Excellent regiochemical control in the hydroformylation of .alpha.,.beta.-unsaturated esters catalyzed by zwitterionic rhodium complexes and 1,4-bis(diphenylphosphino)butane
Influence of 1,4-Bis(diphenylphosphino)butane on the Hydroformylation of .alpha.,.beta.-Unsaturated Esters Catalyzed by Zwitterionic, Cationic, and Neutral Rhodium(I) Complexes. The Asymmetric Hydroformylation of .alpha.-Methylene-.gamma.-Butyrolactone
作者:Chul Woo Lee、Howard Alper
DOI:10.1021/jo00108a007
日期:1995.2
An investigation was made of the effect of 1,4-bis(diphenylphosphino)butane (dppb) on the regioselectivity of the hydroformylation of alpha,beta>-unsaturated esters with synthesis gas, catalyzed by rhodium(I) complexes. Excellent regioselectivity was obtained when dppb was added as a ligand for the reaction of methyl acrylate and alpha-methylene-gamma-butyrolactone with synthesis gas. However, it inhibits the reaction when methyl methacrylate is used as the substrate. The asymmetric hydroformylation of alpha-methylene-gamma-butyrolactone using [Rh(1,5-hd)(phen)]Cl-+(-) as the catalyst and (R)-BINAP as the chiral ligand (6:1 ratio of(R)-BINAP/Rh) gave an aldehydic lactone, containing a quaternary chiral center, in up to 37% ee.
GRANDBERG I. I.; TOKMAKOV G. P., XIMIYA GETEROTSIKL. SOEDIN. <KGSS-AQ>, 1975, HO 2, 207-10
作者:GRANDBERG I. I.、 TOKMAKOV G. P.
DOI:——
日期:——
[EN] HYDROFORMYLATION PROCESS
申请人:UNIVERSITE D'OTTAWA/UNIVERSITY OF OTTAWA
公开号:WO1993014057A1
公开(公告)日:1993-07-22
(EN) A process for the production of an aldehyde from an olefin (e.g. a functionalised olefin) is provided. The process comprises reacting the olefin with carbon monoxide and hydrogen and/or a reducing agent in the liquid phase in the presence of a soluble catalyst comprising a Zwitterionic rhodium complex and a bidentate phosphine ligand. The process is suitably carried out on an elevated temperature in the range 70 to 120 °C.(FR) Un procédé pour la production d'un aldéhyde à partir d'une oléfine (par exemple une oléfine fonctionnalisée) est décrit. Le procédé comprend la réaction de l'oléfine avec le monoxyde de carbone et l'hydrogène et/ou un agent réducteur, en phase liquide, en présence d'un catalyseur soluble comprenant un complexe zwitterionique de rhodium et un ligand phosphine bidentate. Le procédé s'effectue de manière adéquate à une température élevée, de l'ordre de 70 à 120 °C.
[EN] INTERNALLY MASKED NEOPENTYL SULFONYL ESTER CYCLIZATION RELEASE PRODRUGS OF ACAMPROSATE, COMPOSITIONS THEREOF, AND METHODS OF USE<br/>[FR] PROMÉDICAMENTS DE L'ACAMPROSATE À LIBÉRATION PAR CYCLISATION DE NÉOPENTYLSULFONYLESTER À MASQUAGE INTERNE, LEURS COMPOSITIONS ET PROCÉDÉS D'UTILISATION
申请人:XENOPORT INC
公开号:WO2009052191A1
公开(公告)日:2009-04-23
Internally masked neopentyl sulfonyl ester prodrugs of acamprosate, pharmaceutical compositions comprising such prodrugs, and methods of using such prodrugs and compositions thereof for treating diseases are disclosed. In particular, acamprosate prodrugs exhibiting enhanced oral bioavailability and methods of using acamprosate prodrugs to treat neurodegenerative disorders, psychotic disorders, mood disorders, anxiety disorders, somatoform disorders, movement disorders, substance abuse disorders, binge eating disorder, cortical spreading depression related disorders, tinnitus, sleeping disorders, multiple sclerosis, and pain are disclosed.