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Franov LJ, Hart JD, Pullella GA, Sumby CJ, George JH. Bioinspired Total Synthesis of Erectones A and B, and the Revised Structure of Hyperelodione D. Angew Chem Int Ed Engl 2022; 61:e202200420. [PMID: 35225410 PMCID: PMC9314102 DOI: 10.1002/anie.202200420] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Indexed: 12/22/2022]
Abstract
The field of biomimetic synthesis seeks to apply biosynthetic hypotheses to the efficient construction of complex natural products. This approach can also guide the revision of incorrectly assigned structures. Herein, we describe the evolution of a concise total synthesis and structural reassignment of hyperelodione D, a tetracyclic meroterpenoid derived from a Hypericum plant, alongside some biogenetically related natural products, erectones A and B. The key step in the synthesis of hyperelodione D forms six stereocentres and three rings in a bioinspired cascade reaction that features an intermolecular Diels-Alder reaction, an intramolecular Prins reaction and a terminating cycloetherification.
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Affiliation(s)
- Liam J Franov
- Department of Chemistry, University of Adelaide, Adelaide, SA 5000, Australia
| | - Jacob D Hart
- Department of Chemistry, University of Adelaide, Adelaide, SA 5000, Australia
| | - Glenn A Pullella
- Department of Chemistry, University of Adelaide, Adelaide, SA 5000, Australia
| | - Christopher J Sumby
- Department of Chemistry, University of Adelaide, Adelaide, SA 5000, Australia
| | - Jonathan H George
- Department of Chemistry, University of Adelaide, Adelaide, SA 5000, Australia
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Franov LJ, Hart JD, Pullella GA, Sumby CJ, George JH. Bioinspired Total Synthesis of Erectones A and B, and the Revised Structure of Hyperelodione D. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202200420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Liam J. Franov
- Department of Chemistry University of Adelaide Adelaide SA 5000 Australia
| | - Jacob D. Hart
- Department of Chemistry University of Adelaide Adelaide SA 5000 Australia
| | - Glenn A. Pullella
- Department of Chemistry University of Adelaide Adelaide SA 5000 Australia
| | | | - Jonathan H. George
- Department of Chemistry University of Adelaide Adelaide SA 5000 Australia
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Regioselective functionalization of pyrones: Facile synthesis of 6-styrylpyrones via KHMDS-mediated aldol condensation. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2021.153574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Tangdenpaisal K, Songthammawat P, Ruchirawat S, Ploypradith P. Total Synthesis of Palodesangrens A and C. J Org Chem 2021; 87:386-398. [PMID: 34904441 DOI: 10.1021/acs.joc.1c02417] [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
Palodesangrens A and C along with the common tetracyclic core are prepared from simple benzaldehyde and acetophenone derivatives in a 10-step longest linear sequence which featured the Diels-Alder reaction forming the cyclohexene moiety, LiAlH4 isomerization, stereoselective acid-catalyzed cyclization forming the chroman moiety, regioselective iodination/vinyl Suzuki cross-coupling reaction, and ring-closing metathesis (RCM) forming the 2H-pyran-2-one. Overall, the desired palodesangrens A and C are obtained in 6.1% and 6.4% yields, respectively.
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Affiliation(s)
- Kassrin Tangdenpaisal
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute, 54 Kamphaeng Phet 6 Road, Laksi, Bangkok 10210, Thailand
| | - Poramate Songthammawat
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute, 54 Kamphaeng Phet 6 Road, Laksi, Bangkok 10210, Thailand
| | - Somsak Ruchirawat
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute, 54 Kamphaeng Phet 6 Road, Laksi, Bangkok 10210, Thailand.,Program in Chemical Sciences, Chulabhorn Graduate Institute, Chulabhorn Royal Academy, 906 Kamphaeng Phet 6 Road, Laksi, Bangkok 10210, Thailand.,Centre of Excellence on Environmental Health and Toxicology, Commission on Higher Education (CHE), Ministry of Education, Bangkok 10400, Thailand
| | - Poonsakdi Ploypradith
- Laboratory of Medicinal Chemistry, Chulabhorn Research Institute, 54 Kamphaeng Phet 6 Road, Laksi, Bangkok 10210, Thailand.,Program in Chemical Sciences, Chulabhorn Graduate Institute, Chulabhorn Royal Academy, 906 Kamphaeng Phet 6 Road, Laksi, Bangkok 10210, Thailand.,Centre of Excellence on Environmental Health and Toxicology, Commission on Higher Education (CHE), Ministry of Education, Bangkok 10400, Thailand
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Lu JB, Shi CH, Hu D, Gao XY, Chen ZC, Du W, Chen YC. Regioselectivity Umpolung in Asymmetric Diels–Alder Reaction of ortho-Formyl-Substituted Cinnamates and Dienals via Double Aminocatalysis. Org Lett 2020; 23:145-149. [PMID: 33326232 DOI: 10.1021/acs.orglett.0c03862] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Jian-Bin Lu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Chong-Hui Shi
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Di Hu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Xin-Yue Gao
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Zhi-Chao Chen
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Wei Du
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Ying-Chun Chen
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
- College of Pharmacy, Third Military Medical University, Shapingba, Chongqing 400038, China
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Tangdenpaisal K, Songthammawat P, Akkarasereenon K, Chuayboonsong K, Ruchirawat S, Ploypradith P. Total Synthesis of Palodesangren B Trimethyl Ether and D Dimethyl Ether via a Late-Stage Formation of 2 H-Pyran-2-one of the Tetrahydrobenzo[ c]pyranochromenone Core. J Org Chem 2019; 84:13410-13429. [PMID: 31409069 DOI: 10.1021/acs.joc.9b01596] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
In four steps from the tricyclic core, palodesangren B trimethyl ether and palodesangren D dimethyl ether could be synthesized in 29 and 18% overall yields, respectively. A reaction sequence comprising the regioselective MgCl2-mediated Casnati-Skattebøl ortho-formylation of phenol, Wittig methylenation, acryloylation, and Ru(II)-catalyzed ring-closing metathesis (RCM) led to the formation of the final 2H-pyran-2-one ring of the desired tetracyclic core.
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Affiliation(s)
- Kassrin Tangdenpaisal
- Laboratory of Medicinal Chemistry , Chulabhorn Research Institute , 54 Kamphaeng Phet 6 Road, Laksi , Bangkok 10210 , Thailand
| | - Poramate Songthammawat
- Program in Chemical Biology, Chulabhorn Graduate Institute , Chulabhorn Royal Academy , 906 Kamphaeng Phet 6 Road, Laksi , Bangkok 10210 , Thailand
| | - Kornkamon Akkarasereenon
- Program in Chemical Biology, Chulabhorn Graduate Institute , Chulabhorn Royal Academy , 906 Kamphaeng Phet 6 Road, Laksi , Bangkok 10210 , Thailand
| | - Kanokpish Chuayboonsong
- Program in Chemical Biology, Chulabhorn Graduate Institute , Chulabhorn Royal Academy , 906 Kamphaeng Phet 6 Road, Laksi , Bangkok 10210 , Thailand
| | - Somsak Ruchirawat
- Laboratory of Medicinal Chemistry , Chulabhorn Research Institute , 54 Kamphaeng Phet 6 Road, Laksi , Bangkok 10210 , Thailand.,Program in Chemical Biology, Chulabhorn Graduate Institute , Chulabhorn Royal Academy , 906 Kamphaeng Phet 6 Road, Laksi , Bangkok 10210 , Thailand.,Centre of Excellence on Environmental Health and Toxicology, Commission on Higher Education (CHE) , Ministry of Education , Bangkok 10400 , Thailand
| | - Poonsakdi Ploypradith
- Laboratory of Medicinal Chemistry , Chulabhorn Research Institute , 54 Kamphaeng Phet 6 Road, Laksi , Bangkok 10210 , Thailand.,Program in Chemical Biology, Chulabhorn Graduate Institute , Chulabhorn Royal Academy , 906 Kamphaeng Phet 6 Road, Laksi , Bangkok 10210 , Thailand.,Centre of Excellence on Environmental Health and Toxicology, Commission on Higher Education (CHE) , Ministry of Education , Bangkok 10400 , Thailand
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Slauson SR, Pemberton R, Ghosh P, Tantillo DJ, Aubé J. Domino Acylation/Diels-Alder Synthesis of N-Alkyl-octahydroisoquinolin-1-one-8-carboxylic Acids under Low-Solvent Conditions. J Org Chem 2015; 80:5260-71. [PMID: 25901898 DOI: 10.1021/acs.joc.5b00804] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The development of the domino reaction between an aminoethyl-substituted diene and maleic anhydride to afford an N-substituted octahydroisoquinolin-1-one is described. A typical procedure involves the treatment of a 1-aminoethyl-substituted butadiene with maleic anhydride at 0 °C to room temperature for 20 min under low-solvent conditions, which affords a series of isoquinolinone carboxylic acids in moderate to excellent yields. NMR monitoring suggested that the reaction proceeded via an initial acylation step followed by an intramolecular Diels-Alder reaction. For the latter step, a significant rate difference was observed depending on whether the amino group was substituted by a phenyl or an alkyl (usually benzyl) substituent, with the former noted by NMR to be substantially slower. The Diels-Alder step was studied by density functional theory (DFT) methods, leading to the conclusion that the degree of preorganization in the starting acylated intermediate had the largest effect on the reaction barriers. In addition, the effect of electronics on the aromatic ring in N-phenyl substrates was studied computationally and experimentally. Overall, this protocol proved considerably more amenable to scale up compared to earlier methods by eliminating the requirement of microwave batch chemistry for this reaction as well as significantly reducing the quantity of solvent.
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Affiliation(s)
- Stephen R Slauson
- †Department of Medicinal Chemistry, University of Kansas, Delbert M. Shankel Structural Biology Center, 2034 Becker Drive, Lawrence, Kansas 66047, United States
| | - Ryan Pemberton
- ‡Department of Chemistry, University of California at Davis, Davis, California 95616, United States
| | - Partha Ghosh
- †Department of Medicinal Chemistry, University of Kansas, Delbert M. Shankel Structural Biology Center, 2034 Becker Drive, Lawrence, Kansas 66047, United States
| | - Dean J Tantillo
- ‡Department of Chemistry, University of California at Davis, Davis, California 95616, United States
| | - Jeffrey Aubé
- †Department of Medicinal Chemistry, University of Kansas, Delbert M. Shankel Structural Biology Center, 2034 Becker Drive, Lawrence, Kansas 66047, United States
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