1
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Li SS, Zhao LL, Pan M, Feng N, Li BQ, Zhang XZ, Peng JB, Ma AJ. Total Synthesis of (+)-Peniciketal B. Org Lett 2023; 25:8501-8505. [PMID: 37975639 DOI: 10.1021/acs.orglett.3c03472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2023]
Abstract
An efficient synthesis of (+)-peniciketal B has been accomplished in 15 steps from the commercially available materials atraric acid, acryloyl chloride, and (+)-homoallylic alcohol. A convergent synthetic approach that is quite concise for constructing either "hemisphere" of (+)-peniciketal B with a common intermediate is employed that relies on a cascade intermolecular FeCl3-mediated "inner sphere" Michael-type reaction/double cyclization of an α,β-unsaturated ketone and substituted phenol to build the benzo-fused 2,8-dioxabicyclo[3.3.1]nonane with excellent diastereoselectivity. The generality of the transformation was also demonstrated by the broad scope of substrates that would be potential candidates for natural product synthesis and medicinal chemistry. Benzannulated [6,6]spiroketal was installed by a late-stage acid-catalyzed spiroketalization.
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Affiliation(s)
- Shan-Shan Li
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, China
| | - Li-Li Zhao
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, China
| | - Min Pan
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, China
| | - Na Feng
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, China
| | - Bao-Qiong Li
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, China
| | - Xiang-Zhi Zhang
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, China
| | - Jin-Bao Peng
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, China
| | - Ai-Jun Ma
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong 529020, China
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2
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Wang AF, Tian JM, Zhao XJ, Li ZH, Zhang Y, Lu K, Wang H, Zhang SY, Tu YQ, Ding TM, Xie YY. Asymmetric Intramolecular Hydroalkylation of Internal Olefin with Cycloalkanone to Directly Access Polycyclic Systems. Angew Chem Int Ed Engl 2023; 62:e202308858. [PMID: 37462217 DOI: 10.1002/anie.202308858] [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: 06/24/2023] [Accepted: 07/17/2023] [Indexed: 08/04/2023]
Abstract
An asymmetric intramolecular hydroalkylation of unactivated internal olefins with tethered cyclic ketones was realized by the cooperative catalysis of a newly designed chiral amine (SPD-NH2 ) and PdII complex, providing straightforward access to either bridged or fused bicyclic systems containing three stereogenic centers with excellent enantioselectivity (up to 99 % ee) and diastereoselectivity (up to >20 : 1 dr). Notably, the bicyclic products could be conveniently transformed into a diverse range of key structures frequently found in bioactive terpenes, such as Δ6 -protoilludene, cracroson D, and vulgarisins. The steric hindrance between the Ar group of the SPD-NH2 catalyst and the branched chain of the substrate, hydrogen-bonding interactions between the N-H of the enamine motif and the C=O of the directing group MQ, and the counterion of the PdII complex were identified as key factors for excellent stereoinduction in this dual catalytic process by density functional theory calculations.
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Affiliation(s)
- Ai-Fang Wang
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
| | - Jin-Miao Tian
- College of Pharmaceutical Sciences & Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou, 310014, P. R. China
| | - Xiao-Jing Zhao
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
| | - Zi-Hao Li
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
| | - Ye Zhang
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
| | - Ka Lu
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Hong Wang
- College of Pharmaceutical Sciences & Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou, 310014, P. R. China
| | - Shu-Yu Zhang
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
| | - Yong-Qiang Tu
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Tong-Mei Ding
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
| | - Yu-Yang Xie
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China
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3
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Cooreman K, De Spiegeleer B, Van Poucke C, Vanavermaete D, Delbare D, Wynendaele E, De Witte B. Emerging pharmaceutical therapies of Ascidian-derived natural products and derivatives. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2023; 102:104254. [PMID: 37648122 DOI: 10.1016/j.etap.2023.104254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2023] [Revised: 08/22/2023] [Accepted: 08/23/2023] [Indexed: 09/01/2023]
Abstract
In a growing multidrug-resistant environment, the identification of potential new drug candidates with an acceptable safety profile is a substantial crux in pharmaceutical discovery. This review discusses several aspects and properties of approved marine natural products derived from ascidian sources (phylum Chordata, subphylum Tunicata) and/or their deduced analogues including their biosynthetic origin, (bio)chemical preclinical assessments and known efficacy-safety profiles, clinical status in trials, but also translational developments, opportunities and final conclusions. The review also describes the preclinical assessments of a large number of other ascidian compounds that have not been involved in clinical trials yet. Finally, the emerging research on the connectivity of the ascidian hosts and their independent or obligate symbiotic guests is discussed. The review covers the latest information on the topic of ascidian-derived marine natural products over the last two decades including 2022, with the majority of publications published in the last decade.
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Affiliation(s)
- Kris Cooreman
- Aquatic Environment and Quality, Animal Sciences Unit, Flanders Research Institute for Agriculture, Fisheries and Food, Jacobsenstraat 1, BE-8400 Ostend, Belgium
| | - Bart De Spiegeleer
- Faculty of Pharmaceutical Sciences, Drug Quality and Registration Group, Ghent University, Ottergemsesteenweg 460, BE-9000 Ghent, Belgium
| | - Christof Van Poucke
- Technology and Food Science Unit, Flanders Research Institute for Agriculture, Fisheries and Food, Brusselsesteenweg 370, BE-9090 Melle, Belgium
| | - David Vanavermaete
- Aquatic Environment and Quality, Animal Sciences Unit, Flanders Research Institute for Agriculture, Fisheries and Food, Jacobsenstraat 1, BE-8400 Ostend, Belgium
| | - Daan Delbare
- Aquatic Environment and Quality, Animal Sciences Unit, Flanders Research Institute for Agriculture, Fisheries and Food, Jacobsenstraat 1, BE-8400 Ostend, Belgium
| | - Evelien Wynendaele
- Faculty of Pharmaceutical Sciences, Drug Quality and Registration Group, Ghent University, Ottergemsesteenweg 460, BE-9000 Ghent, Belgium
| | - Bavo De Witte
- Aquatic Environment and Quality, Animal Sciences Unit, Flanders Research Institute for Agriculture, Fisheries and Food, Jacobsenstraat 1, BE-8400 Ostend, Belgium.
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4
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Ye X, Wu X, Guo SR, Huang D, Sun X. Recent advances of sodium sulfinates in radical reactions. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153368] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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5
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Goodine T, Oelgemöller M. Corymbia citriodora
: A Valuable Resource from Australian Flora for the Production of Fragrances, Repellents, and Bioactive Compounds. CHEMBIOENG REVIEWS 2020. [DOI: 10.1002/cben.202000013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Tyler Goodine
- James Cook University College of Science and Engineering 1 James Cook Drive 4811 Townsville Queensland Australia
| | - Michael Oelgemöller
- James Cook University College of Science and Engineering 1 James Cook Drive 4811 Townsville Queensland Australia
- Ghent University Department of Organic and Macromolecular Chemistry Krijgslaan 281 S4 9000 Gent Belgium
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6
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Lu Z, Buchwald SL. Enantioselective Preparation of Arenes with β‐Stereogenic Centers: Confronting the 1,1‐Disubstituted Olefin Problem Using CuH/Pd Cooperative Catalysis. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202004414] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Zhaohong Lu
- Department of Chemistry Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139 USA
| | - Stephen L. Buchwald
- Department of Chemistry Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge MA 02139 USA
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7
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Lu Z, Buchwald SL. Enantioselective Preparation of Arenes with β-Stereogenic Centers: Confronting the 1,1-Disubstituted Olefin Problem Using CuH/Pd Cooperative Catalysis. Angew Chem Int Ed Engl 2020; 59:16128-16132. [PMID: 32438497 DOI: 10.1002/anie.202004414] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 05/11/2020] [Indexed: 12/15/2022]
Abstract
Arenes with β-stereogenic centers are important substructures in pharmaceuticals and natural products. We have developed an asymmetric anti-Markovnikov hydroarylation of 1,1-disubstituted olefins by dual palladium and copper hydride catalysis as a convenient and general approach to access these substructures. This efficient one-step process addresses several limitations of the traditional stepwise approaches. The use of cesium benzoate as a base and a common phosphine ligand for both the Cu- and Pd-catalyzed processes were important discoveries that allow these challenging olefin substrates to be efficiently transformed. A variety of aryl bromide coupling partners, including numerous heterocycles, were coupled with 1,1-disubstituted alkenes to generate arenes with β-stereogenic centers.
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Affiliation(s)
- Zhaohong Lu
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Stephen L Buchwald
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
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8
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Yong‐Qiang Tu. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/anie.201813549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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9
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Yong‐Qiang Tu. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201813549] [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]
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10
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Muralikrishna K, Chaithanya Kumar G, Satyanarayana V, Sudheer Kumar R, Yadav JS. Formal synthesis of Pellasoren – A. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.09.035] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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11
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Kumar GC, Satyanarayana V, Muralikrishna K, Yadav JS. Studies towards the Synthesis of Portentol. ChemistrySelect 2018. [DOI: 10.1002/slct.201801798] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Vavilapalli Satyanarayana
- Center for Semiochemicals; CSIR-Indian Institute of Chemical Technology, Hyderabad, Telangana; 500076
| | - Katta Muralikrishna
- Center for Semiochemicals; CSIR-Indian Institute of Chemical Technology, Hyderabad, Telangana; 500076
| | - Jhillu Singh Yadav
- Center for Semiochemicals; CSIR-Indian Institute of Chemical Technology, Hyderabad, Telangana; 500076
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12
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Sudina PR, Motati DR, Seema A. Stereocontrolled Total Synthesis of Nonenolide. JOURNAL OF NATURAL PRODUCTS 2018; 81:1399-1404. [PMID: 29889525 DOI: 10.1021/acs.jnatprod.8b00001] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Nonenolide (1) was first isolated from the entomopathogenic fungus Cordyceps militaries BCC2816 and exhibited good antimalarial activity against Plasmodium falciparum K1. Structurally, it features a decanolide with a trans-double bond attached to two chiral hydroxy groups, making the total synthesis of the exclusive isomer of 1 more difficult. Herein, we report the successful synthesis of 1 by employing a MacMillan α-hydroxylation to generate three chiral centers in both the key fragments, starting from 1,6-hexanediol and 1,4-butanediol, followed by Steglich esterification of compounds 2 and 3. The exclusive E-isomer was obtained via a ring-closing metathesis of the mono-PMB-protected diene 19. Deprotection provided the required natural product 1.
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Affiliation(s)
- Purushotham Reddy Sudina
- Division of Natural Product Chemistry , CSIR-Indian Institute of Chemical Technology , Hyderabad - 500007 , India
| | - Damoder Reddy Motati
- Division of Natural Product Chemistry , CSIR-Indian Institute of Chemical Technology , Hyderabad - 500007 , India
| | - Aravind Seema
- Department of Chemistry , Osmania University , Hyderabad - 500007 , India
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13
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Satyanarayana V, Kumar AS, Muralikrishna K, Kumar GC, Kumar R S, Kumar CS, Yadav JS. Studies towards the Synthesis of Lepranthin. ChemistrySelect 2018. [DOI: 10.1002/slct.201702982] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
| | - Alleni Suman Kumar
- Center for Semiochemicals; CSIR- Indian Institute of Chemical Technology; Hyderabad− 500007 India
| | - Katta Muralikrishna
- Center for Semiochemicals; CSIR- Indian Institute of Chemical Technology; Hyderabad− 500007 India
| | | | - Sudheer Kumar R
- Center for Semiochemicals; CSIR- Indian Institute of Chemical Technology; Hyderabad− 500007 India
| | | | - Jhillu S. Yadav
- Center for Semiochemicals; CSIR- Indian Institute of Chemical Technology; Hyderabad− 500007 India
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14
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Zhang FM, Zhang SY, Tu YQ. Recent progress in the isolation, bioactivity, biosynthesis, and total synthesis of natural spiroketals. Nat Prod Rep 2018; 35:75-104. [DOI: 10.1039/c7np00043j] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The isolation, bioactivity, biosynthesis, and total synthesis of natural spiroketals from 2011 to July 2017 have been summarized in this review.
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Affiliation(s)
- Fu-Min Zhang
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - Shu-Yu Zhang
- School of Chemistry and Chemical Engineering
- Shanghai Jiao Tong University
- Shanghai 200240
- P. R. China
| | - Yong-Qiang Tu
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
- School of Chemistry and Chemical Engineering
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15
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Li QM, Luo JG, Zhang YM, Li ZR, Wang XB, Yang MH, Luo J, Sun HB, Chen YJ, Kong LY. Involucratustones A-C: Unprecedented Sesquiterpene Dimers Containing Multiple Contiguous Quaternary Carbons from Stahlianthus involucratus. Chemistry 2015; 21:13206-9. [PMID: 26228004 DOI: 10.1002/chem.201502631] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2015] [Indexed: 01/04/2023]
Abstract
Involucratustones A-C (1-3), three cadinane dimers containing multiple contiguous quaternary carbons, were isolated from the rhizomes of Stahlianthus involucratus. Their structures were determined by a combination of NMR spectroscopy, chemical conversion, and X-ray diffraction analysis. Compounds 1 and 2 are rearranged homodimers of cadinane sesquiterpene fused with a unique fully substituted 1-oxaspiro[4.4]nonane core observed for the first time in natural products, and 3 is a novel 3',4'-seco-cadinane-dimer. Compounds 1 and 2 exhibited potent cytotoxic activities, and 3 showed notable anti-inflammatory effect.
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Affiliation(s)
- Qiang-Ming Li
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009 (P. R. China)
| | - Jian-Guang Luo
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009 (P. R. China)
| | - Yang-Mei Zhang
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009 (P. R. China)
| | - Zhong-Rui Li
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009 (P. R. China)
| | - Xiao-Bing Wang
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009 (P. R. China)
| | - Ming-Hua Yang
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009 (P. R. China)
| | - Jun Luo
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009 (P. R. China)
| | - Hong-Bin Sun
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009 (P. R. China)
| | - Yi-Jun Chen
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009 (P. R. China)
| | - Ling-Yi Kong
- State Key Laboratory of Natural Medicines, Department of Natural Medicinal Chemistry, China Pharmaceutical University, 24 Tong Jia Xiang, Nanjing 210009 (P. R. China).
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16
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17
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18
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Maluenda I, Navarro O. Recent developments in the Suzuki-Miyaura reaction: 2010-2014. Molecules 2015; 20:7528-57. [PMID: 25919276 PMCID: PMC6272665 DOI: 10.3390/molecules20057528] [Citation(s) in RCA: 249] [Impact Index Per Article: 27.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Revised: 04/10/2015] [Accepted: 04/13/2015] [Indexed: 12/21/2022] Open
Abstract
The Suzuki-Miyaura reaction (SMR), involving the coupling of an organoboron reagent and an organic halide or pseudo-halide in the presence of a palladium or nickel catalyst and a base, has arguably become one of most utilized tools for the construction of a C-C bond. This review intends to be general account of all types of catalytic systems, new coupling partners and applications, including the literature between September 2010 and December 2014.
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Affiliation(s)
- Irene Maluenda
- Department of Chemistry, University of Sussex, Brighton BN1 9QJ, UK
| | - Oscar Navarro
- Department of Chemistry, University of Sussex, Brighton BN1 9QJ, UK.
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19
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Zhang FM, Tu YQ. Towards the real didemnaketal A: total syntheses of two C-21 stereoisomers of the proposed didemnaketal A. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.05.065] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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20
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Duan Z, Han J, Qian P, Zhang Z, Wang Y, Pan Y. A convenient enantioselective decarboxylative aldol reaction to access chiral α-hydroxy esters using β-keto acids. Beilstein J Org Chem 2014; 10:969-74. [PMID: 24991246 PMCID: PMC4077541 DOI: 10.3762/bjoc.10.95] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Accepted: 04/10/2014] [Indexed: 12/15/2022] Open
Abstract
We show a convenient decarboxylative aldol process using a scandium catalyst and a PYBOX ligand to generate a series of highly functionalized chiral α-hydroxy esters. The protocol tolerates a broad range of β-keto acids with inactivated aromatic and aliphatic α-keto esters. The possible mechanism is rationalized.
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Affiliation(s)
- Zhiqiang Duan
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China
| | - Jianlin Han
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China ; Institute for Chemistry & Biomedical Sciences, Nanjing University, Nanjing, 210093, China
| | - Ping Qian
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China
| | - Zirui Zhang
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China
| | - Yi Wang
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China ; State of Key Laboratory of Coordination, Nanjing University, Nanjing, 210093, China
| | - Yi Pan
- School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China ; State of Key Laboratory of Coordination, Nanjing University, Nanjing, 210093, China
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21
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Abstract
This review covers the literature published in 2012 for marine natural products, with 1035 citations (673 for the period January to December 2012) referring to compounds isolated from marine microorganisms and phytoplankton, green, brown and red algae, sponges, cnidarians, bryozoans, molluscs, tunicates, echinoderms, mangroves and other intertidal plants and microorganisms. The emphasis is on new compounds (1241 for 2012), together with the relevant biological activities, source organisms and country of origin. Biosynthetic studies, first syntheses, and syntheses that lead to the revision of structures or stereochemistries, have been included.
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Affiliation(s)
- John W Blunt
- Department of Chemistry, University of Canterbury, Christchurch, New Zealand.
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22
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Fuwa H, Muto T, Sekine K, Sasaki M. Total synthesis and structure revision of didemnaketal B. Chemistry 2014; 20:1848-60. [PMID: 24431266 DOI: 10.1002/chem.201303713] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2013] [Indexed: 11/07/2022]
Abstract
Didemnaketal B, a structurally complex spiroacetal that exhibits potent HIV-1 protease inhibitory activity, was originally discovered by Faulkner and his colleagues from the ascidian Didemnum sp. collected at Palau. Its absolute configuration was proposed on the basis of degradation/derivatization experiments of the authentic sample. However, our total synthesis of the proposed structure of didemnaketal B questioned the stereochemical assignment made by Faulkner et al. Here we describe in detail our first total synthesis of the proposed structure 2 of didemnaketal B, which features 1) a convergent synthesis of the C7-C21 spiroacetal domain by means of a strategy exploiting Suzuki-Miyaura coupling, 2) an Evans syn-aldol reaction and a vinylogous Mukaiyama aldol reaction for the assembly of the C1-C7 acyclic domain, and 3) a Nozaki-Hiyama-Kishi reaction for the construction of the C21-C28 side chain domain. The NMR spectroscopic discrepancies observed between synthetic 2 and the authentic sample as well as careful inspection of the Faulkner's stereochemical assignment led us to postulate that the absolute configuration of the C10-C20 domain of 2 has been erroneously assigned. Accordingly, the total synthesis of the revised structure 65 was achieved to show that the NMR spectroscopic properties of synthetic 65 were in good agreement with those of the authentic sample. Furthermore, application of the phenylglycine methyl ester (PGME) method to the C7-C21 spiroacetal domain enabled us to establish the absolute configuration of didemnaketal B.
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Affiliation(s)
- Haruhiko Fuwa
- Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577 (Japan), Fax: (+81) 22-217-6214.
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23
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Lu H, Zhang FM, Pan JL, Chen T, Li YF. NH4HF2 as a Selective TBS-Removal Reagent for the Synthesis of Highly Functionalized Spiroketal via Tandem Deprotection/Spiroketalization Procedure. J Org Chem 2013; 79:546-58. [DOI: 10.1021/jo402167q] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hui Lu
- State Key
Laboratory of Applied
Organic Chemistry and Department of Chemistry Lanzhou University, Lanzhou 730000, P. R. China
| | - Fu-Min Zhang
- State Key
Laboratory of Applied
Organic Chemistry and Department of Chemistry Lanzhou University, Lanzhou 730000, P. R. China
| | - Jin-Long Pan
- State Key
Laboratory of Applied
Organic Chemistry and Department of Chemistry Lanzhou University, Lanzhou 730000, P. R. China
| | - Tao Chen
- State Key
Laboratory of Applied
Organic Chemistry and Department of Chemistry Lanzhou University, Lanzhou 730000, P. R. China
| | - Yi-Fan Li
- State Key
Laboratory of Applied
Organic Chemistry and Department of Chemistry Lanzhou University, Lanzhou 730000, P. R. China
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Peng L, Zhang FM, Yang BM, Zhang XB, Liu WX, Zhang SY, Tu YQ. Toward the natural didemnaketal A: total synthesis of the isomer of didemnaketal A. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.09.078] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Fuwa H, Sekine K, Sasaki M. Total Synthesis of the Proposed Structure of Didemnaketal B. Org Lett 2013; 15:3970-3. [DOI: 10.1021/ol4017518] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Haruhiko Fuwa
- Gradutate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Kumiko Sekine
- Gradutate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Makoto Sasaki
- Gradutate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
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