Patents
Sitemap › C07 - Organic chemistry › C07B - General methods of organic chemistry; Apparatus therefor › C07B 53 - Asymmetric syntheses
Patents for C07B 53 - Asymmetric syntheses (6,231)
07/1991
07/17/1991CN1053010A Pharmaceutical preparation
07/02/1991US5028731 Preparation of mixtures of cypermethrin or cyfluthrin isomers enriched in more active species
06/1991
06/19/1991EP0432898A2 Glutaric acid derivatives and preparation thereof
06/05/1991EP0430621A2 Process for the preparation of chiral 3,4-epoxy benzopyrans
06/04/1991US5021593 Ruthenium-optically active phosphine complex
05/1991
05/30/1991CA2030969A1 Process
05/29/1991EP0429223A1 Process for preparing enantiomerically pure alpha-amino acids
05/29/1991CN1051725A Glutaric acid derivatives and preparations thereof
05/22/1991EP0428392A2 Optically active compounds having plural chiral centers and the production thereof
05/18/1991WO1991007379A1 Preparation of mixtures of cypermethrin or cyfluthrin isomers enriched in more active species
05/15/1991EP0427396A2 Process for producing optically active fluorine-containing 3-hydroxybutyric acid esters
05/07/1991CA1283921C2 Optically active pyrrolidinedione and pyrrolidinone derivatives
05/02/1991WO1991005777A1 Chiral sultams
05/02/1991EP0425378A1 1,3,4-Trisubstituted azetidin-2-one derivatives, useful intermediates for synthesis of beta-lactames, and their process of asymmetrical preparation
04/1991
04/30/1991US5012002 2,2'-bis(di-(m-tolyl)phosphino)-1,1'-binaphthyl
04/30/1991US5011995 Hydrogenation of N-Aliphatic Keimines Using A Complex Iridium Catalyst
04/26/1991CA2028458A1 Azetidin-2-one, 1,3,4-trisubstituted derivatives, useful intermediates for the beta-lactam synthesis, and asymetric synthesis process thereof
04/24/1991EP0423300A1 Chiral reaction medium for organic reactions.
04/17/1991EP0422944A1 Chiral sultams
04/16/1991US5008391 Chemical intermediates for antimetabolites
04/10/1991EP0421283A2 A new process for preparing optically active 3-substituted azetidinones
04/03/1991EP0420658A2 A catalyst for asymmetric induction
04/03/1991CN1050373A Process for preparing optically active 2-aryl-alkanoic acid, in particular 2-aryl propionic
04/02/1991CA1282410C Process for the preparation of optically active ó-arylalkanoic acids and novel intermediates thereof
03/1991
03/30/1991CA2025357A1 Catalyst for asymmetric induction
03/27/1991EP0419409A2 Iridium complexes, process for their preparation and their use
03/27/1991EP0419312A1 Method for the production of optically active 2-aryl-propionic acids
03/27/1991CN1050185A Process for preparing clausenamide and neoclausenamide, and of their derivatives
03/26/1991US5003083 Process for preparing optically active cyano compound
03/26/1991US5003074 N-fluorinated sulfonamides
03/19/1991CA1281732C Iridium complexes and the use thereof
03/06/1991CA2024546A1 Process for the preparation of optically active aryl-2 propionic acids
03/05/1991US4997964 Catalysts
03/05/1991CA1281029C Optically active ketals, processes for their preparation and their use in the synthesis of ó-arylakanoic acids
02/1991
02/27/1991EP0414610A1 Process for the enantioselective preparation of phenylisoserine derivatives
02/27/1991EP0414020A2 Process for the preparation of clausenamide and neoclausenamide and their derivatives
02/26/1991US4996361 Process for the preparation of optically active secondary arylamines
02/26/1991US4996349 Enantioselective process
02/19/1991US4994615 Process for the preparation of optically active secondary arylamines
02/05/1991US4990676 Reacting single enantiomer of chiral complex with carbanion
02/05/1991US4990669 Optically active α-amino aldehydes, process for the preparation thereof, and the use thereof for the stereoselective preparation of optically active β-amino alcohols
02/05/1991US4990496 (-)-(1s)-1-(2',2'-6'-trimethyl-2'-cyclo-hexene-1'-yl)-2-butene-1-one
01/1991
01/29/1991US4988823 Fungicides, plant growth regulators, oxathianes
01/29/1991CA1279650C Process for the preparation of beta-butyrolactams
01/23/1991EP0409049A2 Method for the stereoselective production of Z-1,2-diaryl-alkyl-chlorides and their conversion to azolylmethyloxiranes as well as intermediates
01/23/1991EP0408881A2 Process for the enantioselective preparation of gamma-keto-delta-amino-acid derivatives
01/16/1991EP0408340A2 Ruthenium-optically active phoshine complex useful as catalyst
01/16/1991EP0408338A2 Catalytic production of carboxylic acids and esters thereof
01/09/1991EP0407212A1 Enantioselective synthesis of antifolates
01/08/1991US4983739 Optically active styrene compounds
01/08/1991CA2304489A1 Enantioselective synthesis of antifolates
01/08/1991CA2304487A1 Enantioselective synthesis of antifolates
01/08/1991CA2304481A1 Enantioselective synthesis of antifolates
01/02/1991CN1048215A Improved synthesis of beta-lactams using metal compound
01/01/1991US4981998 Process for the preparation and purification of D-hydroxyphenoxypropionic acid
01/01/1991US4981992 Hydrogenation, ruthenium complex catalyst
12/1990
12/27/1990EP0404267A1 Improved synthesis of beta-lactams using a metal compound
12/22/1990CA2019619A1 Synthesis of beta-lactams using a metal compound
12/19/1990EP0403188A2 A compound of 2,2'-bis(diphenylphosphino)-1,1'-binaphthyl and catalytic complexes thereof
12/18/1990US4978759 Reacting meldrum*s acid with protected amino acid, cyclization decyclizing, reduction and deprotecting; statine
12/11/1990US4977279 Anticholesterol agents
12/11/1990US4976834 Asymmetric photochemical reaction process
11/1990
11/29/1990WO1990014073A1 Pharmaceutical preparation
11/27/1990US4973696 Stereoselective process for preparing optically active alpha, beta-disubstituted carbonyl compounds
11/27/1990CA1276943C Method for producing optically active amines
11/22/1990EP0398288A2 Process for preparing optically active 2-arylalkanoic acids, in particular 2-arylpropionic acids
11/22/1990EP0398287A1 Pharmaceutical preparation
11/22/1990EP0398132A2 Phosphorous compounds
11/16/1990CA2016888A1 Pharmaceutical preparation
11/16/1990CA2016887A1 Process for preparing optically active 2-aryl-alkanoic acids, in particular 2-aryl propionic acids
11/13/1990US4970313 Optically active 3-demethylmevalonic acid derivatives, and intermediates
11/07/1990EP0395729A1 Ligand-accelerated catalytic asymmetric dihydroxylation.
11/06/1990US4968814 Thioetherification
11/01/1990WO1990012773A1 Chiral reaction medium for organic reactions
10/1990
10/24/1990EP0288764B1 Optically active alpha-amino aldehydes, processes for their preparation and their use in the stereoselective preparation of optically active beta-amino alcohols
10/23/1990US4965372 Process and intermediates for isopropyl 3S-amino-2R-hydroxy-alkanoates
10/17/1990CN1010006B Production of chiral rhodium-diphosphine complexes and use in asymmetric hydrogenations
10/10/1990EP0210896B1 Optically pure derivates of 4-amino-3-hydroxycarboxylic acids and process for stereospecific synthesis
10/03/1990EP0390273A1 Resolution of a carboxylic acid
10/03/1990EP0389551A1 Stereoselective preparation of 3-substituted-4-(phenyl anilo) piperidine compounds and derivatives
10/02/1990CA1274846A1 PROCESS FOR ENANTIOSELECTIVE PRODUCTION OF .alpha.-VINYL- .alpha.-AMINO ACIDS
09/1990
09/30/1990CA2013523A1 Resolution of a carboxylic acid
09/19/1990EP0387605A2 Process for the stereoselective preparation of optically active S,S or R,R-beta-aminoalcohols
09/12/1990EP0387196A1 Complexes with optically active ligands, process for their preparation and their use
09/08/1990CA2011584A1 Complexes having optically active ligands, a process for their preparation and their use
09/05/1990EP0385658A1 Ring-substituted 2-amino 1,2,3,4-tetra-hydronaphthalenes and 3-aminochromanes
09/05/1990CN1045099A Ring-substituted 2-amino-1,2,3,4-tetrahydronaphthalenes and 3-aminochromanes
09/04/1990US4954644 Hydrogenation catalyst
09/04/1990US4954592 Hydrogenation catalysts
08/1990
08/28/1990US4952730 Formylation, reacting with a strong acid or an acid halide and hydrolysis
08/28/1990CA1273346A1 Optically pure 4-amino-3-hydroxycarboxylic acid derivatives and process for their stereospecific synthesis
08/27/1990CA2362972A1 Process for preparing ring-substituted 2-amino-1,2,3,4-tetra-hydronaphthalenes and 3-aminochromanes
08/22/1990CN1044817A 2-substituted-5-substituted-1, 3-oxathiolanes with antiviral properties
08/16/1990EP0382526A2 Substituted -1,3-oxathiolanes with antiviral properties
08/14/1990US4948913 Renin inhibitors containing 5-amino-2,5-disubstituted-4-hydroxypentanoic acid residues
08/01/1990EP0380144A1 Process for producing optically active benzene-sulfonamide derivatives
08/01/1990EP0379917A2 Optically active (meth)acrylic-acid derivatives, their preparation, their polymerisation into optically active polymers and their use
07/1990
07/31/1990CA1272213A1 Process for inverting the configuration of optically active compounds, and optically active intermediates produced in this process
07/25/1990EP0379288A1 Process and intermediates for isopropyl 3S-amino-2R-hydroxyalkanoates
07/24/1990US4943652 Process for asymmetrically reducing carbonyl compounds
1 ... 50 51 52 53 54 55 56 57 58 59 60 61 62 63