摘要:
The present invention is directed at a process for preparing enantiomerically enriched compounds of the general formula (I). Compounds of the type shown are employed in catalyst systems.
摘要:
In the present application protection is sought for compounds of the general formula (I) as ligands for reactions catalysed by transition metals. The preparation thereof and use thereof, in particular for the preparation of β-amino acids, is also discussed.
摘要:
The present invention is directed to a process for preparing compounds of the general formula (I). Compounds of the general formula (I) are advantageous precursors for preparing phospholane catalysts, especially bisphospholane catalysts. The invention therefore likewise provides for the use of the substances in question for preparing these catalysts.
摘要:
This application claims the benefit of German priority Application No. 10138140.9, filed on Aug. 9, 2001, and International Application No. PCT/EP02/08748, filed on Aug. 6, 2002. The invention relates to the production of amines by the reaction of aldehydes or ketones with ammonia or primary or secondary amines in the presence of a hydrogen-donor and the presence of homogeneous metal catalysts of the eighth sub-group under mild conditions.
摘要:
The present invention relates to a method for the preparation of H8-1,1′-bi-2-naphthyl derivatives of the formula (II) by reduction of the corresponding binaphthyl derivatives by hydrogen in the presence of a catalyst containing at least one metal selected from the group Pt, Ir, Os, Pd, Rh, Ru, Ni, Co and Fe applied to a solid support.
摘要:
Phospholanes and diphospholanes of the formula I ##STR1## where: R.sup.1 and R.sup.2 are, independently of one another, C.sub.1 -C.sub.6 -alkyl, aryl, alkylaryl,R.sup.1 is also hydrogen,A is either R.sup.1 or ##STR2## B is a linker having 1-5 carbon atoms between the two phosphorus atoms, and their use as catalyst in asymmetric synthesis.
摘要:
(EN) The invention relates to the use of novel organophosphoric compounds and metal complexes thereof in catalytic reactions, and to the hydroformylation of olefins in the presence of these compounds.
摘要:
According to the invention, a process for the preparation of a statin is provided, comprising the following steps: a) preparation of a compound of the formula II in which S1 denotes a hydrogen atom or a hydroxylprotective group, S2 and S3, independently of one another, denote hydroxylprotective groups and R1 represents a hydrogen atom or a carboxylprotective group, by stereoselective hydrogenation of a compound of the formula III to give a compound of the formula II-a and optionally introduction of a hydroxylprotective group and b) lactonization of the compound of the formula II to give a compound of the formula I-a
摘要翻译:根据本发明,提供了一种制备他汀类药物的方法,包括以下步骤:a)制备式II化合物,其中S 1至O 1表示氢原子或羟基保护基团 S 2和S 3彼此独立地表示羟基保护基,R 1表示氢原子或羧基保护基,通过立体选择性 氢化式III化合物,得到式II-a的化合物和任选地引入羟基保护基团,和b)式II化合物的内酯化,得到式Ia化合物