ATH reductions of aliphaticketones in water catalyzed by ruthenium coordinated by prolinamide ligands produce alcohols with moderate enantiomeric excesses in most cases. A set of seven aliphaticketones is proposed for a rapid evaluation of the enantioselectivity of catalysts by one-pot multi-substrates reduction. The screening of a library of prolinamides shows that according to the structure of
A New Class of Amide Ligands Enable Cu-Catalyzed Coupling of Sodium Methanesulfinate with (Hetero)aryl Chlorides
作者:Dawei Ma、Songtao Niu、Jinlong Zhao、Xi Jiang、Yongwen Jiang、Xiaojing Zhang、Tiemin Sun
DOI:10.1002/cjoc.201700477
日期:2017.11
((2S,4R)‐4‐Hydroxy‐N‐(2‐methylnaphthalen‐1‐yl)pyrrolidine‐2‐carboxamide (HMNPC), an amidederivedfrom 4‐hydroxy‐L‐proline and 2‐methyl naphthalen‐1‐amine, is a powerful ligand for Cu‐catalyzed coupling of (hetero)aryl halides with sulfinic acidsalts, allowing for first time the metal‐catalyzed coupling of (hetero)aryl chlorides and NaSO2Me. A considerable number of (hetero)aryl chlorides worked well
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.
Design of Chiral Hydroxyalkyl‐ and Hydroxyarylazolinium Salts as New Chelating Diaminocarbene Ligand Precursors Devoted to Asymmetric Copper‐Catalyzed Conjugate Addition
The design and the synthesis of a set of new chiral hydroxyalkyl- and hydroxyaryl-chelating diaminocarbene ligands is reported. Comparative catalytic studies show the importance of the scaffold design around the NHC unit to obtain a high enantiocontrol in Cu-catalyzed asymmetricconjugateaddition (ACA). Whereas low selectivities are observed when the stereogenic centre is placed within the N-heterocyclic
Diastereoselective Hydrogenation of (S)-Proline-2-methylanilide
作者:Vidyadhar S. Ranade、Roel Prins
DOI:10.1006/jcat.1999.2525
日期:1999.7
The diastereoselectivehydrogenation of o-toluidine covalently linked to the chiral auxiliary (S)-proline has been studied. The hydrogenation of (S)-proline-2-methylanilide on supported noble metal catalysts yielded both the cis and the trans isomers of (S)-proline-2-methylcyclohexylamide. Rhodium and ruthenium were found to be the most active catalysts, rhodium being more selective than ruthenium