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77955706573
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Other electrophiles were tested (2-methylpropanal, 1-butanal, chloral, 2-and 3-pyridine carboxaldehyde, benzaldehyde, phenyl glyoxal), and only traces of product were detected. Ethyl trifluoropyruvate delivered 42% yield
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Other electrophiles were tested (2-methylpropanal, 1-butanal, chloral, 2-and 3-pyridine carboxaldehyde, benzaldehyde, phenyl glyoxal), and only traces of product were detected. Ethyl trifluoropyruvate delivered 42% yield.
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77955691565
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2) was prepared and the obtained selectivities were identical to those of 3c (at 0 °C: 75% yield, 80:20 dr, 89:11 er)
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2) was prepared and the obtained selectivities were identical to those of 3c (at 0 °C: 75% yield, 80:20 dr, 89:11 er).
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See the Supporting Information for more details
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See the Supporting Information for more details.
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Only in rare cases were organocatalysts reported to be general syn-selective aldol catalysts
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Only in rare cases were organocatalysts reported to be general syn-selective aldol catalysts.
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α-Hydroxy ketones are known to deliver syn selectivity
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Kano, T.; Yamaguchi, Y.; Tanaka, Y.; Maruoka, K. Angew. Chem., Int. Ed. 2007, 46, 7606-7608. α-Hydroxy ketones are known to deliver syn selectivity;
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see: Ramasastry, S. S. V.; Zhang, H.; Tanaka, F.; Barbas, C. F., III. J. Am. Chem. Soc. 2007, 129, 288-289
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