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Li B, Tan C, Ma T, Jia Y. Bioinspired Total Synthesis of Bipolarolides A and B. Angew Chem Int Ed Engl 2024; 63:e202319306. [PMID: 38212293 DOI: 10.1002/anie.202319306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 01/10/2024] [Accepted: 01/11/2024] [Indexed: 01/13/2024]
Abstract
We have achieved the first total synthesis of bipolarolides A and B, which possess an intriguing and complex 5/6/6/6/5 caged pentacyclic skeleton with seven contiguous stereocenters. The synthesis features a lithium-halogen exchange/intermolecular nucleophilic addition to link two enantioenriched fragments, two ring-closing metathesis reactions to assemble the five- and eight-membered rings, and a bioinspired Prins reaction/ether formation cascade cyclization to construct the 5/6/6/6/5 caged skeleton.
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Affiliation(s)
- Bo Li
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, and Chemical Biology Center, Peking University, Xue Yuan Rd. 38, Beijing, 100191, China
- Ningbo Institute of Marine Medicine, Peking University, Ningbo, 315010, China
| | - Chuanzhen Tan
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, and Chemical Biology Center, Peking University, Xue Yuan Rd. 38, Beijing, 100191, China
- Ningbo Institute of Marine Medicine, Peking University, Ningbo, 315010, China
| | - Tianhao Ma
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, and Chemical Biology Center, Peking University, Xue Yuan Rd. 38, Beijing, 100191, China
- Ningbo Institute of Marine Medicine, Peking University, Ningbo, 315010, China
| | - Yanxing Jia
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, and Chemical Biology Center, Peking University, Xue Yuan Rd. 38, Beijing, 100191, China
- Ningbo Institute of Marine Medicine, Peking University, Ningbo, 315010, China
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Ren K, Zhao M, Hu B, Lu B, Xie X, Ratovelomanana-Vidal V, Zhang Z. An Enantioselective Approach to 4-O-Protected-2-cyclopentene-l,4-diol Derivatives via a Rhodium-Catalyzed Redox-Isomerization Reaction. J Org Chem 2015; 80:12572-9. [PMID: 26605977 DOI: 10.1021/acs.joc.5b02519] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Kinetic resolution of a series of cyclopentene-1,4-diol derivatives has been successfully achieved with enantiomeric excess up to 99.4% and a kf/ks ratio of 55 by a rhodium-catalyzed redox-isomerization reaction in a noncoordinating solvent.
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Affiliation(s)
- Kai Ren
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, P. R. China
| | - Mengmeng Zhao
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, P. R. China
| | - Bei Hu
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, P. R. China
| | - Bin Lu
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, P. R. China
| | - Xiaomin Xie
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, P. R. China
| | | | - Zhaoguo Zhang
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, P. R. China.,State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry , 345 Lingling Road, Shanghai 200032, P. R. China
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Abstract
This critical review offers an overview of asymmetric electrocyclic processes, where diastereo- or enantioselectivity is a consequence of the influence of a chiral component (be it substrate or catalyst) on the electrocyclic bond-forming process (195 references).
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Affiliation(s)
- Sam Thompson
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, UK
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Paquette LA, Liu Z, Ramsey C, Gallucci JC. Competitive Stereochemical Control Operative during Conrotatory Electrocyclization of Helically Equilibrating Diquinanyl-Substituted 1,3,5,7-Octatetraenyl Bisenolates. J Org Chem 2005; 70:8154-61. [PMID: 16277342 DOI: 10.1021/jo0513919] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[Carbohydrate structure: see text] Activation of the squarate ester cascade by adding the lithiated bicyclo[3.3.0]octene 20 and vinyllithium sequentially to 1 results in the isolation of the four tetracyclic products 21-24. The structures of the topographically complex products were deduced by 2D NMR spectroscopy and X-ray diffraction studies. The mechanistic insights gained by these findings are discussed. The product distribution is telltale evidence for predominant 1,2-addition of the second alkenyl anion. Product stereochemistry is in turn diagnostic of the preferred mode of conrotatory ring closure operating within equilibrating helical intermediates of opposite pitch. A competing pathway for the elimination of methanol in these highly functionalized intermediates has been observed for the first time.
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Affiliation(s)
- Leo A Paquette
- Evans Chemical Laboratories, Ohio State University, Columbus, Ohio 43210, USA.
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Paquette LA, Geng F. Applications of the squarate ester cascade to the expeditious synthesis of hypnophilin, coriolin, and ceratopicanol. J Am Chem Soc 2002; 124:9199-203. [PMID: 12149025 DOI: 10.1021/ja020474t] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The first applications of the squarate ester cascade to natural products synthesis have been realized. Only 10 laboratory steps mediate the conversion of diisopropyl squarate to (+/-)-hypnophilin (8). Key reactions include a combination of chlorination, reduction, dehydration, and oxidation maneuvers in the proper sequence. A penultimate precursor to 8 has previously been converted into coriolin (9), thereby allowing a formal synthesis of racemic 9 also to be claimed. A rather different strategy was employed to arrive at (+/-)-ceratopicanol (10). Of the seven steps involved, three consisted of the use of lithium in liquid ammonia. The three divergent synthetic objectives realized in these experiments involved (a) generation of an extended enolate anion and its regioselective C-methylation at the gamma-carbon; (b) unprecedented reductive cleavage of a beta-isopropoxy group in a 2,3-diisopropoxy-2-cyclopentenone setting; and (c) conventional conversion of an alpha-alkoxy ketone to the parent carbonyl system. Thus, the appreciable enhancement in structural complexity offered by the squarate cascade holds considerable potential for the concise synthesis of constitutionally intricate targets.
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Affiliation(s)
- Leo A Paquette
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210, USA.
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Geng F, Liu J, Paquette LA. Three-component coupling via the squarate ester cascade as a concise route to the bioactive triquinane sesquiterpene hypnophilin. Org Lett 2002; 4:71-3. [PMID: 11772093 DOI: 10.1021/ol0102388] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] A squarate ester cascade is used to provide in one step, via the coupling of three reactants, a highly oxygenated linear triquinane product. The latter is transformed in nine steps into hypnophilin. The access route involves a combination of chlorination, reduction, dehydration, and oxidation maneuvers in the proper sequence.
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Affiliation(s)
- Feng Geng
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210, USA
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8
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Paquette LA, Tae J. 1,5-Asymmetric Induction in Squarate Cascades. Conformational Control of Helicity by Chiral Amino Substituents during Conrotatory Octatetraene Cyclization Prior to β-Elimination. J Org Chem 1998. [DOI: 10.1021/jo9722921] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Leo A. Paquette
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210
| | - Jinsung Tae
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210
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Paquette LA, Kuo LH, Tae J. Evaluation of Amino Substituents as Nucleofugal Controllers of Regioselectivity and as Chelate Modulators of Stereoselectivity in Squarate Ester Cascades. J Org Chem 1998. [DOI: 10.1021/jo9722919] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Leo A. Paquette
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210
| | - Lung Huang Kuo
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210
| | - Jinsung Tae
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210
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