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Vyhivskyi O, Baudoin O. Total Synthesis of the Diterpenes (+)-Randainin D and (+)-Barekoxide via Photoredox-Catalyzed Deoxygenative Allylation. J Am Chem Soc 2024; 146. [PMID: 38618944 PMCID: PMC11046436 DOI: 10.1021/jacs.4c02224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2024] [Revised: 03/30/2024] [Accepted: 04/02/2024] [Indexed: 04/16/2024]
Abstract
We report the first enantioselective total synthesis of diterpenoid randainin D, which possesses a hydroazulenone core with a β-substituted butenolide moiety on the cycloheptane ring. The trans-5/7 ring system was formed via a highly challenging ring-closing metathesis delivering the tetrasubstituted cycloheptenone. The butenolide moiety was installed via a novel deoxygenative allylation under Ir-photoredox catalysis, employing methyl oxalate as a red/ox tag. Moreover, the developed allylation was successfully utilized in the 7-step total synthesis of (+)-barekoxide. This study suggests that this deoxygenative allylation method is a promising strategy for the formation of Cq-C(sp3) bonds (Cq = quaternary center) in the context of natural product synthesis.
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Affiliation(s)
- Oleksandr Vyhivskyi
- Department of Chemistry, University
of Basel, St. Johanns-Ring
19, CH-4056 Basel, Switzerland
| | - Olivier Baudoin
- Department of Chemistry, University
of Basel, St. Johanns-Ring
19, CH-4056 Basel, Switzerland
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2
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Pu DB, Zhang XJ, Bi DW, Gao JB, Yang Y, Li XL, Lin J, Li XN, Zhang RH, Xiao WL. Callicarpins, Two Classes of Rearranged ent-Clerodane Diterpenoids from Callicarpa Plants Blocking NLRP3 Inflammasome-Induced Pyroptosis. JOURNAL OF NATURAL PRODUCTS 2020; 83:2191-2199. [PMID: 32628479 DOI: 10.1021/acs.jnatprod.0c00288] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Callicarpins A-D (1-4), possessing an unprecedented A-homoent-clerodane scaffold with a bicyclo[5.4.0]undecane ring system, and callicarpins E-G (5-7), with 5/6-fused ent-clerodane diterpenoid skeletons, were isolated from Callicarpaarborea and C. integerrim. Their structures were elucidated by comprehensive spectroscopic data, X-ray crystal diffraction, chemical derivatization, and electronic circular dichroism (ECD) data. Putative biosynthetic pathways for these callicarpins are proposed. Compounds 2, 3b, and 6-8 showed potent inhibitory effects against the NLRP3 inflammasome with IC50 values from 1.4 to 5.3 μM, and 2 significantly blocked NLRP3 inflammasome-induced pyroptosis by inhibiting Casp-1 activation and IL-1β secretion in J774A.1 cells.
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Affiliation(s)
- De-Bing Pu
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, People's Republic of China
| | - Xing-Jie Zhang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, People's Republic of China
| | - De-Wen Bi
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, People's Republic of China
| | - Jun-Bo Gao
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, People's Republic of China
| | - Yan Yang
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, People's Republic of China
| | - Xiao-Li Li
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, People's Republic of China
| | - Jing Lin
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, People's Republic of China
| | - Xiao-Nian Li
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, People's Republic of China
| | - Rui-Han Zhang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, People's Republic of China
| | - Wei-Lie Xiao
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, People's Republic of China
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Wang WQ, Yin YP, Jun L, Xuan LJ. Halimane-type diterpenoids from Vitex rotundifolia and their anti-hyperlipidemia activities. PHYTOCHEMISTRY 2018; 146:56-62. [PMID: 29247892 DOI: 10.1016/j.phytochem.2017.12.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Revised: 11/30/2017] [Accepted: 12/04/2017] [Indexed: 06/07/2023]
Abstract
Vitex rotundifolia is the variant of the traditional Chinese medicine (TCM) Vitex trifolia. Diterpenoids from V. trifolia have shown anti-hyperlipidemia activity. As part of a continuous research program of searching for anti-hyperlipidemia constituents from TCM, 95% alcohol extract of the fruits of V. rotundifolia was fully studied, and 18 diterpenoids were isolated, including eight previously undescribed compounds (viterofolins A-H). Among them, viterofolins A-B were previously undescribed rearranged halimane-type diterpenoids, viterofolins CH were previously undescribed halimane-type diterpenoids. These compounds were then firstly evaluated in lipid (Dil-LDL) uptake assay in HepG2 cells. Viterofolin H, (5S, 6R, 8R, 9R, 10S)-6-acetoxy-9-hydroxy-13 (14)-labden-16,15-olide and previtexilactone showed moderate activities in promoting LDL uptake (1.27-1.35 fold). This work laid the foundation for searching anti-hyperlipidemia natural products.
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Affiliation(s)
- Wen-Qiong Wang
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 501 Haike Road, Zhangjiang Hi-Tech Park, Shanghai 201203, PR China
| | - Yan-Peng Yin
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 501 Haike Road, Zhangjiang Hi-Tech Park, Shanghai 201203, PR China
| | - Li Jun
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 501 Haike Road, Zhangjiang Hi-Tech Park, Shanghai 201203, PR China
| | - Li-Jiang Xuan
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 501 Haike Road, Zhangjiang Hi-Tech Park, Shanghai 201203, PR China.
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4
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Casanova E, Knowles TDJ, Williams C, Crump MP, Evershed RP. Use of a 700 MHz NMR Microcryoprobe for the Identification and Quantification of Exogenous Carbon in Compounds Purified by Preparative Capillary Gas Chromatography for Radiocarbon Determinations. Anal Chem 2017; 89:7090-7098. [DOI: 10.1021/acs.analchem.7b00987] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Emmanuelle Casanova
- Organic
Geochemistry Unit, School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
| | - Timothy D. J. Knowles
- Bristol
Radiocarbon Accelerator Mass Spectrometer, University of Bristol, 43 Woodland Road, Bristol BS8 1UU, U.K
| | - Christopher Williams
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
- BrisSynBio, University of Bristol, Life Sciences Building, Tyndall
Avenue, Bristol BS8 1TQ, U.K
| | - Matthew P. Crump
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
- BrisSynBio, University of Bristol, Life Sciences Building, Tyndall
Avenue, Bristol BS8 1TQ, U.K
| | - Richard P. Evershed
- Organic
Geochemistry Unit, School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
- Bristol
Radiocarbon Accelerator Mass Spectrometer, University of Bristol, 43 Woodland Road, Bristol BS8 1UU, U.K
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Burgueño-Tapia E, Joseph-Nathan P. Vibrational Circular Dichroism: Recent Advances for the Assignment of the Absolute Configuration of Natural Products. Nat Prod Commun 2017. [DOI: 10.1177/1934578x1701200501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Vibrational circular dichroism (VCD) emerged during the last decade as a reliable tool for the absolute configuration (AC) determination of organic compounds. The principles, instrumentation, and methodology applied prior to early 2013 were recently reviewed by us. Since VCD is a very dynamic field, the aim of this review is to update VCD advances for the AC assignment of terpenoids, aromatic compounds, alkaloids, and other natural products for the 2013–2014 period, when VCD was applied to the AC assignment of some 70 natural products. In addition, although discovered in 2012, a brief introduction to the VCD exciton coupling approach and its applications in natural products AC assignment is presented.
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Affiliation(s)
- Eleuterio Burgueño-Tapia
- Departamento de Química Orgánica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala, Col. Santo Tomás, México D.F., 11340 Mexico
| | - Pedro Joseph-Nathan
- Departamento de Química, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Apartado 14–740, México D.F., 07000 Mexico
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Burgueño-Tapia E, Joseph-Nathan P. Vibrational Circular Dichroism: Recent Advances for the Assignment of the Absolute Configuration of Natural Products. Nat Prod Commun 2015. [DOI: 10.1177/1934578x1501001036] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Vibrational circular dichroism (VCD) emerged during the last decade as a reliable tool for the absolute configuration (AC) determination of organic compounds. The principles, instrumentation, and methodology applied prior to early 2013 were recently reviewed by us. Since VCD is a very dynamic field, the aim of this review is to update VCD advances for the AC assignment of terpenoids, aromatic compounds, alkaloids, and other natural products for the 2013-2014 period, when VCD was applied to the AC assignment of some 70 natural products. In addition, although discovered in 2012, a brief introduction to the VCD exciton coupling approach and its applications in natural products AC assignment is presented.
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Affiliation(s)
- Eleuterio Burgueño-Tapia
- Departamento de Quimica Orgdnica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico National, Prolongatión de Carpio y Plan de Ayala, Col. Santo Tomás, México D.F., 11340 Mexico
| | - Pedro Joseph-Nathan
- Departamento de Química, Centro de Investigatión y de Estudios Avanzados del Instituto Politécnico Nacional, Apartado 14-740, México D.F., 07000 Mexico
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Abstract
This review covers the isolation and chemistry of diterpenoids from terrestrial as opposed to marine sources and includes, labdanes, clerodanes, pimaranes, abietanes, kauranes, gibberellins, cembranes and their cyclization products. The literature from January to December, 2014 is reviewed.
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Batista Jr. JM, Blanch EW, Bolzani VDS. Recent advances in the use of vibrational chiroptical spectroscopic methods for stereochemical characterization of natural products. Nat Prod Rep 2015; 32:1280-302. [DOI: 10.1039/c5np00027k] [Citation(s) in RCA: 116] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A comprehensive look into application of vibrational optical activity methods for conformational and configurational assignments in natural product molecules over the last 15 years is provided.
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Affiliation(s)
- João M. Batista Jr.
- Department of Chemistry
- Federal University of São Carlos – UFSCar
- São Carlos
- Brazil
| | - Ewan W. Blanch
- School of Applied Sciences
- RMIT University
- Melbourne
- Australia
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