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Imines (1) cycloadd to cyclopentadiene and Indene to afford substituted tetrahydroquinolines with high diastereoisomeric (corresponding to enantiomeric) selectivity when (–)-8-phenylmenthol is used as a chiral auxiliary. Solvent polarity and temperature greatly affect the diastereoisomeric ratios.
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Borrione et al. (1989) studied this question.
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