Abstract:
PROBLEM TO BE SOLVED: To provide a method for resolution of racemic modification of an amino acid by an enzymatic catalytic reaction capable of assuring a high enantiomer reactivity, being used in a wide range of reaction conditions and requiring only a small amount of a catalyst as less as possible. SOLUTION: An optically active amino acid ester is produced from a racemic amino acid ester with an acid component as an acylating agent using a carboxylic acid ester containing a halogen atom, a nitrogen atom, an oxygen atom or a sulfur atom adjoining to a carbonyl carbon atom in the presence of a hydrolase selected from the group comprising an amidase, a protease, an esterase and a lipase and successively a nonacylated amino acid ester of an enantioselectively acylated amino acid ester is separated from another enantiomer.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing the subject β-hydroxy ester in high yield by reacting a β-keto ester with hydrogen in the presence of a ruthenium catalyst. SOLUTION: This method is to react (A) a β-keto ester with (B) hydrogen in the presence of (C) a catalyst of the formula, LRuX2 [X is a halogen, acetate or aryl; and L is a bidentate phospholane of the formula (B is an 1-6C crosslink between 2 Ps; R1 is H or an 1-6C alkyl or the like; R2 is alkyl or aryl; (m) is 0 or 1; and R3 is H or the like)], pref., at 0 to 100 deg.C under a pressure of 0.1 to 300 bars in an alkanol-containing solvent. The weight ratio of the component C to component A is pref. (1 to 10) to (1 to 1000,000). In the above reaction, it is preferable to add (D) 0.5 to 2 mol equivalents of acid esp. strong acid, (e.g. mineral acid or trifluoroacetic acid) to the component C.
Abstract:
The present invention relates to novel enzyme-containing polymers, having at least one of the following structural elements (1 and 2), wherein the abbreviations and symbols have the following meaning: E stands for enzyme; X , X independently represent oxygen, sulfur or NH from a functional group of the enzyme; Q represents hydrogen or group (a); A , A , A , A independently represent oxygen or sulfur; p is 0 or 1 with the proviso that A , A , A and A represent oxygen when p = 0; w is 1-4; q is 1-4; v is 1-100; R represents an optionally substituted or functionalized hydrocarbon group with two to five bonds; R represents an optionally substituted or functionalized hydrocarbon group with two to five bonds; R and R independently represent hydrogen, a C1-C4-alkyl, aryl or alkylaryl group. The invention further relates to a method for the production of said enzyme-containing polymers, their utilization as catalysts in chemical reactions and their use for separating enantiomer mixtures.
Abstract:
The present invention relates to catalytic patterns, the active components of which are A) metal complexes of general formula (I), in which the substituents have the following notation: M is a metal of the subgroup III, IV, V or VI in the periodic table of the elements or a metal of the lanthanide series; Y is a negative nucleofuge atom or a negative leaving group; X and X are neutral atoms or negatively loaded atoms from the main group IV, V or VI in the periodic table of the elements; Z is hydrogen, C1- to C10-alkyl, C3- to C10-cycloalkyl, C1- to C10-alkoxy, C1- to C10-alkylthiolat or dialkylamide with, in each case, 1 to 4 C-atoms in the alkyl residues; R to R are hydrogen, organocarbon or organosilicon residues, n is 0, 1 or 2, the valence of M is (2+n), and B) a metallocenium-ionizing compound.
Abstract:
The invention relates to a method for producing, in essence, enantiomer-pure 3-hydroxycarboxylic acids or esters of general formula (III) by reacting racemic oxetan-2-ones of general formula (I) with compounds R3-OH of general formula (II) in the presence of a lipase from Candida antarctica or Burkholderia plantarii, and separating the obtained products of formula (III) and (IV) from one another, and the radicals have the following meanings: R 1 , R 2 and R 3 , independent of one another, represent H, C 1 -C 10 -substituted or unsubstituted alkyl, and substituted or unsubstituted aryl or hetaryl, whereby R 1 and R 2 cannot have the same meaning at the same time.
Abstract:
The invention relates to a method for producing the optically active alkanols of formula (I), wherein n is an integer of from 0 to 5; Cyc represents an optionally substituted, mononuclear or polynuclear, saturated or unsaturated, carbocylic or heterocyclic ring, and R
Abstract:
The invention relates to a method for producing optically active 2-methylalkane-1-ol of general formula (III), comprising the following steps: (i) carbonyl-selective reduction of 2-methylalk-2-en-1-al of general formula (I) to 2-methylalk-2-en-1-ol of general formula (II), (ii) enantioselective hydration of 2-methylalk-2-en-1-ol to give the compound of general formula (III), (iii) increasing the optical yield of the optically active 2-methylalkane-1-ol (III) obtained in step (ii) by way of a lipase-catalyzed acylation reaction, whereby R represents C 1 -C 10 alkyl.
Abstract:
The invention relates to enzymatic and non-enzymatic methods for the production of 3-methylamino-1-(thiene-2-yl)-propane-1-ol; in addition to enzymes for carrying out said method; nucleic acid sequences coding for said enzymes, expression cassettes containing them, vectors and recombinant hosts.
Abstract:
The invention concerns a method for producing optically active alcohols of formula (I) by means of enzymatic reduction of the corresponding ketones, in particular, the production of (1S)-3-methylamino-1-(2-thienyl)-propane-1-ol and (1S)-3-chlorine-1-(2-thienyl)-propane-1-ol.