摘要:
Compounds of the formulae (I) and (Ia) where X1 is secondary phosphino; R3 is a hydrocarbon radical having from 1 to 20 C atoms, a heterohydrocarbon radical which has from 2 to 20 atoms and at least one heteroatorn selected from the group consisting of 0, S, NH and NR, or an -S02-R radical; R is C1-C18-alkyl, phenyl or benzyl; the radicals R4 are each, or the two radicals R4 together a hydrocarbon radical having from 1 to 20 C atoms; R01 is a hydrocarbon radical having from 1 to 20 C atoms; and R02 and R'o2 are each, independently of one another, a hydrogen atom or independently have the meaning of R01, or R01 and R02 together with the C atom to which they are bound form a three- to eight-membered hydrocarbon or hetero hydrocarbon ring. The compounds are chiral ligands for complexes of metals of transition groups I and VIll which act as catalysts for asymmetric additions, for example of hydrogen, onto prochiral unsaturated organic compounds.
摘要:
Ligands of the formula (I) secondary phosphine-Q-P(=O)HR 1 (I) in the form of mixtures of diastereomers or pure diastereomers, in which secondary phosphine is a secondary phosphine group with hydrocarbon radicals or heterohydrocarbon radicals as substituents; Q is a bivalent bisaryl or bisheteroaryl radical with an axial chiral centre to which the two phosphorus atoms are bonded in the ortho positions to the bisaryl or bisheteroaryl bridge bond, or Q is a bivalent ferrocenyl radical with a planar chiral centre or without a planar chiral centre, to which the phosphorus atom of the secondary phosphine is bonded directly or via a C 1 -C 4 -carbon chain to a cyclopentadienyl ring, the -P*(=O)HR 1 group is bonded either on the same cyclopentadienyl ring in ortho position to the bonded secondary phosphine or on the other cyclopentadienyl ring; P* is a chiral phosphorus atom, and R 1 is a hydrocarbon radical, a heterohydrocarbon radical or a ferrocenyl radical, where R 1 is a ferrocenyl radical with a planar chiral centre when Q is a ferrocenyl radical without a planar chiral centre. Metal complexes of these ligands are homogeneous catalysts for asymmetric addition reactions, particularly hydrogenations.
摘要:
The invention relates to compounds having a structural element of formula (I) in an aromatic hydrocarbon ring, wherein: M represents -Li, -MgX3, (C1-C18-Alkyl)3Sn-, -ZnX3 or -B(O-C1-C4-Alkyl)2; X1 and X2, independent of one another, represent O or N, and C-bound hydrocarbon radicals or heterohydrocarbon radicals are bound to the free bonds of the O and N atoms; group -C=C-, together with C atoms, forms a hydrocarbon aromatic compound and represents X3 Cl, Br or I. The inventive compounds are easily obtained by directly substituting the hydrogen in the ortho position to the P atom with metalation reagents. The metal atoms can then be substituted by a reactive electrophilic compound. The group -P(X1-)(X2-)----(BH3)0,1 can then be converted into a secondary phosphine group. The inventive method enables the production of monophosphines and diphosphines even on a large scale, which are valuable ligands for metal complexes serving as catalysts for, e.g. enantioselective hydrogenations.
摘要:
Verbindungen mit einem Strukturelement der Formel (I) in einem aromatischen Kohlenwasserstoffring, worin M für -Li, -MgX 3 , (C 1 -C 18 -Alkyl) 3 Sn-, -ZnX 3 oder -B(O-C 1 -C 4 -Alkyl) 2 steht, X 1 und X 2 unabhängig voneinander O oder N- bedeuten, und an die freien Bindungen der O- und N-Atome C-gebundene Kohlenwasserstoff- oder Heterokohlenwasserstoffreste gebunden sind, die Gruppe -C=C- zusammen mit C- Atomen einen Kohlenwasserstoffaromaten bildet, und X 3 Cl, Br oder I darstellt, werden in einfacher Weise durch direkte Substitution des Wasserstoffs in Orthostellung zum P-Atom mit Metallierungsreagenzien erhalten. Die Metallatome können dann durch reaktive elektrophile Verbindung substituiert werden. Die Gruppe -P(X 1 -)(X 2 -)----(BH 3 ) 0,1 kann dann in eine Sekundärphosphingruppe umgewandelt werden. Mit dem Verfahren können auch im grösseren Massstab Mono- und Diphosphine hergestellt werden, die wertvolle Liganden für Metallkomplexe als Katalysatoren für zum Beispiel enantioselektive Hydrierungen sind.
摘要:
Chiral compounds of the formula (1 ), which are optically pure or highly optically enriched in which R 0 is C 1 -C 12 -alkyl which is unsubstituted or substituted by 1 to 2 C 1 -C 4 -alkoxy; cyclo- pentyl or cyclohexyl, which is unsubstituted or substituted by 1 to 3 C 1 -C 4 -alkyl or C 1 -C 4 -alkoxy; or benzyl, phenyl or naphtyl which is unsubstituted or substituted by 1 to 3 C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy, C 1 -C 4 -fluoroalkyl or C 1 -C 4 -fluoroalkoxy, F or Cl, or R 0 is -C R 5 R 6 OH or -C R 5 R 6 OSi(C 1 -C 8 -alkyl) 3 wherein R 5 and R 6 are indedendently selected from the group consisting of H, unsubstituted C 1 - C 12 alkyl, substituted C 1 - C 12 alkyl, unsubstituted C 4 - C 8 cyclo alkyl, substituted C 4 - C 8 cyclo alkyl, unsubstituted aryl, substituted aryl or wherein R 5 and R 6 can form an unsubstituted 5-6 membered aliphatic carbocycle or a substituted 5-6 membered aliphatic carbocycle, each of R 1 and R' 1 independently is hydrogen or has the meaning of R 0 whereby R 1 , R' 1 and R 0 can be same or different, R 2 and R 3 are independently a C-bonded hydrocarbon radical or a heterohydrocarbon radical, and each of both R 4 is C 1 -C 6 -alkyl, cyclopentyl, cyclohexyl, phenyl, methylphenyl, methylbenzyl or benzyl, or both R 4 together form an aliphatic C 4 -C 6 carbocycle. Metal complexes of these ligands are homogeneous catalysts for asymmetric addition reaction, particularly hydrogenations.
摘要:
Provided is an enantioselective, palladium-catalyzed method for the preparation of γ-amino-α,β-unsaturated carboxylic acid derivatives having the formulas II, III, IV and VIII.
摘要:
Compounds of the formula (I), in the form of mixtures comprising predominantly one diastereomer or in the form of pure diastereomers, Z 1 -Q-P*R 0 R 1 (I) in which Z 1 is a C-bonded, secondary phosphine group -P(R) 2 ; in which R is in each case independently hydrocarbon radicals or heterohydrocarbon radicals, or Z 1 is the -P*R 0 R 1 group; Q is a bivalent, achiral, aromatic base skeleton, a bivalent, achiral ferrocene base skeleton, an optionally substituted bivalent cycloalkane or heterocycloalkane skeleton, or a C 1 -C 4 -alkylene skeleton, and in which base skeletons a secondary phosphine group Z 1 is bonded directly to a carbon atom, or, in the case of cyclic base skeletons, directly to a carbon atom or via a C 1 -C 4 -alkylene group, and in which base skeletons a P-chiral group -P*R 0 R 1 is bonded directly to a carbon atom, or, in the case of cyclic base skeletons, directly to a carbon atom or via a C 1 -C 4 -alkylene group to a carbon atom such that the phosphorus atoms are linked via 1 to 7 atoms of a carbon chain optionally interrupted by heteroatoms from the group of O, S, N, Fe or Si; P* is a chiral phosphorus atom; R 0 is methyl or hydroxyl, and R 0 is methyl when Z 1 is the -P*R 0 R 1 group; and R 1 is a C-bonded optically enriched or optically pure chiral, mono- or polycyclic, nonaromatic hydrocarbon or heterohydrocarbon radical which has 3 to 12 ring atoms and 1 to 4 rings and which has a stereogenic carbon atom at least in the α position to the P-C bond; Metal complexes of these ligands are homogeneous catalysts for asymmetric addition reactions, particularly hydrogenations.
摘要翻译:主要为一种非对映体或纯非对映体形式的混合物形式的式(I)化合物,其中Z 1为C键,仲膦基-P(R)的Z1-QP * R0R1(I) 2; 其中R各自独立地为烃基或杂烃基,或Z1为-P * R0R1基团; Q是二价,非手性,芳族碱基骨架,二价,非手性二茂铁碱骨架,任选取代的二价环烷烃或杂环烷骨架,或C1-C4-亚烷基骨架,其中,基骨架中的次膦基Z1直接键合 或在环状基团骨架的情况下直接与碳原子或C 1 -C 4 - 亚烷基直接键合,并且其中的基础骨架中,P手性基团-P * R0R1直接键合到碳上 或者在环状基骨架的情况下,直接连接到碳原子上,或者通过C1-C4-亚烷基与碳原子连接,使得磷原子通过1至7个任选被杂原子中断的碳链原子连接 由O,S,N,Fe或Si组成; P *是手性磷原子; R 0是甲基或羟基,当Z 1是-P * R 0 R 1基团时,R 0是甲基; 并且R 1是C-键合的光学富集或光学纯的手性,单或多环,非芳族烃或杂烃基,其具有3至12个环原子和1至4个环,并且其具有立体碳原子至少在 PC债券; 这些配体的金属络合物是用于不对称加成反应的均相催化剂,特别是氢化。
摘要:
The present invention relates in a first aspect to a process for hydrogenation of ketones having at least a carbon-carbon double bond in the y, 8 - position to the keto group by hydrogen in the presence of at least one chiral iridium complex of formula (I), where R1 represents a group of formula (II) or (III) or (IV). It has been shown that this process leads to a strong increase in preferential formation of a single isomer. The process is particu larly su itable for the hydrogenation of y, 8 - unsaturated ketones which can be used as flavours and fragrances or for the preparation of vitamin E and its derivatives or of flavours and fragrances.
摘要:
Compounds of the formula I, in the form of mixtures comprising predominantly one enantiomer or in the form of pure enantiomers, secondary phosphine-Q-P*(=O)HR 1 (I) in which secondary phosphine is a C-bonded, secondary phosphine group -P(R) 2 ; in which R is in each case independently hydrocarbon radicals or heterohydrocarbon radicals; Q is a bivalent, achiral, aromatic base skeleton, a bivalent, achiral ferrocene base skeleton, an optionally substituted bivalent cycloalkane or heterocycloalkane skeleton, or a C 1-C 4-alkylene skeleton, and in which base skeletons a secondary phosphine group is bonded directly to a carbon atom, or, in the case of cyclic base skeletons, directly to a carbon atom or via a C 1 -C 4 -alkylene group, and in which base skeletons a P-chiral group -P*(O)HR 1 is bonded to a carbon atom such that the phosphorus atoms are linked via 1 to 7 atoms of a carbon chain optionally interrupted by heteroatoms from the group of O, S, N, Fe or Si; P* is a chiral phosphorus atom; and R 1 is a hydrocarbon radical, a C-bonded heterohydrocarbon radical or a ferrocenyl radical, with the proviso that R 1 is an achiral ferrocenyl radical when Q is an achiral ferrocenyl base skeleton. Metal complexes of these ligands in a molarratio of ligand to metal of about 1.3:1 to 0.9:1are homogeneous catalysts for asymmetric addition reactions, particularly hydrogenations.
摘要:
The invention relates to the (stereoselective) hydrogenation of carbon-carbon double bonds in compounds having at least one such bond, e.g., isoprenoids, non-cyclic sesquiterpenes, tocomonoenols, tocodienols, tocotrienols or derivatives thereof, as well as to the (stereoselective) hydrogenation of parts/extracts of plant oils containing such tocotrienols or derivatives thereof, in the presence of a chiral Ir complex as the catalyst, whereby preferably one stereoisomer is manufactured in an excess.