摘要:
The present invention relates to a process for cleaving optically active amides to carboxylic acids and optically active amines with retention of the center of chirality, wherein the amides are hydrolyzed in the presence of a polyol or of an amino alcohol and of an alkali metal or alkaline earth metal hydroxide.
摘要:
A process for preparing optically active primary and secondary heteroatom-substituted amines from the corresponding racemates, which comprises a) enantioselective acylation of a racemic heteroatom-substituted amine with an ester whose acid component carries a fluorine, nitrogen, phosphorus, oxygen or sulfur atom in the vicinity of the carbonyl carbon, in the presence of a hydrolase, b) separation of the mixture of optically active heteroatom-substituted amine and optically active acylated heteroatom-substituted amine to obtain one enantiomer of the heteroatom-substituted amine, c) if required isolation of the other enantiomer of the heteroatom-substituted amine from the acylated heteroatom-substituted amine by amide cleavage.
摘要:
The present invention relates to the preparation of isomerically pure substituted cyclohexanols starting from a mixture of cis/trans substituted cyclohexanols which comprises reacting the cis/trans mixture of a substituted cyclohexanol with a dicarboxylic acid anhydride in the presence of a lipase, to give the trans semi-ester which is separated off from the unreacted substituted cyclohexanol cis isomer.
摘要:
The present invention relates to a process for hydrolyzing optically active amides to carboxylic acids and optically active amines with retention of the center of chirality, where the hydrolysis of the amides is carried out with an alkali metal or alkaline earth metal hydroxide in the presence of 5-30% by weight, based on the amide employed, of a polyol or an amino alcohol.
摘要:
A method for preparing optically active methyl 4-(1-ammoniumethyl)benzoate sulfate by reacting racemic methyl 4-(1-aminoethyl)benzoate with an acylating agent in the presence of a lipase to give methyl 4-(1-aminoethyl)benzoate and subsequently precipitating methyl 4-(1-ammoniumethyl)benzoate sulfate by adding sulfuric acid.
摘要:
The invention relates to a method for the enantioselective N-acylation of aminoalkylphenols, and to a method for producing enantiomer-pure compounds of formulae (I-S) and/or (I-R).
摘要:
7-(R)-Aminotriazolopyrimidines of the formula I where the substituents and the index are as defined below: R1 is hydrogen or methyl; R2 is methyl; R3 is C2-C1o-alkyl, C1-C4-alkoxymethyl, C3-C1o-cycloalkyl; R4 is halogen, Cl-C4-alkyl, C1-C4-haloalkyl or Cl-C4-alkoxy; n is a number from 1 to 5; Y is halogen, cyano, Cl-C4-alkyl or Cl-C4-alkoxy; where * is a center of chirality in the R configuration, processes for preparing these compounds, compositions comprising them and their use for controlling harmful fungi are described.
摘要:
A process for preparing optically active amines, a process for preparing racemic amines which can be resolved using optically active carboxylic acids or enzymes, and racemic and optically active amines and optically active amides are described.
摘要:
Aromatic vinyl compounds of the formula IAr--CH.dbd.CHR Iwhere Ar is an aromatic radical, and R is hydrogen, C.sub.1 -C.sub.4 -alkyl or unsubstituted or substituted phenyl, are prepared by reacting an alcohol of the formula IIAr--CH.sub.2 OH IIor an ester of the formula III ##STR1## where R' is hydrogen or C.sub.1 -C.sub.4 -alkyl, in aqueous solution with a triarylphosphine and a strong acid and then, in the presence of a mineral base, with an aldehyde of the formula IVR--CHO IV.
摘要翻译:芳族乙烯基化合物式Ar-CH = CHR I其中Ar是芳基,R是氢,C 1 -C 4烷基或未取代或取代的苯基,是通过使式II Ar-CH 2 OH II 或其中R'是氢或C 1 -C 4 - 烷基的式III'III的酯,在与三芳基膦和强酸的水溶液中,然后在无机碱的存在下,与式 IV R-CHO IV。