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Martins LMOS, Souto FT, Hoye TR, Alvarenga ES. Deciphering molecular structures: NMR spectroscopy and quantum mechanical insights of halogenated 4H-Chromenediones. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2024. [PMID: 38557999 DOI: 10.1002/mrc.5445] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 02/15/2024] [Accepted: 03/13/2024] [Indexed: 04/04/2024]
Abstract
Sesquiterpene lactones (SL) represent a class of secondary metabolites found in the Asteraceae family, notable for their unique structures. The SL α-santonin (1) and its derivatives are worthy of mention due to their diverse biological properties. Additionally, 4H-chromenes and 4H-chromones are appealing frameworks holding the capability to be used as structural motifs for new drugs. Furthermore, unambiguous structural elucidation is crucial for developing novel compounds for diverse applications. In this context, it is common to find in the literature molecules erroneously assigned. Therefore, the use of quantum mechanical calculations to simulate NMR chemical shifts has emerged as a valuable strategy. In this work, we conceived the synthesis of two halogenated 4H-chromenediones derived from photosantonic acid (2), a photoproduct arising from irradiation of α-santonin (1) in the ultraviolet region. The structure of the chlorinated and brominated products was determined by NMR analysis, with the aid of quantum mechanical calculations at the B3LYP/6-311 + G(2d,p)//M062x/6-31 + G(d,p) level of theory. All analyses were in agreement and led to the assignment of the brominated 4H-chromene-2,7-dione as (3S,3aS,5aR,9bS)-5a-(2-bromopropan-2-yl)-3-methyl-3,3a,5,5a,8,9b-hexahydro-4H-furo[2,3-f]chromene-2,7-dione (11b) and of the chlorinated 4H-chromene-2,7-dione as (3S,3aS,5aR,9bS)-5a-(2-chloropropan-2-yl)-3-methyl-3,3a,5,5a,8,9b-hexahydro-4H-furo[2,3-f]chromene-2,7-dione (12b). The diastereoselectivities of the reactions were explained based on products and intermediates formation energy calculated using B3LYP/6-31 + G(d,p) as the level of theory. Structures 11b and 12b were identified as the thermodynamic and kinetic products of the reaction among all candidates. Consequently, the strategy utilized in this study is robust and successfully illustrates the use of quantum mechanical calculations in the structural elucidation of new compounds with potential applications as novel drugs or products.
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Affiliation(s)
- Lucas M O S Martins
- Department of Chemistry, Universidade Federal de Viçosa, Viçosa, MG, Brazil
- Chemistry Institute, Universidade de São Paulo, São Paulo, SP, Brazil
| | | | - Thomas R Hoye
- Department of Chemistry, University of Minnesota, Minneapolis, MN, USA
| | - Elson S Alvarenga
- Department of Chemistry, Universidade Federal de Viçosa, Viçosa, MG, Brazil
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Zhou M, Zhou J, Peng X, Duan F, Gao Y, Meng X, Ruan H. Isomeric eremophilane lactones from the whole plant of Parasenecio albus and their cytotoxic and immunosuppressive activities. PHYTOCHEMISTRY 2023; 214:113821. [PMID: 37567352 DOI: 10.1016/j.phytochem.2023.113821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 08/03/2023] [Accepted: 08/07/2023] [Indexed: 08/13/2023]
Abstract
Ten previously unreported eremophilane lactones (parasalbolides A-J), including three pairs of C-10 epimers (parasalbolides A and G, B and H, and F and I, respectively), were isolated and identified from the whole plant of Parasenecio albus. Their structures were established on the basis of the HRESIMS and NMR spectroscopic analyses, combined with the comparison of the ECD spectra. The absolute configuration of parasalbolide A was confirmed by single-crystal X-ray diffraction using Cu Kα radiation. Parasalbolides A-J represent the first examples of 1,2,10-trioxygenated eremophila-7(11),8-dien-12,8-olides. The cytotoxic and immunosuppressive activities of selected isolates were evaluated and the (10S)-eremophilane lactones (parasalbolides A, B, and F) showed more potent activities than the (10R)-ones (parasalbolides G, H, and I).
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Affiliation(s)
- Ming Zhou
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China; Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, People's Republic of China
| | - Jia Zhou
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
| | - Xiaogang Peng
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
| | - Fangfang Duan
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
| | - Ying Gao
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
| | - Xianggao Meng
- College of Chemistry, Central China Normal University, Wuhan, 430079, People's Republic of China
| | - Hanli Ruan
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China.
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Teixeira MG, Alvarenga ES, Lopes DT, Oliveira DF. Herbicidal activity of isobenzofuranones and in silico identification of their enzyme target. PEST MANAGEMENT SCIENCE 2019; 75:3331-3339. [PMID: 31026360 DOI: 10.1002/ps.5456] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2019] [Revised: 03/23/2019] [Accepted: 04/26/2019] [Indexed: 06/09/2023]
Abstract
BACKGROUND Given the weed resistance to various herbicides with different mechanisms of action, the search for new compounds that are more effective and exhibit low levels of impact to other species in nature has been imperative in the field of the agriculture. For this purpose, 16 phthalides, and furan-2(5H)-one were synthetized and evaluated for their effectiveness as herbicides in seeds of Sorghum bicolor (sorghum), Cucumis sativus (cucumber), and Allium cepa (onion). Furthermore, a preliminary in silico study was carried out to identify the enzyme target of the most active compounds. RESULTS In the assays with S. bicolor, the mixture rac-(3aR,4R,5S,6S,7S,7aS)-5,6-dibromohexahydro-4,7-methanoisobenzofuran-1(3H)-one + rac-(3aR,4R,5R,6R,7S,7aS)-5,6-dibromohexahydro-4,7-methanoisobenzofuran-1(3H)-one (15a + 15b) showed comparable inhibitory activity to (S)-metolachlor, which was used as control herbicide at concentrations ranging from 50 μm to 1000 μm. The developments of the seeds evaluated were altered by all 17 compounds, either stimulating or inhibiting. The best results were presented by compounds 15a, and 15b, either in their pure form or as a mixture. CONCLUSION The results presented by 15a, and 15b were superior to the activity of the commercial herbicide (S)-metolachlor in the assays with C. sativus, and A. cepa. The in silico study provides strong evidence that the most active compounds bind to strigolactones esterases D14 through the same binding site of (5R)-5-hydroxy-3-methylfuran-2(5H)-one (H3M), which is one of the strigolactones (SLs) cleavage products. © 2019 Society of Chemical Industry.
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Affiliation(s)
- Milena G Teixeira
- Departament of Chemistry, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Elson S Alvarenga
- Departament of Chemistry, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Dayane T Lopes
- Departament of Chemistry, Universidade Federal de Viçosa, Viçosa, Brazil
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Alvarenga ES, Carneiro VM, Silva SA, Siqueira RP, Bressan GC. Synthesis of novel amides, characterization by spectrometric methods, cytotoxic activity and theoretical calculations. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2019.04.021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Wang J, Su S, Zhang S, Zhai S, Sheng R, Wu W, Guo R. Structure-activity relationship and synthetic methodologies of α-santonin derivatives with diverse bioactivities: A mini-review. Eur J Med Chem 2019; 175:215-233. [DOI: 10.1016/j.ejmech.2019.04.066] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Revised: 04/24/2019] [Accepted: 04/25/2019] [Indexed: 12/30/2022]
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Aguiar AR, Alvarenga ES, Silva EM, Farias ES, Picanço MC. Synthesis, insecticidal activity, and phytotoxicity of novel chiral amides. PEST MANAGEMENT SCIENCE 2019; 75:1689-1696. [PMID: 30520224 DOI: 10.1002/ps.5289] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Revised: 10/11/2018] [Accepted: 11/27/2018] [Indexed: 06/09/2023]
Abstract
BACKGROUND The lesser grain borer, Rhyzopertha dominica (F.) (Coleoptera: Bostrychidae), is an important pest of stored grains worldwide. Chemical control is the main method used to manage this pest, but the continuous use of insecticides can lead to the selection of resistant R. dominica strains. Thus, there is a constant demand for the development of new insecticide molecules. This study describes the synthesis of 14 chiral amides and evaluation of their insecticidal activity against R. dominica. Their phytotoxicity to wheat (Triticum sativum) seeds is also evaluated. RESULTS In the screening assay, compounds 8i and 8j caused 100% and 87% mortality of R. dominica. These values did not differ from the mortality caused by Bifenthrin® (75%). Amide 8i presented similar toxicity (LD50 = 27.98 µmol g-1 , CI95 = 25.14-30.71) and speed of action (LT50 = 22 h, CI95 = 19.34-24.66) to amide 8j (LD50 = 29.37 µmol g-1 , CI95 = 27.43-31.09, and LT50 = 19 h, CI95 = 17.05-20.95) against the pest. Both amides inhibited less than 44% of wheat growth. CONCLUSION Among the tested amides, only 8i and 8j were effective in R. dominica control and presented no considerable phytotoxicity towards wheat seeds. Therefore, these amides are promising as insecticides for the management of R. dominica. © 2018 Society of Chemical Industry.
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Affiliation(s)
- Alex R Aguiar
- Department of Chemistry, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Elson S Alvarenga
- Department of Chemistry, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Eliete Mp Silva
- Department of Entomology, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Elizeu S Farias
- Department of Entomology, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Marcelo C Picanço
- Department of Entomology, Universidade Federal de Viçosa, Viçosa, Brazil
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Sangi DP, Meira YG, Moreira NM, Lopes TA, Leite MP, Pereira-Flores ME, Alvarenga ES. Benzoxazoles as novel herbicidal agents. PEST MANAGEMENT SCIENCE 2019; 75:262-269. [PMID: 29885098 DOI: 10.1002/ps.5111] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 05/22/2018] [Accepted: 06/04/2018] [Indexed: 06/08/2023]
Abstract
BACKGROUND Despite the need to develop new herbicides with different modes of action, due to weed resistance, many important classes of compounds have been studied poorly for this purpose. Benzoxazoles are considered privileged structures because of their biological activities, but their phytotoxic activities have not received a lot of attention until now. RESULTS Double vinylic substitution reactions were carried out to furnish four 2-nitromethylbenzoxazoles and one oxazolidine. Benzoxazol-2-ylmethanamine was obtained by reduction of compound 3a. These compounds were evaluated for their phytotoxicity in Allium cepa (onion), Solanum lycopersicum (tomato), Cucumis sativus (cucumber) and Sorghum bicolor (sorghum). Comparison with oxazolidine analogue allowed us to understand that the benzoxazolic structure is very important for the herbicidal activity. CONCLUSION All the synthesized compounds exhibited biological activity on seed germination. The four 2-nitromethylbenzoxazoles showed phytotoxic activity and the 5-chloro-2-(nitromethyl)benzo[d]oxazole (3b) exhibited higher inhibition than the commercial herbicide against all four plant species tested. © 2018 Society of Chemical Industry.
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Affiliation(s)
- Diego P Sangi
- Chemistry Department, Universidade Federal Fluminense, Volta Redonda, Brazil
| | - Yuri G Meira
- Chemistry Department, Universidade Federal Fluminense, Volta Redonda, Brazil
| | - Natália M Moreira
- Chemistry Department, Universidade Federal Fluminense, Volta Redonda, Brazil
| | - Thais A Lopes
- Chemistry Department, Universidade Federal Fluminense, Volta Redonda, Brazil
| | - Mathias P Leite
- Chemistry Department, Universidade Federal Fluminense, Volta Redonda, Brazil
| | - Milton E Pereira-Flores
- Department of Agricultural and Environmental Engineering, Universidade Federal de Viçosa, Brazil
| | - Elson S Alvarenga
- Chemistry Department, Universidade Federal de Viçosa, Viçosa, Brazil
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Moraes F, Alvarenga E, Demuner A, Viana V. Assignment of the relative and absolute stereochemistry of two novel epoxides using NMR and DFT-GIAO calculations. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.03.050] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Sartori SK, Alvarenga ES, Franco CA, Ramos DS, Oliveira DF. One-pot synthesis of anilides, herbicidal activity and molecular docking study. PEST MANAGEMENT SCIENCE 2018; 74:1637-1645. [PMID: 29318774 DOI: 10.1002/ps.4855] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Revised: 12/24/2017] [Accepted: 01/04/2018] [Indexed: 06/07/2023]
Abstract
BACKGROUND In the context of the demand for more efficient herbicides, the aim of the present work was to synthesize anilides via simple methods, and evaluate their herbicidal activities through seed germination assays. In silico studies were carried out to identify the enzyme target sites in plants for the most active anilides. RESULTS A total of 18 anilides were prepared via one-pot reaction in yields that varied from 36 to 98% through reactions of anilines with sorbic chloride and hexanoic anhydride. According to seed germination assays in three dicotyledonous and one monocotyledonous plant species, the most active anilides showed root and shoot growth inhibition superior to that of Dual (S-metolachlor). In silico studies indicated that histone deacetylase was the probable enzyme target site in plants for these substances. The affinities of the most active anilides for the binding sites of this enzyme were equal to or higher than those calculated for its inhibitors. CONCLUSION Anilides 4d, 4e, 4 g, and 4 h are promising candidates for the development of novel herbicides. According to in silico studies, they inhibit histone deacetylase in plants, which can be exploited for the development of new weed control methods. © 2018 Society of Chemical Industry.
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Affiliation(s)
- Suélen K Sartori
- Chemistry Department, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | - Elson S Alvarenga
- Chemistry Department, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | - Cristiane A Franco
- Chemistry Department, Universidade Federal de Viçosa, Viçosa, MG, Brazil
| | - Danielle S Ramos
- Chemistry Department, Universidade Federal de Viçosa, Viçosa, MG, Brazil
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Application of clethodim pesticide water-based formulation prepared by 1-decyl-3-methyl imidazolium bromide aqueous solution. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.09.038] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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