AMINO-5-[4-(DIFLUOROMETHOXY)PHENYL]-5-PHENYLIMIDAZOLONE COMPOUNDS FOR THE INHIBITION OF BETA-SECRETASE
申请人:Malamas Michael Sotirios
公开号:US20090048320A1
公开(公告)日:2009-02-19
The present invention provides compounds and methods for the use thereof to inhibit β-secretase (BACE) and treat β-amyloid deposits and neurofibrillary tangles.
本发明提供了化合物和方法,用于抑制β-分泌酶(BACE)并治疗β-淀粉样沉积物和神经原纤维缠结。
CATALYST FOR ASYMMETRIC HYDROGENATION
申请人:MAEDA Hironori
公开号:US20100324338A1
公开(公告)日:2010-12-23
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.
Hydride reduction of alpha, beta-unsaturated carbonyl compounds using chiral organic catalysts
申请人:MacMillan David
公开号:US20060161024A1
公开(公告)日:2006-07-20
Nonmetallic, chiral organic catalysts are used to catalyze the 1,4-hydride reduction of an α,β-unsaturated carbonyl compound. The α,β-unsaturated carbonyl compound may be an aldehyde or cyclic ketone, and the hydride donor may be a dihydropyridine. The reaction is enantioselective, and proceeds with a variety of hydride donors, catalysts, and substrates. The invention also provides compositions effective in carrying out the 1,4-hydride addition of α,β-unsaturated carbonyl compounds.
Preparation and Structures of 2-Substituted 5-Benzyl-3-methylimidazolidin-4-one-Derived Iminium Salts, Reactive Intermediates in Organocatalytic Transformations Involving<i>α</i>,<i>β</i>-Unsaturated Aldehydes
Preparations of the title compounds, 5–7 (Scheme 1 and Table 1), of their ammonium salts, 9–11 (Scheme 2 and Table 2), and of the corresponding cinnamaldehyde‐derived iminiumsalts 12–14 (Scheme 3 and Table 3) are reported. The X‐ray crystal structures of 15 cinnamyliminium PF6 salts have been determined (Table 4). Selected 1H‐NMR data (Table 5) of the ammonium and iminiumsalts are discussed, and
Tandem Addition/Cyclization of Alkynylzinc Reagents to Enantiopure 2-tert-Butyl-3,5-dimethyl-2,3-dihydroimidazol-4-oneN-Oxide: Potential Precursors of Quaternary α-Amino Acids
作者:Frédéric Cantagrel、Sandra Pinet、Yves Gimbert、Pierre Y. Chavant