Journal
JOURNAL OF THE IRANIAN CHEMICAL SOCIETY
Volume 19, Issue 8, Pages 3407-3416Publisher
SPRINGER
DOI: 10.1007/s13738-022-02535-6
Keywords
Aldol reaction; Organocatalyst; Tetrahydropapaverine; Asymmetric catalysis; Natural product; Prolinamide
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Funding
- Shahid Beheshti University Research Council
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The synthesis of prolinamide derivatives of (R)-tetrahydropapaverine and their application as organocatalysts in asymmetric Aldol reaction were reported. Catalyst 2 showed the best catalytic activity in the reaction between cyclohexanone and 4-nitrobenzaldehyde, achieving up to 90% enantiomeric excess. Unlike the anti-stereoselectivity observed in the presence of L-proline alone, the hybridization with (R)-tetrahydropapaverine resulted in the formation of syn products as the major compounds.
Synthesis of prolinamide derivatives of (R)-tetrahydropapaverine as mono-, di- and tripeptide is reported. (R)-Tetrahydropapaverine-prolinamide hybrid derivatives were tested as organocatalysts in the asymmetric Aldol reaction of aldehydes and ketones within various solvents, temperatures, and molar ratios. Catalyst 2 (30 mol %) afforded the best result in the Aldol reaction of cyclohexanone with 4-nitrobenzaldehyde up to 90% ee. Although in the sole presence of L-proline the reaction proceeded with anti-stereoselectivity, its hybridization with (R)-tetrahydropapaverine yielded the formation of syn products as the major compounds. [GRAPHICS] .
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