New Synthesis of 2-Alkyl-4,4-dimethyl-5-halomethylisoxazolidin-3-ones via Intramolecular Halocyclization of N-Alkyl-2,2-dimethyl-3-butenohydroxamic Acids
New Synthesis of 2-Alkyl-4,4-dimethyl-5-halomethylisoxazolidin-3-ones via Intramolecular Halocyclization of N-Alkyl-2,2-dimethyl-3-butenohydroxamic Acids
Syntheses of Aldol Products and Cyanohydrins from Carboxylic Acids Using Hydrosilanes, Organosilicon Reagents, and Indium Triiodide Catalyst
作者:Yoshihiro Inamoto、Yoshihiro Nishimoto、Makoto Yasuda、Akio Baba
DOI:10.1246/cl.130790
日期:2013.12.5
Carboxylic acids were applied to an indium triiodide-catalyzed reductive aldol reaction and a reductive cyanation in order to produce aldol adducts and cyanohydrins, respectively, in which the separate addition of two kinds of hydrosilanes was crucial in combination with either ketene silyl acetals or silyl cyanides.
Face off: The rutheniumcomplexes of a new axially chiral PNN ligand (L) are highly efficient in the presence of dimethylsulfoxide (DMSO) for hydrogenation of both functionalized and unfunctionalized tert‐alkyl ketones. DMSO is thought to narrow down the many possible complex stereoisomers into a single facial L/Ru complex, thus enhancing the reactivity, selectivity, and productivity.
Compounds Which Selectively Modulate The CB2 Receptor
申请人:BARTOLOZZI Alessandra
公开号:US20100076029A1
公开(公告)日:2010-03-25
Compounds of formula (I)
are disclosed. Compounds according to the invention bind to and are agonists, antagonists or inverse agonists of the CB2 receptor, and are useful for treating inflammation. Those compounds which are agonists are additionally useful for treating pain.
Mesoporous silica anchored Ru catalysts for highly enantioselective hydrogenation of β-ketoesters
作者:Banu Kesanli、Wenbin Lin
DOI:10.1039/b406697a
日期:——
Recyclable and reusable mesoporous silica anchored Ru catalysts based on 4,4â²-substituted BINAPs were synthesized and used for the hydrogenation of β-alkyl β-ketoesters with up to 98.6% e.e. and β-aryl β-ketoesters with up to 95.2% e.e.
Chiral porous metal phosphonates for heterogeneous asymmetric catalysis
申请人:——
公开号:US20040192543A1
公开(公告)日:2004-09-30
Chiral porous zirconium phosphonates containing metal complex moieties are provided, synthesized via a molecular building block approach, and characterized by a variety of techniques including TGA, adsorption isotherms, XRD, SEM, IR, and microanalysis. These hybrid solids may be used for enantioselective heterogeneous asymmetric hydrogenation of aromatic ketones with remarkably high e.e. values of up to 99.2%. Similarly prepared chiral porous solids may be used for asymmetric hydrogenation of &bgr;-keto esters with e.e.'s of up to 95%. The solid catalysts can also be easily recycled and reused multiple times without the loss of activity and enantioselectivity. Ready tunability of such a molecular building block approach allows the optimization of these hybrid materials to provide practically useful heterogeneous asymmetric catalysts.