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Begum AF, Balasubramanian KK, Bhagavathy S. 3‐Arylidene‐4‐Chromanones and 3‐arylidene‐4‐thiochromanones: Versatile Synthons towards the Synthesis of Complex Heterocycles. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200328] [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)
- Ayisha F Begum
- B S Abdur Rahman Crescent Institute of Science & Technology Chemistry 600048 Chennai INDIA
| | | | - Shanmugasundaram Bhagavathy
- B S Abdur Rahman Crescent Institute of Science & Technology Chemistry Seethakathi EstateVandalur 600048 Chennai INDIA
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2
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Zhu R, Zhang Y, Yang J, Yang Y, Xue Y. Computational insight into the mechanism and origin of high regioselectivity in the ring-opening cyclization of spirocyclopropanes with stabilized sulfonium ylides by the DFT. J Mol Model 2020; 26:255. [PMID: 32876902 DOI: 10.1007/s00894-020-04522-1] [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: 05/22/2020] [Accepted: 08/26/2020] [Indexed: 11/29/2022]
Abstract
Chromanes with high bioactivity play an important role in nature, and cyclization reactions of cyclopropanes with sulfonium ylides to form chromane skeletons have attracted great attention of scientists. The mechanism as well as origins of regioselectivity and stereoselectivity for the ring-opening/cyclization reactions between cyclohexane-1,3-dione-2-spirocyclopropanes and stabilized sulfonium ylides in CH2Cl2 were investigated by using the density functional theory (DFT) M06-2X/6-311+G(d,p)//M06-2X/6-31G(d,p) method combined with the SMD model. The calculated results revealed that the reaction process involved two key steps: the ring-opening step and the cyclization step, with the former being the rate-determining and stereoselectivity-determining step. The regioselectivity of the ring-opening step of spirocyclopropane indicated that the tertiary carbon was more preferential than the secondary one when sulfonium ylide attacked spirocyclopropane. The theoretical results confirmed that the stereoselectivity of the reaction to form the trans-isomer product is more favorable than the cis-isomer, and the calculated trans/cis ratio is in accordance with the experiment. Moreover, the conceptual density functional theory reactivity indices suggest that the electronic effect controls the regioselectivity. What is more, the stereoselectivity analyzed by weak non-covalent interaction also shows the importance of electronic effect. Graphical Abstract.
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Affiliation(s)
- Ruyu Zhu
- Key Lab of Green Chemistry and Technology in Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, People's Republic of China
| | - Yan Zhang
- Key Lab of Green Chemistry and Technology in Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, People's Republic of China
| | - Junxia Yang
- Key Lab of Green Chemistry and Technology in Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, People's Republic of China
| | - Yongsheng Yang
- Key Lab of Green Chemistry and Technology in Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, People's Republic of China
| | - Ying Xue
- Key Lab of Green Chemistry and Technology in Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, People's Republic of China.
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3
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McCowen SV, Doering NA, Sarpong R. Retrosynthetic strategies and their impact on synthesis of arcutane natural products. Chem Sci 2020; 11:7538-7552. [PMID: 33552460 PMCID: PMC7860588 DOI: 10.1039/d0sc01441a] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Accepted: 04/20/2020] [Indexed: 01/18/2023] Open
Abstract
Decisions, decisions, decisions: the interplay between different retrosynthetic strategies in the synthesis of the highly bridged, polycyclic arcutane natural products.
Retrosynthetic analysis is a cornerstone of modern natural product synthesis, providing an array of tools for disconnecting structures. However, discussion of retrosynthesis is often limited to the reactions used to form selected bonds in the forward synthesis. This review details three strategies for retrosynthesis, focusing on how they can be combined to plan the synthesis of polycyclic natural products, such as atropurpuran and the related arcutane alkaloids. Recent syntheses of natural products containing the arcutane framework showcase how these strategies for retrosynthesis can be combined to plan the total synthesis of highly caged scaffolds. Comparison of multiple syntheses of the same target provides a unique opportunity for detailed analysis of the impact of retrosynthetic disconnections on synthesis outcomes.
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Affiliation(s)
- Shelby V McCowen
- Department of Chemistry , University of California , Berkeley , California 94720 , USA .
| | - Nicolle A Doering
- Department of Chemistry , University of California , Berkeley , California 94720 , USA .
| | - Richmond Sarpong
- Department of Chemistry , University of California , Berkeley , California 94720 , USA .
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4
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Walsh DJ, Livinghouse T, Goeres DM, Mettler M, Stewart PS. Antimicrobial Activity of Naturally Occurring Phenols and Derivatives Against Biofilm and Planktonic Bacteria. Front Chem 2019; 7:653. [PMID: 31632948 PMCID: PMC6779693 DOI: 10.3389/fchem.2019.00653] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Accepted: 09/11/2019] [Indexed: 12/28/2022] Open
Abstract
Biofilm-forming bacteria present formidable challenges across diverse settings, and there is a need for new antimicrobial agents that are both environmentally acceptable and relatively potent against microorganisms in the biofilm state. The antimicrobial activity of three naturally occurring, low molecular weight, phenols, and their derivatives were evaluated against planktonic and biofilm Staphylococcus epidermidis and Pseudomonas aeruginosa. The structure activity relationships of eugenol, thymol, carvacrol, and their corresponding 2- and 4-allyl, 2-methallyl, and 2- and 4-n-propyl derivatives were evaluated. Allyl derivatives showed a consistent increased potency with both killing and inhibiting planktonic cells but they exhibited a decrease in potency against biofilms. This result underscores the importance of using biofilm assays to develop structure-activity relationships when the end target is biofilm.
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Affiliation(s)
- Danica J. Walsh
- Chemistry and Biochemistry, Montana State University, Bozeman, MT, United States
- Center for Biofilm Engineering, Montana State University, Bozeman, MT, United States
| | - Tom Livinghouse
- Chemistry and Biochemistry, Montana State University, Bozeman, MT, United States
| | - Darla M. Goeres
- Center for Biofilm Engineering, Montana State University, Bozeman, MT, United States
| | - Madelyn Mettler
- Center for Biofilm Engineering, Montana State University, Bozeman, MT, United States
| | - Philip S. Stewart
- Center for Biofilm Engineering, Montana State University, Bozeman, MT, United States
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5
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Nie W, Gong J, Chen Z, Liu J, Tian D, Song H, Liu XY, Qin Y. Enantioselective Total Synthesis of (−)-Arcutinine. J Am Chem Soc 2019; 141:9712-9718. [PMID: 31136168 DOI: 10.1021/jacs.9b04847] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Wei Nie
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, P.R. China
| | - Jing Gong
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, P.R. China
| | - Zhihao Chen
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, P.R. China
| | - Jiazhen Liu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, P.R. China
| | - Di Tian
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, P.R. China
| | - Hao Song
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, P.R. China
| | - Xiao-Yu Liu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, P.R. China
| | - Yong Qin
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Sichuan Engineering Laboratory for Plant-Sourced Drug and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, P.R. China
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6
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Yazdani-Elah-Abadi A, Simin N, Morekian R, Heydari-Dahoei H. Microwave-Promoted Facile and Rapid Access to Novel Spirooxindole-furo[2,3-c]pyrazole Derivatives Using Pyridinium Ylide-Assisted Domino Reaction. Polycycl Aromat Compd 2019. [DOI: 10.1080/10406638.2019.1570948] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
| | - Nasim Simin
- Department of Chemistry, Islamic Azad University, Tuyserkan, Iran
| | - Reza Morekian
- Department of Food Industry Engineering, Science and Arts University, Yazd, Iran
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7
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Qiu JK, Hao WJ, Li G, Jiang B. Oxidative Catalytic Spiroketalization Leading to Diastereoselective Synthesis of Spiro[benzofuran-2,1′-isochromene]s. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201701149] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Jiang-Kai Qiu
- Institute of Chemistry & BioMedical Sciences; Nanjing University; Nanjing 210023 People's Republic of China
- Department of Chemistry and Biochemistry; Texas Tech University; Lubbock, Texas 79409-1061 United States
| | - Wen-Juan Hao
- School of Chemistry and Material Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials; Jiangsu Normal University; Xuzhou 211116 People's Republic of China
| | - Guigen Li
- Institute of Chemistry & BioMedical Sciences; Nanjing University; Nanjing 210023 People's Republic of China
- Department of Chemistry and Biochemistry; Texas Tech University; Lubbock, Texas 79409-1061 United States
| | - Bo Jiang
- Department of Chemistry and Biochemistry; Texas Tech University; Lubbock, Texas 79409-1061 United States
- School of Chemistry and Material Science, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials; Jiangsu Normal University; Xuzhou 211116 People's Republic of China
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Huang J, Wang W, He HY, Jian L, Fu HY, Zheng XL, Chen H, Li RX. An Approach to the Synthesis of 1-Propenylnaphthols and 3-Arylnaphtho[2,1-b]furans. J Org Chem 2017; 82:2523-2534. [PMID: 28165232 DOI: 10.1021/acs.joc.6b02902] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A simple and efficient strategy for the synthesis of 1-propenylnaphthols from readily accessible 3-arylallylnaphthyl ethers has been developed. By using K2CO3 as base and 2-methoxyethanol as solvent, direct access to a wide range of 1-propenylnaphthols can be achieved in generally good yield (up to 99%) with high stereoselectivity toward the Z isomer. The control experiments indicate that the reaction proceeds through a sequential Claisen rearrangement/isomerization process. Furthermore, starting from the same material, the highly valuable 3-arylnaphtho[2,1-b]furans can be obtained in N,N-dimethylformamide and in the presence of Ag2O as the oxidant via a one-pot sequential Claisen rearrangement/isomerization/cyclization reaction. Mechanistic studies confirm that 1-propenylnaphthols are the key intermediates to form the 3-arylnaphtho[2,1-b]furans. In addition, these two operationally simple and practical protocols could be scaled up to a gram level.
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Affiliation(s)
- Jin Huang
- Key Lb of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University , Chengdu 610064, People's Republic of China
| | - Wei Wang
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University , Chengdu 610064, People's Republic of China
| | - Hai-Yu He
- Key Lb of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University , Chengdu 610064, People's Republic of China
| | - Lei Jian
- Key Lb of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University , Chengdu 610064, People's Republic of China
| | - Hai-Yan Fu
- Key Lb of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University , Chengdu 610064, People's Republic of China
| | - Xue-Li Zheng
- Key Lb of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University , Chengdu 610064, People's Republic of China
| | - Hua Chen
- Key Lb of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University , Chengdu 610064, People's Republic of China
| | - Rui-Xiang Li
- Key Lb of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University , Chengdu 610064, People's Republic of China
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9
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Hu YJ, Wang XB, Li SY, Xie SS, Wang KD, Kong LY. Facile synthesis of spiro chromanone-tetrahydrothiophenes with three contiguous stereocenters via sulfa-Michael/aldol cascade reactions. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2014.11.026] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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10
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Jayaprakash SH, Krishna BS, Prasad SS, Sudha SS, Reddy CS. Sodium Perborate: A Facile Catalyst for Allylation of Active Centers. SYNTHETIC COMMUN 2014. [DOI: 10.1080/00397911.2014.963874] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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11
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Schünemann K, Furkert DP, Connelly S, Fraser JD, Sperry J, Brimble MA. Synthesis and Biological Evaluation of 7-Deoxy Analogues of the Human Rhinovirus 3C Protease Inhibitor Thysanone. European J Org Chem 2013. [DOI: 10.1002/ejoc.201301515] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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12
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Wang X, Guo P, Wang X, Wang Z, Ding K. Practical Asymmetric Catalytic Synthesis of Spiroketals and Chiral Diphosphine Ligands. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201300380] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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13
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Wang W, Xue J, Tian T, Zhang J, Wei L, Shao J, Xie Z, Li Y. Total synthesis of (±)-δ-rubromycin. Org Lett 2013; 15:2402-5. [PMID: 23635026 DOI: 10.1021/ol400864f] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Transition-metal-catalyzed spiroketalization cyclization has been performed successfully and has led to the first total synthesis of (±)-δ-rubromycin with a longest linear sequence of 18 steps from commercially available guaiacol in a 2.7% overall yield.
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Affiliation(s)
- Wenjing Wang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University , Lanzhou 730000, Gansu, P. R. China
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14
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Aitken HRM, Furkert DP, Hubert JG, Wood JM, Brimble MA. Enantioselective access to benzannulated spiroketals using a chiral sulfoxide auxiliary. Org Biomol Chem 2013; 11:5147-55. [DOI: 10.1039/c3ob41065j] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Sajna KV, Kumara Swamy KC. Allenylphosphonates/Allenylphosphine Oxides as Intermediates/Precursors for Intramolecular Cyclization Leading to Phosphorus-Based Indenes, Indenones, Benzofurans, and Isochromenes. J Org Chem 2012; 77:5345-56. [DOI: 10.1021/jo300705f] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- K. V. Sajna
- School
of Chemistry, University of Hyderabad, Hyderabad 500
046, A. P., India
| | - K. C. Kumara Swamy
- School
of Chemistry, University of Hyderabad, Hyderabad 500
046, A. P., India
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Li X, Xue J, Huang C, Li Y. Copper(I)-Catalyzed Hydroalkoxylation/Hydrogen-Bonding-Induced Asymmetric Hetero-Diels-Alder Cycloaddition Cascade: An Approach to Aromatic Spiroketals. Chem Asian J 2012; 7:903-6. [DOI: 10.1002/asia.201101056] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2011] [Indexed: 11/10/2022]
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17
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Wang X, Han Z, Wang Z, Ding K. Catalytic Asymmetric Synthesis of Aromatic Spiroketals by SpinPhox/Iridium(I)-Catalyzed Hydrogenation and Spiroketalization of α,α′-Bis(2-hydroxyarylidene) Ketones. Angew Chem Int Ed Engl 2011; 51:936-40. [DOI: 10.1002/anie.201106488] [Citation(s) in RCA: 208] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2011] [Indexed: 11/06/2022]
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18
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Wang X, Han Z, Wang Z, Ding K. Catalytic Asymmetric Synthesis of Aromatic Spiroketals by SpinPhox/Iridium(I)-Catalyzed Hydrogenation and Spiroketalization of α,α′-Bis(2-hydroxyarylidene) Ketones. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201106488] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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19
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Pati A, Mohapatra S, Behera RK. Synthesis of spiroheterocycles derived from benzo[f]chromanone. J Heterocycl Chem 2011. [DOI: 10.1002/jhet.636] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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20
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Wu KL, Mercado EV, Pettus TRR. A Convergent Total Synthesis of (±)-γ-Rubromycin. J Am Chem Soc 2011; 133:6114-7. [DOI: 10.1021/ja1115524] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kun-Liang Wu
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106-9510, United States
| | - Eduardo V. Mercado
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106-9510, United States
| | - Thomas R. R. Pettus
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106-9510, United States
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21
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Boyer A, Isono N, Lackner S, Lautens M. Domino rhodium(I)-catalysed reactions for the efficient synthesis of substituted benzofurans and indoles. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.05.106] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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22
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Rathwell D, Yang SH, Tsang K, Brimble M. An Efficient Formal Synthesis of the Human Telomerase Inhibitor (±)-γ-Rubromycin. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200903316] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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23
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Rathwell D, Yang SH, Tsang K, Brimble M. An Efficient Formal Synthesis of the Human Telomerase Inhibitor (±)-γ-Rubromycin. Angew Chem Int Ed Engl 2009; 48:7996-8000. [DOI: 10.1002/anie.200903316] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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24
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25
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Unexpected transformation of quinones to spirolactones and to naturally occurring naphthalenic compounds. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.01.058] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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26
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Choi KW, Brimble MA. Synthesis of spiroacetal-nucleosides as privileged natural product-like scaffolds. Org Biomol Chem 2009; 7:1424-36. [DOI: 10.1039/b818314g] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Giese MW, Moser WH. Stereoselective synthesis of the rocaglamide skeleton via a silyl vinylketene formation/[4 + 1] annulation sequence. Org Lett 2008; 10:4215-8. [PMID: 18754622 DOI: 10.1021/ol801435j] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The tricyclic core of the cyclopentabenzofurans has been prepared in an efficient and stereoselective manner utilizing an intramolecular silyl vinylketene formation/[4 + 1] annulation sequence. This novel approach affords the ABC ring system where the adjacent phenyl and aryl substituents of the C ring have the required cis relationship.
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Affiliation(s)
- Matthew W Giese
- Department of Chemistry and Chemical Biology, Indiana University-Purdue University, Indianapolis, Indiana 46202, USA
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28
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Main CA, Rahman SS, Hartley RC. Synthesis of spiroacetals using functionalised titanium carbenoids. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2008.05.094] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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29
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Zhou G, Zhu J, Xie Z, Li Y. An Efficient Synthesis of Highly Functionalized [5,6] Aromatic Spiroketals by Hetero-Diels−Alder Reaction. Org Lett 2008; 10:721-4. [PMID: 18266379 DOI: 10.1021/ol7029068] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Guanglian Zhou
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P.R. China
| | - Jianrong Zhu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P.R. China
| | - Zhixiang Xie
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P.R. China
| | - Ying Li
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P.R. China
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30
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Choi KW, Brimble MA. Synthesis of spiroacetal-triazoles as privileged natural product-like scaffolds using “click chemistry”. Org Biomol Chem 2008; 6:3518-26. [DOI: 10.1039/b808454h] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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31
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Wu KL, Wilkinson S, Reich NO, Pettus TRR. Facile synthesis of naphthoquinone spiroketals by diastereoselective oxidative [3 + 2] cycloaddition. Org Lett 2007; 9:5537-40. [PMID: 18044909 PMCID: PMC2430727 DOI: 10.1021/ol702450d] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A highly selective oxidative [3 + 2] cycloaddition of chiral enol ethers and hydroxynaphthoquinone is described. This convergent strategy is amenable to an enantioselective synthesis of beta-rubromycin and related naphthoquinone spiroketals. Several compounds were found to inhibit DNA-polymerase and telomerase in a manner resembling alpha-rubromycin and beta-rubromycin.
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Affiliation(s)
- Kun-Liang Wu
- Department of Chemistry and Biochemistry, University of California at Santa Barbara, Santa Barbara, California 93106-9510, USA
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