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An enantioselective synthesis of 3-arylphthalides was achieved using (S)-1-phenylethylamine as a chiral auxiliary. Reduction of chiral keto amides of 2-aroylbenzoic acids followed by acid-catalyzed lactonization yielded (S)-3-arylphthalides with 75-85% ee.
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Karnik et al. (2008) studied this question.
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