摘要:
The invention relates to a process for the preparation of 3-difluoromethyl-1-methyl-1H-pyrazole-4-carboxylic acid (9-dichloromethylene-1,2,3,4-tetrahydro-1,4-methano-naphthalen-5-yl)-amide.
摘要:
The present invention relates to a method of enantioselective addition to enones, including: reacting R3(CH2)pCH═CR5C(═O)Y(CH2)qR4 with R6ZnR7 in the presence of a compound represented by the following formula (I) and a transition metal catalyst, in which Y, p, q, R1, R2, R3, R4, R5, R6 and R7 are defined the same as the specification. Accordingly, the present invention can perform asymmetric conjugate addition in high yields and enantioselectivity.
摘要:
This invention aims at providing a catalyst for producing an optically active aldehyde or an optically active ketone, which is an optically active carbonyl compound, by carrying out selective asymmetric hydrogenation of an α,β-unsaturated carbonyl compound, particularly a catalyst which is insoluble in a reaction mixture for obtaining optically active citronellal which is useful as a flavor or fragrance, by carrying out selective asymmetric hydrogenation of citral, geranial or neral; and a method for producing a corresponding optically active carbonyl compound. The invention relates to a catalyst for asymmetric hydrogenation of an α,β-unsaturated carbonyl compound, which comprises a powder of at least one metal selected from metals belonging to Group 8 to Group 10 of the Periodic Table, or a metal-supported substance in which at least one metal selected from metals belonging to Group 8 to Group 10 of the Periodic Table is supported on a support, an optically active cyclic nitrogen-containing compound and an acid.
摘要:
A process for regenerating hydrogenation catalysts based on a platinum metal, where the hydrogenation catalysts based on a platinum metal are thermally regenerated at temperatures of from 50 to 600° C.
摘要:
Antimicrobially active 3-(4-hydroxy-3-methoxyphenyl)-1-(4-hydroxyphenyl)-1-propanone of the following formula 1 is described, as is a method for producing this compound and the use thereof as an antimicrobial active ingredient.
摘要:
Nonmetallic, chiral organic catalysts are used to catalyze the 1,4-hydride reduction of an α,β-unsaturated carbonyl compound. The α,β-unsaturated carbonyl compound may be an aldehyde or cyclic ketone, and the hydride donor may be a dihydropyridine. The reaction is enantioselective, and proceeds with a variety of hydride donors, catalysts, and substrates. The invention also provides compositions effective in carrying out the 1,4-hydride addition of α,β-unsaturated carbonyl compounds.
摘要:
Polyhalogenated cinnamic acids and cinnamic acid derivatives are prepared by reacting diazonium salts accessible from polyhalogenated anilines with acrylic acid or acrylic acid derivatives in the presence of a homogeneous, palladium-containing catalyst at about −5 to about +100° C. Some of the cinnamic acids and cinnamic acid derivatives obtainable in this way are new. Cinnamic acids and cinnamic acid derivatives which can be prepared according to the invention can be used for the preparation of indanones which are precursors for agro- and pharmaceutical chemicals and for substances having liquid-crystalline properties.
摘要:
The invention concerns a novel compounds of formula (I), wherein the dotted line bond is present or not, and wherein R1 represents: when the dotted line bond is present —CHCH3OH or —CHCH3OCOR or —CHCH3XCH2CHOHR′ or —CHCH3OCHR′CH2OH or formula (II) when the dotted line bond is absent —CHCH3OH or —CHCH3OCOR or —COCH3 or formula (II) or —CHCH3XCH2CHOHR′ or —CH2CH2XCH2CHOHR′ or —CHCH3OCHR′CH2OH or —CHCHCOR′ or —CH2CH2CHR′OH or —CH2CH2CHR′OCOR or CHCHCHOHR′ or —CHCHCHR′OCOR, wherein R represents H, Me, Et, Pr, isoPr, But, isoBut, CH3CH2)4, (CH3)2CHCH2, CH2CH, (CH3)2CCH, and R′ represents H, Me or Et, and X represents O, N or S, and their preparation method. Because of their fragrance, said compounds are highly interesting for the perfume industry, for cosmetic and care products.
摘要:
A process for the preparation of prostaglandin compounds having the formula (I): wherein A is selected from the group consisting of C1-C6 alkyl groups; C7-C16 aralkyl groups wherein an aryl portion thereof is unsubstituted or substituted with one to three substituents selected from the group consisting of C1-C6 alkyl groups, halo and CF3; and (CH2)nOR′ wherein n is an integer from 1 to 3 and R′ represents a C6-C10 aryl group which is unsubstituted or substituted with one to three substituents selected from the group consisting of C1-C6 alkyl groups, halo and CF3; B is selected from OR″ and NHR″ wherein R″ is C1-C6 alkyl groups; and represents a double bond or a single bond, is disclosed. Novel intermediates are also disclosed.
摘要:
The present invention relates to a method for synthesis of 2,2,6-trimethylcyclohexan-1-one (TMCH) by partial reduction of 2,6,6-trimethyl-2-cyclohexen-1,4-dione (ketoisophorone, KIP), the reaction being carried out in the gas phase in the presence of oxide catalysts.