Patents in Class 548/498

Matches 1 - 44 out of 44

Match	Document	Document Title
1	5994560	Resolution of racemic mixtures using polymers containing chiral units Described herein is a novel process to resolve a racemic compound into its optically active isomers without need for chemical transformation such as salt formation. The process advantageously...
2	5892112	Process for preparing synthetic matrix metalloprotease inhibitors Synthetic mammalian matrix metalloprotease inhibitors are disclosed that are useful for treating or preventing diseases wherein said diseases are caused by unwanted mammalian matrix metalloprotease...
3	5329014	Method for recovering optically active tryptophan Optically active tryptophan of high purity can be obtained in high yields from a tryptophan fermentation broth, using crystallization of optically active tryptophan hydrochloride in combination...
4	4978759	Process for the stereospecific synthesis of optically pure 4-amino-3-hydroxycarboxylic acid derivatives The process described makes it possible to obtain optically pure 4-amino-3-hydroxycarboxylic acids by means of a series of stereoselective steps. The starting material is an alpha-amino acid in the...
5	4918196	Process for recimization of an optically active alpha-amino acid amides and process for producing optically active alpha-amino acids A process for optically isomerizing an optically active alpha-amino acid amide comprising heating a D-alpha-amino acid amide or an L-alpha-amino acid amide in the presence of a strongly basic...
6	4904654	7-chloro-5,6-dihydro-3-(5-(2-hydroxy-isoprop yl)-1,2,4-oxadiazol-3-yl)-5-methyl-6-oxo-4H-imidazo[1,5a][1,4]benzodiazep ine A metabolite of the known anxiolytic agent, 7-chloro-5,6-dihydro-3-(5-isopropyl-1,2,4-oxadiazol-3-yl)-5- methyl-6-oxo-4 H- imidazo[1,5a][1,4]benzodiazepine is a 2-hydroxy derivative of the...
7	4772599	Benzodiazepine derivatives and their preparation and use New benzodiazepine derivatives of the general formula ##STR1## wherein X 1 and X 2 independently are ##STR2## wherein R 1 is C 1 -3 -alkyl, C 3 -5 -cycloalkyl, C 1 -3 -alkoxymethyl, C 1 -3...
8	4718994	Method for preparing hydroxy compounds of aromatic and heteroaromatic series A method for perparing hydroxy compounds of the aromatic and heteroaromatic series of the general formula: ##STR1## wherein when R 1 --COOH, --CH 2 CH(NH 2 )COOH then R 2 --OH, --H,...
9	4713470	Racemization of amino acids There is disclosed a process for the racemization of amino acids and derivatives thereof. The racemization process of the present invention uses an aromatic aldehyde-containing polymer made from...
10	4610827	Amino acid complex and a method for optical resolution of a DL-amino acid A method for optical resolution of a DL-amino acid comprising reacting the DL-amino acid with an optically active N-acyl aspartic acid in a solvent or mixture of solvents, and separating the...
11	4602096	Process for the racemization of N-acetyl-D,L-α-aminocarboxylic acids N-acetyl-D(L)-α-aminocarboxylic acids are thermally racemized by melting, adding a small amount of acetic anhydride to the melt and heating to a temperature between the melting temperature and...
12	4588818	Method for recovery of optically active tryptophane A method for recovery of optically active tryptophane, which comprises filtering a solution of optically active tryptophane containing impurities through a semi-permeable membrane; adding a lower...
13	4540792	Process for the preparation of a free L α-amino acid This invention relates to a process for the preparation of free L α-amino acids by the complete conversion of their D antipodes taken individually or possibly in racemic mixtures. The process...
14	4519955	Method for optical resolution of DL-α-amino acid or (±)-α-phenylethanesulfonic acid α-(S)-amino acid.α-phenylethanesulfonate compounds and methods of optical resolution of α-amino acids and α-phenylethanesulfonic acids are described.
15	4481362	Process for preparing optically active tryptophanes Biochemical optical resolution of DL-tryptophanes in which DL-tryptophane amides are interacted with the culture products, or their treated products, of a microorganism capable of producing amidase...
16	4440936	Rhodium-phosphine chiral hydrogenation catalysis of acetophenone, atropic acid, and alpha-acylamidoacrylic acids and esters thereof The chiral phosphine ligand (R)-1,2-bis(diphenylphosphino)-1-cyclohexylethane, when complexed to Rh(I), functions as a superior chiral hydrogenation catalyst. The chiral phosphine ligand is more...
17	4379941	Resolution of racemic amino acids Racemic amino acids can be readily resolved by conversion to their diastereomeric esters of an optically active 2-isopropyl-5-methylcyclohexanol and separating the diastereomers by chromatography....
18	4275217	Process for the preparation of optically active α-amino acids and their derivatives A chiral α-amino acid having a hydrogen substituent in a position alpha to the carboxylic function thereof is prepared by subjecting a corresponding optical antipode with a chiral amino acid to a...
19	4124533	Metal coordination complexes containing optically active phosphine or arsine ligands Process for the homogeneous catalytic hydrogenation of β-substituted-α-acylamido-acrylic acids which yields, after hydrogenation, an optically active mixture. The process comprises the...
20	4072698	Resolution of aminonitriles The present invention is a chemical method for obtaining an optically pure 2-aminonitrile or a 2-aminoamide from (1) an optically impure mixture, (2) a racemic mixture, or (3) the optically pure...
21	4072691	Process for the resolution of DL-6-chlorotryptophan Seed crystals of one optically active enantiomer of 6-chlorotryptophan methanesulfonate or 6-chlorotryptophan benzenesulfonate are added to a supersaturated solution of DL-6-chlorotryptophan...
22	3991077	Method of racemizing optically active N-acylamino acids Optically active amino acids N-acylated with carboxylic acids are readily racemized without decomposition at elevated temperature in inert organic solvents in which they are homogeneously soluble...
23	3976680	Production of an ester of one enantiomer of an α-amino acid in the form of a salt with an optically active acid A process for the production of an ester of one enantiomer of an α-amino acid in the form of a salt with an optically active acid, which comprises reacting an ester of the opposite enantiomer of...
24	3904646	Resolution of tryptophan using benzenesulfonic acid and p-phenolsulfonic acid Seed crystals of one optically active enantiomer of tryptophan benzenesulfonate or tryptophan p-phenolsulfonate are added to a supersaturated solution of DL-tryptophan benzenesulfonate or...
25	3901915	Optical resolution of organic carboxylic acids Racemic organic carboxylic acids are efficiently resolved into their enantiomers with antipodes of α-methyl-p-nitrobenzylamine.
26	3869472	3-Indolyl aliphatic acid derivatives N-acylated 3-indolyl acetic acid derivatives having anti-inflammatory, analgesic, antipyretic and anti-cholesterolemic activities and being useful as an intermediate for anti-inflammatory drugs...
27	3532684	MOLECULAR COMPOUNDS OF INOSINE AND TRYPTOPHAN
28	3527671	PROCEDURE FOR THE SEPARATION OF ISOTOPECONTAINING AMINO ACID RACEMATES INTO THEIR OPTICAL D- AND L-ANTIPODES
29	3480645	PROCESS FOR OPTICAL RESOLUTION OF RACEMIC PANTOLACTONE
30	3381031	Resolution of racemic amino acids
31	3213106	Process of racemizing optically active alpha acids
32	3168527	1-aryl-5-(p-fluorophenyl)-pyrrole-2-propionic acid compounds
33	3167566	Resolution of dl-tryptophane and dl-alpha-phenylethylamine
34	3149122	Resolution of ammonium nu-acyl-dltryptophanates
35	3094537	Resolution of acetyl-di-tryptophan
36	3056799	Processes and intermediate products
37	3028430	Process for the production of optically active isomers of amphetamine
38	3028395	Process for the resolution of optically active acids
39	2957917	Resolution of organic compounds and apparatus therefor
40	2957886	Resolution procedures and apparatus therefor
41	2865928	Resolution of n-acyl-dl-tryptophans
42	2813876	Resolution of tryptophane derivatives
43	2797226	Process of resolving dl-acyl tryptophan compounds and products obtained thereby
44	3825559	Title is not available

Matches 1 - 44 out of 44