1
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Li MR, Zheng MY, Wang DC, Guo HM. Pd-catalyzed 5- exo-dig cyclization/etherification cascade of N-propargyl arylamines for the synthesis of polysubstituted furans. Chem Commun (Camb) 2024. [PMID: 38967357 DOI: 10.1039/d4cc02255f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/06/2024]
Abstract
A method for the synthesis of furans bearing indoline skeletons was developed via an intramolecular palladium-catalyzed 5-exo-dig cyclization/etherification cascade of N-propargyl arylamines containing a 1,3-dicarbonyl side chain. This method realized the first capture of vinyl carbopalladiums by ketones as O-nucleophiles and showed a wide range of substrate tolerability affording trisubstituted furans in various yields. The enantioselective version for this domino process and diverse derivatizations of the reaction products were also studied.
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Affiliation(s)
- Meng-Ru Li
- State Key Laboratory of Antiviral Drugs, Pingyuan Laboratory, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China.
| | - Meng-Yao Zheng
- State Key Laboratory of Antiviral Drugs, Pingyuan Laboratory, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China.
| | - Dong-Chao Wang
- State Key Laboratory of Antiviral Drugs, Pingyuan Laboratory, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China.
| | - Hai-Ming Guo
- State Key Laboratory of Antiviral Drugs, Pingyuan Laboratory, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, China.
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2
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Zhang Z, Chen L, Wang Y, Dai W, Li P, Yang Z, Li X, Zheng H. Furan Synthesis via a Tandem 1,2-Acyloxy Migration/[3 + 2] Cycloaddition/Aromatization of Enol Ether-Tethered Propargylic Esters. J Org Chem 2023. [PMID: 37192482 DOI: 10.1021/acs.joc.3c00216] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
An effective method for the synthesis of furans is developed via a tandem 1,2-acyloxy migration/intramolecular [3 + 2] cycloaddition/aromatization of enol ether-tethered propargylic esters. The reaction exhibits excellent functional group tolerance, broad substrate scope, and excellent chemoselectivity. The isolation of dihydrofuran intermediates in some cases gives more insight into the [3 + 2] cycloisomerization process.
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Affiliation(s)
- Zhiqiang Zhang
- Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, College of Chemistry & Chemical Engineering, Shaoxing University, Shaoxing 312000, China
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest Agriculture & Forestry University, 3 Taicheng Road, Yangling 712100, China
| | - Luxin Chen
- Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, College of Chemistry & Chemical Engineering, Shaoxing University, Shaoxing 312000, China
| | - Ying Wang
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest Agriculture & Forestry University, 3 Taicheng Road, Yangling 712100, China
| | - Weikai Dai
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest Agriculture & Forestry University, 3 Taicheng Road, Yangling 712100, China
| | - Pengfei Li
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest Agriculture & Forestry University, 3 Taicheng Road, Yangling 712100, China
| | - Zhen Yang
- Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, College of Chemistry & Chemical Engineering, Shaoxing University, Shaoxing 312000, China
- Research Center of Advanced Catalytic Materials & Functional Molecular Synthesis, College of Chemistry & Chemical Engineering, Shaoxing University, Shaoxing 312000, China
| | - Xiuhuan Li
- State Key Laboratory of Crop Stress Biology for Arid Areas, Northwest Agriculture & Forestry University, 3 Taicheng Road, Yangling 712100, China
| | - Huaiji Zheng
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest Agriculture & Forestry University, 3 Taicheng Road, Yangling 712100, China
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3
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Gribble GW. Naturally Occurring Organohalogen Compounds-A Comprehensive Review. PROGRESS IN THE CHEMISTRY OF ORGANIC NATURAL PRODUCTS 2023; 121:1-546. [PMID: 37488466 DOI: 10.1007/978-3-031-26629-4_1] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/26/2023]
Abstract
The present volume is the third in a trilogy that documents naturally occurring organohalogen compounds, bringing the total number-from fewer than 25 in 1968-to approximately 8000 compounds to date. Nearly all of these natural products contain chlorine or bromine, with a few containing iodine and, fewer still, fluorine. Produced by ubiquitous marine (algae, sponges, corals, bryozoa, nudibranchs, fungi, bacteria) and terrestrial organisms (plants, fungi, bacteria, insects, higher animals) and universal abiotic processes (volcanos, forest fires, geothermal events), organohalogens pervade the global ecosystem. Newly identified extraterrestrial sources are also documented. In addition to chemical structures, biological activity, biohalogenation, biodegradation, natural function, and future outlook are presented.
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Affiliation(s)
- Gordon W Gribble
- Department of Chemistry, Dartmouth College, Hanover, NH, 03755, USA.
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4
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Rodríguez II, Rodríguez AD, Barnes CL. Isolation, Structural Analysis and Biological Activity Assays of Biselisabethoxanes A and B: Two Dissymmetric Bis-Diterpenes from the Southwestern Caribbean Sea Gorgonian Coral Pseudopterogorgia elisabethae. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27227879. [PMID: 36431975 PMCID: PMC9694721 DOI: 10.3390/molecules27227879] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 11/07/2022] [Accepted: 11/11/2022] [Indexed: 11/17/2022]
Abstract
Two novel dissymmetric diterpenoids, biselisabethoxanes A and B (1 and 2), were isolated from the hexane extracts of the gorgonian coral Pseudopterogorgia elisabethae. Biselisabethoxane A (1) represents the first example of a marine-derived C40 dimer made of two distinct diterpene fragments, whereas biselisabethoxane B (2) is a fused heterodimer stemming from coupling of two amphilectane-based fragments. The structures of 1 and 2 were elucidated based on 1D and 2D NMR spectral data analysis. The molecular structure of 1 was subsequently confirmed by X-ray crystallographic analysis. When evaluated for their inhibitory effects in a series of well-established biological activity assays the isolated compounds were shown to moderately inhibit the growth of Mycobacterium tuberculosis.
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Affiliation(s)
- Ileana I. Rodríguez
- Department of Chemistry, University of Puerto Rico–Río Piedras Campus, P.O. Box 23346, UPR Station, San Juan, PR 00931, USA
| | - Abimael D. Rodríguez
- Department of Chemistry, University of Puerto Rico–Río Piedras Campus, P.O. Box 23346, UPR Station, San Juan, PR 00931, USA
- Molecular Sciences Research Center, University of Puerto Rico–Río Piedras Campus, 1390 Ponce de León Avenue, San Juan, PR 00926, USA
- Correspondence:
| | - Charles L. Barnes
- Department of Chemistry, University of Missouri-Columbia, Columbia, MO 65211, USA
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5
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In Vivo Evaluation of the Acute Systemic Toxicity of (1S,2E,4R,6R,7E,11E)-Cembratriene-4,6-diol (4R) in Sprague Dawley Rats. NUTRACEUTICALS 2022; 2:60-70. [PMID: 35855209 PMCID: PMC9291268 DOI: 10.3390/nutraceuticals2020005] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The tobacco cembranoid (1S,2E,4R,6R,7E,11E)-2,7,11-cembratriene-4,6-diol (4R) interacts with nicotinic acetylcholine receptors, which results in neuroprotection against organophosphate toxicity, brain ischemia, and Parkinson’s disease. The present study is a continuation of our previous research in which we applied a single dose of 4R 1 h before or 24 h after exposure to diisopropylfluorophosphate (DFP) (analog of the nerve agent sarin). The 4R dose robustly decreased neuroinflammation and neuronal death at both timepoints. Here, we investigated the toxicity of a single dose of 4R in male and female Sprague Dawley (SD) rats after a subcutaneous (s.c.) injection of 6, 24, or 98 mg/kg. Body weight was not affected by 4R during the 7-day observation period. No histopathologic changes in the organs were attributed to 4R. Minor hematological and blood composition variations were detected on Day 3 in the mid- and the high-dose males, but these were resolved by Day 8. At the area of the s.c. injection site, alopecia and dry skin were detected in both the 4R-treated males and females and in the female controls.
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6
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Ishii D, Hirashima S, Akutsu H, Nakashima K, Matsushima Y, Sakai T, Miura T. Asymmetric Direct Vinylogous Conjugate Addition of Substituted Furanone Derivatives to (
E
)‐ and (
Z)
‐Benzoyl Acrylonitriles Using Organocatalysts. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Daiki Ishii
- School of Pharmacy Tokyo University of Pharmacy and Life Sciences 1432-1 Horinouchi Hachioji Tokyo 192-0392 Japan
| | - Shin‐ichi Hirashima
- School of Pharmacy Tokyo University of Pharmacy and Life Sciences 1432-1 Horinouchi Hachioji Tokyo 192-0392 Japan
| | - Hiroshi Akutsu
- School of Pharmacy Tokyo University of Pharmacy and Life Sciences 1432-1 Horinouchi Hachioji Tokyo 192-0392 Japan
| | - Kosuke Nakashima
- School of Pharmacy Tokyo University of Pharmacy and Life Sciences 1432-1 Horinouchi Hachioji Tokyo 192-0392 Japan
| | - Yasuyuki Matsushima
- School of Pharmacy Tokyo University of Pharmacy and Life Sciences 1432-1 Horinouchi Hachioji Tokyo 192-0392 Japan
| | - Takaaki Sakai
- School of Pharmacy Tokyo University of Pharmacy and Life Sciences 1432-1 Horinouchi Hachioji Tokyo 192-0392 Japan
| | - Tsuyoshi Miura
- School of Pharmacy Tokyo University of Pharmacy and Life Sciences 1432-1 Horinouchi Hachioji Tokyo 192-0392 Japan
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7
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coll toledano J. Pseudopterosins and Seco-Pseudopterosins: Compilation and Revision of Conflicting NMR Data, Names, Numbering Systems and Structural Elucidation. Nat Prod Commun 2022. [DOI: 10.1177/1934578x221079415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The present review is focussed on the structural elucidation of the bicyclic and tricyclic diterpenoid title compounds isolated from Pseudopterogorgia species, displaying a direct structural relationship with the biosynthetic precursor GGPP (regular isoprenoid skeletons). A compilation of 1H and 13C NMR spectroscopic data is presented grouped by similar spin systems. Apparent inconsistencies or potential missassignments are discussed, pointing out convenient revisions of data assignment to improve structure correlations. Some hemisynthetic intermediates in the structural elucidation process are included, as well as data of representative synthetic compounds.
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8
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Zhu B, Zhang T, Yu Y, Pan D, Mao H, Zhu G, Chang J. Sythesis of γ-hydroxy-γ-perfluoroalkyl butenolides and exocyclic double bond butanolides via regioselective allylic alkylations of MBH carbonates with 2-perfluoroalkyl-oxazol-5(2H)-ones. Org Chem Front 2022. [DOI: 10.1039/d2qo00321j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, two general one-pot two-step methods for the preparation of γ-hydroxyl-γ-perfluoromethyl butenolides and γ- hydroxyl-γ-perfluoromethyl exocyclic double bond butanolides from Morita−Baylis−Hillman (MBH) carbonates with 2-perfluoroalkyl-oxazol-5(2H)-ones have been reported for the...
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9
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Silyldienolates in Organocatalytic Enantioselective Vinylogous Mukaiyama-Type Reactions: A Review. Molecules 2021; 26:molecules26226902. [PMID: 34833996 PMCID: PMC8620713 DOI: 10.3390/molecules26226902] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 11/13/2021] [Accepted: 11/14/2021] [Indexed: 11/17/2022] Open
Abstract
Mukaiyama aldol, Mannich, and Michael reactions are arguably amongst the most important C-C bond formation processes and enable access to highly relevant building blocks of various natural products. Their vinylogous extensions display equally high potential in the formation of important key intermediates featuring even higher functionalization possibilities through an additional conjugated C-C double bond. Hence, it is much desired to develop highly selective vinylogous methods in order to enable unconventional, more efficient asymmetric syntheses of biologically active compounds. In this regard, silyl-dienolates were discovered to display high regioselectivities due to their tendency toward γ-additions. The control of the enantio- and diastereoinduction of these processes have been for a long time dominated by transition metal catalysis, but it received serious competition by the application of organocatalytic approaches since the beginning of this century. In this review, the organocatalytic applications of silyl-dienolates in asymmetric vinylogous C-C bond formations are summarized, focusing on their scope, characteristics, and limitations.
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10
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Yu C, Ji P, Zhang Y, Meng X, Wang W. Construction of Enantioenriched γ,γ-Disubstituted Butenolides Enabled by Chiral Amine and Lewis Acid Cascade Cocatalysis. Org Lett 2021; 23:7656-7660. [PMID: 34543030 DOI: 10.1021/acs.orglett.1c02916] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Herein we report a cascade cocatalysis strategy for the facile construction of chiral γ,γ-disubstituted butenolides. The synthetic manifold employs simple alkynoic acids instead of the preformed silyloxy furans or 5-substituted furan-2(3H)-ones. In situ formed 5-substituted furan-2(3H)-ones by AgNO3 or Ph3PAuCl/AgOTf catalyzed cyclization of alkynoic acids can smoothly engage in the subsequent chiral diphenylprolinol TMS-ether catalyzed Michael and Michael-aldol reactions. The cascade process serves as a general approach to chiral quaternary γ,γ-disubstituted butenolides.
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Affiliation(s)
- Chenguang Yu
- Departments of Pharmacology and Toxicology and Chemistry and Biochemistry and BIO5 Institute, University of Arizona, 1703 East Mabel Street, Tucson, Arizona 85721-0207, United States.,Calibr at Scripps Research, La Jolla, California 92037, United States
| | - Peng Ji
- Departments of Pharmacology and Toxicology and Chemistry and Biochemistry and BIO5 Institute, University of Arizona, 1703 East Mabel Street, Tucson, Arizona 85721-0207, United States
| | - Yueteng Zhang
- Departments of Pharmacology and Toxicology and Chemistry and Biochemistry and BIO5 Institute, University of Arizona, 1703 East Mabel Street, Tucson, Arizona 85721-0207, United States
| | - Xiang Meng
- Departments of Pharmacology and Toxicology and Chemistry and Biochemistry and BIO5 Institute, University of Arizona, 1703 East Mabel Street, Tucson, Arizona 85721-0207, United States
| | - Wei Wang
- Departments of Pharmacology and Toxicology and Chemistry and Biochemistry and BIO5 Institute, University of Arizona, 1703 East Mabel Street, Tucson, Arizona 85721-0207, United States
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11
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Quintanilla MG, Pérez I, de Francisco B, Martin A, Salardon N, de la Fuente JL, Batanero B. New insights into the phenacyl bromide electroreduction: Unambiguously characterized 5,5́-bis(3,5-diaryl-2(5H)-furanone). Anodic oxidation of 2,4-diphenylfuran. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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12
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Ishii D, Hirashima SI, Nakashima K, Akutsu H, Sakai T, Matsushima Y, Kawada M, Miura T. Asymmetric Direct Vinylogous Conjugate Addition of Substituted Furanone Derivatives to Benzoyl Acrylonitrile: Stereoselective Synthesis Toward Bicyclic γ-Lactams. Org Lett 2020; 23:480-485. [DOI: 10.1021/acs.orglett.0c04004] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Daiki Ishii
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Shin-ichi Hirashima
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Kosuke Nakashima
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Hiroshi Akutsu
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Takaaki Sakai
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Yasuyuki Matsushima
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Masahiro Kawada
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Tsuyoshi Miura
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
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13
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Huang Y, Liao J, Wang W, Liu H, Guo H. Synthesis of heterocyclic compounds through nucleophilic phosphine catalysis. Chem Commun (Camb) 2020; 56:15235-15281. [PMID: 33320123 DOI: 10.1039/d0cc05699e] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Nucleophilic phosphine catalysis is a practical and powerful tool for the synthesis of various heterocyclic compounds with the advantages of environmentally friendly, metal-free, and mild reaction conditions. The present report summarizes the construction of four to eight-membered heterocyclic compounds containing nitrogen, oxygen and sulphur atoms through phosphine-catalyzed intramolecular annulations and intermolecular [2+2], [3+2], [4+1], [3+1+1], [5+1], [4+2], [2+2+2], [3+3], [4+3] and [3+2+3] annulations of electron-deficient alkenes, allenes, alkynes and Morita-Baylis-Hillman carbonates.
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Affiliation(s)
- Yifan Huang
- Department of Chemistry and Innovation Center of Pesticide Research, China Agricultural University, Beijing 100193, China.
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14
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Da-Anoy JP, Cabaitan PC, Conaco C. Warm temperature alters the chemical cue preference of Acropora tenuis and Heliopora coerulea larvae. MARINE POLLUTION BULLETIN 2020; 161:111755. [PMID: 33120034 DOI: 10.1016/j.marpolbul.2020.111755] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Revised: 10/01/2020] [Accepted: 10/07/2020] [Indexed: 05/19/2023]
Abstract
Larvae released into the water column rely on chemical cues from the benthos for successful settlement. However, larval preference for substrates may be affected by rising seawater temperature brought about by global climate change. In this study, we examined the effect of elevated temperature on chemical cue preference by larvae of the scleractinian coral, Acropora tenuis, and the octocoral, Heliopora coerulea, collected from northwestern Philippines. At ambient temperature (28 °C), both H. coerulea and A. tenuis larvae showed preference for substrates containing either crustose coralline algae or crude ethanolic extracts from conspecific or congeneric corals. In contrast, at higher temperature (30 °C), greater preference was shown for substrates containing the crude extract from conspecific or congeneric corals. These results demonstrate that elevated temperature can change larval substrate preference, which will have downstream impacts on crucial biological processes, such as larval settlement and recruitment.
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Affiliation(s)
- Jeric P Da-Anoy
- Marine Science Institute, University of the Philippines, Diliman, Quezon City 1101, Philippines
| | - Patrick C Cabaitan
- Marine Science Institute, University of the Philippines, Diliman, Quezon City 1101, Philippines
| | - Cecilia Conaco
- Marine Science Institute, University of the Philippines, Diliman, Quezon City 1101, Philippines.
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15
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Lasker HR, Bramanti L, Tsounis G, Edmunds PJ. The rise of octocoral forests on Caribbean reefs. ADVANCES IN MARINE BIOLOGY 2020; 87:361-410. [PMID: 33293017 DOI: 10.1016/bs.amb.2020.08.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Coral reefs throughout the tropics have experienced large declines in the abundance of scleractinian corals over the last few decades, and some reefs are becoming functionally dominated by animal taxa other than scleractinians. This phenomenon is striking on many shallow reefs in the tropical western Atlantic, where arborescent octocorals now are numerically and functionally dominant. Octocorals are one of several taxa that have been overlooked for decades in analyses of coral reef community dynamics, and our understanding of why octocorals are favoured (whereas scleractinians are not) on some modern reefs, and how they will affect the function of future reef communities, is not commensurate with the task of scientifically responding to the coral reef crisis. We summarize the biological and ecological features predisposing octocorals for success under contemporary conditions, and focus on those features that could have generated resistance and resilience of octocoral populations to environmental change on modern reefs. There is a rich set of opportunities for rapid advancement in understanding the factors driving the success of octocorals on modern reefs, but we underscore three lines of inquiry: (1) the functional implications of strongly mixotrophic, polytrophic, and plastic nutrition, (2) the capacity to recruit at high densities and maintain rapid initial rates of vertical growth, and (3) the emergent properties associated with dense animal forests at high colony densities.
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Affiliation(s)
- Howard R Lasker
- Department of Environment and Sustainability and Department of Geology, University at Buffalo, Buffalo, NY, United States.
| | - Lorenzo Bramanti
- CNRS-Sorbonne Université, Laboratoire d'Ecogéochimie des Environnements Benthiques, LECOB, Observatoire Océanologique de Banyuls sur Mer, Banyuls sur Mer, France
| | - Georgios Tsounis
- Department of Biology, California State University, Northridge, CA, United States
| | - Peter J Edmunds
- Department of Biology, California State University, Northridge, CA, United States
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16
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Abstract
Gorgonian corals are considered as a rich source of secondary metabolites with
unique structural features and biological activities. A large number of novel metabolites
with potent pharmacological properties have been isolated from gorgonian corals. Some of
these compounds have exhibited to possess new mechanisms of action, which hold great
promises as potential lead compounds in future marine drug development. This review aims
to provide an overview of chemical constituents and biological activities of gorgonian corals
from 2015 to December, 2019. Some 145 metabolites, including 16 sesquiterpenoids, 62
diterpenoids, 62 steroids and 5 alkaloids were reported during this period and their pharmacological
activities were investigated. Moreover, the peculiar structure and potential medicinal
value of these new compounds are discussed in this review.
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Affiliation(s)
- Hui Lei
- School of Pharmacy, Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Peng Jiang
- School of Pharmacy, Southwest Medical University, Luzhou, Sichuan 646000, China
| | - Dan Zhang
- School of Pharmacy, Southwest Medical University, Luzhou, Sichuan 646000, China
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17
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Breunig M, Yuan P, Gaich T. An Unexpected Transannular [4+2] Cycloaddition during the Total Synthesis of (+)-Norcembrene 5. Angew Chem Int Ed Engl 2020; 59:5521-5525. [PMID: 31750980 PMCID: PMC7155007 DOI: 10.1002/anie.201912613] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 11/04/2019] [Indexed: 11/26/2022]
Abstract
We report a concise and versatile total synthesis of the diterpenoid (+)-norcembrene 5 from simple building blocks. Ring-closing metathesis and an auxiliary-directed 1,4-addition are the key steps of our synthetic route. During the synthesis, an unprecedented, highly oxidized pentacyclic structural motif was established from a furanocembranoid through transannular [4+2] cycloaddition.
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Affiliation(s)
- Michael Breunig
- Department of ChemistryUniversity of KonstanzUniversitätsstrasse 1078464KonstanzGermany
| | - Po Yuan
- Department of ChemistryUniversity of KonstanzUniversitätsstrasse 1078464KonstanzGermany
| | - Tanja Gaich
- Department of ChemistryUniversity of KonstanzUniversitätsstrasse 1078464KonstanzGermany
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18
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Breunig M, Yuan P, Gaich T. Eine unerwartete transanulare [4+2]‐Cycloaddition während der Gesamtsynthese von (+)‐Norcembren 5. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201912613] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Michael Breunig
- Fachbereich Chemie Universität Konstanz Universitätsstraße 10 78464 Konstanz Deutschland
| | - Po Yuan
- Fachbereich Chemie Universität Konstanz Universitätsstraße 10 78464 Konstanz Deutschland
| | - Tanja Gaich
- Fachbereich Chemie Universität Konstanz Universitätsstraße 10 78464 Konstanz Deutschland
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19
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Santacruz L, Hurtado DX, Doohan R, Thomas OP, Puyana M, Tello E. Metabolomic study of soft corals from the Colombian Caribbean: PSYCHE and 1H-NMR comparative analysis. Sci Rep 2020; 10:5417. [PMID: 32214197 PMCID: PMC7096504 DOI: 10.1038/s41598-020-62413-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Accepted: 02/24/2020] [Indexed: 12/12/2022] Open
Abstract
Marine organisms have evolved to survive against predators in complex marine ecosystems via the production of chemical compounds. Soft corals (Cnidaria, Anthozoa, Octocorallia) are an important source of chemically diverse metabolites with a broad spectrum of biological activities. Herein, we perform a comparative study between high-resolution proton nuclear magnetic resonance (1H-NMR) and pure shift yielded by chirp excitation (PSYCHE) experiments to analyze the metabolic profile of 24 soft corals from the Colombian Caribbean to correlate chemical fingerprints with their cytotoxic activity against three cancer cell lines (human cervical carcinoma (SiHa), human prostatic carcinoma (PC3) and human lung adenocarcinoma (A549)). All data obtained were explored using multivariate analysis using principal components analysis (PCA) and orthogonal partial least squares (OPLS) analysis. The results did not show a significant correlation between clusters using 1H-NMR data in the PCA and OPLS-DA models and therefore did not provide conclusive evidence; on the other hand, a metabolomic analysis of PSYCHE data obtained under the same parameters revealed that when a decoupled experiment is performed, it was possible to establish a statistically valid correlation between the chemical composition of soft corals and their cytotoxic activity against the PC3 cancer cell line, where the asperdiol and plexaurolone markers were putatively identified and related to the cytotoxic activity presented by extracts of Plexaurella sp. and Plexaura kukenthali, respectively. These results increase the speed, effectiveness and reliability of analyses for the study of this type of complex matrices.
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Affiliation(s)
- Liliana Santacruz
- Bioprospecting Research Group and Biosciences Doctoral Program, Faculty of Engineering, Campus Puente del Común, Universidad de la Sabana, 250001, Chía, Colombia
| | - Diana X Hurtado
- Bioprospecting Research Group and Biosciences Doctoral Program, Faculty of Engineering, Campus Puente del Común, Universidad de la Sabana, 250001, Chía, Colombia
| | - Roisin Doohan
- Marine Biodiscovery, School of Chemistry and Ryan Institute, National University of Ireland Galway (NUI Galway), University Road, H91 TK33, Galway, Ireland
| | - Olivier P Thomas
- Marine Biodiscovery, School of Chemistry and Ryan Institute, National University of Ireland Galway (NUI Galway), University Road, H91 TK33, Galway, Ireland
| | - Mónica Puyana
- Departamento de Ciencias Biológicas y Ambientales, Universidad Jorge Tadeo Lozano, Carrera 4 # 22-61, 110311, Bogotá, Colombia
| | - Edisson Tello
- Bioprospecting Research Group and Biosciences Doctoral Program, Faculty of Engineering, Campus Puente del Común, Universidad de la Sabana, 250001, Chía, Colombia.
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20
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Mallik S, Bhajammanavar V, Baidya M. Catalyst-Controlled Regioselective Nitrosocarbonyl Aldol Reaction of Deconjugated Butenolides. Org Lett 2020; 22:1437-1441. [PMID: 31999129 DOI: 10.1021/acs.orglett.0c00039] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
An unprecedented regiodivergent nitrosocarbonyl aldol reaction of γ-substituted deconjugated butenolides is described. While Lewis base catalyst quinidine leveraged O-selective nitrosocarbonyl aldol reaction exclusively at the γ-position of deconjugated butenolides to produce γ-aminoxylation products, Lewis acid catalyst Cu(OTf)2 steered the competitive N-selective nitrosocarbonyl aldol reaction at the β-position, resulting in heterodifunctionalized butenolides. Both processes were amenable to a broad range of substrates and scalable, while the latter one represents a rare example of one-pot hetero-β,γ-difunctionalization of butenolide scaffolds.
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Affiliation(s)
- Sumitava Mallik
- Department of Chemistry , Indian Institute of Technology Madras , Chennai - 600 036 , India
| | - Vinod Bhajammanavar
- Department of Chemistry , Indian Institute of Technology Madras , Chennai - 600 036 , India
| | - Mahiuddin Baidya
- Department of Chemistry , Indian Institute of Technology Madras , Chennai - 600 036 , India
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21
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Gutiérrez M, Santamaría R, Gómez-Reyes JF, Guzmán HM, Ávila-Román J, Motilva V, Talero E. New Eunicellin-Type Diterpenes from the Panamanian Octocoral Briareum Asbestinum. Mar Drugs 2020; 18:E84. [PMID: 32012770 PMCID: PMC7074288 DOI: 10.3390/md18020084] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Revised: 01/22/2020] [Accepted: 01/24/2020] [Indexed: 12/20/2022] Open
Abstract
Gorgonian octocorals are considered a prolific source of secondary metabolites with a wide range of biological activities, including anti-inflammatory activity. In particular, the genus Briareum is known for producing a wealth of diterpenes with complex chemical structures. The chemical study of the methanolic extract of Briareum asbestinum collected in Bocas del Toro, on the Caribbean side of Panama, led to the isolation of three new eunicellin-type diterpenes: briarellin T (1), asbestinin 27 (2), asbestinin 28 (3) and the previously described asbestinin 17 (4). The structures of the new compounds were determined by extensive NMR analyses and HRMS. Anti-inflammatory activity assays showed a significant reduction of the pro-inflammatory cytokines TNF-α, IL-6, IL-1β and IL-8 as well as a downregulation of COX-2 expression in LPS-stimulated THP-1 macrophages. These findings support the potential use of these marine compounds as therapeutic agents in the treatment of inflammatory diseases.
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Affiliation(s)
- Marcelino Gutiérrez
- Centro de Biodiversidad y Descubrimiento de Drogas, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), Panamá, Apartado 0843-01103, Republic of Panama; (R.S.); (J.F.G.-R.)
| | - Ricardo Santamaría
- Centro de Biodiversidad y Descubrimiento de Drogas, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), Panamá, Apartado 0843-01103, Republic of Panama; (R.S.); (J.F.G.-R.)
| | - José Félix Gómez-Reyes
- Centro de Biodiversidad y Descubrimiento de Drogas, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), Panamá, Apartado 0843-01103, Republic of Panama; (R.S.); (J.F.G.-R.)
| | - Héctor M. Guzmán
- Smithsonian Tropical Research Institute, Balboa, Ancon, P. O. Box 0843-03092, Republic of Panama;
| | - Javier Ávila-Román
- Department of Biochemistry and Biotechnology, Faculty of Chemistry, Universitat Rovira i Virgili, 43007 Tarragona, Spain;
| | - Virginia Motilva
- Department of Pharmacology, Faculty of Pharmacy, University of Seville, 41012 Seville, Spain;
| | - Elena Talero
- Department of Pharmacology, Faculty of Pharmacy, University of Seville, 41012 Seville, Spain;
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22
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Molina SL, Forero AM, Ayala FI, Puyana M, Zea S, Castellanos L, Muñoz D, Arboleda G, Sandoval-Hernández AG, Ramos FA. Metabolic Profiling of the Soft Coral Erythropodium caribaeorum (Alcyonacea: Anthothelidae) from the Colombian Caribbean Reveals Different Chemotypes. Mar Drugs 2019; 18:E4. [PMID: 31861453 PMCID: PMC7024379 DOI: 10.3390/md18010004] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Revised: 10/11/2019] [Accepted: 10/12/2019] [Indexed: 12/23/2022] Open
Abstract
The Caribbean soft coral Erythropodium caribaeorum is a rich source of erythrolides-chlorinated briarane diterpenoids. These compounds have an ecological role as feeding deterrents, with a wide variation in their composition depending on the location where the sample is collected. In Colombia, this soft coral can be found at different locations in the Caribbean Sea including Santa Marta, Islas del Rosario, and Providencia-three environmentally different coral reef areas in the south and southwest Caribbean Sea. In order to evaluate differences in erythrolide composition, the metabolic profiles of samples from each of these locations were analyzed by HPLC-MS. Principal component analysis showed changes in the diterpene composition according to the sample origin. Diterpenes from samples collected at each location were isolated to describe the three chemotypes. The chemotype from Santa Marta was highly diverse, with the new erythrolides W and X together with eight known erythrolides. The sample from Islas del Rosario showed a low diversity chemotype constituted by high amounts of erythrolide A and B. The chemotype from Providencia showed low chemical diversity with only two main compounds-erythrolide V and R. Evaluation of cytotoxic activity against the human cancer cell lines PC-3, MCF7, and A549 showed erythrolides A and B as the more active compounds with IC50 values in the range from 2.45 to 30 μM.
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Affiliation(s)
- Sandra L. Molina
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia Sede Bogotá, Av Cra 30 45-03, 111112 Bogotá, Colombia; (S.L.M.); (A.M.F.); (F.I.A.); (L.C.); (D.M.); (A.G.S.-H.)
| | - Abel M. Forero
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia Sede Bogotá, Av Cra 30 45-03, 111112 Bogotá, Colombia; (S.L.M.); (A.M.F.); (F.I.A.); (L.C.); (D.M.); (A.G.S.-H.)
| | - Farja I. Ayala
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia Sede Bogotá, Av Cra 30 45-03, 111112 Bogotá, Colombia; (S.L.M.); (A.M.F.); (F.I.A.); (L.C.); (D.M.); (A.G.S.-H.)
| | - Mónica Puyana
- Departamento de Ciencias Biológicas y Ambientales, Facultad de Ciencias Naturales e Ingeniería, Universidad Jorge Tadeo Lozano Sede Bogotá, Cra 4 22-6,1, 110010 Bogotá, Colombia;
| | - Sven Zea
- Instituto de Estudios en Ciencias del Mar-CECIMAR, Universidad Nacional de Colombia Sede Caribe, 470006 Santa Marta, Colombia;
| | - Leonardo Castellanos
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia Sede Bogotá, Av Cra 30 45-03, 111112 Bogotá, Colombia; (S.L.M.); (A.M.F.); (F.I.A.); (L.C.); (D.M.); (A.G.S.-H.)
| | - Diego Muñoz
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia Sede Bogotá, Av Cra 30 45-03, 111112 Bogotá, Colombia; (S.L.M.); (A.M.F.); (F.I.A.); (L.C.); (D.M.); (A.G.S.-H.)
- Facultad de Ciencias, Universidad de Ciencias Aplicadas y Ambientales, 111166 Bogotá, Colombia
| | - Gonzalo Arboleda
- Instituto de Genética Humana, Universidad Nacional de Colombia Sede Bogotá, 111112 Bogotá, Colombia;
| | - Adrián G. Sandoval-Hernández
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia Sede Bogotá, Av Cra 30 45-03, 111112 Bogotá, Colombia; (S.L.M.); (A.M.F.); (F.I.A.); (L.C.); (D.M.); (A.G.S.-H.)
- Instituto de Genética Humana, Universidad Nacional de Colombia Sede Bogotá, 111112 Bogotá, Colombia;
| | - Freddy A. Ramos
- Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia Sede Bogotá, Av Cra 30 45-03, 111112 Bogotá, Colombia; (S.L.M.); (A.M.F.); (F.I.A.); (L.C.); (D.M.); (A.G.S.-H.)
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23
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Nagaraju S, Liu S, Liu J, Yang S, Liu R, Chen Z, Paplal B, Fang X. Regioselectivity-Switchable Catalytic Annulations of Alkynyl α-Diketones and α-Cyanoketones. Org Lett 2019; 21:10075-10080. [DOI: 10.1021/acs.orglett.9b04040] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sakkani Nagaraju
- Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
| | - Shuhua Liu
- Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
| | - Jinggong Liu
- Orthopedics Department, Guangdong Provincial Hospital of Traditional Chinese Medicine, Guangzhou 510120, China
| | - Shuang Yang
- State Key Laboratory of Structural Chemistry, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou 350100, China
| | - Rui Liu
- State Key Laboratory of Structural Chemistry, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou 350100, China
| | - Zhizhou Chen
- State Key Laboratory of Structural Chemistry, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou 350100, China
| | - Banoth Paplal
- Shandong Analysis and Test Center, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, China
| | - Xinqiang Fang
- State Key Laboratory of Structural Chemistry, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou 350100, China
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24
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Gupta V, Sahu D, Jain S, Vanka K, Singh RP. Diastereoselective multi-component tandem condensation: synthesis of 2-amino-4-(2-furanone)-4H-chromene-3-carbonitriles. Org Biomol Chem 2019; 17:8853-8857. [PMID: 31573594 DOI: 10.1039/c9ob01345h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A general strategy for a one-pot stereoselective synthesis of 2-amino-4-(2-furanone)-4H-chromene-3-carbonitriles by reaction of salicylaldehyde, malononitrile and butenolides via a tandem Knoevenagel/Pinner/vinylogous Michael condensation is presented. The β,γ-butenolides gave a syn-selective MCR adduct with a dr up to 11.5 : 1. The mechanistic insight into the MCR was obtained by DFT calculations.
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Affiliation(s)
- Vijay Gupta
- Indian Institute of Technology Delhi, Chemistry, New Delhi, Delhi, India.
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25
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Li M, Yang F, Yuan T, Li H, Li J, Chen ZS, Ji K. Syntheses of Z-Iodovinylfurans and 2-Acyl Furans via Controllable Cyclization of Ynenones. J Org Chem 2019; 84:12617-12625. [PMID: 31525974 DOI: 10.1021/acs.joc.9b01852] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A divergent synthesis of Z-iodovinylfurans and 2-acyl furans promoted by NIS via controllable cyclization of ynenones is reported. The reaction proceeded by sequential 5-exo-dig electrophilic cyclization to intermediate 2-(iodomethylene)-2H-furanium cation D, providing a range of synthetically valuable and useful trisubstituted furan derivatives 2 and 3 in moderate to excellent yields. This approach is metal-free, mild, and atom-economic, with good selectivity and high stereoselectivity.
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Affiliation(s)
- Mengxue Li
- College of Chemistry and Pharmacy, Shaanxi Key Laboratory of Natural Products & Chemical Biology , Northwest A&F University , 3 Taicheng Road , Yangling, Xianyang 712100 , Shaanxi , P. R. China
| | - Fang Yang
- College of Chemistry and Pharmacy, Shaanxi Key Laboratory of Natural Products & Chemical Biology , Northwest A&F University , 3 Taicheng Road , Yangling, Xianyang 712100 , Shaanxi , P. R. China
| | - Ting Yuan
- College of Chemistry and Pharmacy, Shaanxi Key Laboratory of Natural Products & Chemical Biology , Northwest A&F University , 3 Taicheng Road , Yangling, Xianyang 712100 , Shaanxi , P. R. China
| | - Haoyang Li
- College of Chemistry and Pharmacy, Shaanxi Key Laboratory of Natural Products & Chemical Biology , Northwest A&F University , 3 Taicheng Road , Yangling, Xianyang 712100 , Shaanxi , P. R. China
| | - Jian Li
- College of Chemistry and Pharmacy, Shaanxi Key Laboratory of Natural Products & Chemical Biology , Northwest A&F University , 3 Taicheng Road , Yangling, Xianyang 712100 , Shaanxi , P. R. China
| | - Zi-Sheng Chen
- College of Chemistry and Pharmacy, Shaanxi Key Laboratory of Natural Products & Chemical Biology , Northwest A&F University , 3 Taicheng Road , Yangling, Xianyang 712100 , Shaanxi , P. R. China
| | - Kegong Ji
- College of Chemistry and Pharmacy, Shaanxi Key Laboratory of Natural Products & Chemical Biology , Northwest A&F University , 3 Taicheng Road , Yangling, Xianyang 712100 , Shaanxi , P. R. China
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26
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Craig RA, Smith RC, Roizen JL, Jones AC, Virgil SC, Stoltz BM. Unified Enantioselective, Convergent Synthetic Approach toward the Furanobutenolide-Derived Polycyclic Norcembranoid Diterpenes: Synthesis of a Series of Ineleganoloids by Oxidation-State Manipulation of the Carbocyclic Core. J Org Chem 2019; 84:7722-7746. [PMID: 31066273 DOI: 10.1021/acs.joc.9b00635] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Late-stage synthetic efforts to advance the enatio- and diastereoselectively constructed [6,7,5,5]-fused tetracyclic scaffold toward the polycyclic norditerpenoid ineleganolide are disclosed. The described investigations focus on oxidation-state manipulation around the central cycloheptane ring. Computational evaluation of ground-state energies of dihydroineleganolide is used to rationalize empirical observations and provide insight for further synthetic development, enhancing the understanding of the conformational constraints of these compact polycyclic structures. Advanced synthetic manipulations generated a series of natural product-like compounds termed the ineleganoloids.
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Affiliation(s)
- Robert A Craig
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , United States
| | - Russell C Smith
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , United States
| | - Jennifer L Roizen
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , United States
| | - Amanda C Jones
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , United States
| | - Scott C Virgil
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , United States
| | - Brian M Stoltz
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , United States
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27
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Sakai T, Hirashima SI, Matsushima Y, Nakano T, Ishii D, Yamashita Y, Nakashima K, Koseki Y, Miura T. Synthesis of Chiral γ,γ-Disubstituted γ-Butenolides via Direct Vinylogous Aldol Reaction of Substituted Furanone Derivatives with Aldehydes. Org Lett 2019; 21:2606-2609. [DOI: 10.1021/acs.orglett.9b00574] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Takaaki Sakai
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Shin-ichi Hirashima
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Yasuyuki Matsushima
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Tatsuki Nakano
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Daiki Ishii
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Yoshifumi Yamashita
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Kosuke Nakashima
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Yuji Koseki
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
| | - Tsuyoshi Miura
- Tokyo University of Pharmacy and Life Sciences, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan
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28
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Lin W, Lin X, Cheng Y, Chang X, Zhou S, Li P, Li W. Organocatalytic enantioselective direct vinylogous Michael addition of γ-substituted deconjugate butenolides to azadienes. Org Chem Front 2019. [DOI: 10.1039/c9qo00597h] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The diastereoselective and enantioselective direct vinylogous Michael addition of γ-substituted β,γ-unsaturated γ-lactones to 2-arylidene-N-tosylbenzofuran-3(2H)-imines has been achieved with the aid of a quinine-derived squaramide.
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Affiliation(s)
- Wei Lin
- Department of Medicinal Chemistry
- School of Pharmacy
- Qingdao University
- Qingdao
- China
| | - Xiao Lin
- Department of Medicinal Chemistry
- School of Pharmacy
- Qingdao University
- Qingdao
- China
| | - Yuyu Cheng
- Department of Chemistry and Shenzhen Grubbs Institute
- Southern University of Science and Technology
- Shenzhen
- China
| | - Xiaoyong Chang
- Department of Chemistry and Shenzhen Grubbs Institute
- Southern University of Science and Technology
- Shenzhen
- China
| | - San Zhou
- Department of Medicinal Chemistry
- School of Pharmacy
- Qingdao University
- Qingdao
- China
| | - Pengfei Li
- Department of Chemistry and Shenzhen Grubbs Institute
- Southern University of Science and Technology
- Shenzhen
- China
| | - Wenjun Li
- Department of Medicinal Chemistry
- School of Pharmacy
- Qingdao University
- Qingdao
- China
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29
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Tenneti S, Biswas S, Cox GA, Mans DJ, Lim HJ, RajanBabu TV. Broadly Applicable Stereoselective Syntheses of Serrulatane, Amphilectane Diterpenes, and Their Diastereoisomeric Congeners Using Asymmetric Hydrovinylation for Absolute Stereochemical Control. J Am Chem Soc 2018; 140:9868-9881. [PMID: 30001133 PMCID: PMC6082684 DOI: 10.1021/jacs.8b03549] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
A stereogenic center, placed at an exocyclic location next to a chiral carbon in a ring to which it is attached, is a ubiquitous structural motif seen in many bioactive natural products, including di- and triterpenes and steroids. Installation of these centers has been a long-standing problem in organic chemistry. Few classes of compounds illustrate this problem better than serrulatanes and amphilectanes, which carry multiple methyl-bearing exocyclic chiral centers. Nickel-catalyzed asymmetric hydrovinylation (AHV) of vinylarenes and 1,3-dienes such as 1-vinylcycloalkenes provides an exceptionally facile way of introducing these chiral centers. This Article documents our efforts to demonstrate the generality of AHV to access not only the natural products but also their various diastereoisomeric derivatives. Key to success here is the availability of highly tunable phosphoramidite Ni(II) complexes useful for overcoming the inherent selectivity of the chiral intermediates. The yields for hydrovinylation (HV) reactions are excellent, and selectivities are in the range of 92-99% for the desired isomers. Discovery of novel, configurationally fluxional, yet sterically less demanding 2,2'-biphenol-derived phosphoramidite Ni complexes (fully characterized by X-ray) turned out to be critical for success in several HV reactions. We also report a less spectacular yet equally important role of solvents in a metal-ammonia reduction for the installation of a key benzylic chiral center. Starting with simple oxygenated styrene derivatives, we iteratively install the various exocyclic chiral centers present in typical serrulatane [e.g., a (+)- p-benzoquinone natural product, elisabethadione, nor-elisabethadione, helioporin D, a known advanced intermediate for the synthesis of colombiasin and elisapterosin] and amphilectane [e.g., A-F, G-J, and K,L pseudopterosins] derivatives. A concise table showing various synthetic approaches to these molecules is included in the Supporting Information. Our attempts to synthesize a hitherto elusive target, elisabethin A, led to a stereoselective, biomimetic route to pseudopterosin A-F aglycones.
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Affiliation(s)
| | | | | | | | | | - T. V. RajanBabu
- Department of Chemistry and Biochemistry, 100 West 18th Avenue, The Ohio State University, Columbus, Ohio 43210 United States
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30
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Craig RA, Smith RC, Roizen JL, Jones AC, Virgil SC, Stoltz BM. Development of a Unified Enantioselective, Convergent Synthetic Approach Toward the Furanobutenolide-Derived Polycyclic Norcembranoid Diterpenes: Asymmetric Formation of the Polycyclic Norditerpenoid Carbocyclic Core by Tandem Annulation Cascade. J Org Chem 2018; 83:3467-3485. [PMID: 29464957 PMCID: PMC5889334 DOI: 10.1021/acs.joc.7b02825] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
An enantioselective and diastereoselective approach toward the synthesis of the tetracyclic scaffold of the furanobutenolide-derived polycyclic norditerpenoids is described. Focusing on synthetic efforts toward ineleganolide, the synthetic approach utilizes a palladium-catalyzed enantioselective allylic alkylation for the construction of the requisite chiral tertiary ether. A diastereoselective cyclopropanation-Cope rearrangement cascade enabled the convergent assembly of the ineleganolide [6,7,5,5]-tetracyclic scaffold. Investigation of substrates for this critical tandem annulation process is discussed along with synthetic manipulations of the [6,7,5,5]-tetracyclic scaffold and the attempted interconversion of the [6,7,5,5]-tetracyclic scaffold of ineleganolide to the isomeric [7,6,5,5]-core of scabrolide A and its naturally occurring isomers. Computational evaluation of ground-state energies of late-stage synthetic intermediates was used to guide synthetic development and aid in the investigation of the conformational rigidity of these highly constrained and compact polycyclic structures.
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Affiliation(s)
- Robert A. Craig
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Russell C. Smith
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Jennifer L. Roizen
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Amanda C. Jones
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Scott C. Virgil
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Brian M. Stoltz
- Warren and Katherine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
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31
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Scesa P, Wangpaichitr M, Savaraj N, West L, Roche SP. A Kinetic Dearomatization Strategy for an Expedient Biomimetic Route to the Bielschowskysin Skeleton. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201711780] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Paul Scesa
- Department of Chemistry & Biochemistry; Florida Atlantic University; 777 Glades Road Boca Raton FL 33431 USA
| | - Medhi Wangpaichitr
- University of Miami School of Medicine; 1475 NW 12 Ave Miami FL 33136 USA
| | - Niramol Savaraj
- University of Miami School of Medicine; 1475 NW 12 Ave Miami FL 33136 USA
| | - Lyndon West
- Department of Chemistry & Biochemistry; Florida Atlantic University; 777 Glades Road Boca Raton FL 33431 USA
| | - Stéphane P. Roche
- Department of Chemistry & Biochemistry; Florida Atlantic University; 777 Glades Road Boca Raton FL 33431 USA
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32
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Scesa P, Wangpaichitr M, Savaraj N, West L, Roche SP. A Kinetic Dearomatization Strategy for an Expedient Biomimetic Route to the Bielschowskysin Skeleton. Angew Chem Int Ed Engl 2018; 57:1316-1321. [DOI: 10.1002/anie.201711780] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Indexed: 01/14/2023]
Affiliation(s)
- Paul Scesa
- Department of Chemistry & Biochemistry; Florida Atlantic University; 777 Glades Road Boca Raton FL 33431 USA
| | - Medhi Wangpaichitr
- University of Miami School of Medicine; 1475 NW 12 Ave Miami FL 33136 USA
| | - Niramol Savaraj
- University of Miami School of Medicine; 1475 NW 12 Ave Miami FL 33136 USA
| | - Lyndon West
- Department of Chemistry & Biochemistry; Florida Atlantic University; 777 Glades Road Boca Raton FL 33431 USA
| | - Stéphane P. Roche
- Department of Chemistry & Biochemistry; Florida Atlantic University; 777 Glades Road Boca Raton FL 33431 USA
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33
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Wang ZH, You Y, Chen YZ, Xu XY, Yuan WC. An asymmetric organocatalytic vinylogous Mannich reaction of 3-methyl-5-arylfuran-2(3H)-ones with N-(2-pyridinesulfonyl) imines: enantioselective synthesis of δ-amino γ,γ-disubstituted butenolides. Org Biomol Chem 2018; 16:1636-1640. [DOI: 10.1039/c7ob03117c] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of δ-amino γ,γ-disubstituted butenolides were obtained with satisfactory results via an asymmetric vinylogous Mannich reaction of 3-methyl-5-arylfuran-2(3H)-ones with N-(2-pyridinesulfonyl)imines.
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Affiliation(s)
- Zhen-Hua Wang
- Institute for Advanced Study
- Chengdu University
- Chengdu 610106
- China
| | - Yong You
- Institute for Advanced Study
- Chengdu University
- Chengdu 610106
- China
| | | | - Xiao-Ying Xu
- National Engineering Research Center of Chiral Drugs
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu 610041
- China
| | - Wei-Cheng Yuan
- National Engineering Research Center of Chiral Drugs
- Chengdu Institute of Organic Chemistry
- Chinese Academy of Sciences
- Chengdu 610041
- China
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34
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Tang Q, Lin L, Ji J, Hu H, Liu X, Feng X. Catalytic Asymmetric Direct Vinylogous Aldol Reaction of Isatins with β,γ-Unsaturated Butenolides. Chemistry 2017; 23:16447-16451. [DOI: 10.1002/chem.201704100] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 09/24/2017] [Indexed: 12/14/2022]
Affiliation(s)
- Qiong Tang
- Key Laboratory of Green Chemistry and Technology, Ministry of Education; College of Chemistry; Sichuan University; Chengdu 610064 P. R. China
| | - Lili Lin
- Key Laboratory of Green Chemistry and Technology, Ministry of Education; College of Chemistry; Sichuan University; Chengdu 610064 P. R. China
| | - Jie Ji
- Key Laboratory of Green Chemistry and Technology, Ministry of Education; College of Chemistry; Sichuan University; Chengdu 610064 P. R. China
| | - Haipeng Hu
- Key Laboratory of Green Chemistry and Technology, Ministry of Education; College of Chemistry; Sichuan University; Chengdu 610064 P. R. China
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry and Technology, Ministry of Education; College of Chemistry; Sichuan University; Chengdu 610064 P. R. China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry and Technology, Ministry of Education; College of Chemistry; Sichuan University; Chengdu 610064 P. R. China
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35
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Schütznerová E, Oliver AG, Slough GA, Krchňák V. Traceless Solid-Phase Synthesis of Fused Chiral Macrocycles via Conformational Constraint-Assisted Cyclic Iminium Formation. Chemistry 2017; 23:12876-12885. [DOI: 10.1002/chem.201702461] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Eva Schütznerová
- Institute of Molecular and Translation Medicine; Hněvotínská 5 Olomouc 779 00 Czech Republic
| | - Allen G. Oliver
- Department of Organic Chemistry and Biochemistry; University of Notre Dame; Notre Dame IN 46556 USA
| | - Greg A. Slough
- Chemistry Department; Kalamazoo College; 1200 Academy St. Kalamazoo MI 49006 USA
| | - Viktor Krchňák
- Department of Organic Chemistry; Palacký University; 17. listopadu 12 771 46 Olomouc Czech Republic
- Department of Organic Chemistry and Biochemistry; University of Notre Dame; Notre Dame IN 46556 USA
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36
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Craig RA, Stoltz BM. Polycyclic Furanobutenolide-Derived Cembranoid and Norcembranoid Natural Products: Biosynthetic Connections and Synthetic Efforts. Chem Rev 2017; 117:7878-7909. [PMID: 28520418 PMCID: PMC5497599 DOI: 10.1021/acs.chemrev.7b00083] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The polycyclic furanobutenolide-derived cembranoid and norcembranoid natural products are a family of congested, stereochemically complex, and extensively oxygenated polycyclic diterpenes and norditerpenes. Although the elegant architectures and biological activity profiles of these natural products have captured the attention of chemists since the isolation of the first members of the family in the 1990s, the de novo synthesis of only a single polycyclic furanobutenolide-derived cembranoid and norcembranoid has been accomplished. This article begins with a brief discussion of the proposed biosyntheses and biosynthetic connections among the polycyclic furanobutenolide-derived cembranoids and norcembranoids and then provides a comprehensive review of the synthetic efforts toward each member of the natural product family, including biomimetic, semisynthetic, and de novo synthetic strategies. This body of knowledge has been gathered to provide insight into the reactivity and constraints of these compact and highly oxygenated polycyclic structures, as well as to offer guidance for future synthetic endeavors.
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Affiliation(s)
- Robert A. Craig
- The Warren and Katharine Schlinger Laboratory of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA
| | - Brian M. Stoltz
- The Warren and Katharine Schlinger Laboratory of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, CA 91125, USA
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37
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McAulay K, Clark JS. Total Synthesis of 7-epi
-Pukalide and 7-Acetylsinumaximol B. Chemistry 2017; 23:9761-9765. [DOI: 10.1002/chem.201702591] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Kirsten McAulay
- WestCHEM; School of Chemistry, Joseph Black Building, University of Glasgow; University Avenue Glasgow G12 8QQ UK
| | - J. Stephen Clark
- WestCHEM; School of Chemistry, Joseph Black Building, University of Glasgow; University Avenue Glasgow G12 8QQ UK
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38
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Abstract
Herein, we report for the first time the design and linear synthesis of a truncated calyculone H (7) that lacks the telltale isopropyl/isopropylene groups, whereas the 12-membered macrocycle remains intact. Key steps for the framework of target molecule include allylic oxidation using SeO2, Sharpless asymmetric epoxidation, Barbier zinc allylation, and ring-closing metathesis (RCM) reactions. A second truncated "calyculone-like" analogue, 27, with a different oxidation pattern around the ring was also synthesized following a similar strategy. Screening for in vitro cytotoxicity against a panel of 60 human cancer cell lines revealed that 7 was as potent if not more so (for a few cell lines) than the natural product calyculone A (2).
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Affiliation(s)
- Penagaluri Balasubramanyam
- Department of Chemistry, University of Puerto Rico, P.O. Box 23346, U.P.R. Station, San Juan, Puerto Rico 00931-3346, United States
| | - Abimael D Rodríguez
- Department of Chemistry, University of Puerto Rico, P.O. Box 23346, U.P.R. Station, San Juan, Puerto Rico 00931-3346, United States
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39
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Wu B, Yu Z, Gao X, Lan Y, Zhou YG. Regioselective α-Addition of Deconjugated Butenolides: Enantioselective Synthesis of Dihydrocoumarins. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201700437] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Bo Wu
- State Key Laboratory of Catalysis; Dalian Institute of Chemical Physics; Chinese Academy of Sciences; Dalian 116023 P.R. China
| | - Zhaoyuan Yu
- School of Chemistry and Chemical Engineering; Chongqing University; Chongqing 400030 P.R. China
| | - Xiang Gao
- State Key Laboratory of Catalysis; Dalian Institute of Chemical Physics; Chinese Academy of Sciences; Dalian 116023 P.R. China
| | - Yu Lan
- School of Chemistry and Chemical Engineering; Chongqing University; Chongqing 400030 P.R. China
| | - Yong-Gui Zhou
- State Key Laboratory of Catalysis; Dalian Institute of Chemical Physics; Chinese Academy of Sciences; Dalian 116023 P.R. China
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40
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Wu B, Yu Z, Gao X, Lan Y, Zhou YG. Regioselective α-Addition of Deconjugated Butenolides: Enantioselective Synthesis of Dihydrocoumarins. Angew Chem Int Ed Engl 2017; 56:4006-4010. [PMID: 28247568 DOI: 10.1002/anie.201700437] [Citation(s) in RCA: 86] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2017] [Indexed: 11/08/2022]
Abstract
The enantioselective α-addition of deconjugated butenolides has rarely been exploited, in contrast to the well-studied γ-addition of deconjugated butenolides. In this study, an unprecedented asymmetric α-addition/transesterification of deconjugated butenolides with ortho-quinone methides generated in situ afforded a series of functionalized 3,4-dihydrocoumarins containing two contiguous stereogenic centers with excellent diastereo- and enantioselectivity. DFT calculations suggested that the rarely observed regioselectivity was due to the distortion energy that resulted from the interaction between the nucleophilic dienolate and the electrophilic ortho-quinone methide.
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Affiliation(s)
- Bo Wu
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P.R. China
| | - Zhaoyuan Yu
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400030, P.R. China
| | - Xiang Gao
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P.R. China
| | - Yu Lan
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400030, P.R. China
| | - Yong-Gui Zhou
- State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P.R. China
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41
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Naskar S, Das I. Elusive Thiyl Radical Migration in a Visible Light Induced Chemoselective Rearrangement of γ-Keto Acrylate Thioesters: Synthesis of Substituted Butenolides. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201601016] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Sandip Naskar
- Organic and Medicianl Chemistry Division; CSIR-Indian Institute of Chemical Biology; 4, Raja S. C. Mullick Road Jadavpur, Kolkata 700032 India, Fax: (+91)- 33-2473-5197
| | - Indrajit Das
- Organic and Medicianl Chemistry Division; CSIR-Indian Institute of Chemical Biology; 4, Raja S. C. Mullick Road Jadavpur, Kolkata 700032 India, Fax: (+91)- 33-2473-5197
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42
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Zhao C, Wang J, Jin DJ, Duan HQ, Xing GS, Tang SA. Two new eunicellin diterpenoids from the East China Sea gorgonian Muricella sp. JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH 2016; 18:848-853. [PMID: 27004724 DOI: 10.1080/10286020.2016.1164143] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2015] [Accepted: 03/07/2016] [Indexed: 06/05/2023]
Abstract
A phytochemical investigation on gorgonian Muricella sp. from East China Sea resulted in the isolation of eight eunicellin diterpenoids including two new ones, muricellins A-B (1, 2). Chemical structures of these compounds were elucidated by spectroscopic techniques (1D and 2D NMR and MS) and by comparison with data reported in the literature. Anti-rheumatoid arthritis activities of 1, 3, 4, and 6 have been evaluated.
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Affiliation(s)
- Chuan Zhao
- a Research Center of Basic Medical Sciences, Tianjin Key Laboratory on Technologies Enabling Development Clinical Therapeutics and Diagnostics (Theranostics) , School of Pharmacy, Tianjin Medical University , Tianjin 300070 , China
| | - Jia Wang
- a Research Center of Basic Medical Sciences, Tianjin Key Laboratory on Technologies Enabling Development Clinical Therapeutics and Diagnostics (Theranostics) , School of Pharmacy, Tianjin Medical University , Tianjin 300070 , China
| | - De-Jun Jin
- b School of Pharmaceutical Science , Hainan Medical University , Haikou 571190 , China
| | - Hong-Quan Duan
- a Research Center of Basic Medical Sciences, Tianjin Key Laboratory on Technologies Enabling Development Clinical Therapeutics and Diagnostics (Theranostics) , School of Pharmacy, Tianjin Medical University , Tianjin 300070 , China
| | - Guo-Sheng Xing
- c Orthopeadic Research Institute of Tianjin Hospital , Tianjin Hospital , Tianjin 300211 , China
| | - Sheng-An Tang
- a Research Center of Basic Medical Sciences, Tianjin Key Laboratory on Technologies Enabling Development Clinical Therapeutics and Diagnostics (Theranostics) , School of Pharmacy, Tianjin Medical University , Tianjin 300070 , China
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43
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Lei H. Diterpenoids of Gorgonian Corals: Chemistry and Bioactivity. Chem Biodivers 2016; 13:345-65. [DOI: 10.1002/cbdv.201500030] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Accepted: 04/27/2015] [Indexed: 12/17/2022]
Affiliation(s)
- Hui Lei
- Industrial Innovation Center for Nutrition and Health of Huzhou; Shanghai Institutes for Biological Sciences of Chinese Academy of Sciences; Huzhou 313000 P. R. China
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44
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Herstad G, Molesworth PP, Miller CM, Benneche T, Tius MA. Ring-closing metathesis in an enantioselective synthesis of the macrocyclic core of crassin acetate. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.02.050] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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45
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Christmann M, Hu J, Kitamura M, Stoltz B. Tetrahedron reports on organic chemistry. Tetrahedron 2015. [DOI: 10.1016/s0040-4020(15)00744-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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46
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Su YD, Su TR, Wen ZH, Hwang TL, Fang LS, Chen JJ, Wu YC, Sheu JH, Sung PJ. Briarenolides K and L, new anti-inflammatory briarane diterpenoids from an octocoral Briareum sp. (Briareidae). Mar Drugs 2015; 13:1037-50. [PMID: 25689566 PMCID: PMC4344617 DOI: 10.3390/md13021037] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Revised: 02/05/2015] [Accepted: 02/06/2015] [Indexed: 01/03/2023] Open
Abstract
Two new briarane-type diterpenoids, briarenolides K (1) and L (2), were isolated from an octocoral identified as Briareum sp. The structures of new briaranes 1 and 2 were elucidated by spectroscopic methods. In the in vitro anti-inflammatory effects test, briaranes 1 and 2 were found to significantly inhibit the accumulation of the pro-inflammatory iNOS protein of the lipopolysaccharide (LPS)-stimulated RAW264.7 macrophage cells.
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Affiliation(s)
- Yin-Di Su
- Department of Marine Biotechnology and Resources, Asia-Pacific Ocean Research Center, National Sun Yat-sen University, Kaohsiung 804, Taiwan.
- National Museum of Marine Biology and Aquarium, Pingtung 944, Taiwan.
| | - Tzu-Rong Su
- Department of Beauty Science, Meiho University, Pingtung 912, Taiwan.
- Antai Medical Care Cooperation Antai Tian-Sheng Memorial Hospital, Pingtung 928, Taiwan.
| | - Zhi-Hong Wen
- Department of Marine Biotechnology and Resources, Asia-Pacific Ocean Research Center, National Sun Yat-sen University, Kaohsiung 804, Taiwan.
| | - Tsong-Long Hwang
- Graduate Institute of Natural Products, Chang Gung University, Taoyuan 333, Taiwan.
| | - Lee-Shing Fang
- Department of Sport, Health and Leisure, Cheng Shiu University, Kaohsiung 833, Taiwan.
| | - Jih-Jung Chen
- Department of Pharmacy, Tajen University, Pingtung 907, Taiwan.
| | - Yang-Chang Wu
- School of Pharmacy, College of Pharmacy, China Medical University, Taichung 404, Taiwan.
- Chinese Medicine Research and Development Center, China Medical University Hospital, Taichung 404, Taiwan.
- Graduate Institute of Natural Products, Kaohsiung Medical University, Kaohsiung 807, Taiwan.
- Center for Molecular Medicine, China Medical University Hospital, Taichung 404, Taiwan.
| | - Jyh-Horng Sheu
- Department of Marine Biotechnology and Resources, Asia-Pacific Ocean Research Center, National Sun Yat-sen University, Kaohsiung 804, Taiwan.
| | - Ping-Jyun Sung
- Department of Marine Biotechnology and Resources, Asia-Pacific Ocean Research Center, National Sun Yat-sen University, Kaohsiung 804, Taiwan.
- National Museum of Marine Biology and Aquarium, Pingtung 944, Taiwan.
- Chinese Medicine Research and Development Center, China Medical University Hospital, Taichung 404, Taiwan.
- Graduate Institute of Natural Products, Kaohsiung Medical University, Kaohsiung 807, Taiwan.
- Graduate Institute of Marine Biology, National Dong Hwa University, Pingtung 944, Taiwan.
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47
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Zhao YM, Maimone TJ. Short, enantioselective total synthesis of chatancin. Angew Chem Int Ed Engl 2015; 54:1223-6. [PMID: 25470723 PMCID: PMC4300267 DOI: 10.1002/anie.201410443] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Indexed: 11/06/2022]
Abstract
An enantioselective total synthesis of the polycyclic diterpene (+)-chatancin, a potent PAF antagonist, is reported. Proceeding in seven steps from dihydrofarnesal, this synthetic route was designed to circumvent macrocyclization-based strategies to complex, cyclized cembranoids. The described synthesis requires only six chromatographic purifications, is high yielding, and avoids protecting-group manipulations. An X-ray crystal structure of this fragile marine natural product was obtained.
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Affiliation(s)
- Yu-Ming Zhao
- Department of Chemistry, University of California, Berkeley, 826 Latimer Hall, Berkeley, CA 94720 (USA)
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48
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Kang TC, Zhao X, Sha F, Wu XY. Highly enantioselective direct allylic alkylation of butenolides with Morita–Baylis–Hillman carbonates catalyzed by chiral squaramide-phosphine. RSC Adv 2015. [DOI: 10.1039/c5ra14667d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Asymmetric vinylogous allylic alkylation of β,γ-butenolides with Morita–Baylis–Hillman carbonates has been developed to construct γ,γ-disubstituted butenolides containing adjacent quaternary and tertiary chiral centers.
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Affiliation(s)
- Tian-Chen Kang
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- East China University of Science and Technology
- Shanghai 200237
- P. R. China
| | - Xuan Zhao
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- East China University of Science and Technology
- Shanghai 200237
- P. R. China
| | - Feng Sha
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- East China University of Science and Technology
- Shanghai 200237
- P. R. China
| | - Xin-Yan Wu
- Key Laboratory for Advanced Materials and Institute of Fine Chemicals
- East China University of Science and Technology
- Shanghai 200237
- P. R. China
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49
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Flórez LV, Biedermann PHW, Engl T, Kaltenpoth M. Defensive symbioses of animals with prokaryotic and eukaryotic microorganisms. Nat Prod Rep 2015; 32:904-36. [DOI: 10.1039/c5np00010f] [Citation(s) in RCA: 233] [Impact Index Per Article: 25.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Many organisms team up with symbiotic microbes for defense against predators, parasites, parasitoids, or pathogens. Here we review the known defensive symbioses in animals and the microbial secondary metabolites responsible for providing protection to the host.
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Affiliation(s)
- Laura V. Flórez
- Max Planck Institute for Chemical Ecology
- Insect Symbiosis Research Group
- 07745 Jena
- Germany
| | - Peter H. W. Biedermann
- Max Planck Institute for Chemical Ecology
- Insect Symbiosis Research Group
- 07745 Jena
- Germany
| | - Tobias Engl
- Max Planck Institute for Chemical Ecology
- Insect Symbiosis Research Group
- 07745 Jena
- Germany
| | - Martin Kaltenpoth
- Max Planck Institute for Chemical Ecology
- Insect Symbiosis Research Group
- 07745 Jena
- Germany
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50
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Jadhav AP, Bhaskara Rao VU, Singh P, Gonnade RG, Singh RP. Asymmetric vinylogous Michael reaction of cyclic enones with silyloxy furans. Chem Commun (Camb) 2015; 51:13941-4. [DOI: 10.1039/c5cc05617a] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A chiral, primary diamine catalyzed enantioselective vinylogous Michael reaction of cyclohexenone/medium and large cyclic enones with various 2-silyloxyfuran has been explored.
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Affiliation(s)
- Amol P. Jadhav
- Department of Chemistry
- Indian Institute of Technology
- New Delhi 110-016
- India
| | - V. U. Bhaskara Rao
- Department of Chemistry
- Indian Institute of Technology
- New Delhi 110-016
- India
| | - Pradeep Singh
- Department of Chemistry
- Indian Institute of Technology
- New Delhi 110-016
- India
| | - R. G. Gonnade
- Center for Materials Characterization
- National Chemical Laboratory
- Pune 411-008
- India
| | - Ravi P. Singh
- Department of Chemistry
- Indian Institute of Technology
- New Delhi 110-016
- India
| |
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