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.
This invention aims at providing a catalyst for producing an optically active aldehyde or an optically active ketone, which is an optically active carbonyl compound, by carrying out selective asymmetric hydrogenation of an α,β-unsaturated carbonyl compound, particularly a catalyst which is insoluble in a reaction mixture for obtaining optically active citronellal which is useful as a flavor or fragrance, by carrying out selective asymmetric hydrogenation of citral, geranial or neral; and a method for producing a corresponding optically active carbonyl compound. 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 at least one metal selected from metals belonging to Group 8 to Group 10 of the Periodic Table is supported on a support, an optically active cyclic nitrogen-containing compound and an acid.
Organocatalytic Enantioselective Cycloaddition Reactions of Dienamines with Quinones
作者:Tore Kiilerich Johansen、Clarisa Villegas Gómez、Jesper R. Bak、Rebecca L. Davis、Karl Anker Jørgensen
DOI:10.1002/chem.201303526
日期:2013.12.2
Matching catalyst and substrate: Organocatalyticcycloaddition between dienamines and 1,4‐benzo‐ or 1,4‐naphthoquinones affords biologically interesting dihydronaphtho‐ and dihydroanthraquinone core structures. The enantioselectivity of this new reaction is ensured by a steric shielding catalyst and carefully selecting substrates that greatly favor the endo approach (see scheme) due to electrostatic
Diastereoselective synthesis of chiral 1,3-cyclohexadienals
作者:Aitor Urosa、Ignacio E. Tobal、Ángela P. de la Granja、M. Carmen Capitán、R. F. Moro、Isidro S. Marcos、Narciso M. Garrido、Francisca Sanz、Emilio Calle、David Díez
DOI:10.1371/journal.pone.0192113
日期:——
with a chiral α,β-unsaturated aldehyde in the presence of a Jørgensen-Hayashi organocatalyst provides easy and stereocontrolled access to the cyclohexadienal backbone. This method allows for the synthesis of potential photoprotective chiral 1,3-cyclohexadienals and extra extended conjugation compounds in a simple manner.
The first organocatalytic, ortho-regioselective inverse-electron-demand hetero-Diels–Alder reaction
作者:Joanna Hejmanowska、Marcin Jasiński、Jakub Wojciechowski、Grzegorz Mlostoń、Łukasz Albrecht
DOI:10.1039/c7cc06518c
日期:——
inverse-electron-demand hetero-Diels-Alder (IEDHDA) reaction is described. It has been demonstrated that by proper choice of reactants and reaction conditions the inverse-electron-demand hetero-Diels-Alder cycloaddition can be realized with unprecedented regioselectivity arising from the reaction between the terminal carbon atom of the dienophile and the heteroatom of the heterodiene.