摘要:
The invention relates to a method for producing addition products to the C=C double bond of ethylenic unsaturated compound in the presence of a catalyst, comprising at least one complex of a metal of the VIII sub-group with at least one bisphospholyl metallocene as ligand. The invention further relates to novel catalysts with phosphametallocenes as ligands.
摘要:
The present invention relates to a process for the preparation of acetyl-amidiniophenylalanyl-cyclohexylglycyl-pyridinioalaninamides of formula (I), in which the anions X are physiologically acceptable anions, and their analogs, which are effective inhibitors of the blood coagulation factor Xa and which can be used, for example, for preventing thromboses. The process according to the invention comprises the coupling of 2-[2-acetylamino-3-(4-amidinophenyl)propionylamino]-2-cyclohexylacetic acid, which is obtained from 2-[2-acetylamino-3-(4-cyanophenyl)-acryloylamino]-2-cyclohexylacetic acid by asymmetric hydrogenation and conversion of the cyano group into the amidine, or a salt thereof, with a 3-(2-amino-2-carbamoylethyl)-1-methylpyridinium salt or a salt thereof. The invention furthermore provides starting materials and intermediates for this process, processes for their preparation and acetyl-(S)-4-amidiniophenylalanyl-(S)-cyclohexylglycyl-(S)-(1-methyl-3-pyridinio)alaninamide as ditosylate salt.
摘要:
The invention concerns the use of chiral diphosphines as optically active ligands for preparing diphosphino-metal complexes. The invention also concerns diphosphino-metal complexes comprising a chiral diphosphine as ligands and asymmetrical catalysis methods using said complexes. More particularly, the invention concerns the use of said diphosphino-metal complexes in asymmetrical hydrogenation or isomerization processes for the synthesis of organic products with desired chirality.
摘要:
This invention relates to a process for separating one or more organophosphorus ligand degradation products, one or more reaction byproducts and one or more products from a continuously generated reaction product fluid comprising one or more unreacted reactants, a metal-organophosphorus ligand complex catalyst, optionally free organophosphorus ligand, said one or more organophosphorus ligand degradation products, said one or more reaction byproducts, said one or more products, one or more nonpolar solvents and one or more polar solvents by phase separation wherein (i) the selectivity of the nonpolar phase for the organophosphorus ligand with respect to the one or more products is expressed by a partition coefficient ratio Ef1 which is a value greater than about 2.5, (ii) the selectivity of the nonpolar phase for the organophosphorus ligand with respect to the one or more organosphosphorus ligand degradation products is expressed by a partition coefficient ratio Ef2 which is a value greater than about 2.5, and (iii) the selectivity of the nonpolar phase for the organophosphorus ligand with respect to the one or more reaction byproducts is expressed by a partition coefficient ratio Ef3 which is a value greater than about 2.5.
摘要:
A process for the trimerisation of olefins is disclosed, comprising contacting a monomeric olefin or mixture of olefins under trimerisation conditions with a catalyst which comprises (a) a source of chromium, molybdenum or tungsten (b) a ligand containing at least one phosphorus, arsenic or antimony atom bound to at least one hydrocarbyl or heterohydrocarbyl group having a polar substituent, but excluding the case where all such polar substituents are phosphane, arsane or stibana groups; and optionally (c) an activator.
摘要:
Compounds of formula (I), wherein R1 and R2 are, independently of one another, H, C1-C6alkyl, C1-C6halogenalkyl, C1-C6alkoxy, C1-C6alkoxy-C1-C6alkyl, or C1-C6alkoxy-C1-C6alkyloxy, and R3 is C1-C6alkyl, are obtainable in high yields by stereoselective addition of R3-substituted propionic acid esters to R1- and R2-substituted benzaldehydes of formula R-CHO to form corresponding 3-R-3-hydroxy-2-R3-propionic acid esters, conversion of the OH group to a leavaing group, subsequent regioselective elimination to form 3-R-2-R3-propenic acid esters, and their hydrolysis to form corresponding propenic carboxylic acids and their enantioselective hydrogenation, wherein R is (a).
摘要:
A novel phosphine ligand is an enantiomerically enriched compound of formula (5) or the opposite enantiomer thereof, wherein Ar and Ar represent the same or different aromatic groups of up to 20 C atoms. A transition metal complex of this ligand is useful as a catalyst in stereoselective hydrogenation.
摘要:
Bidentate ligand of formula (II) R R M -R-M R R , wherein M and M are independently P, As or Sb; R , R , R and R independently represent tertiary alkyl groups, or R and R together and/or R and R together represent an optionally substituted bivalent cycloaliphatic group whereby the two free valencies are linked to M or M , and R represents a bivalent aliphatic bridging group containing from 2 to 6 atoms in the bridge, which is substituted with two or more substituents. A catalyst system comprising: a) a source of group VIII metal cations, b) a source of such a bidentate ligand, and c) a source of anions. Use of such a catalyst system in a process for the carbonylation of optionally substituted ethylenically or acetylenically unsaturated compounds by reaction with carbon monoxide and a coreactant.
摘要翻译:式(II)的二齿配体R 1 R 2 M 1 -R M 2 R 3,其中M 1和M 2独立地是P,As或Sb ; R 1,R 2,R 3和R 4独立地表示叔烷基,或者R 1和R 2一起和/或R 3和R 4一起代表 任选取代的二价脂环族基团,其中两个自由价与M 1或M 2连接,R表示桥中含有2至6个原子的二价脂族桥基,其被两个或多个取代基取代 。 一种催化剂体系,其包括:a)第VIII族金属阳离子源,b)这种二齿配体的源,和c)阴离子源。 在通过与一氧化碳和共反应物反应的羰基化任选取代的烯属或炔属不饱和化合物的方法中使用这种催化剂体系。
摘要:
Functionalized allylic olefins are condensed by metathesis using the catalyst 1,3-dimesityl-4,5-dihydroimidazol-2-ylidene ruthenium benzylidene [Ru*] (1).
摘要:
Chiral ligands and transition metal complexes based on such chiral ligands useful in asymmetric catalysis are disclosed. The chiral ligands include (R,S,S,R)-DIOP*. The ruthenium complex reduces enamide to the corresponding amine with up to 99% enantioselectivity. The transition metal complexes of the chiral ligands are useful in asymmetric reactions such as asymmetric hydrogenation, hydride transfer, hydrosilylation, hydroboration, hydrovinylation, hydroformylation, hydrocarboxylation, isomerization, allylic alkylation, cyclopropanation, Diels-Alder reaction, Heck reaction, isomerization, Aldol reaction, Michael addition and epoxidation reactions.