1
|
Marsico G, Calice U, Scafato P, Belviso S, Evidente A, Superchi S. Computational Approaches and Use of Chiroptical Probes in the Absolute Configuration Assignment to Natural Products by ECD Spectroscopy: A 1,2,3-Trihydroxy-p-menthane as a Case Study. Biomolecules 2022; 12:biom12030421. [PMID: 35327613 PMCID: PMC8945943 DOI: 10.3390/biom12030421] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 03/02/2022] [Accepted: 03/06/2022] [Indexed: 12/13/2022] Open
Abstract
In this study, the computational analysis of electronic circular dichroism (ECD) spectra and the employment of biphenyl chiroptical probes were compared in the absolute configuration assignment of (-)-1α,2α,3β-trihydroxy-p-menthane (1), taken as a representative example of a UV-transparent chiral natural product. The usefulness of chiroptical probes in the configurational assignments of natural products and their complementarity to the computational protocols is herein highlighted. The biphenyl probe approach proves to be straightforward, reliable, and suitable for conformationally mobile and ECD silent compounds, not treatable by computational analysis of chiroptical data.
Collapse
Affiliation(s)
- Giulia Marsico
- Department of Sciences, University of Basilicata, Via dell’Ateneo Lucano 10, 85100 Potenza, Italy; (G.M.); (U.C.); (P.S.); (S.B.)
| | - Umberto Calice
- Department of Sciences, University of Basilicata, Via dell’Ateneo Lucano 10, 85100 Potenza, Italy; (G.M.); (U.C.); (P.S.); (S.B.)
| | - Patrizia Scafato
- Department of Sciences, University of Basilicata, Via dell’Ateneo Lucano 10, 85100 Potenza, Italy; (G.M.); (U.C.); (P.S.); (S.B.)
| | - Sandra Belviso
- Department of Sciences, University of Basilicata, Via dell’Ateneo Lucano 10, 85100 Potenza, Italy; (G.M.); (U.C.); (P.S.); (S.B.)
| | - Antonio Evidente
- Department of Chemical Sciences, University of Naples “Federico II”, Complesso Universitario Monte Sant’Angelo, Via Cintia 4, 80126 Napoli, Italy;
| | - Stefano Superchi
- Department of Sciences, University of Basilicata, Via dell’Ateneo Lucano 10, 85100 Potenza, Italy; (G.M.); (U.C.); (P.S.); (S.B.)
- Correspondence: ; Tel.: +39-0971206098
| |
Collapse
|
2
|
Masi M, Santoro E, Clement S, Meyer S, Scafato P, Superchi S, Evidente A. Further secondary metabolites produced by the fungus
Pyricularia grisea
isolated from buffelgrass (
Cenchrus ciliaris
). Chirality 2020; 32:1234-1242. [DOI: 10.1002/chir.23270] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 07/05/2020] [Accepted: 07/06/2020] [Indexed: 02/06/2023]
Affiliation(s)
- Marco Masi
- Dipartimento di Scienze Chimiche Università di Napoli Federico II, Complesso Universitario Monte S. Angelo Naples Italy
| | - Ernesto Santoro
- Dipartimento di Scienze Università della Basilicata Potenza Italy
| | - Suzette Clement
- Shrub Sciences Laboratory U.S. Forest Service Rocky Mountain Research Station Provo Utah USA
| | - Susan Meyer
- Shrub Sciences Laboratory U.S. Forest Service Rocky Mountain Research Station Provo Utah USA
| | - Patrizia Scafato
- Dipartimento di Scienze Università della Basilicata Potenza Italy
| | - Stefano Superchi
- Dipartimento di Scienze Università della Basilicata Potenza Italy
| | - Antonio Evidente
- Dipartimento di Scienze Chimiche Università di Napoli Federico II, Complesso Universitario Monte S. Angelo Naples Italy
| |
Collapse
|
3
|
Santoro E, Vergura S, Scafato P, Belviso S, Masi M, Evidente A, Superchi S. Absolute Configuration Assignment to Chiral Natural Products by Biphenyl Chiroptical Probes: The Case of the Phytotoxins Colletochlorin A and Agropyrenol. JOURNAL OF NATURAL PRODUCTS 2020; 83:1061-1068. [PMID: 32091903 PMCID: PMC7997626 DOI: 10.1021/acs.jnatprod.9b01068] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
The application of flexible biphenyls as chiroptical probes for the absolute configuration assignment to chiral natural products is described. The method is straightforward and reliable and can be applied to conformationally mobile and ECD silent compounds, not treatable by computational analysis of chiroptical data. By this approach, the (6'R) absolute configuration of the phytotoxin colletochlorin A (1) was confirmed, while the absolute configuration of the phytotoxin agropyrenol (2), previously assigned by the NMR Mosher method, was revised and assigned as (3'S,4'S). Moreover, with the biphenyl method the configurational assignment can be obtained simply by the sign of a diagnostic Cotton effect at 250 nm in the ECD spectrum, thus allowing application without the need of advanced knowledge of chiroptical spectroscopy and computational protocols.
Collapse
Affiliation(s)
- Ernesto Santoro
- Department
of Sciences, University of Basilicata, Viale dell’Ateneo Lucano
10, 85100 Potenza, Italy
| | - Stefania Vergura
- Department
of Sciences, University of Basilicata, Viale dell’Ateneo Lucano
10, 85100 Potenza, Italy
| | - Patrizia Scafato
- Department
of Sciences, University of Basilicata, Viale dell’Ateneo Lucano
10, 85100 Potenza, Italy
| | - Sandra Belviso
- Department
of Sciences, University of Basilicata, Viale dell’Ateneo Lucano
10, 85100 Potenza, Italy
| | - Marco Masi
- Department
of Chemical Sciences, University of Naples
Federico II, Complesso Universitario Monte San’Angelo, Via Cintia 4, 80126 Napoli, Italy
| | - Antonio Evidente
- Department
of Chemical Sciences, University of Naples
Federico II, Complesso Universitario Monte San’Angelo, Via Cintia 4, 80126 Napoli, Italy
| | - Stefano Superchi
- Department
of Sciences, University of Basilicata, Viale dell’Ateneo Lucano
10, 85100 Potenza, Italy
- Tel: +39-0971-20-6098. Fax: +39-0971-20-5678.
| |
Collapse
|
4
|
Torabi Kohlbouni S, Sarkar A, Zhang J, Li X, Borhan B. Absolute stereochemical determination of 1,2-diols via complexation with dinaphthyl borinic acid. Chirality 2020; 32:817-823. [PMID: 32201984 DOI: 10.1002/chir.23223] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 03/04/2020] [Accepted: 03/07/2020] [Indexed: 11/11/2022]
Abstract
Rapid derivatization of chiral 1,2-diols with dinaphthyl borinic acid (DBA) leads to a cyclic boronate, enabling the absolute stereochemical prediction via exciton-coupled circular dichroic (ECCD) of the naphthyl groups. Aryl- and alkyl-substituted 1,2-diols derivatized with DBA yield a predictable ECCD, which is also in agreement with theoretical predictions derived from computationally minimized structures.
Collapse
Affiliation(s)
| | - Aritra Sarkar
- Department of Chemistry, Michigan State University, East Lansing, Michigan, USA
| | - Jun Zhang
- Department of Chemistry, Michigan State University, East Lansing, Michigan, USA
| | - Xiaoyong Li
- Corteva Agriscience, Indianapolis, Indiana, USA
| | - Babak Borhan
- Department of Chemistry, Michigan State University, East Lansing, Michigan, USA
| |
Collapse
|
5
|
Padula D, Mazzeo G, Santoro E, Scafato P, Belviso S, Superchi S. Amplification of the chiroptical response of UV-transparent amines and alcohols by N-phthalimide derivatization enabling absolute configuration determination through ECD computational analysis. Org Biomol Chem 2020; 18:2094-2102. [PMID: 32107518 DOI: 10.1039/d0ob00052c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The stereoselective transformation of chiral UV-transparent amines and alcohols to phthalimides has proved to be a simple and efficient method to enhance the chiroptical response of these substrates allowing their reliable absolute configuration determination by computational analysis of ECD spectra. Such a transformation also leads to a significant reduction in the molecular conformational flexibility thus simplifying the conformational analysis required by the computational treatment. The method described herein thus allows the absolute configuration assignment to these challenging substrates to be much easier and reliable.
Collapse
Affiliation(s)
- Daniele Padula
- Dipartimento di Scienze, Università della Basilicata, via dell'Ateneo Lucano, 85100, Potenza, Italy.
| | | | | | | | | | | |
Collapse
|
6
|
Vergura S, Scafato P, Belviso S, Superchi S. Absolute Configuration Assignment from Optical Rotation Data by Means of Biphenyl Chiroptical Probes. Chemistry 2019; 25:5682-5690. [PMID: 30730078 DOI: 10.1002/chem.201806435] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2018] [Revised: 02/06/2019] [Indexed: 11/10/2022]
Abstract
A non-empirical approach for the assignment of the absolute configuration of chiral 2-alkyl-substituted carboxylic acids and primary amines by [α]D measurements has been developed. The method requires the conversion of the chiral acids or amines into the corresponding 4,4'-disubstituted biphenylamides or biphenylazepines, respectively. In these derivatives a central-to-axial chirality transfer induces a preferred torsion in the biphenyl moiety revealed by the sign of the biphenyl A band in the ECD spectrum. By 4,4'-substitution on the biphenyl moiety a redshift of the A band is obtained, leading to an increase of its relative contribution to optical rotation. This allows to reliably establish a direct correlation between the [α]D sign, the biphenyl twist and, then, the substrate absolute configuration. This approach thus constitutes a really practical and reliable method to assign the absolute configuration of chiral carboxylic acids and primary amines by simple and straightforward [α]D measurement, readily obtainable by a routine instrumentation like the polarimeter.
Collapse
Affiliation(s)
- Stefania Vergura
- Department of Science, Università degli Studi della Basilicata, Via dell'Ateneo Lucano, 10, 85100, Potenza, Italy
| | - Patrizia Scafato
- Department of Science, Università degli Studi della Basilicata, Via dell'Ateneo Lucano, 10, 85100, Potenza, Italy
| | - Sandra Belviso
- Department of Science, Università degli Studi della Basilicata, Via dell'Ateneo Lucano, 10, 85100, Potenza, Italy
| | - Stefano Superchi
- Department of Science, Università degli Studi della Basilicata, Via dell'Ateneo Lucano, 10, 85100, Potenza, Italy
| |
Collapse
|
7
|
Vergura S, Pisani L, Scafato P, Casarini D, Superchi S. Central-to-axial chirality induction in biphenyl chiroptical probes for the stereochemical characterization of chiral primary amines. Org Biomol Chem 2019; 16:555-565. [PMID: 29292442 DOI: 10.1039/c7ob02730c] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Flexible biphenyls have been applied as efficient and practical chiroptical probes for absolute configuration assignment to chiral primary amines. The mechanism of the central-to-axial chirality transfer from the amine moiety to the conformationally flexible biphenyl system has been determined by NMR and computational studies. This allowed proposing a general non-empirical rule in order to establish, simply by looking at the sign of the 250 nm A band in the ECD spectrum of the biphenyl derivative, the torsion of the biphenyl and thus the absolute configuration of the amine. The method proved to be very reliable and sensitive, allowing treatment of samples on the μmol scale and permitting the simultaneous determination of the amine sample's absolute configuration and enantiopurity.
Collapse
Affiliation(s)
- S Vergura
- Dipartimento di Scienze, Università della Basilicata, via dell'Ateneo Lucano 10, 85100, Potenza, Italy.
| | | | | | | | | |
Collapse
|
8
|
Marsico G, Pignataro BA, Masi M, Evidente A, Casella F, Zonno MC, Tak JH, Bloomquist JR, Superchi S, Scafato P. Asymmetric synthesis and structure-activity studies of the fungal metabolites colletorin A, colletochlorin A and their halogenates analogues. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.05.077] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
9
|
Pisani L, Bochicchio C, Superchi S, Scafato P. TroposAmino Alcohol Mediated Enantioselective Aryl Transfer Reactions to Aromatic Aldehydes. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402702] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
10
|
Li X, Burrell CE, Staples RJ, Borhan B. Absolute configuration for 1,n-glycols: a nonempirical approach to long-range stereochemical determination. J Am Chem Soc 2012; 134:9026-9. [PMID: 22540177 DOI: 10.1021/ja2119767] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The absolute configurations of 1,n-glycols (n = 2-12, 16) bearing two chiral centers were rapidly determined via exciton-coupled circular dichroism (ECCD) using a tris(pentafluorophenyl)porphyrin (TPFP porphyrin) tweezer system in a nonempirical fashion devoid of chemical derivatization. A unique "side-on" approach of the porphyrin tweezer relative to the diol guest molecule is suggested as the mode of complexation.
Collapse
Affiliation(s)
- Xiaoyong Li
- Department of Chemistry, Michigan State University, East Lansing, 48824, United States
| | | | | | | |
Collapse
|
11
|
Ferrarini A, Ferroni F, Pieraccini S, Rosini C, Superchi S, Spada GP. Central-to-axial chirality transfer revealed by liquid crystals: A combined experimental and computational approach for the determination of absolute configuration of carboxylic acids with an α chirality centre. Chirality 2011; 23:736-43. [DOI: 10.1002/chir.20969] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|