.

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