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Rinu PXT, Radhika S, Anilkumar G. Recent Applications and Trends in the Julia‐Kocienski Olefination. ChemistrySelect 2022. [DOI: 10.1002/slct.202200760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
| | - Sankaran Radhika
- School of Chemical Sciences Mahatma Gandhi University Priyadarsini Hills P O. Kottayam Kerala INDIA 686560
| | - Gopinathan Anilkumar
- School of Chemical Sciences Mahatma Gandhi University Priyadarsini Hills P O. Kottayam Kerala INDIA 686560
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Curvicollide D Isolated from the Fungus Amesia sp. Kills African Trypanosomes by Inhibiting Transcription. Int J Mol Sci 2022; 23:ijms23116107. [PMID: 35682786 PMCID: PMC9181715 DOI: 10.3390/ijms23116107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 05/25/2022] [Accepted: 05/27/2022] [Indexed: 12/10/2022] Open
Abstract
Sleeping sickness or African trypanosomiasis is a serious health concern with an added socio-economic impact in sub-Saharan Africa due to direct infection in both humans and their domestic livestock. There is no vaccine available against African trypanosomes and its treatment relies only on chemotherapy. Although the current drugs are effective, most of them are far from the modern concept of a drug in terms of toxicity, specificity and therapeutic regime. In a search for new molecules with trypanocidal activity, a high throughput screening of 2000 microbial extracts was performed. Fractionation of one of these extracts, belonging to a culture of the fungus Amesia sp., yielded a new member of the curvicollide family that has been designated as curvicollide D. The new compound showed an inhibitory concentration 50 (IC50) 16-fold lower in Trypanosoma brucei than in human cells. Moreover, it induced cell cycle arrest and disruption of the nucleolar structure. Finally, we showed that curvicollide D binds to DNA and inhibits transcription in African trypanosomes, resulting in cell death. These results constitute the first report on the activity and mode of action of a member of the curvicollide family in T. brucei.
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Ali R, Ahmed W, Jayant V, alvi S, Ahmed N, Ahmed A. Metathesis reactions in total‐ and natural product fragments syntheses. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202100753] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Rashid Ali
- Jamia Millia Islamia New Delhi India 110025 Department of Chemistry Jamia Nagar,New Delhi india110025 110025 New Delhi INDIA
| | - Waqar Ahmed
- Jamia Millia Islamia Central University: Jamia Millia Islamia Chemistry INDIA
| | - Vikrant Jayant
- Jamia Millia Islamia Central University: Jamia Millia Islamia Chemistry INDIA
| | - shakeel alvi
- Jamia Millia Islamia Central University: Jamia Millia Islamia Chemistry INDIA
| | - Nadeem Ahmed
- Jamia Millia Islamia Central University: Jamia Millia Islamia Chemistry INDIA
| | - Azeem Ahmed
- Jamia Millia Islamia Central University: Jamia Millia Islamia Chemistry INDIA
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Schmidt AC, Hiersemann M. Total Synthesis and Structural Assignment of (-)-Fusaequisin A. Chemistry 2021; 28:e202103558. [PMID: 34762322 PMCID: PMC9299783 DOI: 10.1002/chem.202103558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Indexed: 11/09/2022]
Abstract
(-)-Fusaequisin A is an irregularly assembled polyketide isolated from the ascomycete Fusarium equiseti. Fusaequisin A shares a carbon backbone with curvicollide C from the ascomycete Podospora curvicolla but its absolute configuration remained hitherto unsettled. Herein, we document the total synthesis of (-)-fusaequisin A and its 4-O-desmethyl derivative following a central-to-lateral building block strategy. Catalytic asymmetric Claisen rearrangement, Julia-Kocienski olefination and olefin cross-metathesis served as key C/C-connecting transformations. The constitution and absolute configuration of (-)-fusaequisin A was deduced and the original structural assignment was adjusted.
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Affiliation(s)
- Ann-Christin Schmidt
- Fakultät für Chemie und Chemische Biologie, TU Dortmund, 44227, Dortmund, Germany
| | - Martin Hiersemann
- Fakultät für Chemie und Chemische Biologie, TU Dortmund, 44227, Dortmund, Germany
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Chen R, Qiu D, Lei X, Niu Y, Hua Y, Peng H, Zeng T, Zhang Y. Total Synthesis and Assignment of the Absolute Configuration of (+)-Omphalic Acid. Org Lett 2021; 23:6972-6976. [PMID: 34397211 DOI: 10.1021/acs.orglett.1c02599] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Omphalane diterpenoids usually contain a cyclohexane-fused bicyclo[3.2.1]octane scaffold embedded with two continuous quaternary carbon centers, which pose considerable challenges to synthetic chemists. Herein, we reported the first total synthesis of omphalic acid with high stereochemical control, featuring an intermolecular Diels-Alder cycloaddition, ring reorganization through Criegee oxidative cleavage and programmed aldol condensations, conformationally controlled hydrogenation, and Pd-catalyzed carboxylation. The absolute configuration of omphalic acid was defined for the first time via the asymmetric total synthesis facilitated by a derivatization resolution protocol.
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Affiliation(s)
- Renzhi Chen
- Department of Chemistry, Department of Chemical Biology, and Key Laboratory of Chemical Biology of Fujian Province, iChEM, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, People's Republic of China
| | - Dongsheng Qiu
- Department of Chemistry, Department of Chemical Biology, and Key Laboratory of Chemical Biology of Fujian Province, iChEM, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, People's Republic of China
| | - Xin Lei
- Department of Chemistry, Department of Chemical Biology, and Key Laboratory of Chemical Biology of Fujian Province, iChEM, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, People's Republic of China
| | - Yujie Niu
- Department of Chemistry, Department of Chemical Biology, and Key Laboratory of Chemical Biology of Fujian Province, iChEM, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, People's Republic of China
| | - Yuhui Hua
- Department of Chemistry, Department of Chemical Biology, and Key Laboratory of Chemical Biology of Fujian Province, iChEM, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, People's Republic of China
| | - Huayu Peng
- Department of Chemistry, Department of Chemical Biology, and Key Laboratory of Chemical Biology of Fujian Province, iChEM, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, People's Republic of China
| | - Tao Zeng
- Department of Chemistry, Department of Chemical Biology, and Key Laboratory of Chemical Biology of Fujian Province, iChEM, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, People's Republic of China
| | - Yandong Zhang
- Department of Chemistry, Department of Chemical Biology, and Key Laboratory of Chemical Biology of Fujian Province, iChEM, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, People's Republic of China
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Schmidt AC, Iovkova L, Hiersemann M. (2 R,4 S,5 S)-5-Meth-oxy-4-methyl-3-oxohept-6-en-2-yl benzoate. IUCRDATA 2021; 6:x210951. [PMID: 36338945 PMCID: PMC9462372 DOI: 10.1107/s2414314621009512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Accepted: 09/13/2021] [Indexed: 11/11/2022] Open
Abstract
The title compound, C16H20O4, was synthesized in the course of the total synthesis of fusaequisin A in order to verify and confirm the configurations of the stereogenic centers and to exclude the possibility of epimerization during the methyl-ation process. The crystal structure of the title compound at 100 K has ortho-rhom-bic (P212121) symmetry. The absolute configuration was determined by anomalous dispersion and agrees with the configuration of the allylic alcohol used in the synthesis.
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Affiliation(s)
- Ann-Christin Schmidt
- Fakultät für Chemie und Chemische Biologie, Technische Universität Dortmund, Organische Chemie, 44227 Dortmund, Germany
| | - Lyuba Iovkova
- Fakultät für Chemie und Chemische Biologie, Technische Universität Dortmund, Organische Chemie, 44227 Dortmund, Germany
| | - Martin Hiersemann
- Fakultät für Chemie und Chemische Biologie, Technische Universität Dortmund, Organische Chemie, 44227 Dortmund, Germany
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