1
|
Wang M, Jia Y, Wu F, Li Z, Shao L, Chen X. Asymmetric synthesis of penostatins A-D from L-ascorbic acid. Org Biomol Chem 2024; 22:7649-7658. [PMID: 39190450 DOI: 10.1039/d4ob01186d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/28/2024]
Abstract
The first asymmetric synthesis of (-)-penostatins B and D and the practical synthesis of (+)-penostatins A and C have been accomplished through a flexible strategy. The features of the synthesis are a BF3·OEt2-mediated Diels-Alder reaction of chiral dienophiles and methylcyclopentadienes with high chemo-, regio-, and stereoselectivity, followed by ozonolysis to install the common trisubstituted cyclopentane intermediate, and a hetero-Diels-Alder reaction with easily tunable facial selectivity, followed by sulfonate elimination to construct both enantiomeric tricyclic systems for penostatins A/C and B/D, respectively.
Collapse
Affiliation(s)
- Maolin Wang
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, PR China.
| | - Yuanliang Jia
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, PR China.
| | - Folei Wu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, PR China.
| | - Zupei Li
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, PR China.
| | - Lijun Shao
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, PR China.
| | - Xiaochuan Chen
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, PR China.
| |
Collapse
|
2
|
Yu M, Huang J, Zhu H, Shi D, Yang W, Liu Y, Ji Y, Fu Z. Facile construction of 2-pyrones under carbene catalysis. RSC Adv 2024; 14:28585-28595. [PMID: 39247504 PMCID: PMC11378031 DOI: 10.1039/d4ra05596a] [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: 08/01/2024] [Accepted: 09/02/2024] [Indexed: 09/10/2024] Open
Abstract
2-Pyrones are valuable structural motifs in organic chemistry, found in numerous natural products and pharmaceuticals. The synthesis of these heterocycles has been significantly advanced by the application of N-Heterocyclic Carbene (NHC) catalysis. This review examines the recent advancements in NHC-catalyzed synthesis of 2-pyrones, highlighting key methodologies, mechanisms, and synthetic applications. NHC catalysis has revolutionized the synthesis of 2-pyrones, providing efficient, selective, and versatile methods for constructing these valuable heterocycles.
Collapse
Affiliation(s)
- Miao Yu
- Engineering Research Center for Medicine, Ministry of Education, Harbin University of Commerce Harbin 150076 China
| | - Jie Huang
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering & Institute of Advanced Materials, Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Haibin Zhu
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering & Institute of Advanced Materials, Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Dongping Shi
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering & Institute of Advanced Materials, Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Weiqi Yang
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering & Institute of Advanced Materials, Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| | - Yingjie Liu
- Engineering Research Center for Medicine, Ministry of Education, Harbin University of Commerce Harbin 150076 China
| | - Yubin Ji
- Engineering Research Center for Medicine, Ministry of Education, Harbin University of Commerce Harbin 150076 China
| | - Zhenqian Fu
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering & Institute of Advanced Materials, Nanjing Tech University 30 South Puzhu Road Nanjing 211816 China
| |
Collapse
|
3
|
Spieß P, Matheu SA, Bauer A, Coussanes G, Shaaban S, Maulide N. Ni-Catalyzed Stereoconvergent Reductive Dimerization of Bromocyclobutenes. Org Lett 2024; 26:355-359. [PMID: 38147458 PMCID: PMC10789092 DOI: 10.1021/acs.orglett.3c03909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 12/18/2023] [Accepted: 12/20/2023] [Indexed: 12/28/2023]
Abstract
A nickel-catalyzed reductive dimerization of bromocyclobutenes to produce unusual and unprecedented cyclobutene dimers was developed. In a stereoconvergent procedure, various bromocyclobutenes were readily dimerized in good yields, with good diastereoselectivities and broad functional group tolerance. Notably, the presence of a carbonyl group in the starting material appears to dictate diastereoselectivity.
Collapse
Affiliation(s)
| | | | - Adriano Bauer
- Institute of Organic Chemistry, University of Vienna, Währinger Straße 38, 1090 Vienna, Austria
| | - Guilhem Coussanes
- Institute of Organic Chemistry, University of Vienna, Währinger Straße 38, 1090 Vienna, Austria
| | - Saad Shaaban
- Institute of Organic Chemistry, University of Vienna, Währinger Straße 38, 1090 Vienna, Austria
| | - Nuno Maulide
- Institute of Organic Chemistry, University of Vienna, Währinger Straße 38, 1090 Vienna, Austria
| |
Collapse
|
4
|
Jia Y, Wang M, Wu F, Chen X. Enantioselective Total Synthesis of (+)-Penostatins A and C. Org Lett 2023; 25:1941-1945. [PMID: 36926890 DOI: 10.1021/acs.orglett.3c00485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
Abstract
A stereoselective and column-economic approach to (+)-penostatins A and C has been developed. The multisubstituted A ring and B/C rings in their unique tricyclic framework are constructed through a Diels-Alder reaction/ozonolysis sequence and an exo intramolecular hetero-Diels-Alder reaction with high chemo-, regio-, and stereoselectivity. Using this route, (+)-penostatins A and C can be synthesized in 19 and 20 steps, respectively, with a good overall yield involving only five or six column chromatographic purifications.
Collapse
Affiliation(s)
- Yuanliang Jia
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People's Republic of China
| | - Maolin Wang
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People's Republic of China
| | - Folei Wu
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People's Republic of China
| | - Xiaochuan Chen
- Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People's Republic of China
| |
Collapse
|
5
|
Nalawade SA, Singh M, Puneeth Kumar DRGKR, Dey S, Gopi HN. Stereoselective synthesis of backbone extended π-conjugated amino esters. Org Biomol Chem 2023; 21:2586-2595. [PMID: 36880876 DOI: 10.1039/d3ob00090g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2023]
Abstract
Utilization of the Wittig reaction to synthesize conjugative multiple double bonds is rare. We examined the utility of the Wittig reaction to construct conjugative two and three carbon-carbon double bonds on the N-protected amino acid backbone. The ethyl esters of N-Boc amino acids with multiple carbon-carbon double bonds in the backbone were isolated in excellent yields with exceptional E-selectivity of the double bonds. The allylic alcohols of α,β-unsaturated γ-amino esters were selectively synthesized from the DIBAL-H and BF3·OEt2. The allylic alcohols were transformed into aldehydes using IBX oxidation. Using this protocol, we synthesized ethyl esters of N-Boc-(E,E)-α,β,γ,δ-unsaturated ε-amino acids with various side-chain functionalities and ethyl esters of N-Boc-(E,E,E)-α,β,γ,δ,ε,ζ-unsaturated η-amino acids with excellent yields. We speculated the exceptional E-selectivity is probably due to the stabilization of the planar transition state of the Wittig reaction with the double bond p-orbitals. No racemization was observed in the synthesis of amino acids. The reported process may serve as an excellent route to synthesize multiple conjugative carbon-carbon double bonds.
Collapse
Affiliation(s)
- Sachin A Nalawade
- Department of Chemistry, Indian Institute of Science Education and Research, Dr Homi Bhabha Road, Pashan, Pune-411 008, India.
| | - Manjeet Singh
- Department of Chemistry, Indian Institute of Science Education and Research, Dr Homi Bhabha Road, Pashan, Pune-411 008, India.
| | - DRGKoppalu R Puneeth Kumar
- Department of Chemistry, Indian Institute of Science Education and Research, Dr Homi Bhabha Road, Pashan, Pune-411 008, India.
| | - Sanjit Dey
- Department of Chemistry, Indian Institute of Science Education and Research, Dr Homi Bhabha Road, Pashan, Pune-411 008, India.
| | - Hosahudya N Gopi
- Department of Chemistry, Indian Institute of Science Education and Research, Dr Homi Bhabha Road, Pashan, Pune-411 008, India.
| |
Collapse
|
6
|
Bi T, Xu Y, Xu X, Tang B, Yang Q, Zang Y, Lin Z, Li J, Yang W. Natural scaffolds-inspired synthesis of CF3-substituted macrolides enabled by Rh-catalyzed C–H alkylation macrocyclization. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2021.10.043] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
|
7
|
Dethe DH, Kumar V, Beeralingappa NC, Mishra KB, Nirpal AK. Synthesis of Polyene Bioactive Natural Products: FR252921 and Vitamin A. Org Lett 2022; 24:2203-2207. [PMID: 35274951 DOI: 10.1021/acs.orglett.2c00546] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A formal synthesis of FR252921, a potent macrocyclic immunosuppressive agent, and a six-step synthesis of vitamin A have been demonstrated. The application of a ruthenium-catalyzed step-economic and environmentally benign strategy for the highly stereo- and chemoselective construction of valuable polyene motifs of FR252921 and vitamin A highlights the syntheses. The key features for the synthesis FR252921 include preparation of the triene moiety followed by two consecutive peptide couplings of the three fragments.
Collapse
Affiliation(s)
- Dattatraya H Dethe
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Vimlesh Kumar
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | | | - Kunj B Mishra
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Appasaheb K Nirpal
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
| |
Collapse
|
8
|
One-pot synthesis of cyclobutenecarboxylate derivatives via olefinic C-F bond functionalization of gem-difluoroalkenes. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.153673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
9
|
Dobler D, Leitner M, Moor N, Reiser O. 2‐Pyrone – A Privileged Heterocycle and Widespread Motif in Nature. European J Org Chem 2021. [DOI: 10.1002/ejoc.202101112] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Daniel Dobler
- Institut für Organische Chemie Universität Regensburg Universitätsstr. 31 93053 Regensburg Germany
| | - Michael Leitner
- Institut für Organische Chemie Universität Regensburg Universitätsstr. 31 93053 Regensburg Germany
| | - Natalija Moor
- Institut für Organische Chemie Universität Regensburg Universitätsstr. 31 93053 Regensburg Germany
| | - Oliver Reiser
- Institut für Organische Chemie Universität Regensburg Universitätsstr. 31 93053 Regensburg Germany
| |
Collapse
|
10
|
Li Y, Hao M, Chang Y, Liu Y, Wang W, Sun N, Zhu W, Gao Z. Synthesis of
4‐Trifluoromethylated
1,
3‐Butadienes
via Palladium Catalyzed Heck Reaction. CHINESE J CHEM 2021. [DOI: 10.1002/cjoc.202100313] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yang Li
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries School of Environmental and Chemical Engineering Xi'an Polytechnic University Xi'an Shaanxi 710048 China
| | - Meng Hao
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries School of Environmental and Chemical Engineering Xi'an Polytechnic University Xi'an Shaanxi 710048 China
| | - Yu‐Chen Chang
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries School of Environmental and Chemical Engineering Xi'an Polytechnic University Xi'an Shaanxi 710048 China
| | - Yuan Liu
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries School of Environmental and Chemical Engineering Xi'an Polytechnic University Xi'an Shaanxi 710048 China
| | - Wen‐Fei Wang
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries School of Environmental and Chemical Engineering Xi'an Polytechnic University Xi'an Shaanxi 710048 China
| | - Ning Sun
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries School of Environmental and Chemical Engineering Xi'an Polytechnic University Xi'an Shaanxi 710048 China
| | - Wen‐Qing Zhu
- Xi'an Key Laboratory of Textile Chemical Engineering Auxiliaries School of Environmental and Chemical Engineering Xi'an Polytechnic University Xi'an Shaanxi 710048 China
| | - Ziwei Gao
- School of Chemistry & Chemical Engineering Yan'an University, Yan'an Shaanxi 716000 China
- Xinjiang Normal University Urumchi Xinjiang 650100 China
| |
Collapse
|
11
|
Patel SC, Smith MW, Mercer JAM, Suzuki K, Burns NZ. Enantioselective Cyclobutenylation of Olefins Using N-Sulfonyl-1,2,3-Triazoles as Vicinal Dicarbene Equivalents. Org Lett 2021; 23:6530-6535. [PMID: 34374544 DOI: 10.1021/acs.orglett.1c02331] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cyclobutenes are highly useful synthetic intermediates as well as important motifs in bioactive small molecules. Herein, we report a regio-, chemo-, and enantioselective synthesis of cyclobutenes from olefins using N-sulfonyl-1,2,3-triazoles as vicinal dicarbene equivalents or alkyne [2 + 2] cycloaddition surrogates. Terminal and cis-olefins can be transformed into enantioenriched cyclopropanes via rhodium catalysis. Then, in one pot, treatment of these intermediates with tosyl hydrazide and base effects diazo formation followed by rhodium-catalyzed ring expansion to yield enantioenriched cyclobutenes. These cyclobutenes can be transformed into highly substituted, enantioenriched cyclobutanes, including structures relevant to natural product scaffolds.
Collapse
Affiliation(s)
- Sajan C Patel
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Myles W Smith
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Jaron A M Mercer
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Kensuke Suzuki
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Noah Z Burns
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| |
Collapse
|
12
|
|
13
|
Wan LX, Zhen YQ, He ZX, Zhang Y, Zhang L, Li X, Gao F, Zhou XL. Late-Stage Modification of Medicine: Pd-Catalyzed Direct Synthesis and Biological Evaluation of N-Aryltacrine Derivatives. ACS OMEGA 2021; 6:9960-9972. [PMID: 33869976 PMCID: PMC8047743 DOI: 10.1021/acsomega.1c01404] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Accepted: 03/29/2021] [Indexed: 05/13/2023]
Abstract
A new series of N-aryltacrine derivatives were designed and synthesized as cholinesterase inhibitors by the late-stage modification of tacrine, using the palladium-catalyzed Buchwald-Hartwig cross-coupling reaction. In vitro inhibition assay against acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE) demonstrated that most of the synthesized compounds had potent AChE inhibitory activity with negative inhibition of BuChE. Among them, N-(4-(trifluoromethyl)phenyl)-tacrine (3g) and N-(4-methoxypyridin-2-yl)-tacrine (3o) showed the most potent activity against AChE (IC50 values of 1.77 and 1.48 μM, respectively). The anti-AChE activity of 3g and 3o was 3.5 times more than that of tacrine (IC50 value of 5.16 μM). Compound 3o also displayed anti-BuChE activity with an IC50 value of 19.00 μM. Cell-based assays against HepG2 and SH-SY5Y cell lines revealed that 3o had significantly lower hepatotoxicity compared to tacrine, with additional neuroprotective activity against H2O2-induced damage in SH-SY5Y cells. The advantages including synthetic accessibility, high potency, low toxicity, and adjunctive neuroprotective activity make compound 3o a new promising multifunctional candidate for the treatment of Alzheimer's disease.
Collapse
|
14
|
Kazemnejadi M, Ahmed RO, Mahmoudi B. Ni/Pd-catalyzed Suzuki-Miyaura cross-coupling of alcohols and aldehydes and C-N cross-coupling of nitro and amines via domino redox reactions: base-free, hydride acceptor-free. RSC Adv 2020; 10:43962-43974. [PMID: 35517161 PMCID: PMC9058410 DOI: 10.1039/d0ra08344e] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Accepted: 11/18/2020] [Indexed: 02/04/2023] Open
Abstract
Domino oxidation-Suzuki-Miyaura cross-coupling of benzyl alcohols with phenylboronic acid and domino reduction-C-N cross-coupling of the nitro compounds with aryl halides were carried out using a strong Ni/Pd bimetallic redox catalyst. The catalyst bearing a copolymer with two Ni/Pd coordinated metals in porphyrin (derived from demetalated chlorophyll b) and salen-type ligands, and pyridine moiety as a base functionality all immobilized on magnetite NPs was synthesised and characterized. The domino oxidation cross-coupling reaction was accomplished under molecular O2 in the absence of any hydride acceptor or/and base. Also, the domino reduction C-N cross-coupling reaction was performed in the presence of NaBH4 without the need for any base and co-reductant. This multifunctional catalyst gave moderate to good yields for both coupling reactions with high chemoselectivity. A wide investigation was conducted to determine its mechanism and chemoselectivity.
Collapse
Affiliation(s)
- Milad Kazemnejadi
- Department of Chemistry, College of Science, Shiraz University Shiraz 7194684795 Iran
| | | | - Boshra Mahmoudi
- Research Center, Sulaimani Polytechnic University Sulaimani Iraq
| |
Collapse
|
15
|
Saridakis I, Kaiser D, Maulide N. Unconventional Macrocyclizations in Natural Product Synthesis. ACS CENTRAL SCIENCE 2020; 6:1869-1889. [PMID: 33274267 PMCID: PMC7706100 DOI: 10.1021/acscentsci.0c00599] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Indexed: 06/12/2023]
Abstract
Over the past several decades, macrocyclic compounds have emerged as increasingly significant therapeutic candidates in drug discovery. Their pharmacological activity hinges on their rotationally restricted three-dimensional orientation, resulting in a unique conformational preorganization and a high enthalpic gain as a consequence of high-affinity macrocycle-protein binding interactions. Synthetic access to macrocyclic drug candidates is therefore crucial. From a synthetic point of view, the efficiency of macrocyclization events commonly suffers from entropic penalties as well as undesired intermolecular couplings (oligomerization). Although over the past several decades ring-closing metathesis, macrolactonization, or macrolactamization have become strategies of choice, the toolbox of organic synthesis provides a great number of versatile transformations beyond the aforementioned. This Outlook focuses on a selection of examples employing what we term unconventional macrocyclizations toward the synthesis of natural products or analogues.
Collapse
Affiliation(s)
- Iakovos Saridakis
- Institute
of Organic Chemistry, University of Vienna, Währinger Strasse 38, 1090 Vienna, Austria
| | - Daniel Kaiser
- Institute
of Organic Chemistry, University of Vienna, Währinger Strasse 38, 1090 Vienna, Austria
| | - Nuno Maulide
- Institute
of Organic Chemistry, University of Vienna, Währinger Strasse 38, 1090 Vienna, Austria
- Research
Platform for Next Generation Macrocycles, Währinger Strasse 38, 1090 Vienna, Austria
| |
Collapse
|
16
|
Nistanaki SK, Nelson HM. Dewar Heterocycles as Versatile Monomers for Ring-Opening Metathesis Polymerization. ACS Macro Lett 2020; 9:731-735. [PMID: 34306822 DOI: 10.1021/acsmacrolett.0c00227] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
We report the utility of readily available heterocycles as precursors to unique ring-opening metathesis polymerization (ROMP) monomers. Photochemical valence isomerization reactions of pyridones, dihydropyridines, and pyrones dearomatize the parent heterocycles to their highly strained Dewar isomers, which readily engage in controlled ROMP reactions using Grubbs catalysts. This strategy is used to access polymer backbones that contain strained β-lactam and azetidine cores, which can be further derivatized using post-polymerization chemistries. We demonstrate this through the synthesis of water-soluble β-amino acid polymers that have potential applications as biomedical materials, along with the synthesis of highly-soluble poly(acetylene) derivatives, which have potential applications as organic conductive materials derived from bio-feedstock chemicals.
Collapse
Affiliation(s)
- Sepand K Nistanaki
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Hosea M Nelson
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| |
Collapse
|
17
|
Lou SJ, Li XH, Zhou XL, Fang DM, Gao F. Palladium-Catalyzed Synthesis and Anticancer Activity of Paclitaxel-Dehydroepiandrosterone Hybrids. ACS OMEGA 2020; 5:5589-5600. [PMID: 32201853 PMCID: PMC7081646 DOI: 10.1021/acsomega.0c00558] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 02/26/2020] [Indexed: 05/28/2023]
Abstract
According to the activity-structure relationship of the C-13 side chain in paclitaxel or docetaxel, eighteen novel paclitaxel-dehydroepiandrosterone (DHEA) hybrids were designed and synthesized by Pd(II)-catalyzed Suzuki-Miyaura cross-coupling of 17-trifluoromethanesulfonic enolate-DHEA with different aryl boronic acids. The in vitro anticancer activity of the hybrids against a human liver cancer cell line (HepG-2) was evaluated by MTT assay, showing that most of these hybrids possessed moderate antiproliferative activity against the HepG-2 cancer cell line. Among these hybrids, three ones (7b, 7g, and 7i) with ortho-substituents in the phenyl group of the D-ring of DHEA analogues exhibited moderate anticancer activity. The optimal compound 7i showed superior anticancer activity against the HepG-2 cell line with an IC50 value of 26.39 μM.
Collapse
Affiliation(s)
- Sheng-Jie Lou
- School
of Life Science and Engineering, Southwest
Jiaotong University, No. 111, Erhuan Road, Chengdu 610031, PR China
| | - Xiao-Huan Li
- School
of Life Science and Engineering, Southwest
Jiaotong University, No. 111, Erhuan Road, Chengdu 610031, PR China
| | - Xian-Li Zhou
- School
of Life Science and Engineering, Southwest
Jiaotong University, No. 111, Erhuan Road, Chengdu 610031, PR China
| | - Dong-Mei Fang
- Chengdu
Institute of Biology, Chinese Academy of
Sciences, No. 9, Section
4, South Renmin Road, Chengdu 610041, PR China
| | - Feng Gao
- School
of Life Science and Engineering, Southwest
Jiaotong University, No. 111, Erhuan Road, Chengdu 610031, PR China
| |
Collapse
|