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Journal articles on the topic 'Stereoselective analysis'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 February 2022

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1

Czerwenka, Christoph, and Wolfgang Lindner. "Stereoselective peptide analysis." Analytical and Bioanalytical Chemistry 382, no. 3 (2005): 599–638. http://dx.doi.org/10.1007/s00216-005-3091-x.

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2

Ružena, Čižmáriková, Valentová Jindra та Horáková Renáta. "Chirality of β2-agonists. An overview of pharmacological activity, stereoselective analysis, and synthesis". Open Chemistry 18, № 1 (2020): 628–47. http://dx.doi.org/10.1515/chem-2020-0056.

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Abstractβ2-Agonists (β2-adrenergic agonists, bronchodilatants, and sympathomimetic drugs) are a group of drugs that are mainly used in asthma and obstructive pulmonary diseases. In practice, the substances used to contain one or more stereogenic centers in their structure and their enantiomers exhibit different pharmacological properties. In terms of bronchodilatory activity, (R)-enantiomers showed higher activity. The investigation of stereoselectivity in action and disposition of chiral drugs together with the preparation of pure enantiomer drugs calls for efficient stereoselective analytica

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3

Guo, Wenna, Zhiyong Li, Meng Yuan, et al. "Molecular Insight into Stereoselective ADME Characteristics of C20-24 Epimeric Epoxides of Protopanaxadiol by Docking Analysis." Biomolecules 10, no. 1 (2020): 112. http://dx.doi.org/10.3390/biom10010112.

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Chirality is a common phenomenon, and it is meaningful to explore interactions between stereoselective bio-macromolecules and chiral small molecules with preclinical and clinical significance. Protopanaxadiol-type ginsenosides are main effective ingredients in ginseng and are prone to biotransformation into a pair of ocotillol C20-24 epoxide epimers, namely, (20S,24S)-epoxy-dammarane-3,12,25-triol (24S-PDQ) and (20S,24R)-epoxy dammarane-3,12,25-triol (24R-PDQ) that display stereoselective fate in vivo. However, possible molecular mechanisms involved are still unclear. The present study aimed t

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4

Volland, Christine, Helen Sun, and Leslie Z. Benet. "Stereoselective analysis of fenoprofen and its metabolites." Journal of Chromatography B: Biomedical Sciences and Applications 534 (January 1990): 127–38. http://dx.doi.org/10.1016/s0378-4347(00)82155-6.

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5

Srinivas, N. R., W. C. Shyu, V. R. Shah, D. A. Campbell, and R. H. Barbhaiya. "Stereoselective analysis of nadolol in human plasma." Biomedical Chromatography 9, no. 5 (1995): 226–28. http://dx.doi.org/10.1002/bmc.1130090507.

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6

Juárez, Ernesto, Adriana García, Herbert Hommer, Magali Salas, and Barbara Gordillo. "Stereoselective synthesis and conformational analysis of aromaticC-thionucleosides." Heteroatom Chemistry 17, no. 4 (2006): 289–98. http://dx.doi.org/10.1002/hc.20205.

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7

Ducrot, Pierre, Robert Bucourt, Claude Thal, Bernard Marçot, Joëlle Mayrargue, and Henri Moskowitz. "Conformational analysis of stereoselective epoxidations in flexible systems." Tetrahedron 52, no. 19 (1996): 6699–704. http://dx.doi.org/10.1016/0040-4020(96)00320-1.

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8

Graham, Ronald J., and Larry Weiler. "The stereoselective alkylation and conformational analysis of 15-hexadecanolide." Tetrahedron Letters 32, no. 8 (1991): 1027–30. http://dx.doi.org/10.1016/s0040-4039(00)74478-9.

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9

Tangara, Salia, Alice Kanazawa, Martine Fayolle, et al. "Short synthesis, X-ray and conformational analysis of a cyclic peracetylated l-sorbose-derived nitrone, a useful intermediate towards N–O-containing d-gluco-iminosugars." New Journal of Chemistry 42, no. 20 (2018): 16735–43. http://dx.doi.org/10.1039/c8nj03868f.

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10

Hanquet, B., B. Tabyaoui, J. C. Caille, M. Farnier, and R. Guilard. "Synthèse stéréosélective de (±) boschnialactone, (±) 7-épiteucriumlactone et (±) 7-épiisoiridomyrmécine. Étude de la stéréochimie par spectroscopie de résonance magnétique nucléaire." Canadian Journal of Chemistry 68, no. 4 (1990): 620–27. http://dx.doi.org/10.1139/v90-095.

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The stereoselective syntheses of (±) boschnialactone 1, (±) 7-epiteucriumlactone 2, and (±) 7-epiisoiridomyrmecine 3 are described. Their preparation involved Stetter's reaction followed by nucleophilic addition of lithium enolates of suitable esters. Silylated reagents are used in the lactonisation step and the observed yields are between 63 and 78%. The proposed structural analysis is not in accord with the results of a previous study. The nuclear magnetic resonance data are determined using ID and 2D proton and carbon NMR experiments. Keywords: stereoselective synthesis, boschnialactone, 7-

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11

Tota, Arianna, Claudia Carlucci, Luisa Pisano, et al. "Synthesis of glycosyl sulfoximines by a highly chemo- and stereoselective NH- and O-transfer to thioglycosides." Organic & Biomolecular Chemistry 18, no. 20 (2020): 3893–97. http://dx.doi.org/10.1039/d0ob00647e.

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The first highly stereoselective sulfoximine formation directly from sulfides is achieved in the preparation of unprecedented glycosyl sulfoximines. X-ray analysis and a computational model establish the configuration at sulfur.

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12

Lanchote, Vera Lucia, Adriana Rocha, Flávio Ulliana Vieira de Albuquerque, Eduardo Barbosa Coelho, and Pierina Sueli Bonato. "Stereoselective analysis of fluvastatin in human plasma for pharmacokinetic studies." Journal of Chromatography B: Biomedical Sciences and Applications 765, no. 1 (2001): 81–88. http://dx.doi.org/10.1016/s0378-4347(01)00407-8.

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13

Balducci, Daniele, Andrea Bottoni, Matteo Calvaresi, Gianni Porzi, and Sergio Sandri. "Stereoselective synthesis and conformational analysis of pseudo-heptapeptides: Part 5." Tetrahedron: Asymmetry 18, no. 12 (2007): 1448–56. http://dx.doi.org/10.1016/j.tetasy.2007.06.016.

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14

Almiento, Giosuè M., Daniele Balducci, Andrea Bottoni, Matteo Calvaresi, and Gianni Porzi. "Stereoselective synthesis and conformational analysis of unnatural tetrapeptides. Part 2." Tetrahedron: Asymmetry 18, no. 22 (2007): 2695–711. http://dx.doi.org/10.1016/j.tetasy.2007.10.038.

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15

Konda, A., M. Soma, T. Ito, et al. "Stereoselective Analysis of Ritodrine Diastereomers in Human Serum Using HPLC." Journal of Chromatographic Science 48, no. 6 (2010): 503–6. http://dx.doi.org/10.1093/chromsci/48.6.503.

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16

Xu, Hongmei, Katarzyna K. Loboz, Annette S. Gross, and Andrew J. McLachlan. "Stereoselective analysis of hydroxybupropion and application to drug interaction studies." Chirality 19, no. 3 (2007): 163–70. http://dx.doi.org/10.1002/chir.20356.

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17

Volosov, Andrew, Amnon Sintov, and Meir Bialer. "Stereoselective Pharmacokinetic Analysis of the Antiepileptic 10-Hydroxycarbazepine in Dogs." Therapeutic Drug Monitoring 21, no. 2 (1999): 219–23. http://dx.doi.org/10.1097/00007691-199904000-00013.

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18

Ferreira, J. Tercio B., Edward G. Neeland, James P. Ounsworth, and Larry Weiler. "The stereoselective alkylation and conformational analysis of 14-membered lactones." Canadian Journal of Chemistry 65, no. 9 (1987): 2314–15. http://dx.doi.org/10.1139/v87-385.

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The 14-membered lactone, 13-tetradecanolide, can be alkylated to give mainly the 2R*, 13S*-dimethyltridecanolide. A second alkylation gives the 2,2-dimethyl lactone. The conformation of the starting material and alkylation products exist in the regular [3434] conformation. This model is used to rationalize the stereochemical outcome of the reaction and suggest the conformation of the intermediate enolate.

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19

Minami, R., N. Inotsume, C. Nakamura, and M. Nakano. "Stereoselective analysis of the disposition of tosufloxacin enantiomers in man." European Journal of Clinical Pharmacology 45, no. 5 (1993): 489–91. http://dx.doi.org/10.1007/bf00315523.

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20

Belinzoni, Diego U., Oreste A. Mascaretti, Pedro M. Alzari, Graciela Punte, Carlos Faerman, and Alberto Podjarny. "Stereoselective synthesis and X-ray crystallographic analysis of mixed 6,6-dihalo penicillanates." Canadian Journal of Chemistry 63, no. 11 (1985): 3177–81. http://dx.doi.org/10.1139/v85-525.

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The pivaloyloxy methyl 6,6-dihalo penicillanates 1a, 1b, and 1c have been stereoselectively prepared from the reaction of pivaloyloxy methyl 6-diazo penicillanate 2 with either N-halosuccinimide/halide or the interhalogens Xl (X = Cl, Br). The crystal structures of 3S,5R,6R pivaloyloxy methyl 6-bromo, 6-chloro penicillanate1a; 3S,5R,6R pivaloyloxy methyl 6-iodo, 6-bromo penicillanate 1b, and 3S, 5R, 6R pivaloyloxymethyl 6-iodo, 6-chloro penicillanate 1c have been determined by X-ray single crystal analysis. The stereochemistry of the displacement reaction is discussed.

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21

Petrie, Bruce, Maria Dolores Camacho Muñoz, and Julia Martín. "Stereoselective LC–MS/MS methodologies for environmental analysis of chiral pesticides." TrAC Trends in Analytical Chemistry 110 (January 2019): 249–58. http://dx.doi.org/10.1016/j.trac.2018.11.010.

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22

Wang, Lipeng, Markos Leggas, Philip E. Empey, and Patrick J. McNamara. "Stereoselective Interaction of Pantoprazole with ABCG2. II. In Vitro Flux Analysis." Drug Metabolism and Disposition 40, no. 5 (2012): 1024–31. http://dx.doi.org/10.1124/dmd.111.041616.

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23

GRAHAM, R. J., and L. WEILER. "ChemInform Abstract: The Stereoselective Alkylation and Conformational Analysis of 15-Hexadecanolide." ChemInform 22, no. 51 (2010): no. http://dx.doi.org/10.1002/chin.199151234.

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24

Spracklin, Douglas K., and Larry Weiler. "The stereoselective reduction and conformational analysis of 11-oxo-13-tetradecanolide." Journal of the Chemical Society, Chemical Communications, no. 18 (1992): 1347. http://dx.doi.org/10.1039/c39920001347.

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25

Polcaro, Chiara M., Carolina Marra, Claudia Desiderio, and Salvatore Fanali. "Stereoselective analysis of acid herbicides in natural waters by capillary electrophoresis." Electrophoresis 20, no. 12 (1999): 2420–24. http://dx.doi.org/10.1002/(sici)1522-2683(19990801)20:12<2420::aid-elps2420>3.0.co;2-p.

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26

Hong, Song, Yan Lu, Masao Morita, et al. "Stereoselective Synthesis of Maresin-Like Lipid Mediators." Synlett 30, no. 03 (2019): 343–47. http://dx.doi.org/10.1055/s-0037-1612011.

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14S,22-Dihydroxy-docosa-4Z,7Z,10Z,12E,16Z,19Z-hexaenoic acid (maresin-L1) and 14R,22-dihydroxy-docosa-4Z,7Z,10Z, 12E,16Z,19Z-hexaenoic acid (maresin-L2) were chemically synthesized. They were identical to activated macrophage-produced counterparts and their total synthesis was highly stereoselective, as revealed by chiral LC-UV-MS/MS analysis. The synthesis involved the following steps: (1) kinetic resolution of a racemic allylic alcohol by the asymmetric epoxidation; (2) transformation of the epoxy alcohol to γ-hydroxyenal derivative; and (3) the Wittig reaction to furnish the Z-olefin.

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27

Yamashita, Yu, Yoichi Hirano, Akiomi Takada, Hiroshi Takikawa, and Keisuke Suzuki. "Total Synthesis of Bis-anthraquinone Antibiotic BE-43472B." Synthesis 50, no. 13 (2018): 2490–515. http://dx.doi.org/10.1055/s-0037-1610136.

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This is a full account of our synthetic endeavor on the total synthesis of bis-anthraquinone antibiotic BE-43472B, an unusual octacyclic aromatic polyketide with a bis-anthraquinone scaffold. Three key steps enabled a facile access to the anthraquinone unit corresponding to the ABCF rings; (1) cyclo-condensation or -addition of benzonitrile oxides with cyclic enone derivatives, (2) benzoin cyclization for the stereoselective ring fusion with an angular hydroxy group, and (3) pinacol rearrangement for stereoselective installation of the angular aryl group. Other keys for the success include, (4

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28

García-Cansino, Laura, María Ángeles García, and María Luisa Marina. "Simultaneous Enantiomeric Separation of Carfentrazone-Ethyl Herbicide and Its Hydrolysis Metabolite Carfentrazone by Cyclodextrin Electrokinetic Chromatography. Analysis of Agrochemical Products and a Degradation Study." Molecules 26, no. 17 (2021): 5350. http://dx.doi.org/10.3390/molecules26175350.

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The different activity and toxicity that the enantiomers of agrochemicals may have requires the development of stereoselective analytical methodologies enabling the individual determination of each enantiomer. The aim of this work was to develop the first Electrokinetic Chromatography methodology enabling the simultaneous enantiomeric separation of carfentrazone-ethyl herbicide and its hydrolysis metabolite carfentrazone. The use of an anionic cyclodextrin as chiral selector (captisol at 2.5% (w/v)) in a 25 mM acetate buffer, at a temperature of 30 °C, and an applied voltage (reverse polarity)

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29

Stefaowitz, Janine, Dirk Schepmann, Constantin Daniliuc, Susumu Saito, and Bernhard Wünsch. "Synthesis of morphan derivatives with additional substituents in 8-position." Zeitschrift für Naturforschung B 71, no. 10 (2016): 1057–69. http://dx.doi.org/10.1515/znb-2016-0129.

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AbstractThe morphan system (2-azabicyclo[3.3.1]nonane) as a substructure of morphine is of major interest in medicinal chemistry. Herein, the synthesis of morphan derivatives with additional substituents at the propano bridge is reported. In order to avoid the isolation of the smelly and volatile nitrile 6 and the very polar primary amine 9, an efficient one-pot, three-step sequential transformation of the mesylate 5 into amides 10 was developed. The key step of the synthesis was the stereoselective intramolecular opening of the epoxides 11a–d leading to the exo-configured 8-hydroxymorphans 12

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30

Bringmann, Gerhard, Andreas Wuzik, Olaf Schupp, Karl Peters, and Eva-Maria Peters. "1,3-Di-terf-butyl-6H-benzo[b]naphtho[1,2-d]pyran-6-thione, a Severely Helically Distorted Thionolactone-Bridged Biaryl." Zeitschrift für Naturforschung B 52, no. 3 (1997): 355–58. http://dx.doi.org/10.1515/znb-1997-0310.

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Abstract The title compound 2c, a potentially useful synthetic intermediate in stereoselective biaryl synthesis, has been prepared from the oxolactone 1c, by treatment with Lawesson′s reagent. An X-ray structure analysis reveals its strongly helically distorted structure, the overall molecular distortion even slightly exceeding that of the corresponding oxo compound 1c.

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31

Singh, N. N., F. Jamali, F. M. Pasutto, R. T. Coutts, and A. S. Russell. "Stereoselective gas chromatographic analysis of etodolac enantiomers in human plasma and urine." Journal of Chromatography B: Biomedical Sciences and Applications 382 (January 1986): 331–37. http://dx.doi.org/10.1016/s0378-4347(00)83539-2.

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32

Shibukawa, A., Y. Kuroda, and T. Nakagawa. "High-performance capillary electrophoresis/frontal analysis for stereoselective drug-protein binding study." Analusis 26, no. 5 (1998): 39–40. http://dx.doi.org/10.1051/analusis:199826050039.

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33

Yabui, Akihiro, Mitsuji Yamashita, Tatsuo Oshikawa, Tadashi Hanaya, and Hiroshi Yamamoto. "Novel Stereoselective Preparation and Conformational Analysis of Furanose-Type Phosphono SugarC-Glycosides." Chemistry Letters 22, no. 1 (1993): 93–96. http://dx.doi.org/10.1246/cl.1993.93.

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34

Bibi, David, Bella Shusterman, Alessio Nocentini, Claudiu T. Supuran, and Meir Bialer. "Stereoselective pharmacokinetic and pharmacodynamic analysis of a CNS-active sulphamoylphenyl carbamate derivative." Journal of Enzyme Inhibition and Medicinal Chemistry 34, no. 1 (2019): 1078–82. http://dx.doi.org/10.1080/14756366.2019.1612887.

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35

Hayball, Peter J., Julie G. Tamblyn, Yvonne Holden, and Jan Wrobel. "Stereoselective analysis of ketorolac in human plasma by high-performance liquid chromatography." Chirality 5, no. 1 (1993): 31–35. http://dx.doi.org/10.1002/chir.530050107.

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36

Hu, Thomas Q., Chung-Li Lee, Brian R. James, and Steven J. Rettig. "Stereoselective hydrogenation of lignin degradation model compounds." Canadian Journal of Chemistry 75, no. 9 (1997): 1234–39. http://dx.doi.org/10.1139/v97-149.

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Di-µ-chloro-bis(η4-1,5-hexadiene)dirhodium(I) in a two-phase hexane–aqueous medium catalyzes the diastereoselective H2-hydrogenation of lignin degradation model compounds 4-propylphenol, 2-methoxy-4-propylphenol, and 2,6-dimethoxy-4-propylphenol. The all-cis diastereomer is obtained selectively when the phenolic hydroxy group is protected as a methyl ether or when a model compound possessing two methoxy substituents adjacent to the phenolic hydroxy group is used. The relative stereochemistries of the hydrogenated products are established by X-ray crystal structure analysis and (or) 1H NMR. Key

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37

Bonato, Pierina Sueli. "Research Spotlight: Stereoselective analysis of drugs and metabolites by the Chromatographic and Electrophoretic Analysis Center group." Bioanalysis 2, no. 2 (2010): 175–79. http://dx.doi.org/10.4155/bio.09.161.

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38

Gassmann, J., J. Voss, and G. Adiwidjaja. "Electroreduction of Organic Compounds, 25 Electrochemical Dehalogenation of Chlorinated Insecticides." Zeitschrift für Naturforschung B 50, no. 6 (1995): 953–58. http://dx.doi.org/10.1515/znb-1995-0618.

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Partial but regio- and stereoselective dechlorination takes place if polychlorinated oligocyclic insecticides (Diels-Alder adducts and dimers of hexachlorocyclopentadiene) are electrolysed in methanol solution at lead cathodes. The products are detected and identified by GC/MS, IR and NMR spectroscopy. The structure of the product 2 formed from Mirex® is confirmed by an X-ray structural analysis.

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39

McErlane, K. M., L. Igwemezie, and C. R. Kerr. "Stereoselective analysis of the enantiomers of mexiletine by high-performance liquid chromatography using fluorescence detection and study of their stereoselective disposition in man." Journal of Chromatography B: Biomedical Sciences and Applications 415 (January 1987): 335–46. http://dx.doi.org/10.1016/s0378-4347(00)83225-9.

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40

Wang, Xiaowen, and Su Zeng. "Stereoselective Metabolic and Pharmacokinetic Analysis of the Chiral Active Components from Herbal Medicines." Current Pharmaceutical Analysis 6, no. 1 (2010): 39–52. http://dx.doi.org/10.2174/157341210790780221.

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41

Barel, Shimon, Boris Yagen, Volker Schurig, et al. "Stereoselective pharmacokinetic analysis of valnoctamide in healthy subjects and in patients with epilepsy*." Clinical Pharmacology & Therapeutics 61, no. 4 (1997): 442–49. http://dx.doi.org/10.1016/s0009-9236(97)90194-6.

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42

Fuchs, Sabine, Thomas Beck, Stefan Burkardt, Martin Sandvoss, and Armin Mosandl. "Biogenetic Studies inMentha×piperita. 1. Deuterium-Labeled Monoterpene Ketones: Synthesis and Stereoselective Analysis." Journal of Agricultural and Food Chemistry 47, no. 8 (1999): 3053–57. http://dx.doi.org/10.1021/jf990132f.

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43

Neeland, Edward G., James P. Ounsworth, Russel J. Sims, and Larry Weiler. "Synthesis, Conformational Analysis, and Stereoselective Reduction of 14-Membered Ring 3-Keto Lactones." Journal of Organic Chemistry 59, no. 24 (1994): 7383–94. http://dx.doi.org/10.1021/jo00103a034.

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44

Chambers, Sarah J., Graeme Coulthard, William P. Unsworth, Peter O'Brien, and Richard J. K. Taylor. "From Heteroaromatic Acids and Imines to Azaspirocycles: Stereoselective Synthesis and 3D Shape Analysis." Chemistry - A European Journal 22, no. 19 (2016): 6496–500. http://dx.doi.org/10.1002/chem.201600823.

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45

SPRACKLIN, D. K., and L. WEILER. "ChemInform Abstract: The Stereoselective Reduction and Conformational Analysis of 11-Oxo-13- tetradecanolide." ChemInform 23, no. 51 (1992): no. http://dx.doi.org/10.1002/chin.199251213.

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46

Maurin, J. K., Z. Czarnocki, K. Wieteska, and W. Wierzchowski. "X-ray analysis as the important tool in controlling stereoselective synthesis of drugs." Acta Crystallographica Section A Foundations of Crystallography 61, a1 (2005): c280. http://dx.doi.org/10.1107/s0108767305088070.

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47

Matsushima, Kazumi, Toshiaki Nagai, and Shigetaro Kamiyama. "Optical Isomer Analysis of 3,4-Methylenedioxyamphetamine Analogues and their Stereoselective Disposition in Rats." Journal of Analytical Toxicology 22, no. 1 (1998): 33–39. http://dx.doi.org/10.1093/jat/22.1.33.

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48

Mahyaria, Amir Tofangchi, Nahid Shajari, Ali Reza Kazemizadeh, Katarzyna Ślepokura, Tadeusz Lis, and Ali Ramazani. "Regio- And Stereoselective Addition Of Imides To Ethyl 3-Phenyl-2- Propynoate In The Presence Of Triphenylphosphine. Single Crystal X-Ray Structure Of Ethyl (Z)-2-(1,3-Dioxo-1,3,3A,4,7,7A-Hexahydro-2H-Isoindol- 2-Yl)-3-Phenyl-2-Propenoate." Zeitschrift für Naturforschung B 62, no. 6 (2007): 829–34. http://dx.doi.org/10.1515/znb-2007-0612.

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A one-pot synthesis of sterically congested N-vinyl imides in fairly high yields by the reaction of ethyl 3-phenyl-2-propynoate, imides and triphenylphosphine is reported. The structures of these compounds were confirmed by IR, 1H, and 13C NMR spectroscopy, and by a single crystal X-ray structure determination. The structural analysis of the products indicated that the reaction is regioand stereoselective

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49

Noshiranzadeh, Nader, Ali Ramazani, Amir Tofangchi Mahyaria, Katarzyna Ślepokurab, and Tadeusz Lisb. "Stereoselective Synthesis and Single Crystal X-Ray Structures of Some Sterically Congested Electron-poor N-Vinyl Pyrazole Derivatives." Zeitschrift für Naturforschung B 63, no. 1 (2008): 65–70. http://dx.doi.org/10.1515/znb-2008-0109.

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A one-pot synthesis of sterically congested electron-poor N-vinyl pyrazoles in fairly good yields by the reaction of ethyl 3-phenyl-2-propynoate, pyrazoles and triphenylphosphine is reported. The structures of these compounds were confirmed by IR, 1H, and 13C NMR spectroscopy, and single crystal X-ray structure determination. The structural analysis of the products indicated that the reaction is completely regio- and stereoselective.

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50

Ramazani, Ali, Ali Morsali, Bijan Ganjeie, et al. "Stereoselective Syntheses of Alkyl Z-2-(2-amino-4-oxo-1,3-selenazol- 5(4H)-ylidene)acetates in Solvent-Free Conditions, X-Ray Single Crystal Structure Analysis of Ethyl Z-2-(2-amino-4-oxo-1,3-selenazol- 5(4H)-ylidene)acetate." Zeitschrift für Naturforschung B 60, no. 5 (2005): 569–71. http://dx.doi.org/10.1515/znb-2005-0516.

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Abstract:

Selenourea reacts with dialkyl acetylenedicarboxylates under solvent-free conditions to form 1:1 adducts, which undergo a cyclization reaction to produce alkyl Z-2-(2-amino-4-oxo-1,3-selenazol- 5(4H)-ylidene)acetates, in good yields. The stereochemistry of the ethyl Z-2-(2-amino-4-oxo-1,3- selenazol-5(4H)-ylidene)acetate was established by X-ray single crystal structure analysis. The reaction is completely stereoselective.

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