摘要:
A non-symmetrical diphosphine of the formula R1R2P—(Z)—PR3R4 wherein Z represents a chain of 2 to 4 carbon atoms which may be substituted, which chain may be saturated or unsaturated, and R1, R2, R3 and R4, which may be the same or differ, are aliphatic, aromatic or heteroaromatic groups attached to the phosphorus by carbon, nitrogen, oxygen or sulphur such that each phosphorus atom and its substituents independently form a single enantiomer.
摘要翻译:式R 1 R 2 - (Z)-PR 3 R 4的不对称二膦其中Z表示可被取代的2至4个碳原子的链,该链可以是 饱和或不饱和的,R 1,R 2,R 3和R 4可以相同或不同,是通过碳,氮,氧连接到磷上的脂族,芳族或杂芳族基团 或硫,使得每个磷原子及其取代基独立地形成单一的对映异构体。
摘要:
Bicyclic amino alcohols, whose amino group and hydroxy group are bonded in positions 1,3 adjacent to the bridge, for example are valuable ligands for metal complexes of the d-8 metals of the periodic table of elements. The metal complexes in question are catalysts or catalyst precursors for the asymmetric hydrogenation or asymmetric transfer hydrogenation with hydrogen donors of prochiral organic compounds with carbon double bonds or carbon/hetero atom double bonds, for example ketones and imines.
摘要:
The present invention provides a novel bisphosphine compound having a chiral center on the phosphorus atom, which is suitable as a ligand for an asymmetric catalyst for use in asymmetric hydrogenation, this bisphosphine compound being represented by the following formula (1): (where t—C8H17 denotes 1,1,3,3-tetramethylbutyl), and a process for the production of this bisphosphine compound. Also provided are a transition metal complex having this bisphosphine compound as a ligand, and a process for the asymmetric hydrogenation of an unsubstituted carboxylic acid or its ester.
摘要:
A phosphine compound of formula (1) 1 and a phosphine compound of formula (2) 2 a transition metal complex having the phosphine compound as a ligand and a catalyst for asymmetric hydrogenation including the transition metal complex.
摘要:
A novel phosphine compound having excellent properties (chemical selectivity, enantioselectivity, catalytic activity) as a catalyst for asymmetric syntheses, especially asymmetric hydrogenation. A phosphine-phosphorane compound represented by the following general formula: 1 (wherein R1 represents hydrogen atom or a linear or branched alkyl group having 1 to 4 carbon atoms, R2, R3, R4, and R5 are the same or different, and each represents hydrogen atom, or an alkyl group having 1 to 6 carbon atoms, etc., and each of R2 and R3, R3 and R4, and R4 and R5 may be together combined to form a ring which may contain one or more (preferably 1 to 2) oxygen atoms, and R6 and R7 are the same or different, and each represents a linear or branched alkyl group having 1 to 6 carbon atoms, etc.).
摘要:
Compounds of formula III, wherein R6 und R7 signify identical or different secondary phosphino; R8 is —CH2—OH, —CH2—NH2, —CH2—O—B—FU, —CH2—NH2—B—FU, or —O—B—FU; R9 has the same significance as R8 or is C1-C4-alkyl or C1-C4-alkoxy; or R8 and R9 together signify HOCH(CH2—O—)2, H2NCH—(CH2—O—)2, FU—B—OCH(CH2—O—)2 or FU-B-HNCH(CH2—O—)2; B is a bridging group; and FU is a functional group. The compounds may be bonded to inorganic or organic carriers. Their d-8 metal complexes are valuable catalysts for the enantioselective hydrogenation of prochiral organic compounds with carbon multiple bonds or carbon/hetero atom multiple bonds.
摘要:
P-chiral bisphospholane ligands and methods for their preparation are described. Use of metal/P-chiral bisphospholane complexes to catalyze asymmetric transformation reactions to provide high enantiomeric excesses of formed compounds is also described.
摘要:
The invention provides a metal complex comprising a ligand and a metal. The ligand is an aminophosphine compound represented by the following formula (1) The metal is rhodium, ruthenium, iridium or nickel.
摘要:
This invention is to develop novel transition metal catalysts for the practical synthesis of important chiral molecules. The invention emphasizes asymmetric catalysis based on chiral bidentate phosphine ligands with cyclic ring structures which could be used to restrict conformational flexibility of the ligands and thus the efficiency of chiral transfer can be enhanced through the ligand rigidity.
摘要:
The invention includes selected novel optically active null-amino ketones which either are themselves useful or are intermediates for the preparation of known ketomethylene pseudopeptides useful as antibiotics, antibiotic enhancers, or enzyme inhibitors. Further, the present invention provides a method for dehydrogenation/asymmetrical hydrogenation to obtain essentially pure antipodes of ketomethylene pseudopeptides having two chiral centers.