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Zaki AA, El-Amier YA, Ashour A. Two new cytotoxic tetralin derivatives from Panicum turgidum. Nat Prod Res 2022; 37:1595-1600. [PMID: 35867043 DOI: 10.1080/14786419.2022.2103121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Two new tetralin compounds were isolated from the aerial parts of Panicum turgidum Forssk. Their structures were elucidated by comprehensive 1 D and 2 D NMR experiments as well as high resolution ESI mass spectrometry. In addition, these two compounds have been tested for in vitro cytotoxicity against SKOV3 (Ovarian Carcinoma) and BT-549 (Breast Carcinoma). Compound 1 showed good cytotoxic activities against SKOV3 and BT 549 with IC50 value of 5.65 ± 0.31 and 10.3 ± 0.56 µg/mL, respectively.
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Affiliation(s)
- Ahmed A Zaki
- Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt.,Department of Pharmacognosy, Faculty of Pharmacy, Horus University-Egypt, New Damietta, Egypt
| | - Yasser A El-Amier
- Botany Department, Ecology, Faculty of Science, Mansoura University, Mansoura, Egypt
| | - Ahmed Ashour
- Department of Pharmacognosy, Faculty of Pharmacy, Mansoura University, Mansoura, Egypt.,Department of Pharmacognosy, Faculty of Pharmacy, Horus University-Egypt, New Damietta, Egypt
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Neufeld J, Stünkel T, Mück-Lichtenfeld C, Daniliuc CG, Gilmour R. Trifluorinated Tetralins via I(I)/I(III)-Catalysed Ring Expansion: Programming Conformation by [CH 2 CH 2 ] → [CF 2 CHF] Isosterism. Angew Chem Int Ed Engl 2021; 60:13647-13651. [PMID: 33721384 PMCID: PMC8251640 DOI: 10.1002/anie.202102222] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Revised: 03/12/2021] [Indexed: 12/15/2022]
Abstract
Saturated, fluorinated carbocycles are emerging as important modules for contemporary drug discovery. To expand the current portfolio, the synthesis of novel trifluorinated tetralins has been achieved. Fluorinated methyleneindanes serve as convenient precursors and undergo efficient difluorinative ring expansion with in situ generated p‐TolIF2 (>20 examples, up to >95 %). A range of diverse substituents are tolerated under standard catalysis conditions and this is interrogated by Hammett analysis. X‐ray analysis indicates a preference for the CH−F bond to occupy a pseudo‐axial orientation, consistent with stabilising σC−H→σC−F* interactions. The replacement of the symmetric [CH2−CH2] motif by [CF2−CHF] removes the conformational degeneracy intrinsic to the parent tetralin scaffold leading to a predictable half‐chair. The conformational behavior of this novel structural balance has been investigated by computational analysis and is consistent with stereoelectronic theory.
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Affiliation(s)
- Jessica Neufeld
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 36, 48149, Münster, Germany
| | - Timo Stünkel
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 36, 48149, Münster, Germany
| | - Christian Mück-Lichtenfeld
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 36, 48149, Münster, Germany
| | - Constantin G Daniliuc
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 36, 48149, Münster, Germany
| | - Ryan Gilmour
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster, Corrensstraße 36, 48149, Münster, Germany
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Chang HZ, Li JQ, Du S, Shen KY, Yang Q, Yi H, Zhang JW. Transformation Characteristics of Hydrogen-Donor Solvent Tetralin in the Process of Direct Coal Liquefaction. Front Chem 2019; 7:737. [PMID: 31737609 PMCID: PMC6839129 DOI: 10.3389/fchem.2019.00737] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2019] [Accepted: 10/16/2019] [Indexed: 11/13/2022] Open
Abstract
The aim of this study is to investigate the transformation of hydrogen-donor solvent tetralin in the direct liquefaction process of coal. Pure tetralin liquid as well as mixture of tetralin and Wucaiwan coal (WCW) were separately reacted under a liquefaction condition, and constituents of liquid product were analyzed by GC-MS. The results show that after the tetralin liquid reacts with high-pressure hydrogen, 90% of the reaction product is in liquid state, the gaseous products mainly include alkane gas and COx gas. When the reaction temperatures were set at 380 and 420°C, respectively, the corresponding transformation rates of tetralin can be 34.72 and 52.74%. At 380°C, the tetralin mainly plays a role of passing active hydrogen, while at 420°C, it mainly occurs dehydrogenation transformation to provide active hydrogen, as well as generate naphthalene, methyl indan, and substituted benzene, etc. Taking tetralin as the hydrogen-donor solvent, the WCW was performed liquefaction reaction, and the obtained results show that the transformation rates of tetralin are 69.76 and 83.86% at liquefaction temperatures of 380 and 420°C, respectively. Tetralin mainly occur to dehydrogenation transformation to generate naphthalene, followed by methyl indan, where contents order of main constituents of the liquefaction products were: naphthalene> tetralin > methyl indan.
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Affiliation(s)
- Hai-Zhou Chang
- College of Science, University of Shanghai for Science and Technology, Shanghai, China
| | - Jun-Qi Li
- College of Science, University of Shanghai for Science and Technology, Shanghai, China
| | - Shuai Du
- SGS-CSTC Standards Technical Services Co., Ltd, Shenzhen, China
| | - Kai-Yuan Shen
- College of Science, University of Shanghai for Science and Technology, Shanghai, China
| | - Qun Yang
- School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai, China
| | - Han Yi
- College of Science, University of Shanghai for Science and Technology, Shanghai, China
| | - Ji-Wei Zhang
- College of Science, University of Shanghai for Science and Technology, Shanghai, China
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Floriano B, Santero E, Reyes-Ramírez F. Biodegradation of Tetralin: Genomics, Gene Function and Regulation. Genes (Basel) 2019; 10:E339. [PMID: 31064110 DOI: 10.3390/genes10050339] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Revised: 04/26/2019] [Accepted: 04/30/2019] [Indexed: 01/18/2023] Open
Abstract
Tetralin (1,2,3,4-tetrahydonaphthalene) is a recalcitrant compound that consists of an aromatic and an alicyclic ring. It is found in crude oils, produced industrially from naphthalene or anthracene, and widely used as an organic solvent. Its toxicity is due to the alteration of biological membranes by its hydrophobic character and to the formation of toxic hydroperoxides. Two unrelated bacteria, Sphingopyxis granuli strain TFA and Rhodococcus sp. strain TFB were isolated from the same niche as able to grow on tetralin as the sole source of carbon and energy. In this review, we provide an overview of current knowledge on tetralin catabolism at biochemical, genetic and regulatory levels in both strains. Although they share the same biodegradation strategy and enzymatic activities, no evidences of horizontal gene transfer between both bacteria have been found. Moreover, the regulatory elements that control the expression of the gene clusters are completely different in each strain. A special consideration is given to the complex regulation discovered in TFA since three regulatory systems, one of them involving an unprecedented communication between the catabolic pathway and the regulatory elements, act together at transcriptional and posttranscriptional levels to optimize tetralin biodegradation gene expression to the environmental conditions.
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Abstract
Ovafolinins A and B, isolated from Lyonia ovalifolia var. elliptica, are lignans that contain a unique bridged structure containing a penta- and tetracyclic benzoxepin and an aryl tetralin. We report the first total synthesis of these natural products in which an acyl-Claisen rearrangement was initially utilized to construct the lignan backbone with correct relative stereochemistry. Judicious use of a bulky protecting group placed reactive moieties in the correct orientation, thereby resulting in a cascade reaction to form the bridged benzoxepin/aryl tetralin from a linear precursor in a single step. Modification of this route allowed the enantioselective synthesis of (+)-ovafolinins A and B, which confirmed the absolute stereochemistry, and comparison of optical rotation suggests that these compounds are found as scalemic mixtures in nature.
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Affiliation(s)
- Samuel J Davidson
- School of Chemical Sciences, University of Auckland, 23 Symonds St., Auckland, New Zealand
| | - David Barker
- School of Chemical Sciences, University of Auckland, 23 Symonds St., Auckland, New Zealand
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Gogoi D, Devi R, Pahari P, Sarma B, Das SK. cis-Diastereoselective synthesis of chroman-fused tetralins as B-ring-modified analogues of brazilin. Beilstein J Org Chem 2016; 12:2816-2822. [PMID: 28144354 PMCID: PMC5238543 DOI: 10.3762/bjoc.12.280] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Accepted: 11/28/2016] [Indexed: 11/23/2022] Open
Abstract
We have synthesized a series of cis-6a,7,8,12b-tetrahydro-6H-naphtho[2,1-c]chromen-6a-ols as B-ring-modified analogues of (±)-brazilin. A completely regio- and cis-diastereoselective intramolecular Friedel–Crafts epoxy–arene cyclization of 1-tetralone-derived glycidyl ethers catalyzed by Brønsted acids was used as the key step. Our worries concerning the formation of cis–trans product mixtures and their probable conversion to naphthopyran derivatives via dehydration of the tertiary hydroxy group were laid to rest. Additionally, the angular hydroxy group of one of the synthesized products has been reductively removed by a diastereoselective method which should be useful in future for preparing libraries of chroman-fused tetralins with trans-stereochemistry at the ring junction.
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Affiliation(s)
- Dimpee Gogoi
- Department of Chemical Sciences, Tezpur University, Napaam, Tezpur 784028, Assam, India
| | - Runjun Devi
- Department of Chemical Sciences, Tezpur University, Napaam, Tezpur 784028, Assam, India
| | - Pallab Pahari
- Chemical Science and Technology Division, CSIR-North East Institute of Science & Technology, Jorhat 785006, Assam, India
| | - Bipul Sarma
- Department of Chemical Sciences, Tezpur University, Napaam, Tezpur 784028, Assam, India
| | - Sajal Kumar Das
- Department of Chemical Sciences, Tezpur University, Napaam, Tezpur 784028, Assam, India
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Ma B, Guckian KM, Lin EYS, Lee WC, Scott D, Kumaravel G, Macdonald TL, Lynch KR, Black C, Chollate S, Hahm K, Hetu G, Jin P, Luo Y, Rohde E, Rossomando A, Scannevin R, Wang J, Yang C. Stereochemistry-activity relationship of orally active tetralin S1P agonist prodrugs. Bioorg Med Chem Lett 2010; 20:2264-9. [PMID: 20188554 PMCID: PMC2843818 DOI: 10.1016/j.bmcl.2010.02.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2009] [Revised: 01/31/2010] [Accepted: 02/02/2010] [Indexed: 11/28/2022]
Abstract
Modifying FTY720, an immunosuppressant modulator, led to a new series of well phosphorylated tetralin analogs as potent S1P1 receptor agonists. The stereochemistry effect of tetralin ring was probed, and (-)-(R)-2-amino-2-((S)-6-octyl-1,2,3,4-tetrahydronaphthalen-2-yl)propan-1-ol was identified as a good SphK2 substrate and potent S1P1 agonist with good oral bioavailability.
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Affiliation(s)
- Bin Ma
- BiogenIdec Inc., 14 Cambridge Center, Cambridge, MA 02142, USA.
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