1
|
Demertzidou VP, Kourgiantaki M, Zografos AL. Expanding Natural Diversity: Tailored Enrichment of the 8,12-Sesquiterpenoid Lactone Chemical Space through Divergent Synthesis. Org Lett 2024; 26:4648-4653. [PMID: 38780007 PMCID: PMC11187629 DOI: 10.1021/acs.orglett.4c01374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2024] [Revised: 05/21/2024] [Accepted: 05/22/2024] [Indexed: 05/25/2024]
Abstract
The divergent synthesis of a non-natural 8,12-sesquiterpenoid lactone collection is described. The synthesis relies on a rationally designed guaianolide scaffold bearing a tertiary hydroxyl as the pinpoint for inducing its selective diversification. Key reactions include an unprecedented Suarez-type CH lactonization and a highly diastereoselective oxy-Cope/ene cascade that allows the introduction of three stereocenters in a single operation. Selective oxidative/reductive and redox neutral transformations follow to highlight the synthesis of naturally unpresented highly substituted 8,12-guaianolides.
Collapse
Affiliation(s)
| | | | - Alexandros L. Zografos
- Aristotle University of
Thessaloniki, Department of Chemistry,
Laboratory of Organic Chemistry, Thessaloniki 54124, Greece
| |
Collapse
|
2
|
Zhao P, Xin BS, Ye L, Ma ZT, Yao GD, Shi R, He XH, Lin B, Huang XX, Song SJ. Structurally diverse rearranged sesquiterpenoids, including a pair of rare tautomers, from the aerial parts of Daphne penicillata. PHYTOCHEMISTRY 2024; 218:113950. [PMID: 38101591 DOI: 10.1016/j.phytochem.2023.113950] [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: 08/27/2023] [Revised: 11/26/2023] [Accepted: 12/05/2023] [Indexed: 12/17/2023]
Abstract
Eight structurally diverse rearranged sesquiterpenoids, including seven undescribed sesquiterpenoids (1a/1b and 3-8) were obtained from the aerial parts of Daphne penicillata. 1a/1b, 3, 5 and 6 possess rare rearranged guaiane skeletons and 4 represents the first example of rearranged carotene sesquiterpenoids. Their structures and absolute configurations were determined by extensive spectroscopic analyses, NMR and ECD calculations. Interestingly, 1a and 1b were a pair of magical interconverting epimers that may interconvert by retro-aldol condensation. The mechanism of interconversion has been demonstrated indirectly by 9-OH derivatization of 1a/1b and a hypothetical biogenetic pathway was proposed. All compounds were evaluated for anti-inflammatory and cytotoxic activities. Among them, 1a/1b and 2 exhibited potential inhibitory activities on the production of NO against LPS-induced BV2 microglial cells.
Collapse
Affiliation(s)
- Peng Zhao
- Key Laboratory of Computational Chemistry-Based Natural Antitumor Drug Research & Development, Liaoning Province, China; Engineering Research Center of Natural Medicine Active Molecule Research & Development, Liaoning Province, China; Key Laboratory of Natural Bioactive Compounds Discovery & Modification, Shenyang, China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, Liaoning, 110016, China
| | - Ben-Song Xin
- Key Laboratory of Computational Chemistry-Based Natural Antitumor Drug Research & Development, Liaoning Province, China; Engineering Research Center of Natural Medicine Active Molecule Research & Development, Liaoning Province, China; Key Laboratory of Natural Bioactive Compounds Discovery & Modification, Shenyang, China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, Liaoning, 110016, China
| | - Li Ye
- Key Laboratory of Computational Chemistry-Based Natural Antitumor Drug Research & Development, Liaoning Province, China; Engineering Research Center of Natural Medicine Active Molecule Research & Development, Liaoning Province, China; Key Laboratory of Natural Bioactive Compounds Discovery & Modification, Shenyang, China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, Liaoning, 110016, China
| | - Zhen-Tao Ma
- Key Laboratory of Computational Chemistry-Based Natural Antitumor Drug Research & Development, Liaoning Province, China; Engineering Research Center of Natural Medicine Active Molecule Research & Development, Liaoning Province, China; Key Laboratory of Natural Bioactive Compounds Discovery & Modification, Shenyang, China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, Liaoning, 110016, China
| | - Guo-Dong Yao
- Key Laboratory of Computational Chemistry-Based Natural Antitumor Drug Research & Development, Liaoning Province, China; Engineering Research Center of Natural Medicine Active Molecule Research & Development, Liaoning Province, China; Key Laboratory of Natural Bioactive Compounds Discovery & Modification, Shenyang, China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, Liaoning, 110016, China
| | - Rui Shi
- Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains of China, Ministry of Education, International Ecological Foresty Research Center of Kunming, Horticulture and Landscape Architecture, Southwest Forestry University, Yunnan Kunming, 650224, China
| | - Xia-Hong He
- Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains of China, Ministry of Education, International Ecological Foresty Research Center of Kunming, Horticulture and Landscape Architecture, Southwest Forestry University, Yunnan Kunming, 650224, China
| | - Bin Lin
- Wuya College of Innovation, Shenyang Pharmaceutical University, Shenyang, 110016, China.
| | - Xiao-Xiao Huang
- Key Laboratory of Computational Chemistry-Based Natural Antitumor Drug Research & Development, Liaoning Province, China; Engineering Research Center of Natural Medicine Active Molecule Research & Development, Liaoning Province, China; Key Laboratory of Natural Bioactive Compounds Discovery & Modification, Shenyang, China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, Liaoning, 110016, China; Basic Science Research Center Base (Pharmaceutical Science), Shandong Province, Yantai University, Yantai, 264005, China.
| | - Shao-Jiang Song
- Key Laboratory of Computational Chemistry-Based Natural Antitumor Drug Research & Development, Liaoning Province, China; Engineering Research Center of Natural Medicine Active Molecule Research & Development, Liaoning Province, China; Key Laboratory of Natural Bioactive Compounds Discovery & Modification, Shenyang, China; School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, Liaoning, 110016, China.
| |
Collapse
|
3
|
Kourgiantaki M, Demertzidou VP, Zografos AL. Short Scalable Route to Apiaceae Sesquiterpene Scaffolds: Total Synthesis of 4- epi-Epiguaidiol A. Org Lett 2022; 24:8476-8480. [PMID: 36264031 DOI: 10.1021/acs.orglett.2c03215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The oxy-Cope/ene reaction cascade to form a locked elemane conformer allows the short scalable synthesis of versatile Apiaceae scaffolds. The divergent fate of the obtained macrocyclic germacrane is surveyed under cationic and dioxygen-induced Prins-type reaction conditions to allow the diastereoselective synthesis of oxidized Apiaceae guaiane congeners and the total synthesis of 4-epi-epiguaidiol A. Additionally, the unprecedented reduction of a hydrogen-bond-biased guaiane substrate permits the chemoselective synthesis of desoxo-jungiaguaiane.
Collapse
Affiliation(s)
- Maria Kourgiantaki
- Department of Chemistry, Laboratory of Organic Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - Vera P Demertzidou
- Department of Chemistry, Laboratory of Organic Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| | - Alexandros L Zografos
- Department of Chemistry, Laboratory of Organic Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
| |
Collapse
|
4
|
Demertzidou VP, Kourgiantaki M, Zografos AL. A multifunctional divergent scaffold to access the formal syntheses of various sesquiterpenoids. Org Biomol Chem 2021; 19:8687-8690. [PMID: 34553736 DOI: 10.1039/d1ob01716k] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The development of a divergent scaffold able to access an array of diverse natural sesquiterpenoids is described. The route unifies the scope of previously reported plans of our group to allow the scalable synthesis of 8,12-furo and lactone sesquiterpenoid carbocyclic cores of elemanes, germacranes, guaianes, cadinanes, lindenanes and myliols. The formal syntheses of furogermenone, methyl-curdionolide, zedoarol, qweicurculactone, lindenene and sarcandralactone A are reported.
Collapse
Affiliation(s)
- Vera P Demertzidou
- Aristotle University of Thessaloniki, Department of Chemistry, Laboratory of Organic Chemistry, University Campus, Chemistry Old Building, Thessaloniki 54124, Greece.
| | - Maria Kourgiantaki
- Aristotle University of Thessaloniki, Department of Chemistry, Laboratory of Organic Chemistry, University Campus, Chemistry Old Building, Thessaloniki 54124, Greece.
| | - Alexandros L Zografos
- Aristotle University of Thessaloniki, Department of Chemistry, Laboratory of Organic Chemistry, University Campus, Chemistry Old Building, Thessaloniki 54124, Greece.
| |
Collapse
|
5
|
Qin Z, Zhao M, Zhang K, Goto M, Lee KH, Li J. Selectfluor-Enabled C(sp 3)-H Alkoxylation of 3-Methylfuranocoumarins. J Org Chem 2021; 86:7864-7871. [PMID: 34033489 DOI: 10.1021/acs.joc.1c00776] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A facile and metal-free method for the direct C(sp3)-H bond alkoxylation of 3-methylfuranocoumarins with alcohols has been disclosed. Selectfluor enabled the (hetero)benzylic C-H etherification by tuning the reaction temperature and solvent. Various alcohols were compatible in this transformation with suitable yields. The mechanistic studies revealed that the reaction might undergo the double addition process of alcohols, as well as the departure of a fluoride anion and the formation of an oxonium ion.
Collapse
Affiliation(s)
- Zengxin Qin
- Department of Organic Chemistry, College of Chemistry, Jilin University, Jiefang Road 2519, Changchun 130023, China
| | - Mengfei Zhao
- Department of Organic Chemistry, College of Chemistry, Jilin University, Jiefang Road 2519, Changchun 130023, China
| | - Kaixin Zhang
- Department of Organic Chemistry, College of Chemistry, Jilin University, Jiefang Road 2519, Changchun 130023, China
| | - Masuo Goto
- Natural Products Research Laboratories, UNC Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina 27599, United States
| | - Kuo-Hsiung Lee
- Natural Products Research Laboratories, UNC Eshelman School of Pharmacy, University of North Carolina, Chapel Hill, North Carolina 27599, United States
| | - Jizhen Li
- Department of Organic Chemistry, College of Chemistry, Jilin University, Jiefang Road 2519, Changchun 130023, China
| |
Collapse
|
6
|
Yakovleva MP, Mingaleeva GR, Denisova KS, Ishmuratov GY. Synthesis of optically active macrolides bearing di- and triethylene glycol and dicarboxylic acid hydrazide moieties from (-)-α-pinene. Russ Chem Bull 2019. [DOI: 10.1007/s11172-019-2575-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
7
|
Bao W, Tao Y, Cheng J, Huang J, Cao J, Zhang M, Ye W, Wang B, Li Y, Zhu L, Lee CS. In(OTf) 3-Catalyzed Cascade Cyclization for Construction of Oxatricyclic Compounds. Org Lett 2018; 20:7912-7915. [PMID: 30543298 DOI: 10.1021/acs.orglett.8b03461] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A highly diastereoselective cascade cyclization reaction has been developed for establishing a series of oxatricyclic compounds using Chan's diene and simple keto alkynal substrates with only 1 mol % of In(OTf)3 as the catalyst in 82-92% yields. The potential utility of this synthetic strategy has been demonstrated in model studies for the construction the core structures of 1α,8α:4α,5α-diepoxy-4,5-dihydroosmitopsin and cortistatin A.
Collapse
Affiliation(s)
- Wenli Bao
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology , Peking University Shenzhen Graduate School , Shenzhen University Town, Xili, Shenzhen 518055 , China
| | - Yezi Tao
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology , Peking University Shenzhen Graduate School , Shenzhen University Town, Xili, Shenzhen 518055 , China
| | - Jiangqun Cheng
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology , Peking University Shenzhen Graduate School , Shenzhen University Town, Xili, Shenzhen 518055 , China
| | - Junrong Huang
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology , Peking University Shenzhen Graduate School , Shenzhen University Town, Xili, Shenzhen 518055 , China
| | - Jingming Cao
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology , Peking University Shenzhen Graduate School , Shenzhen University Town, Xili, Shenzhen 518055 , China
| | - Mengxun Zhang
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology , Peking University Shenzhen Graduate School , Shenzhen University Town, Xili, Shenzhen 518055 , China
| | - Weijian Ye
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology , Peking University Shenzhen Graduate School , Shenzhen University Town, Xili, Shenzhen 518055 , China
| | - Bo Wang
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology , Peking University Shenzhen Graduate School , Shenzhen University Town, Xili, Shenzhen 518055 , China
| | - Yang Li
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology , Peking University Shenzhen Graduate School , Shenzhen University Town, Xili, Shenzhen 518055 , China
| | - Lizhi Zhu
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology , Peking University Shenzhen Graduate School , Shenzhen University Town, Xili, Shenzhen 518055 , China.,Institute of Translational Medicine, Shenzhen Second People's Hospital , The First Affiliated Hospital of Shenzhen University, Health Science Center , Shenzhen 518035 , China
| | - Chi-Sing Lee
- Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology , Peking University Shenzhen Graduate School , Shenzhen University Town, Xili, Shenzhen 518055 , China.,Institute of Research and Continuing Edition (Shenzhen) , Hong Kong Baptist University , Industrialization Complex Building, Shenzhen Virtual University Park, Shenzhen 518000 , China.,Department of Chemistry , Hong Kong Baptist University , Kowloon Tong , Hong Kong SAR
| |
Collapse
|
8
|
Akrivou MG, Demertzidou VP, Theodoroula NF, Chatzopoulou FM, Kyritsis KA, Grigoriadis N, Zografos AL, Vizirianakis IS. Uncovering the pharmacological response of novel sesquiterpene derivatives that differentially alter gene expression and modulate the cell cycle in cancer cells. Int J Oncol 2018; 53:2167-2179. [PMID: 30226586 DOI: 10.3892/ijo.2018.4550] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Accepted: 06/05/2018] [Indexed: 11/05/2022] Open
Abstract
The present study aimed to assess the pharmacological anticancer profile of three natural and five synthetic sesquiterpenes developed by total chemical synthesis. To this end, their properties at the cellular and molecular level were evaluated in a panel of normal and cancer cell lines. The results obtained by performing cytotoxicity assays and gene expression analysis by reverse transcription-quantitative polymerase chain reaction showed that: i) Among the sesquiterpene derivatives analyzed, VDS58 exhibited a notable anticancer profile within attached (U-87 MG and MCF-7) and suspension (K562 and MEL-745) cancer cell cultures; however, U-87 MG cells were able to recover their proliferation capacity rapidly after 48 h of exposure; ii) gene expression profiling of U-87 MG cells, in contrast to K562 cells, showed a transient induction of cyclin-dependent kinase inhibitor 1A (CDKN1) expression; iii) the expression levels of transforming growth factor β1 (TGFB1) increased after 12 h of exposure of U-87 MG cells to VDS58 and were maintained at this level throughout the treatment period; iv) in K562 cells exposed to VDS58, TGFB1 expression levels were upregulated for 48 h and decrease afterwards; and v) the re-addition of VDS58 in U-87 MG cultures pretreated with VDS58 resulted in a notable increase in the expression of caspases (CASP3 and CASP9), BCL2‑associated agonist of cell death (BAD), cyclin D1, CDK6, CDKN1, MYC proto-oncogene bHLH transcription factor (MYC), TGFB1 and tumor suppressor protein p53. This upregulation persisted only for 24 h for the majority of genes, as afterwards, only the expression of TGFB1 and MYC was maintained at high levels. Through bioinformatic pathway analysis of RNA-Seq data of parental U-87 MG and K562 cells, substantial variation was reported in the expression profiles of the genes involved in the regulation of the cell cycle. This was associated with the differential pharmacological profiles observed in the same cells exposed to VDS58. Overall, the data presented in this study provide novel insights into the molecular mechanisms of action of sesquiterpene derivatives by dysregulating the expression levels of genes associated with the cell cycle of cancer cells.
Collapse
Affiliation(s)
- Melpomeni G Akrivou
- Department of Pharmacology, School of Pharmacy, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - Vera P Demertzidou
- Department of Chemistry, Laboratory of Organic Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - Nikoleta F Theodoroula
- Department of Pharmacology, School of Pharmacy, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | | | - Konstantinos A Kyritsis
- Department of Pharmacology, School of Pharmacy, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | | | - Alexandros L Zografos
- Department of Chemistry, Laboratory of Organic Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - Ioannis S Vizirianakis
- Department of Pharmacology, School of Pharmacy, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| |
Collapse
|
9
|
Demertzidou VP, Pappa S, Sarli V, Zografos AL. Regioselective Ene-Type Allylic Chlorination of Electron-Rich Alkenes by Activated DMSO. J Org Chem 2017; 82:8710-8715. [PMID: 28753300 DOI: 10.1021/acs.joc.7b01103] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A simple protocol involving the activation of DMSO by chlorotrimethysilane is described for the chemoselective chlorination of polyprenoids. The proposed protocol provides a versatile and scalable alternative to existing routes for accessing useful synthetic synthons for the synthesis of complex terpenoids.
Collapse
Affiliation(s)
- Vera P Demertzidou
- Laboratory of Organic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki , Main University Campus, 54124 Thessaloniki, Greece
| | - Stavroula Pappa
- Laboratory of Organic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki , Main University Campus, 54124 Thessaloniki, Greece
| | - Vasiliki Sarli
- Laboratory of Organic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki , Main University Campus, 54124 Thessaloniki, Greece
| | - Alexandros L Zografos
- Laboratory of Organic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki , Main University Campus, 54124 Thessaloniki, Greece
| |
Collapse
|
10
|
Photochemical oxidation of furans in the synthesis of natural compounds (microreview). Chem Heterocycl Compd (N Y) 2016. [DOI: 10.1007/s10593-016-1895-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
11
|
Demertzidou VP, Zografos AL. Platinum-catalyzed cycloisomerizations of a common enyne: a divergent entry to cyclopropane sesquiterpenoids. Formal synthesis of sarcandralactone A. Org Biomol Chem 2016; 14:6942-6. [PMID: 27353206 DOI: 10.1039/c6ob01226d] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A common enyne scaffold, resembling the structures of natural elemanes was found to be an excellent substrate for highly regioselective cycloisomerizations to produce diverse cyclopropane sesquiterpenoids. Platinum-catalysis was utilized to produce either lindenane or myliol cores, found in natural products, starting from enyne acetate 10 and its corresponding allene 12 respectively. Based on this concept, a second generation strategy allows the formal synthesis of sarcandralactone A.
Collapse
Affiliation(s)
- Vera P Demertzidou
- Department of Chemistry, Laboratory of Organic Chemistry, Aristotle University of Thessaloniki, University Campus, 54124, Thessaloniki, Greece.
| | | |
Collapse
|
12
|
Serba C, Lagoutte R, Winssinger N. Rapid and Scalable Synthesis ofcis-Fused Guaiane-Type Sesquiterpenes. European J Org Chem 2016. [DOI: 10.1002/ejoc.201501277] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
13
|
Anagnostaki EE, Demertzidou VP, Zografos AL. Divergent pathways to furosesquiterpenes: first total syntheses of (+)-zedoarol and (Rac)-gweicurculactone. Chem Commun (Camb) 2015; 51:2364-7. [DOI: 10.1039/c4cc09298h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Divergent transformation of a non-natural elemane to furo-guaiane and furo-cadinane cores.
Collapse
Affiliation(s)
- Elissavet E. Anagnostaki
- Aristotle University of Thessaloniki
- Department of Chemistry
- Laboratory of Organic Chemistry
- 54124 Thessaloniki
- Greece
| | - Vera P. Demertzidou
- Aristotle University of Thessaloniki
- Department of Chemistry
- Laboratory of Organic Chemistry
- 54124 Thessaloniki
- Greece
| | - Alexandros L. Zografos
- Aristotle University of Thessaloniki
- Department of Chemistry
- Laboratory of Organic Chemistry
- 54124 Thessaloniki
- Greece
| |
Collapse
|
14
|
Roosen PC, Vanderwal CD. Investigations into an anionic oxy-cope/transannular conjugate addition approach to 7,20-diisocyanoadociane. Org Lett 2014; 16:4368-71. [PMID: 25105694 DOI: 10.1021/ol502205m] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
An anionic oxy-Cope/transannular conjugate addition approach to the potent antimalarial 7,20-diisocyanoadociane is presented. The unexpected formation of undesired diastereomers in the key reaction led to the structural reassignment of previous products of this type of cascade and a reevaluation of the reversibility of the transannular ring closure. During efforts to coax the reaction toward the desired product, a transannular ene reaction provided tricyclic compounds relevant to the kempane diterpenoids.
Collapse
Affiliation(s)
- Philipp C Roosen
- Department of Chemistry, 1102 Natural Sciences II, University of California , Irvine, California 92697-2025, United States
| | | |
Collapse
|
15
|
Boukouvalas J, Jean MA. Streamlined biomimetic synthesis of paracaseolide A via aerobic oxidation of a 2-silyloxyfuran. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.05.054] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
16
|
Montagnon T, Kalaitzakis D, Triantafyllakis M, Stratakis M, Vassilikogiannakis G. Furans and singlet oxygen – why there is more to come from this powerful partnership. Chem Commun (Camb) 2014; 50:15480-98. [DOI: 10.1039/c4cc02083a] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Using the reaction of furans with singlet oxygen as a means to rapidly access huge structural diversity in a green & sustainable way.
Collapse
Affiliation(s)
- Tamsyn Montagnon
- Department of Chemistry
- University of Crete
- 71003 Iraklion, Greece
| | | | | | | | | |
Collapse
|