- Co (II) and Zn (II) metal complexes of heterocyclic Schiff bases: A synthesis, spectral and antimicrobial study
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The Schiff bases have been synthesised by the reaction of Benzoinoxime primary ligand with heterocyclic compounds such as 2-aminothiazole (SL1) and 8-hydroxyquinoline (SL2) to form the secondary ligand, which than react with the metal halides to form complexes of Co (II) and Zn (II). The elemental analysis data shows that the metal to ligand ratio in all Co (II) simple is 1:2 for simple complexes and 1:2:2 for metal complex with oxime as a primary ligand and SL1as a secondary ligand while it is 1:2:1 for metal complex with oxime as a primary ligand and SL3 as a secondary ligand whereas Zn (II) complexes of mixed ligand exhibit the stoichiometry 1:2:2. The structural features have been determined from IR, UV-Vis, and XRD data. All the complex shows a distorted octahedral geometry to mononuclear Co (II) complexes of mixed ligands, while square planner geometry to mononuclear Co (II) complexes of oximes. Zn (II) complexes of mixed ligands shows a distorted octahedral geometry, while square planner geometry to mononuclear Zn (II) complexes of oximes. All the synthesised compounds were screened for antimicrobial activity.
- Joshi, Sachin R.,Habib, Seema I.
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- Chiral morphine quinoline compound preparation method and chiral amino acid preparation method of compound
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The invention provides chiral morpholine compounds. The structural general formula of the chiral morpholine compounds is as shown in the description. The invention further comprises a preparation method of the chiral morpholine compounds. The chiral morpholine compounds are prepared by using benzoin as a starting material, performing reductive amination, and performing chemical resolution on enantiomers and acid-catalyzed ester condensation reaction. The invention further provides amino acid compounds prepared from the chiral morpholine compounds, and a preparation method and application of the amino acid compounds.
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Paragraph 0105; 0107-0109
(2017/12/13)
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- Readily available ruthenium complex for efficient dynamic kinetic resolution of aromatic α-hydroxy ketones
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A ruthenium complex formed from commercially available [Ru(p-cymene)Cl 2]2 and 1,4-bis(diphenylphosphino)butane catalyzes the racemization of aromatic α-hydroxy ketones very efficiently at room temperature. The racemization is fully compatible with a kinetic resolution catalyzed by a lipase from Pseudomonas stutzeri. This is the first example of dynamic kinetic resolution of α-hydroxy ketones at ambient temperature in which the metal and enzyme catalysts work in concert in one pot at room temperature to give quantitative yields of esters of α-hydroxy ketones with very high enantioselectivity.
- Agrawal, Santosh,Martinez-Castro, Elisa,Marcos, Rocio,Martin-Matute, Belen
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p. 2256 - 2259
(2014/05/06)
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- Solution-phase synthesis and evaluation of tetraproline chiral stationary phases
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A protocol was developed for the solution-phase synthesis of multigram amounts of two 9-fluorenylmethoxycarbonyl (Fmoc)-protected tetraproline peptides. These tetraproline peptides were then attached to amino derivatized silica gel. The replacement of the Fmoc group with the trimethylacetyl group lead to two tetraproline chiral stationary phases (CSPs). A comparison of the chromatographic behavior of these two solution-phase-synthesized tetraproline CSPs with that prepared by stepwise solid-phase synthesis revealed that all three had similar chromatographic performance for resolving 53 model analytes. This suggests that the solution-phase synthesis of oligoprolines, which allows for the specific benefits of good batch reproducibility, selector homogeneity, and possibly low cost, is a feasible alternative to the solid-phase synthesis of oligoproline CSPs. Copyright
- Dai, Zhi,Ye, Guozhong,Pittman Jr., Charles U.,Li, Tingyu
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experimental part
p. 329 - 338
(2012/05/20)
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- Optical resolution of fragrant lactones
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Optical resolution of six chiral fragrant lactones (δ-jasmine lactone, massoia lactone, tuberolactone, pentynyllactone, δ-decalactone, and γ- nonalactone) was investigated by means of either the diastereomeric salt formation method or the diastereomeric amide formation method. Using these procedures, we obtained each enantiomer from five of the six lactones, except for massoia lactone. All five lactones were obtained in a good yield and with high optical purity. Sensoric characteristics on both enantiomers and racemic modification of four lactones are given.
- Nohira, Hiroyuki,Mizuguchi, Keiko,Murata, Toru,Yazaki, Yuko,Kanazawa, Miho,Aoki, Yoshio,Nohira, Misako
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p. 1359 - 1370
(2007/10/03)
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- Lipase TL-mediated kinetic resolution of benzoin: Facile synthesis of (1R,2S)-erythro-2-amino-1,2-diphenylethanol
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The lipase TL-mediated kinetic resolution of (±)-benzoin (1) proceeded to give the corresponding optically pure benzoin (R)-1. On the other hand, (S)-benzoin-O-acetate (5) could be hydrolyzed without epimerization to give (S)-benzoin (S)-1, under alkaline conditions. Further, (R)-1 was converted to (1R,2S)-2-amino-1,2-diphenylethanol (99:1 er) according to the procedure reported previously. (C) 2000 Elsevier Science Ltd.
- Aoyagi, Yutaka,Agata, Naoki,Shibata, Noriko,Horiguchi, Mai,Williams, Robert M.
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p. 10159 - 10162
(2007/10/03)
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