73033AST

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Showing 1-30 of 32 results for "73033AST" within Papers

Synthesis of optically active bisdifluorocyclopropanes through a chemo-enzymatic reaction strategy

Mitsukura, Koichi, et al.

Tetrahedron Letters, 40 (31), 5739-5742 (1999)

Capillary gas chromatography using a γ-cyclodextrin for enantiomeric separation of methylamphetamine, its precursors and chloro intermediates after optimization of the derivatization reaction.

Justyna M Płotka et al.

Journal of chromatography. A, 1347, 146-156 (2014-05-13)

The enantiomeric ratio of methylamphetamine (MAMP) is closely related to the optical activity of precursors and reagents used for the synthesis and this knowledge can provide useful information concerning the origins and synthetic methods used for illicit manufacture. The information

Kinetic resolutions concentrate the minor enantiomer and aid measurement of high enantiomeric purity.

Caron, Gaetan; Tseng, George W.M.; Kazlauskas, R.J.

Tetrahedron Asymmetry, 5 (1), 83-92 (1994)

Enantioselective cyclization of enamide-ynes and application to the synthesis of the kopsifoline core.

Britton K Corkey et al.

Tetrahedron, 69(27-28), 5640-5646 (2013-06-19)

We report the palladium-catalyzed enantioselective cyclization of 1,6-enamidynes to form spirocyclic ring systems. We applied this methodology to the concise synthesis of the skeletal core of the kopsifoline alkaloids.

Stabilization of cyclohexanone monooxygenase by a computationally designed disulfide bond spanning only one residue.

Hugo L van Beek et al.

FEBS open bio, 4, 168-174 (2014-03-22)

Enzyme stability is an important parameter in biocatalytic applications, and there is a strong need for efficient methods to generate robust enzymes. We investigated whether stabilizing disulfide bonds can be computationally designed based on a model structure. In our approach

Asymmetric ring opening of meso-epoxides with B-halobis(2-isocaranyl)boranes 2-dIcr2BX

Roy, Chandra D., Brown, Herbert C.

Tetrahedron Asymmetry, 17 (13), 1931-1936 (2006)

Substrate enantioselectivity m the rabbit liver microsomal epoxide hydrolase catalyzed hydrolysis of trans and cis 1-phenylpropene oxides. A comparison with styrene oxide

Bellucci, Giuseppe, et al.

Tetrahedron Asymmetry, 4 (6), 1153-1160 (1993)

Catalytic asymmetric synthesis of Japonilure and its enantiomer

Xu, Hao, et al.

Tetrahedron Asymmetry, 25 (20-21), 1372-1375 (2014)

Asymmetric epoxidation catalyzed by esters of a-hydroxy-8-oxabicyclo[3.2.1]octan-3-one

Armstrong, A., et al.

Tetrahedron Asymmetry, 12 (20), 2779-2781 (2001)

Enantiomeric impurities in chiral catalysts, auxiliaries, and synthons used in enantioselective syntheses. Part 4

Qui, Haiziao, et al.

Tetrahedron Asymmetry, 24 (18), 1134-1141 (2013)

Alkali metal fluorides as efficient fluorinating agents. Enantiocontroued synthesis of 2-fluoroalkyl carboxylates and 1-fluoroalkyl benzenes

Fritz-Langhals, Eike

Tetrahedron Asymmetry, 5 (6), 981-986 (1994)

Investigation of a novel diamine based chiral auxiliary in the asymmetric alkylation of ketones

Clarke, Sarah L, et al.

Tetrahedron Asymmetry, 25 (4), 356-361 (2014)

Sequential kinetic resolution of (?)-2,3-butanediol in organic solvent using lipase from Pseudomonas cepacia.

Caron, Gaetan; Kazlauskas, R.J.

Tetrahedron Asymmetry, 4 (9), 1995-2000 (1993)

Cloning and characterization of three epoxide hydrolases from a marine bacterium, Erythrobacter litoralis HTCC2594.

Jung-Hee Woo et al.

Applied microbiology and biotechnology, 76(2), 365-375 (2007-06-02)

Previously, we reported that ten strains belonging to Erythrobacter showed epoxide hydrolase (EHase) activities toward various epoxide substrates. Three genes encoding putative EHases were identified by analyzing open reading frames of Erythrobacter litoralis HTCC2594. Despite low similarities to reported EHases

Organocatalysis using protonated 1,2-diamino-1,2-diphenylethane for asymmetric Diels?Alder reaction

Hoon Kim, Kyoung, et al.

Tetrahedron Letters, 46 (36), 5991-5994 (2005)

Separation of racemic sulfoxides and sulfinate esters on four derivatized cyclodextrin chiral stationary phases using capillary gas chromatography.

Jared L Anderson et al.

Journal of chromatography. A, 946(1-2), 197-208 (2002-03-05)

The separation of 17 chiral sulfoxides and eight chiral sulfinate esters by gas chromatography (GC) on four derivatized cyclodextrin chiral stationary phases (CSPs) (Chiraldex G-TA, G-BP, G-PN, B-DM) is presented. Many of these compounds are structural isomers or part of

Isolation of racemic 2,4-pentanediol and 2,5-hexanediol from commercial mixtures of racemic and meso isomers by way of cyclic sulfites.

Caron, Gaetan; Kazlauskas, R.J.

Tetrahedron Asymmetry, 5 (4), 657-664 (1994)

The asymmetric hydrogenation of 2-phenethylacrylic acid as the key step for the enantioselective synthesis of Citralis Nitrile?

Scrivanti, Alberto, et al.

Tetrahedron Letters, 47 (52), 9261-9265 (2006)

Enantioselective gas chromatographic analysis of aqueous samples by on-line derivatisation. Application to enzymatic reactions.

John H M Mommers et al.

Journal of chromatography. A, 1182(2), 215-218 (2008-02-02)

A new gas chromatography (GC) method is presented for analysing both the conversion and the enantiomeric excess (e.e.) of samples from alcohol dehydrogenase reactions. The chiral compounds studied were a series of saturated, straight chain alcohols, ranging from 2-butanol to

Enantiomeric impurities in chiral synthons, catalysts, and auxiliaries. Part 3.

Ke Huang et al.

Tetrahedron, asymmetry, 17(19), 2821-2832 (2006-10-27)

The enantiomeric excess of chiral reagents used in asymmetric syntheses directly affects the reaction selectivity and product purity. In this work, 84 of the more recently available chiral compounds were evaluated to determine their actual enantiomeric composition. These compounds are

The synthesis of enantioenriched a-hydroxy esters

Gu, Xin, et al.

Tetrahedron Asymmetry, 25 (24), 1573-1580 (2014)

An asymmetric synthesis of the key precursor to (-)-indolizomycin

Groaning, Michael; Meyers, A.I.

Tetrahedron Letters, 40 (25), 4639-4642 (1999)

Asymmetric reduction of a-keto acetals with potassium 9-O-(1,2-isopropylidene-5-deoxy-D-xylofuranosyl)-9-boratabicyclo[3.3.1]nonane. Enantioselective synthesis of a-hydroxy acetals with high optical purities

Tae Cho, B; Sung Chun, Y;

Tetrahedron Asymmetry, 5 (7), 1147-1150 (1994)

Asymmetric conjugate addition to alkylidene malonates

Alexakis, Alexandre; Benhaim, Cyril;

Tetrahedron Asymmetry, 12 (8), 1151-1157 (2001)

Gas chromatographic enantiomer separation of C-3 and C-4 synthons: prediction of absolute configuration from elution order and enzymatic resolution

Hoff et al.

Chirality, 11(10), 760-767 (1999-11-24)

Enantiomers of C-3 secondary alcohols, 3-hydroxybutanoates, and cyclic 1,3-dithioacetals were separated by chiral GLC using CP-Chirasil-Dex CB and Chiraldex G-TA columns. The former was most successful for analysis of n-alkyl esters of secondary alcohols and the separation depended on the

The rabbit liver microsomal biotransformation of 1,1-dialkylethylenes: enantioface selection of epoxidation and enantioselectivity of epoxide hydrolysis.

G Bellucci et al.

Chirality, 6(3), 207-212 (1994-01-01)

The rabbit liver microsomal biotransformation of alpha-methylstyrene (1a), 2-methyl-1-hexene (1b), 2,4,4-trimethyl-1-pentene (1c), and 1,3,3-trimethyl-1-butene (1d) has been investigated with the aim at establishing the enantioface selection of the cytochrome P-450-promoted epoxidation of the double bond and the enantioselectivity of microsomal

Comparative stereochemistry of the fragmentations of oxychlorocarbenes, chlorocarbonates, and chlorosulfites in the 3-nortricyclyl/5-norbornen-2-yl system

Moss, Robert A., Fu, Xiaolin

Tetrahedron Letters, 47 (3), 357-361 (2006)

Directed evolution of epoxide hydrolase from A. radiobacter toward higher enantioselectivity by error-prone PCR and DNA shuffling.

Bert van Loo et al.

Chemistry & biology, 11(7), 981-990 (2004-07-24)

The enantioselectivity of epoxide hydrolase from Agrobacterium radiobacter (EchA) was improved using error-prone PCR and DNA shuffling. An agar plate assay was used to screen the mutant libraries for activity. Screening for improved enantioselectivity was subsequently done by spectrophotometric progress

Diastereoselective synthesis of a key intermediate for the preparation of tricyclic ?-lactam antibiotics

Matsumoto, Takaji, et al.

Tetrahedron Letters, 40 (27), 5043-5046 (1999)

Asymmetric reduction of ketoxime derivatives and N-alkylketimines with borane?oxazaborolidine adducts

Krzeminsit, Marek P.; Zaidlewicz, Marek

Tetrahedron Asymmetry, 14 (11), 1463-1466 (2003)

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