A highly enantioselective aminalization of 2-aminobenzenesulfonamides and aldehydes catalyzed by a novel cyclopentadiene-based chiral carboxylic acid has been realized. The cost-effective and readily synthesized cyclopentadiene-based chiral carboxylic acid was found to be a highly reactive Brønsted acid for this transformation, affording benzothiadiazine class of cyclic aminals with up to 98% ee.
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