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77951188148
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note
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Aliphatic aldehydes were also investigated. The reaction of cyclohexanecarbaldehyde sluggishly proceeded to give the corresponding products with 23% ee in 25% yield. Isobutyraldehyde and pivalaldehyde only provided the racemic products in 21% and 56% yields, respectively. The distinct performance of the aromatic and aliphatic aldimines suggested that a JT-JT interaction might exist between the aromatic aldimine and the aromatic ring of the catalyst, which played a crucial role in the asymmetric inducing of the reaction. [10] A scaled-up reaction of benzaldehyde was also performed which is thirty-fold larger (3 mmol) than the model reaction (0.1 mmol) and the vinylogous Mannich product 4a was produced with 80% ee and in 96% yield.
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