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Lood K, Tikk T, Krüger M, Schmidt B. Methylene Capping Facilitates Cross-Metathesis Reactions of Enals: A Short Synthesis of 7-Methoxywutaifuranal from the Xylochemical Isoeugenol. J Org Chem 2022; 87:3079-3088. [PMID: 35037461 DOI: 10.1021/acs.joc.1c02851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Four combinations of type-I olefins isoeugenol and 4-hydroxy-3-methoxystyrene with type-II olefins acrolein and crotonaldehyde were investigated in cross-metathesis (CM) reactions. While both type-I olefins are suitable CM partners for this transformation, we observed synthetically useful conversions only with type-II olefin crotonaldehyde. For economic reasons, isoeugenol, a cheap xylochemical available from renewable lignocellulose or from clove oil, is the preferred type-I CM partner. Nearly quantitative conversions to coniferyl aldehyde by the CM reaction of isoeugenol and crotonaldehyde can be obtained at ambient temperature without a solvent or at high substrate concentrations of 2 mol·L-1 with the second-generation Hoveyda-Grubbs catalyst. Under these conditions, the ratio of reactants can be reduced to 1:1.5 and catalyst loadings as low as 0.25 mol % are possible. The high reactivity of the isoeugenol/crotonaldehyde combination in olefin metathesis reactions was demonstrated by a short synthesis of the natural product 7-methoxywutaifuranal, which was obtained from isoeugenol in a 44% yield over five steps. We suggest that the superior performance of crotonaldehyde in the CM reactions investigated can be rationalized by "methylene capping", i.e., the steric stabilization of the propagating Ru-alkylidene species.
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Affiliation(s)
- Kajsa Lood
- Institut fuer Chemie, Universitaet Potsdam, Karl-Liebknecht-Straße 24-25, D-14476 Potsdam-Golm, Germany
| | - Triin Tikk
- Institut fuer Chemie, Universitaet Potsdam, Karl-Liebknecht-Straße 24-25, D-14476 Potsdam-Golm, Germany
| | - Mandy Krüger
- Institut fuer Chemie, Universitaet Potsdam, Karl-Liebknecht-Straße 24-25, D-14476 Potsdam-Golm, Germany
| | - Bernd Schmidt
- Institut fuer Chemie, Universitaet Potsdam, Karl-Liebknecht-Straße 24-25, D-14476 Potsdam-Golm, Germany
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2
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Dahat Y, Saha P, Mathew JT, Chaudhary SK, Srivastava AK, Kumar D. Traditional uses, phytochemistry and pharmacological attributes of Pterocarpus santalinus and future directions: A review. JOURNAL OF ETHNOPHARMACOLOGY 2021; 276:114127. [PMID: 33915135 DOI: 10.1016/j.jep.2021.114127] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 03/19/2021] [Accepted: 04/10/2021] [Indexed: 06/12/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Pterocarpus santalinus, an ancient folk medicine, is endemic to the eastern ghats of south India, and the heartwood is prescribed since time immemorial for the mitigation of inflammatory disorders in traditional practice and ayurvedic system of medicines. AIM OF THE STUDY This review aims to provide collective pieces of information of the traditional uses, phytochemicals, and pharmacological facets of P. santalinus, with an intuition for promoting future research to explore its pharmaceutical potential as a therapeutic agent against modern maladies. MATERIAL AND METHODS Extensive literature search was performed to collate the data by using various electronic search engines. A network pharmacology-based approach is incorporated for validation of traditional claims orbiting around anti-inflammatory properties and directed its future exploration against obesity, ovarian inflammation, ovarian folliculogenesis, and inflammatory breast cancer. RESULTS In a nutshell, the present review encompasses the phytochemistry, pharmacology of this species intending to sensitize the scientific community for future research on this promising plant. Nearly 85 chemical constituents are reported from the plants wherein bark and leaves are enriched with the lupane and oleanane class of triterpene while sesquiterpenes and polyphenolic compounds are predominantly present in the heartwood of the plant. Although phytochemical investigations are being reported since the mid-twentieth century however there has been recent interest in the evaluation of biological activities such as anti-inflammatory, anti-oxidant, anti-cancer, anti-viral, etc. CONCLUSION: In conclusion, a systematic phytochemical analysis and pharmacological exploration in close collaboration for establishing the therapeutic potential of the chemical constituents present in P. santalinus is recommended to substantiate the traditional claims for bringing it into the mainstream pharmaceutical and commercial utilization.
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Affiliation(s)
- Yogita Dahat
- Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology (IICB), 4, Raja SC Mullick Road, Jadavpur, Kolkata, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India
| | - Priyanka Saha
- Cancer Biology & Inflammatory Disorder Division, CSIR-Indian Institute of Chemical Biology (IICB), 4, Raja SC Mullick Road, Jadavpur, Kolkata, India
| | - J T Mathew
- West Bengal Forest Department, Kolkata, India
| | - Sushil K Chaudhary
- Faculty of Pharmacy, DIT University, Mussoorie-Diversion Road, Makkawala, Dehradun, 248009, Uttarakhand, India; Institute of Bioresources & Sustainable Development, Takyelpat, Imphal, Manipur, India.
| | - Amit K Srivastava
- Cancer Biology & Inflammatory Disorder Division, CSIR-Indian Institute of Chemical Biology (IICB), 4, Raja SC Mullick Road, Jadavpur, Kolkata, India.
| | - Deepak Kumar
- Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology (IICB), 4, Raja SC Mullick Road, Jadavpur, Kolkata, India.
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3
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Sun J, Yang H, Tang W. Recent advances in total syntheses of complex dimeric natural products. Chem Soc Rev 2021; 50:2320-2336. [PMID: 33470268 DOI: 10.1039/d0cs00220h] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Dimeric natural products are a collection of molecules with diverse molecular architectures and significant bio-activities. In this tutorial review, total synthesis of complex dimeric natural products accomplished in recent years are summarized and various dimerization strategies are discussed. By highlighting the selected representative examples, this review aims to demonstrate the recent tactics of dimerization which is an important process integrated into the whole synthetic sequences of dimeric natural products, provide insights on structural and chemical properties of monomers and dimers of related natural products, and promote further technological advances in organic synthesis and biological studies of complex dimeric natural products.
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Affiliation(s)
- Jiawei Sun
- State Key Laboratory of Bio-Organic & Natural Products Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China.
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4
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Cervi A, Vo Y, Chai CLL, Banwell MG, Lan P, Willis AC. Gold(I)-Catalyzed Intramolecular Hydroarylation of Phenol-Derived Propiolates and Certain Related Ethers as a Route to Selectively Functionalized Coumarins and 2 H-Chromenes. J Org Chem 2021; 86:178-198. [PMID: 33253562 DOI: 10.1021/acs.joc.0c02011] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Methods are reported for the efficient assembly of a series of phenol-derived propiolates, including the parent system 56, and their Au(I)-catalyzed cyclization (intramolecular hydroarylation) to give the corresponding coumarins (e.g., 1). Simple syntheses of natural products such as ayapin (144) and scoparone (145) have been realized by such means, and the first of these subject to single-crystal X-ray analysis. A related process is described for the conversion of propargyl ethers such as 156 into the isomeric 2H-chromene precocene I (159), a naturally occurring inhibitor of juvenile hormone biosynthesis.
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Affiliation(s)
- Aymeric Cervi
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia.,Institute of Chemical and Engineering Sciences, 8 Biomedical Grove, #07-01 Neuros, 138665, Singapore
| | - Yen Vo
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Christina L L Chai
- Institute of Chemical and Engineering Sciences, 8 Biomedical Grove, #07-01 Neuros, 138665, Singapore.,Department of Pharmacy, National University of Singapore, 18 Science Drive 4, 117543, Singapore
| | - Martin G Banwell
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia.,Institute for Advanced and Applied Chemical Synthesis, Jinan University, Guangzhou, Guangdong 510632, China
| | - Ping Lan
- Institute for Advanced and Applied Chemical Synthesis, Jinan University, Guangzhou, Guangdong 510632, China
| | - Anthony C Willis
- Research School of Chemistry, Institute of Advanced Studies, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
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5
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Bilel H, Hamdi N, Fischmeister C, Bruneau C. Transformations of bio‐sourced 4‐hydroxyphenylpropanoids based on olefin metathesis. ChemCatChem 2020. [DOI: 10.1002/cctc.202000959] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Hallouma Bilel
- Chemistry Department College of Science Jouf University P.O. Box 2014 Sakaka Saudi Arabia
- Research Laboratory of Environmental Sciences and Technologies (LR16ES09) Higher Institute of Environmental Sciences and Technology University of Carthage Hammam-Lif Tunisia
| | - Naceur Hamdi
- Research Laboratory of Environmental Sciences and Technologies (LR16ES09) Higher Institute of Environmental Sciences and Technology University of Carthage Hammam-Lif Tunisia
- Colleges of Science and Arts at Al Rass Qassim University Qassim Saudi Arabia
| | - Cédric Fischmeister
- Univ Rennes CNRS, ISCR (Institut des Sciences Chimiques de Rennes) – UMR6226 35000 Rennes France
| | - Christian Bruneau
- Univ Rennes CNRS, ISCR (Institut des Sciences Chimiques de Rennes) – UMR6226 35000 Rennes France
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6
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Kwak SH, Stephenson TN, Lee HE, Ge Y, Lee H, Min SM, Kim JH, Kwon DY, Lee YM, Hong J. Evaluation of Manassantin A Tetrahydrofuran Core Region Analogues and Cooperative Therapeutic Effects with EGFR Inhibition. J Med Chem 2020; 63:6821-6833. [DOI: 10.1021/acs.jmedchem.0c00151] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Seung-Hwa Kwak
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Tesia N. Stephenson
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Hye-Eun Lee
- College of Pharmacy, BK21 Plus KNU Multi-Omics Creative Drug Research Team, Research Institute of Pharmaceutical Sciences, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 41566, Republic of Korea
| | - Yun Ge
- College of Pharmacy, BK21 Plus KNU Multi-Omics Creative Drug Research Team, Research Institute of Pharmaceutical Sciences, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 41566, Republic of Korea
| | - Hyunji Lee
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Sophia M. Min
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Jea Hyun Kim
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Do-Yeon Kwon
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - You Mie Lee
- College of Pharmacy, BK21 Plus KNU Multi-Omics Creative Drug Research Team, Research Institute of Pharmaceutical Sciences, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 41566, Republic of Korea
| | - Jiyong Hong
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
- Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, North Carolina 27710, United States
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7
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Fu W, Yu A, Jiang H, Zuo M, Wu H, Yang Z, An Q, Sun Z, Chu W. A visible-light-induced cascade reaction of etherification/C-C cyclization: efficient synthesis of dibenzo[b,d]oxepin-7(6H)-ones. Org Biomol Chem 2019; 17:3324-3327. [PMID: 30874283 DOI: 10.1039/c9ob00247b] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A visible-light-induced palladium-catalyzed cascade reaction was developed by etherification/C-C coupling cyclization of α-bromoacetophenones with phenols. A series of dibenzo[b,d]oxepin-7(6H)-one derivatives were efficiently synthesized by using this method in good yields. Furthermore, this method was applied to the synthesis of protosappanin A. The protocol has advantages such as simple reaction conditions, wide range of substrates and high reaction efficiency.
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Affiliation(s)
- Wanyong Fu
- School of Chemistry and Materials Science, Heilongjiang University, Harbin, Heilongjiang 150080, PR China
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8
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Recent applications of magnesium- and Zinc-TMP amides in the synthesis of bioactive targets. Tetrahedron 2019. [DOI: 10.1016/j.tet.2018.12.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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9
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Gao K, Zhang YG, Wang Z, Ding H. Recent development on the [5+2] cycloadditions and their application in natural product synthesis. Chem Commun (Camb) 2019; 55:1859-1878. [DOI: 10.1039/c8cc09077g] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The recent developments on the [5+2] cycloadditions and their application in the synthesis of complex natural products are discussed.
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Affiliation(s)
- Kai Gao
- Institute of Medicinal Natural Products
- School of Advanced Study
- Taizhou University
- Taizhou 318000
- P. R. China
| | - Yong-Gang Zhang
- Institute of Medicinal Natural Products
- School of Advanced Study
- Taizhou University
- Taizhou 318000
- P. R. China
| | - Zhiming Wang
- Institute of Medicinal Natural Products
- School of Advanced Study
- Taizhou University
- Taizhou 318000
- P. R. China
| | - Hanfeng Ding
- Institute of Medicinal Natural Products
- School of Advanced Study
- Taizhou University
- Taizhou 318000
- P. R. China
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10
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Alhaffar MT, Akhtar MN, Ali SA. Utilization of catecholic functionality in natural safrole and eugenol to synthesize mussel-inspired polymers. RSC Adv 2019; 9:21265-21277. [PMID: 35521353 PMCID: PMC9066001 DOI: 10.1039/c9ra04719k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2019] [Accepted: 07/01/2019] [Indexed: 01/07/2023] Open
Abstract
Naturally occurring safrole I upon epoxidation gave safrole oxide II, which underwent ring opening polymerization using a Lewis acid initiator/catalyst comprising of triphenylmethylphosphonium bromide/triisobutylaluminum to afford new polyether III in excellent yields. Epoxy monomer II and allyl glycidyl ether IV in various proportions have been randomly copolymerized to obtain copolymer V. A mechanism has been proposed for the polymerization reaction involving chain transfer to the monomers. A strategy has been developed for the deprotection of the methylene acetal of V using Pb(OAc)4 whereby one of the methylene protons is replaced with a labile OAc group to give VI. The pendant allyl groups in VI have been elaborated via a thiol–ene reaction using cysteamine hydrochloride and thioglycolic acid to obtain cationic VII and anionic VIII polymers, both containing a mussel-inspired Dopa-based catechol moiety. During aqueous work up, the protecting group containing OAc was deprotected under mild conditions. Cationic VII and anionic VIII were also obtained via an alternate route using epoxide IX derived from 3,4-bis[tert-butyldimethylsilyloxy]allylbenzene. Monomer IX was homo- as well as copolymerized with IV using Lewis acid initiator/catalyst system to obtain homopolymer X and copolymer X1. Copolymer XI was then elaborated using a thiol–ene reaction followed by F− catalysed silyl deprotection to obtain mussel inspired polymers VII and VIII, which by virtue of having charges of opposite algebraic signs were used to form their coacervate. Naturally occurring safrole I upon epoxidation gave safrole oxide II, which underwent polymerization using a Lewis acid initiator/catalyst of triphenylmethylphosphonium bromide/triisobutylaluminum to afford new polyether III in excellent yields.![]()
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Affiliation(s)
- Mouheddin T. Alhaffar
- Chemistry Department
- King Fahd University of Petroleum & Minerals
- Dhahran 31261
- Saudi Arabia
| | - Mohammad N. Akhtar
- Center for Refining and Petrochemicals
- RI, King Fahd University of Petroleum & Minerals
- Dhahran 31261
- Saudi Arabia
| | - Shaikh A. Ali
- Chemistry Department
- King Fahd University of Petroleum & Minerals
- Dhahran 31261
- Saudi Arabia
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11
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12
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Liu X, Hu YJ, Fan JH, Zhao J, Li S, Li CC. Recent synthetic studies towards natural products via [5 + 2] cycloaddition reactions. Org Chem Front 2018. [DOI: 10.1039/c7qo01123g] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
In this review, we provide a summary of recent progress regarding synthetic studies towards natural products via [5 + 2] cycloaddition reactions.
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Affiliation(s)
- Xin Liu
- Institute of Chinese Medical Sciences
- University of Macau
- Macao
- China
- Department of Chemistry
| | - Ya-Jian Hu
- Institute of Chinese Medical Sciences
- University of Macau
- Macao
- China
- Department of Chemistry
| | - Jian-Hong Fan
- Institute of Chinese Medical Sciences
- University of Macau
- Macao
- China
- Department of Chemistry
| | - Jing Zhao
- Institute of Chinese Medical Sciences
- University of Macau
- Macao
- China
| | - Shaoping Li
- Institute of Chinese Medical Sciences
- University of Macau
- Macao
- China
| | - Chuang-Chuang Li
- Department of Chemistry
- Southern University of Science and Technology
- Shenzhen 518055
- China
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13
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Jung JW, Kim JK, Jun JG. Syntheses and Anti-inflammatory Activity of Natural 1,3-Diarylpropenes. Chem Pharm Bull (Tokyo) 2016; 64:632-7. [PMID: 27025559 DOI: 10.1248/cpb.c16-00089] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
First syntheses of five natural 1,3-diarylpropenes (cinnamylphenols) 2-4, 7, and 8 along with synthesis of two other natural 1,3-diarylpropenes 1 and 5 and E-isomer of mucronulastyrene (6) were achieved by Friedel-Crafts alkylation as a key step. Subsequently, their anti-inflammatory effects were also investigated in lipopolysaccharide (LPS)-induced RAW264.7 macrophages. The compounds exhibited significant inhibition of inflammatory mediated nitric oxide (NO) production with no cytotoxicity except compound 8 (dalberatin B) at 10 µM concentration and IC50 values were found in the range from 4.05 to 16.76 µM.
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Affiliation(s)
- Jong-Woon Jung
- Department of Chemistry and Institute of Natural Medicine, Hallym University
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14
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15
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Liu J, Zhou X, Wang C, Fu W, Chu W, Sun Z. Total synthesis of protosappanin A and its derivatives via palladium catalyzed ortho C–H activation/C–C cyclization under microwave irradiation. Chem Commun (Camb) 2016; 52:5152-5. [DOI: 10.1039/c6cc01149g] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Protosappanin A, a complex natural product with high bioactivity, and 25 of its derivatives were synthesized through an intramolecular ortho C–H activation/C–C cyclization, ring-enlargement and deprotection reaction. C–H activation as the key step was investigated and optimized.
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Affiliation(s)
- Jiaqi Liu
- Key Laboratory of Chemical Engineering Process & Technology for High-efficiency Conversion
- College of Chemistry and Materials Science
- Heilongjiang University
- Harbin
- P. R. China
| | - Xuan Zhou
- Key Laboratory of Chemical Engineering Process & Technology for High-efficiency Conversion
- College of Chemistry and Materials Science
- Heilongjiang University
- Harbin
- P. R. China
| | - Chenglong Wang
- Key Laboratory of Chemical Engineering Process & Technology for High-efficiency Conversion
- College of Chemistry and Materials Science
- Heilongjiang University
- Harbin
- P. R. China
| | - Wanyong Fu
- Key Laboratory of Chemical Engineering Process & Technology for High-efficiency Conversion
- College of Chemistry and Materials Science
- Heilongjiang University
- Harbin
- P. R. China
| | - Wenyi Chu
- Key Laboratory of Chemical Engineering Process & Technology for High-efficiency Conversion
- College of Chemistry and Materials Science
- Heilongjiang University
- Harbin
- P. R. China
| | - Zhizhong Sun
- Key Laboratory of Chemical Engineering Process & Technology for High-efficiency Conversion
- College of Chemistry and Materials Science
- Heilongjiang University
- Harbin
- P. R. China
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16
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Abstract
A concise and expeditious approach to the total synthesis of broussonone A, a p-quinol natural compound, has been developed. The key features of the synthesis include the Grubbs II catalyst mediated cross metathesis of two aromatic subunits, and a chemoselective oxidative dearomatizationin the presence of two phenol moieties. Especially, optimization associated with the CM reaction of ortho-alkoxystyrenes was also studied, which are known to be ineffective for Ru-catalyzed metathesis reactions under conventional reaction conditions because ortho-alkoxy group could coordinate to the ruthenium center, resulting in the potential complication of catalyst inhibition.
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17
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Strych S, Journot G, Pemberton RP, Wang SC, Tantillo DJ, Trauner D. Biomimetische Totalsynthese von Santalin Y. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201411350] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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Strych S, Journot G, Pemberton RP, Wang SC, Tantillo DJ, Trauner D. Biomimetic Total Synthesis of Santalin Y. Angew Chem Int Ed Engl 2015; 54:5079-83. [DOI: 10.1002/anie.201411350] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2014] [Revised: 03/06/2015] [Indexed: 11/11/2022]
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19
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The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2013. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2014.09.021] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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20
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Photochemical formation of intricarene. Nat Commun 2014; 5:5597. [PMID: 25470600 DOI: 10.1038/ncomms6597] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Accepted: 10/17/2014] [Indexed: 11/09/2022] Open
Abstract
Sunlight is the ultimate driver of biosynthesis but photochemical steps late in biosynthetic pathways are very rare. They appear to play a role in the formation of certain furanocembranoids isolated from Caribbean corals. One of these compounds, intricarene, has been suspected to arise from an intramolecular 1,3-dipolar cycloaddition involving an oxidopyrylium. Here we show, by a combination of experiments and theory, that the oxidopyrylium forms under photochemical conditions and that its cycloaddition occurs via a triplet state. The formation of a complex by-product can be rationalized by another photochemical step that involves a conical intersection. Our work raises the question whether intricarene is biosynthesized in the natural habitat of the corals or is an artefact formed during workup. It also demonstrates that the determination of exact irradiation spectra, in combination with quantum chemical calculations, enables the rationalization of complex reaction pathways that involve multiple excited states.
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