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Volumn 15, Issue 27, 2009, Pages 6576-6580

One-pot synthesis of pentasubstituted cyclohexanes by a Michael addition followed by a tandem inter-intra double Henry reaction

Author keywords

Carbocycles; Diarylprolinol ethers; Homogeneous catalysis; One pot reactions; Organocatalysis

Indexed keywords

CARBOCYCLES; DIARYLPROLINOL ETHERS; HOMOGENEOUS CATALYSIS; ONE-POT REACTIONS; ORGANOCATALYSIS;

EID: 67650305542     PISSN: 09476539     EISSN: 15213765     Source Type: Journal    
DOI: 10.1002/chem.200900894     Document Type: Article
Times cited : (56)

References (118)
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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
    • 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.
    • 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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    • 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.
    • 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.
    • 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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