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Sun Y, Fu S, Liu B. Asymmetric synthesis of the fully functionalized six-membered A-ring of siphonol A. Org Biomol Chem 2024; 22:2958-2962. [PMID: 38483290 DOI: 10.1039/d4ob00104d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/18/2024]
Abstract
A synthetic study toward the construction of the fully functionalized six-membered A-ring of siphonol A is described. The salient features include the introduction of a six-membered ring system through a HWE reaction, the construction of a stereocenter at C5 via a hetero-Diels-Alder reaction, and the installation of the fully functionalized six-membered A-ring of siphonol A through photolytic decarboxylation.
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Affiliation(s)
- Ying Sun
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China.
| | - Shaomin Fu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China.
| | - Bo Liu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China.
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2
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Sun Y, Feng J, Qin S, Fu S, Liu B. Asymmetric Construction of the Core of C 6, C 7-Epoxy Daphnane Diterpenoid Orthoesters. Org Lett 2023; 25:8072-8076. [PMID: 37916924 DOI: 10.1021/acs.orglett.3c03136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2023]
Abstract
Asymmetric construction of the core of C6, C7-epoxy daphnane diterpenoid orthoesters is developed through a convergent synthetic strategy. The salient features include a diastereoselective nucleophilic assembly of two bulky cyclic fragments, an oxidative cleavage/transesterification/aldol cascade to fashion the seven-membered ring, and a base-mediated transesterification/retro-aldol/aldol/epoxidation cascade to install the epoxy moiety with proper stereochemistry.
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Affiliation(s)
- Ying Sun
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Jing Feng
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Song Qin
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Shaomin Fu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Bo Liu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
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3
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Daphnane Diterpenoids of Trigonostemon thyrsoideus. Chem Nat Compd 2022. [DOI: 10.1007/s10600-022-03844-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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4
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Affiliation(s)
- Shaomin Fu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University 29 Wangjiang Rd Chengdu Sichuan 610064 China
| | - Bo Liu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University 29 Wangjiang Rd Chengdu Sichuan 610064 China
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5
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Ng K, Khoury M, Minehan TG. Total Syntheses and Absolute Configuration Assignment of (+)-Sootepdienone, (-)-Jambolanin C, (-)-Jambolanin I, and (-) -Gibberodione. J Org Chem 2021; 86:3074-3080. [PMID: 33439018 DOI: 10.1021/acs.joc.0c02747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Total syntheses of the sesquiterpenes (+)-sootepdienone, (-)-jambolanin C, (-)-jambolanin I, and (-)-gibberodione have been accomplished in 10 steps each from R-(+)-pulegone, allowing assignment of the absolute configuration of the natural products. A key step in the synthetic pathways involves the one-carbon ring expansion of a cyclic allylic phosphonate to a substituted cycloheptenone by a tandem oxidative cleavage/intramolecular Horner-Wadsworth-Emmons reaction.
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Affiliation(s)
- Kevin Ng
- Department of Chemistry and Biochemistry, California State University, Northridge, 18111 Nordhoff Street, Northridge, California 91330, United States
| | - Michael Khoury
- Department of Chemistry and Biochemistry, California State University, Northridge, 18111 Nordhoff Street, Northridge, California 91330, United States
| | - Thomas Gerard Minehan
- Department of Chemistry and Biochemistry, California State University, Northridge, 18111 Nordhoff Street, Northridge, California 91330, United States
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6
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Chow S, Krainz T, Bettencourt CJ, Broit N, Ferguson B, Zhu M, Hull KG, Pierens GK, Bernhardt PV, Parsons PG, Romo D, Boyle GM, Williams CM. Synthetic Tigliane Intermediates Engage Thiols to Induce Potent Cell Line Selective Anti‐Cancer Activity. Chemistry 2020; 26:13372-13377. [DOI: 10.1002/chem.202003221] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 07/31/2020] [Indexed: 12/14/2022]
Affiliation(s)
- Sharon Chow
- School of Chemistry and Molecular Biosciences The University of Queensland Brisbane 4072 Queensland Australia
| | - Tanja Krainz
- School of Chemistry and Molecular Biosciences The University of Queensland Brisbane 4072 Queensland Australia
| | - Christian J. Bettencourt
- School of Chemistry and Molecular Biosciences The University of Queensland Brisbane 4072 Queensland Australia
| | - Natasa Broit
- QIMR Berghofer Medical Research Institute PO Royal Brisbane Hospital Brisbane 4029 Queensland Australia
| | - Blake Ferguson
- QIMR Berghofer Medical Research Institute PO Royal Brisbane Hospital Brisbane 4029 Queensland Australia
| | - Mingzhao Zhu
- Department of Chemistry and Biochemistry CPRIT Synthesis and Drug-Lead Discovery Laboratory) Baylor University 76798 Waco Texas USA
| | - Kenneth G. Hull
- Department of Chemistry and Biochemistry CPRIT Synthesis and Drug-Lead Discovery Laboratory) Baylor University 76798 Waco Texas USA
| | - Gregory K. Pierens
- Centre for Advanced Imaging The University of Queensland Brisbane 4072 Queensland Australia
| | - Paul V. Bernhardt
- School of Chemistry and Molecular Biosciences The University of Queensland Brisbane 4072 Queensland Australia
| | - Peter G. Parsons
- QIMR Berghofer Medical Research Institute PO Royal Brisbane Hospital Brisbane 4029 Queensland Australia
| | - Daniel Romo
- Department of Chemistry and Biochemistry CPRIT Synthesis and Drug-Lead Discovery Laboratory) Baylor University 76798 Waco Texas USA
| | - Glen M. Boyle
- QIMR Berghofer Medical Research Institute PO Royal Brisbane Hospital Brisbane 4029 Queensland Australia
| | - Craig M. Williams
- School of Chemistry and Molecular Biosciences The University of Queensland Brisbane 4072 Queensland Australia
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7
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Abstract
As a natural diterpenoid, crotophorbolone possesses a challenging trans,trans-5/7/6 framework decorated with six contiguous stereogenic centers and is structurally and biogenetically related to tigliane-type diterpenoids with intriguing bioactivities such as phorbol and prostratin. Based on the convergent strategy, we completed an eighteen-step total synthesis of crotophorbolone starting from (−)-carvone and (+)-dimethyl-2,3-O-isopropylidene-l-tartrate. The key elements of the synthesis involve expedient installation of the six-membered ring and the five-membered ring with multiple functional groups at an early stage, cyclization of the seven-membered ring through alkenylation of the ketone between the five-membered ring and the six-membered ring, functional group-sensitive ring-closing metathesis and final selective introduction of hydroxyls at C20 and C4. Convergent total synthesis of crotophorbolone was accomplished in 18 longest linear steps. Observation of unexpected thermodynamic stability of a cis,trans-5/7/6 tricycle would benefit synthetic design of tigliane- and daphnane-related diterpenoids.![]()
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Affiliation(s)
- Tianzi Yu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University 29 Wangjiang Rd. Chengdu Sichuan 610064 China
| | - Ying Sun
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University 29 Wangjiang Rd. Chengdu Sichuan 610064 China
| | - Canhui Tu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University 29 Wangjiang Rd. Chengdu Sichuan 610064 China
| | - Ting Chen
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University 29 Wangjiang Rd. Chengdu Sichuan 610064 China
| | - Shaomin Fu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University 29 Wangjiang Rd. Chengdu Sichuan 610064 China
| | - Bo Liu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University 29 Wangjiang Rd. Chengdu Sichuan 610064 China
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8
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Janicki I, Kiełbasiński P. Still–Gennari Olefination and its Applications in Organic Synthesis. Adv Synth Catal 2020. [DOI: 10.1002/adsc.201901591] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Ignacy Janicki
- Division of Organic ChemistryCentre of Molecular and Macromolecular Studies, Polish Academy of Sciences Sienkiewicza 112 90-363 Łódź Poland
| | - Piotr Kiełbasiński
- Division of Organic ChemistryCentre of Molecular and Macromolecular Studies, Polish Academy of Sciences Sienkiewicza 112 90-363 Łódź Poland
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9
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Ding Z, Liu Z, Tong G, Hu L, He Y, Bao Y, Lei Z, Zhang H, Li P. Facile synthesis of the daphnane and tigliane framework by semi-flow tube-based-bubbling photooxidation and diastereoselective conjugate addition. Org Chem Front 2020. [DOI: 10.1039/d0qo00424c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The common [5-7-6] tricyclic framework in tigliane and daphnane natural diterpenes containing five contiguous stereocenters has been synthesized in 9 steps from readily available starting materials in a completely stereocontrolled manner.
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Affiliation(s)
- Zhengwei Ding
- Frontier Institute of Science and Technology
- Xi'an Jiaotong University
- Xi'an
- China
| | - Zhi Liu
- Frontier Institute of Science and Technology
- Xi'an Jiaotong University
- Xi'an
- China
| | - Guanghu Tong
- Frontier Institute of Science and Technology
- Xi'an Jiaotong University
- Xi'an
- China
| | - Linlin Hu
- Department of Applied Chemistry
- Xi'an University of Technology
- Xi'an 710048
- China
| | - Yangqing He
- Department of Applied Chemistry
- Xi'an University of Technology
- Xi'an 710048
- China
| | - Yueyun Bao
- Frontier Institute of Science and Technology
- Xi'an Jiaotong University
- Xi'an
- China
| | - Zhouhang Lei
- Frontier Institute of Science and Technology
- Xi'an Jiaotong University
- Xi'an
- China
| | - Hailong Zhang
- Department of Medicinal Chemistry
- School of Pharmacy
- Xi'an Jiaotong University
- Xi'an
- China
| | - Pengfei Li
- Frontier Institute of Science and Technology
- Xi'an Jiaotong University
- Xi'an
- China
- Xi'an Key Laboratory of Sustainable Energy Materials Chemistry
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Chow S, Krainz T, Bernhardt PV, Williams CM. En Route to D-Ring Inverted Phorbol Esters. Org Lett 2019; 21:8761-8764. [DOI: 10.1021/acs.orglett.9b03379] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Sharon Chow
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, 4072, Australia
| | - Tanja Krainz
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, 4072, Australia
| | - Paul V. Bernhardt
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, 4072, Australia
| | - Craig M. Williams
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, 4072, Australia
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12
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Ganiu MO, Cleveland AH, Paul JL, Kartika R. Triphosgene and DMAP as Mild Reagents for Chemoselective Dehydration of Tertiary Alcohols. Org Lett 2019; 21:5611-5615. [PMID: 31251637 DOI: 10.1021/acs.orglett.9b01959] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The utility of triphosgene and DMAP as mild reagents for chemoselective dehydration of tertiary alcohols is reported. Performed in dichloromethane at room temperature, this reaction is readily tolerated by a broad scope of substrates, yielding alkenes preferentially with the (E)-geometry. While formation of the Hofmann products is generally favored, a dramatic change in alkene selectivity toward the Zaitzev products is observed when the reaction is carried out in dichloroethane at reflux.
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Affiliation(s)
- Moshood O Ganiu
- Department of Chemistry , Louisiana State University , 232 Choppin Hall , Baton Rouge , Louisiana 70803 , United States
| | - Alexander H Cleveland
- Department of Chemistry , Louisiana State University , 232 Choppin Hall , Baton Rouge , Louisiana 70803 , United States
| | - Jarrod L Paul
- Department of Chemistry , Louisiana State University , 232 Choppin Hall , Baton Rouge , Louisiana 70803 , United States
| | - Rendy Kartika
- Department of Chemistry , Louisiana State University , 232 Choppin Hall , Baton Rouge , Louisiana 70803 , United States
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13
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