A novelbifunctional organocatalyst library combining both aminocatalysis and phosphonicacid activation was used for the first time as an efficient tool for the stereoselectiveMichaeladdition of aldehydes with several aromatic nitroalkenes with good selectivities up to 95:5 dr and 93:7 er. Due to their high water solubility, the catalysts were easilyrecyclable and could be reused over several cycles
CATALYST FOR ASYMMETRIC HYDROGENATION AND METHOD FOR MANUFACTURING OPTICALLY ACTIVE CARBONYL COMPOUND USING THE SAME
申请人:YAMADA Shinya
公开号:US20120136176A1
公开(公告)日:2012-05-31
The present invention provides a catalyst used for manufacturing an optically active carbonyl compound by selective asymmetric hydrogenation of an α,β-unsaturated carbonyl compound, which is insoluble in a reaction mixture, and a method for manufacturing the corresponding optically active carbonyl compound. Particularly, the invention provides a catalyst for obtaining an optically active citronellal useful as a flavor or fragrance, by selective asymmetric hydrogenation of citral, geranial or neral. The invention relates to a catalyst for asymmetric hydrogenation of an α,β-unsaturated carbonyl compound, which comprises: a powder of at least one metal selected from metals belonging to Group 8 to Group 10 of the Periodic Table, or a metal-supported substance in which the at least one metal is supported on a support; an optically active peptide compound; and an acid, and also relates to a method for manufacturing an optically active carbonyl compound using the same.
Bifunctional peptide-thiourea organocatalysts enantioselectively catalyzeMannichreaction between tosyl-protected glyoxylate imine and pyruvate esters. N-terminal proline moiety is responsible for the stereoinduction of this reaction. DFT calculations, NMR spectroscopy, and mass spectrometry confirm bifunctional nature of the catalyst and simultaneous activation of both substrates.
Asymmetric Michael addition reactions of aldehydes to β-nitrostyrenes catalyzed by (S)–N-(D-prolyl-L-prolyl)-1 -triflicamido-3 -phenylpropan-2-amine
作者:Amol B. Gorde、Anas Ansari、Ramesh Ramapanicker
DOI:10.1016/j.tet.2021.132095
日期:2021.5
pan-2-amine, a catalyst previously reported by us for the asymmetric Michael addition of aldehydes to β-nitrostyrenes, 4 new molecules were designed and synthesized by increasing the distance between the triflicamide group and the secondary amino group in the catalyst. Under the optimized reaction conditions (S)–N-(D-prolyl-L-prolyl)-1-triflicamido-3-phenylpropan-2-amine exhibited high and improved
Catalyst for asymmetric hydrogenation and method for manufacturing optically active carbonyl compound using the same
申请人:Yamada Shinya
公开号:US08674144B2
公开(公告)日:2014-03-18
The present invention provides a catalyst used for manufacturing an optically active carbonyl compound by selective asymmetric hydrogenation of an α,β-unsaturated carbonyl compound, which is insoluble in a reaction mixture, and a method for manufacturing the corresponding optically active carbonyl compound. Particularly, the invention provides a catalyst for obtaining an optically active citronellal useful as a flavor or fragrance, by selective asymmetric hydrogenation of citral, geranial or neral. The invention relates to a catalyst for asymmetric hydrogenation of an α,β-unsaturated carbonyl compound, which comprises: a powder of at least one metal selected from metals belonging to Group 8 to Group 10 of the Periodic Table, or a metal-supported substance in which the at least one metal is supported on a support; an optically active peptide compound; and an acid, and also relates to a method for manufacturing an optically active carbonyl compound using the same.