Abstract:
The present invention relates to a production method of (R)-3-hydroxy-3-(2-phenylethyl)hexanoic acid which comprises optical resolution of racemic 3-hydroxy-3-(2-phenylethyl)hexanoic acid with an optically active amine of the formula (VIII) wherein R 2 is 3,4-dimethoxyphenyl or 2-chlorophenyl. According to the present invention, (R)-3-hydroxy-3-(2-phenylethyl)hexanoic acid useful as a starting material of a pharmaceutical agent can be efficiently produced with a high optical purity and a relatively high total yield.
Abstract:
This invention relates to a method for manufacturing aromatic compounds having the following formula (II) comprising the step of reacting an unsaturated aromatic compound having the following formula (I) with an aryl compound containing an iodosyl group or the salt thereof within a temperature range of from -50 to 200 o C:
Abstract:
Die Erfindung betrifft Riech- und/oder Geschmackstoffkompositionen, die durch einen Gehalt an einer Verbindung der Formel worin die Reste R 2 bis R 8 für Wasserstoff oder Methyl stehen und n = 1 oder 2 ist, gekennzeichnet sind. Die Erfindung betrifft auch die Verwendung von I als Riech- und/oder Geschmackstoffe. Die Verbindungen der Formel I sind, mit Ausnahme des 1,1- Dimethyl-3-cyanoindans, neu. Die neuen I bilden ebenfalls Gegenstand der Erfindung.
Abstract:
A phenylacetone or its derivative having the general formula (I): wherein X. Y, and Z are independently a hydrogen atom, a hydroxyl group, a halogen atom, a nitro group, an amino group, a lower alkyl group having 1 to 6 carbon atoms, a lower alkoxy group having 1 to 6 carbon atoms, or a benzyloxy group and any two substituents of X, Y, and Z may form, together with the benzene ring, a heterocycling ring having 5 to 7 members including 1 or 2 oxygen atoms is produced at a high yield and a high selectivity by reacting a 3-phenylpropylene or its derivative having the general formula (II): wherein X, Y and Z are as defined above, with an alkyl nitrite having the general formula (III): wherein R is an aliphatic, aromatic or alicyclic saturated or unsaturated hydrocarbon group in the presence of (a) water, (b) an alcohol, (c) a palladium catalyst, and (d) an optional amine or copper compound, or by reacting the above-mentioned 3-phenylpropylene or its derivative with the above-mentioned alkyl nitrite in the presence of (a) an alcohol, (b) a palladium catalyst and (c) an optional amine or copper compound to form 1-phemrl-2,2-dialkoxypropane or it derivative having the general formula (IV): wherein X, Y, Z and R are as defined above, followed by hydrolyzing the reaction product.
Title translation:NOUVEAU PROCEDE DE PREPARATION D'INTERMEDIAIRES DE SYNTHES RETILISANT DES PRODUITS OR ORIGINE NATURELLE ET APPLICATION DES INTERMEDAIRES OBTENUS
Abstract:
The present invention relates to a process for preparing a product of formula I: characterized in that the reaction is catalyzed both by thiamine or a thiamine salt and by ascorbic acid in a form which is free or salified or an organic acid salt of an alkaline metal, preferably sodium acetate, potassium tartrate, sodium succinate, or a reductone, preferably 2-hydroxypropanedial or 2,3-dihydroxycyclopent-2-ene-1-one in an organic solvent.
Abstract:
The invention relates to novel 2-iodo-imidazole derivatives, to a method for producing said compounds, to agents containing said compounds, and to the use thereof as biologically active compounds, in particular for fighting harmful microorganisms in plant protection, in material protection, and as plant growth regulators.
Abstract:
An aspect of the present application relates to the use of catalysts comprising these ligands in transition metal-catalyzed carbon-heteroatom and carbon-carbon bond-forming reactions. The subject methods provide improvements in many features of the transition metal-catalyzed reactions, including the range of suitable substrates, reaction conditions, and efficiency.