Abstract:
The present invention relates to the manufacture of the compounds of formula (I) said compounds of formula (I) being valuable intermediates in the manufacture of Dolastatin 10 analogues, which are useful in the treatment of cancer.
Abstract:
The present invention relates to the manufacture of the compounds of formula (I) said compounds of formula (I), or their lithium salts, being valuable intermediates in the manufacture of Dolastatin analogues, which are useful in the treatment of cancer.
Abstract:
The invention relates to a process for the preparation of pyrido[2, 1-a] isoquinoline derivatives of the formula (I), weherein R 2 , R 3 and R 4 are as defined in the specification, comprising the steps of: a) catalytic asymmetric hydrogenation of an enamine of the formula (II), wherein R 1 is lower alkyl, in the presence of a transition metal catalyst containing a chiral diphosphane ligand, b) introduction of an amino protecting group Prot and c) amidation of the ester to form an amide of formula (V), wherein R 2 , R 3 , R 4 and Prot are as defined in the specification.
Abstract:
The present invention relates to the enzymatic manufacture of the compounds of formula (I) said compounds of formula (I) being valuable intermediates in the manufacture of Dolastatin 10 analogues, which are useful in the treatment of cancer.
Abstract:
This invention relates to a process of the preparation of the novel intermediate (S)-4-fluoromethyl-dihydro-furan-2-one of the formula (I) and with its use for the manufacture of pyrido[2,1-a] isoquinoline derivatives of the formula (II) which are useful for the treatment and / or prophylaxis of diseases which are associated with DPP IV.
Abstract:
The invention is concerned with new phosphine ligands of formula I wherein R 1 and R 2 are independently of each other alkyl, aryl, cycloalkyl or heteroaryl, said alkyl, aryl, cycloalkyl or heteroaryl may be substituted by alkyl, alkoxy, halogen, hydroxy, amino, mono- or dialkylamino, aryl, -S0 2 -R 7 , -S0 3 ¯ , -CO-NR 8 BR 8 ", carboxy, alkoxycarbonyl, trialkylsilyl, diarylalkylsilyl, dialkylarylsilyl or triarylsilyl; R 3 is alkyl, cycloalkyl, aryl or heteroaryl; R 4 ' and R 4 signify independently of each other hydrogen, alkyl or optionally substituted aryl; or R 4`’ and R 4 together with the C-atom they are attached to form a 3-8-membered carbocyclic ring; dotted line is absent or is present and forms a double bond; R 5 and R 6 are independently of each other hydrogen, alkyl or aryl, R 7 is alkyl or aryl; and R 8 and R 8' are independently of each other hydrogen, alkyl or aryl; the substituents attached by the bold bondsare in cis relation to each other; metal complexes with such ligands as well as the use of such metal complexes as catalysts in asymmetric reactions.
Abstract translation:本发明涉及式I的新膦配体,其中R 1和R 2彼此独立地为烷基,芳基,环烷基或杂芳基,所述烷基,芳基,环烷基或杂芳基可以被烷基,烷氧基, 卤素,羟基,氨基,一或二烷基氨基,芳基,-SO 2 -R 7,-SO 3,-CO-NR 8 BR 8,羧基,烷氧基羰基,三烷基甲硅烷基,二芳基烷基甲硅烷基,二烷基芳基甲硅烷基或三芳基甲硅烷基; R 3是烷基,环烷基,芳基或杂芳基; R 4和R 4彼此独立地表示氢,烷基或任选取代的芳基;或R 4'和R 4连同 它们连接的C原子形成3-8元碳环;虚线不存在或存在并形成双键; R 5和R 6彼此独立地为氢,烷基或芳基 R 7是烷基或芳基; R 8和R 8'彼此独立地是氢,烷基或芳基;通过大胆键连接的取代基彼此成顺序关系;金属络合物 h这样的配体以及在不对称反应中使用这样的金属络合物作为催化剂。
Abstract:
Bei einem Getriebe zum Übertragen einer Antriebsbewegung von einer Antriebsseite auf eine Abtriebsseite und zum Schalten zwischen einer ersten Übersetzung und einer zweiten Übersetzung, umfassend wenigstens drei Getrieberäder (22, 26, 28, 30), wobei die Antriebsbewegung an vordefinierten Kraftübertragungsstellen erster oder zweiter Übersetzung an Umfangen zweier miteinander in Eingriff stehender Getrieberäder übertragen wird, ist vorgesehen, dass zum Schalten von der ersten Übersetzung auf die zweite Übersetzung ein Umfangsabschnitt (Z2 2) eines Getrieberads (28) erster Übersetzung, der der Kraftübertragungsstelle erster Übersetzung nachläuft, in Axialrichtung aus einer durch die Kraftübertragungsstelle erster Übersetzung definierten Ebene, insbesondere Radialebene, herausfährt und ein Umfangsabschnitt (Z4 2) eines Getrieberads zweiter Übersetzung, der der Kraftübertragungsstelle zweiter Übersetzung vorläuft, in Axialrichtung in eine durch die Kraftübertragungsstelle zweiter Übersetzung definierte Ebene hineinfährt.
Abstract:
A process for the manufacture of 3-phytyl-2,5,6-trimethylhydroquinone-l-acetate, and optionally therefrom tocopheryl acetate, comprises either C-alkylating 2,3,6-trimethylhydroquinone-l-acetate with isophytol or phytol in the presence of a sulphur(VI) containing catalyst of the formulaR 1 SO 2 OH, wherein R l signifies hydroxy, halogen, lower alkyl, halogenated lower alkyl or aryl, in an aprotic organic solvent, or O-alkylating 2,3,6-trimethylhydroquinone-l-acetate with a phytyl halide in a polar aprotic organic solvent in the presence of a base, and subjecting the so-obtained 4-O-phytyl-2,3,6-trimethylhydroquinone-l-acetate to a rearrangement reaction, and in each case optionally submitting the so-obtained 3-phytyl-2,5,6-trimethylhydroquinone-l-acetate to a ring closure reaction to produce tocopheryl acetate. The invention also includes the novel compound 3-phytyl-2,5,6-trimethylhydroquinone-l-acetate and certain stereoisomers thereof, and also the further novel compound 4-hydroxy-2,3,6-trimethyl-5-[3-(4,8,12-trimethyltridecyl)-but-3enyl]phenyl acetate which itself is one of several isomers of 3-phytyl-2,5,6- trimethylhydroquinone-l-acetate formed by isomerization under the influence of heating, e.g. during its distillation as part of the isolation and purification procedure following its manufacture as indicated above. (All-rac)-α -tocopherol, which may be derived from its acetate, is known to be the most active industrially important member of the vitamin E group.
Abstract:
A dental irradiation device comprises a first light emitting unit for emitting blue light adapted for light hardening of a dental material. The device further comprises a second light emitting unit and an image sensing unit which are adapted for cooperation with each other for simultaneous illumination and image capturing. The device facilitates hardening of dental materials and provides, inter alia, additional diagnostic functions.
Abstract:
Ein Schieber (4) eines Magazins mit Aufnahmen für Pipetten (1) zum Bestücken von Substraten mit elektrischen Bauelementen ist oberhalb der Pipetten (1) mit dünnen Abdecksegmenten (9) versehen, die in einer Speicherstellung des Schiebers (4) obere Öffnungen der Pipetten (1) überdecken. In einer Wechselstellung des Schiebers (4) sind die Abdecksegmente (9) so weit verschoben, dass sie die Aufnahmen (3) vollständig freigeben. Dadurch wird mit geringem Verschiebeaufwand eine sichere Abdeckung der schmutzempfindlichen Bereiche der Pipetten (1) erreicht.