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Shcherbakova EG, James TD, Anzenbacher P. High-throughput assay for determining enantiomeric excess of chiral diols, amino alcohols, and amines and for direct asymmetric reaction screening. Nat Protoc 2020; 15:2203-2229. [DOI: 10.1038/s41596-020-0329-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2017] [Accepted: 04/14/2020] [Indexed: 11/09/2022]
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Shcherbakova EG, Brega V, Lynch VM, James TD, Anzenbacher P. High-Throughput Assay for Enantiomeric Excess Determination in 1,2- and 1,3-Diols and Direct Asymmetric Reaction Screening. Chemistry 2017; 23:10222-10229. [PMID: 28543938 DOI: 10.1002/chem.201701923] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2017] [Indexed: 11/12/2022]
Abstract
A simple and efficient method for determination of the yield, enantiomeric/diasteriomeric excess (ee/de), and absolute configuration of crude chiral diols without the need of work-up and product isolation in a high throughput setting is described. This approach utilizes a self-assembled iminoboronate ester formed as a product by dynamic covalent self-assembly of a chiral diol with an enantiopure fluorescent amine such as tryptophan methyl ester or tryptophanol and 2-formylphenylboronic acid. The resulting diastereomeric boronates display different photophysical properties and allow for fluorescence-based ee determination of molecules containing a 1,2- or 1,3-diol moiety. This method has been utilized for the screening of ee in a number of chiral diols including atorvastatin, a statin used for the treatment of hypercholesterolemia. Noyori asymmetric hydrogenation of benzil was performed in a highly parallel fashion with errors <1 % ee confirming the feasibility of the systematic examination of crude products from the parallel asymmetric synthesis in real time and in a high-throughput screening (HTS) fashion.
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Affiliation(s)
- Elena G Shcherbakova
- Department of Chemistry, Bowling Green State University, Bowling Green, OH, 43403, USA
| | - Valentina Brega
- Department of Chemistry, Bowling Green State University, Bowling Green, OH, 43403, USA
| | - Vincent M Lynch
- Department of Chemistry, University of Texas at Austin, Austin, TX, 78712, USA
| | - Tony D James
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK
| | - Pavel Anzenbacher
- Department of Chemistry, Bowling Green State University, Bowling Green, OH, 43403, USA
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Ion AE, Cristian L, Voicescu M, Bangesh M, Madalan AM, Bala D, Mihailciuc C, Nica S. Synthesis and properties of fluorescent 4'-azulenyl-functionalized 2,2':6',2″-terpyridines. Beilstein J Org Chem 2016; 12:1812-1825. [PMID: 27829888 PMCID: PMC5082674 DOI: 10.3762/bjoc.12.171] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Accepted: 07/21/2016] [Indexed: 11/23/2022] Open
Abstract
4′-Azulenyl-substituted terpyridines were efficiently synthesized following the Kröhnke methodology via azulenylchalcone intermediates. These azulenyl-containing terpyridines showed fluorescent emission with a fluorescence quantum yield varying from 0.14, in the case of parent terpyridine, to 0.64 when methyl groups are grafted on the azulenyl seven-membered ring. According to the crystal structures and TDDFT calculations, different twisting of the aromatic constituents is responsible for the observed fluorescent behavior. The electrochemical profile contains one-electron oxidation/reduction steps, which can only be explained on the basis of the redox behavior of the azulene unit. The ability of the 4′-azulenyl 2,2′:6′,2″-terpyridine to bind poisoning metal cations was studied by UV–vis titrations using aqueous solutions of Hg(II) and Cd(II) chlorides as illustrative examples.
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Affiliation(s)
- Adrian E Ion
- "C. D. Nenitzescu" Institute of Organic Chemistry of the Romanian Academy, 202 B Splaiul Independentei, 060023, Bucharest, Romania; Inorganic Chemistry Laboratory, Faculty of Chemistry, University of Bucharest, Str. Dumbrava Rosie, 020464, Bucharest, Romania
| | - Liliana Cristian
- "C. D. Nenitzescu" Institute of Organic Chemistry of the Romanian Academy, 202 B Splaiul Independentei, 060023, Bucharest, Romania; Department of Organic Chemistry, Biochemistry and Catalysis, Faculty of Chemistry, University of Bucharest, Bd. Regina Elisabeta 4-12, Bucharest 030016, Romania
| | - Mariana Voicescu
- "Ilie Murgulescu" Institute of Physical Chemistry of the Romanian Academy, Splaiul Independentei 202, 060021, Bucharest, Romania
| | - Masroor Bangesh
- Department of Chemistry, Hazara University, Mansehra 21120, Pakistan
| | - Augustin M Madalan
- Inorganic Chemistry Laboratory, Faculty of Chemistry, University of Bucharest, Str. Dumbrava Rosie, 020464, Bucharest, Romania
| | - Daniela Bala
- Physical Chemistry Department, Faculty of Chemistry, University of Bucharest, Regina Elisabeta, no. 4-12, 030018, Bucharest, Romania
| | - Constantin Mihailciuc
- Physical Chemistry Department, Faculty of Chemistry, University of Bucharest, Regina Elisabeta, no. 4-12, 030018, Bucharest, Romania
| | - Simona Nica
- "C. D. Nenitzescu" Institute of Organic Chemistry of the Romanian Academy, 202 B Splaiul Independentei, 060023, Bucharest, Romania
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