摘要:
The present invention relates to a method for the preparation of 3-substituted-3’-hydroxypropionitrile, more particularly, to a method for the preparation of 3-substituted-3’-hydroxypropionitrile which comprises performing ring opening of 1-substituted-ethylene oxide using sodium cyanide and citric acid in a range of pH 7.8 ~ 8.3 to provide 3-substituted-3’-hydroxypropionitrile in high optical purity and with high yield.
摘要:
Verfahren zur Abtrennung einer Verbindung, die mindestens zwei funktionelle Gruppen, unabhängig voneinander ausgewählt aus der Gruppe bestehend aus Nitrilgruppe, Carbonsäuregruppe, Carbonsäureestergruppe, Carbonsäureamidgruppe, trägt aus einer Mischung die eine Verbindung, die mindestens zwei funktionelle Gruppen, unabhängig voneinander ausgewählt aus der Gruppe bestehend aus Nitrilgruppe, Carbonsäuregruppe, Carbonsäureestergruppe, Carbonsäureamidgruppe, trägt, und eine bezüglich der Mischung homogene, Rhodium enthaltende Verbindung enthält, durch Destillation.
摘要:
The invention describes a method for the preparation of substituted 5,6-dihydropyrido[2,3-d]pyrimidin-7(8H)-one compounds of general formula (3) that can be used as selective kinase protein inhibitors, which comprises condensing an a,ß-unsaturated ester of general formula (4) with a propionitrile of general formula (5) in the presence of a specific base and reacting the resulting intermediate with a guanidine compound of general formula (6) or a salt thereof in the presence of another base. The invention also describes novel synthesis intermediates of general formula (1) and of general formula (2).
摘要:
Compounds of formula I wherein X is O or S(=O) n ; n is 0,1 or 2; R 1 is optionally substituted alkyl, haloalkyl, alkenyl, haloalkenyl, alkynyl, haloalkynyl, cycloalkyl, halocycloalkyl, cycloalkenyl, halocycloalkenyl, phenyl, hetaryl, phenylalkyl, hetaryl alkyl, optionally fused to phenyl, hetaryl or heterocyclyl; A is -NR b 2 , -C(=G)GR b , -C(=G)NR b 2 , -C(=NOR b )R b , C(=G)[N=SR b 2 ], -C(=G)NRb-NR b 2 , C 2 -C 6 -alkandiyl, C 2 -C 6 -alkenediyl, C 1 -C 3 -alkyl-G-C 1 -C 3 -alkyl, wherein R b is as defined in the description, or optionally substituted phenyl, hetaryl, heterocyclyl, optionally fused to phenyl or heterocyclyl; B is an optionally substituted saturated or partially unsaturated hydrocarbon chain with 1 to 3 carbon chain atoms; D is an optionally substituted saturated or partially unsaturated hydrocarbon chain with 1 to 5 carbon chain atoms or C 3 -C 6 -cycloalkyl; G is oxygen or sulfur; or the enantiomers or diastereomers or salts or N-oxides thereof, processes for preparing the compounds I, pesticidal compositions and synergistic mixtures comprising compounds I, methods for the control of insects, acarids or nematodes by contacting the pests or their food supply, habitat or breeding grounds with a pesticidally effective amount of compounds formula I, and a method for treating, controlling, preventing or protecting animals against infestation or infection by parasites which comprises orally, topically or parenterally administering or applying to the animals a parasiticidally effective amount of compounds of formula I.
摘要翻译:式I的化合物,其中X是O或S(= O)n N; n为0,1或2; R 1是任选被取代的烷基,卤代烷基,烯基,卤代烯基,炔基,卤代炔基,环烷基,卤代环烷基,环烯基,卤代环烯基,苯基,杂芳基,苯基烷基,杂芳基烷基,任选地稠合到苯基,杂芳基或杂环基; A是-NR b B
摘要:
Die Erfindung betrifft 3,5-Dihydroxy-2,2-dimethyl-valeronitrile für die Synthese von Epothilon- und Epothilonderivaten und Verfahren zur Herstellung dieser neun Zwischenprodukte in der Synthese und die Verwendung zur Herstellung von Epothilonen oder Epothilonderivaten.
摘要:
Bereitgestellt wird ein Verfahren zur Herstellung von 4-Cyano- 3-hydroxybuttersäureestem durch Umsetzung eines 4-substituierten 3-Hydroxybuttersäureesters mit einern Cyanidsalz in einern organischen Lösungsmittel in Gegenwart eines oder mehrerer weiterer Salze.
摘要:
The present invention relates to a process for preparing (R)-4-cyano-3-hydroxybutyric acid ester derivatives and more particularly, to a process for preparing optically pure (R)-4-cyano-3-hydroxybutyric acid ester derivatives expressed by formula (1) in high yield by performing cyanation and sequential esterification of (S)-3,4-epoxybutyric acid salt as a starting material. In said formula, R represents linear or branched alkyl group with 1 SIMILAR 5 carbon atoms or benzyl group.
摘要:
A process whereby 6-cyanomethyl-1,3-dioxane-4-acetic acid derivatives, which are important intermediates of an HMG coenzyme A reductase atorvastatin, can be industrially, easily and efficiently produced. This process comprises starting with a 3,5-dihydroxy-6-halohexane derivative, treating it with a cyaniding agent to thereby substitute the halogen atom with the cyano group (i.e., a cyanation reaction) and forming an acetal of a diol by using an acetal-forming agent in the presence of an acid catalyst (i.e., an acetal-formation reaction).
摘要:
An improved process for the preparation of cis-1,3-diols is described where a beta hydroxy ketone is treated with a trialkylborane or dialkylalkoxyborane or a mixture of a trialkylborane and a dialkylalkoxyborane followed by recovery and reuse of the alkylborane species to convert additional beta hydroxy ketone to the cis-1,3-diol.
摘要:
A process is provided for the reversible coupling of weak nucleophiles to the carbon-carbon double bond of 2-cyanoacrylic acid or an ester thereof so as to reversibly protect the bond. Examples of weak nucleophiles include alcohols (including diols and polyols), phenols, sulfur nucleophiles such as thiols and thio acids, phosphorus nucleophiles such as dialkyl or diarylphosphites and phosphines, and carbon nucleophiles such as active methylene compounds. The process involves reacting 2-cyanoacrylic acid or an ester thereof with the weak nucleophile in the presence of an inert solvent under polymerisation inhibiting conditions and in the presence of an acidic catalyst. The compounds produced can be used as intermediates for the preparation of poly(cyanoacrylates), following elimination of the nucleophile added to give a 2-cyanoacrylate monomer which then polymerizes. The poly(cyanoacrylates) thereby produced have many applications, for example, in the preparation of films such as single- or multi-layer Langmuir-Blodgett films.