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These reactions required the use of 20 mol% of fluoride source be-cause a 10 mol% was consumed by the silyl prolinol ether 4
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These reactions required the use of 20 mol% of fluoride source be-cause a 10 mol% was consumed by the silyl prolinol ether 4.
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Lower yields were obtained if the reaction was performed in two consecutive reactions. Under these conditions, the Michael adduct was obtained in 80% yield, which suggests an average yield of around 75% for each one of the Henry reactions involved in the one-pot process.
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Lower yields were obtained if the reaction was performed in two consecutive reactions. Under these conditions, the Michael adduct was obtained in 80% yield, which suggests an average yield of around 75% for each one of the Henry reactions involved in the one-pot process.
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We have tried aromatic a,β-unsaturated aldehydes under different conditions and catalysts without any conversion
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We have tried aromatic a,β-unsaturated aldehydes under different conditions and catalysts without any conversion.
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These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via
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CCDC-718713 (7b) contains the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam. ac.uk/data-request/cif.
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CCDC-718713 (7b) contains the supplementary crystallographic data for this paper
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Reactions with nitroethane afforded mixtures of diastereoisomers, which is expected because the presence of an additional methyl group on the ring distorts the ideal all-trans relationship achieved for all substituents in compounds 7, indicating that several diastereo-isomers have a similar stability.
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Reactions with nitroethane afforded mixtures of diastereoisomers, which is expected because the presence of an additional methyl group on the ring distorts the ideal all-trans relationship achieved for all substituents in compounds 7, indicating that several diastereo-isomers have a similar stability.
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To confirm this suggestion, samples of Michael adduct 5a (94% ee), which was isolated in the first step, were exposed to 40 mol% CsF. After 18 h we recovered the compound in 62% ee, demonstrating that the catalyst (CsF) initiated the retro-Michael reaction.
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To confirm this suggestion, samples of Michael adduct 5a (94% ee), which was isolated in the first step, were exposed to 40 mol% CsF. After 18 h we recovered the compound in 62% ee, demonstrating that the catalyst (CsF) initiated the retro-Michael reaction.
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