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Aitouna AO, Belghiti M, Eşme A, Aitouna AO, Salah M, Chekroun A, El Alaoui El Abdallaoui H, Benharref A, Mazoir N, Zeroual A, Nejjari C. Divulging the regioselectivity of epoxides in the ring-opening reaction, and potential himachalene derivatives predicted to target the antibacterial activities and SARS-CoV-2 spike protein with docking study. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130864] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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2
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Ait El Had M, Oukhrib A, Zaki M, Taourirte M, Benharref A, Urrutigoïty M. BF3·OEt2-Catalyzed Rearrangement of Epoxy-Himachalenes: Access to New Biosourced N-Acetamide-Based Himachalenes. Synlett 2020. [DOI: 10.1055/s-0040-1706545] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
AbstractBiosourced N-acetamide-based himachalenes were synthesized by Lewis acid catalyzed rearrangement of epoxy-himachalene derived from α-cis- and β-himachalenes, the main component of essential oil of Atlas cedar (Cedrus atlantica). Several new chiral polycyclic N-acetamide compounds were obtained with different selectivities depending on the acid used. Among the Lewis acids used, BF3·OEt2 under catalytic and mild conditions is efficient and selective affording the formation of chiral N-acetamides in good yields. Otherwise, using acetonitrile as solvent and reagent was proved as an efficient tool giving access to new N-acetamide-based himachalenes. A mechanism to explain the formation of the different compounds observed in the reaction mixture has also been proposed.
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Affiliation(s)
- Mustapha Ait El Had
- Laboratoire de Chimie des Substances Naturelles, Faculté des Sciences Semlalia, Université Cadi Ayyad
- Laboratoire de Chimie Bioorganique et Macromoléculaire, Faculté des Sciences et Techniques de Marrakech (FSTGM), Université Cadi Ayyad
| | - Abdelouahd Oukhrib
- Laboratoire de Chimie des Substances Naturelles, Faculté des Sciences Semlalia, Université Cadi Ayyad
- Laboratoire de Chimie de Coordination (LCC), Université de Toulouse, CNRS
| | - Mohamed Zaki
- Laboratoire de Chimie Bioorganique et Macromoléculaire, Faculté des Sciences et Techniques de Marrakech (FSTGM), Université Cadi Ayyad
| | - Moha Taourirte
- Laboratoire de Chimie Bioorganique et Macromoléculaire, Faculté des Sciences et Techniques de Marrakech (FSTGM), Université Cadi Ayyad
| | - Ahmed Benharref
- Laboratoire de Chimie des Substances Naturelles, Faculté des Sciences Semlalia, Université Cadi Ayyad
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3
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Understanding the Mechanism and Selectivities of the Reaction of Meta-Chloroperbenzoic Acid and Dibromocarbene with β-Himachalene: A DFT Study. HETEROATOM CHEMISTRY 2020. [DOI: 10.1155/2020/8885991] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
This study was performed to understand the site selectivity in the reaction between β-himachalene and meta-chloroperbenzoic acid (m-CPBA) in the first step followed by the addition of dibromocarbene (CBr2) to the main monoepoxidation product Pα formed in the first reaction. Calculations were performed using the Becke three-parameter hybrid exchange functional and the Lee–Yang–Parr correlation functional (B3LYP) with the 6-311 + G (d, p) basis set. Transition states were located by QST2, and their highlighting was validated by the existence of only one imaginary frequency in the Hessian matrix. The action of m-CPBA on β-himachalene was analyzed on the two double bonds of β-himachalene whose theoretical calculations show that the attack affects the most substituted double bond on α side containing hydrogen of ring junction. The obtained Pα product thereafter treated with dibromocarbene leads via an exothermic reaction to the six-membered ring double bond position of α-monoepoxide. The major products Pαα are kinetically and thermodynamically favored with a high stereoselectivity in perfect correlation with the experimental observations.
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4
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Rearrangement of Epoxide Derivatives Semisynthesized from β-Himachalene using Lewis and Bronsted Acids Catalysis. Chem Nat Compd 2020. [DOI: 10.1007/s10600-020-03116-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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5
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Rodríguez-García G, Villagómez-Guzmán AK, Talavera-Alemán A, Cruz-Corona R, Gómez-Hurtado MA, Cerda-García-Rojas CM, Joseph-Nathan P, Del Río RE. Conformational, configurational, and supramolecular studies of podocephalol acetate from Lasianthaea aurea. Chirality 2019; 31:923-933. [PMID: 31454433 DOI: 10.1002/chir.23042] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2018] [Revised: 11/19/2018] [Accepted: 11/20/2018] [Indexed: 11/06/2022]
Abstract
Although podocephalol (1) and its derived acetate 2 were found in Lasianthaea podocephala four decades ago, and 1 was later detected in the essential oils of several vegetal species, its absolute configuration (AC) and conformational preferences remained to be established. The structures of ar-himachalene 1, now isolated from Lasianthaea aurea, and its derived acetate 2, were herein confirmed by extensive 1D and 2D nuclear magnetic resonance (NMR) studies, while the conformational preferences of the cycloheptene was established by density functional theory (DFT) calculations, which in combination with vibrational circular dichroism measurements provided the (R) absolute configuration of the molecules. The structure and AC were further verified through the Flack and Hooft parameters calculations derived from single crystal X-ray diffraction data of 2. In addition, careful evaluation of the crystal data allowed observing supramolecular layers cell package, an uncommon property in natural terpenes that might have potential applications. A transmission electron microscopy analysis of crystal of 2 was also possible, providing its physical characteristics at the micrometric scale.
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Affiliation(s)
- Gabriela Rodríguez-García
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, Mexico
| | - Ana K Villagómez-Guzmán
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, Mexico
| | - Armando Talavera-Alemán
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, Mexico
| | - Rosalba Cruz-Corona
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, Mexico
| | - Mario A Gómez-Hurtado
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, Mexico
| | - Carlos M Cerda-García-Rojas
- Departamento de Química, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Mexico City, Mexico
| | - Pedro Joseph-Nathan
- Departamento de Química, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Mexico City, Mexico
| | - Rosa E Del Río
- Instituto de Investigaciones Químico Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, Mexico
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6
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Benharref A, Oukhrib A, Ait Elhad M, El Ammari L, Saadi M, Berraho M. 1,6-Diacetyl-2-isopropyl-4,7-dimethylnaphthalene. IUCRDATA 2016. [DOI: 10.1107/s2414314616007033] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The title compound, C19H22O2, was synthesized in three steps from a mixture of α-, β- and γ-himachalene, which was isolated from an essential oil of the Atlas cedar (Cedrus atlantica). In the crystal, molecules are linked by C—H...O hydrogen bonds into chains running parallel to thebaxis.
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7
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Yang M, Dong H, Jiang J, Wang M. Synthesis and Fungicidal Activities of (Z/E)-3,7-Dimethyl-2,6-octadienamide and Its 6,7-Epoxy Analogues. Molecules 2015; 20:21023-36. [PMID: 26610465 PMCID: PMC6331855 DOI: 10.3390/molecules201219743] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2015] [Revised: 11/17/2015] [Accepted: 11/17/2015] [Indexed: 11/17/2022] Open
Abstract
In order to find new lead compounds with high fungicidal activity, (Z/E)-3,7-dimethyl-2,6-octadienoic acids were synthesized via selective two-step oxidation using the commercially available geraniol/nerol as raw materials. Twenty-eight different (Z/E)-3,7-dimethyl-2,6-octadienamide derivatives were prepared by reactions of (Z/E)-carboxylic acid with various aromatic and aliphatic amines, followed by oxidation of peroxyacetic acid to afford their 6,7-epoxy analogues. All of the compounds were characterized by HR-ESI-MS and 1H-NMR spectral data. The preliminary bioassays showed that some of these compounds exhibited good fungicidal activities against Rhizoctonia solani (R. solani) at a concentration of 50 µg/mL. For example, 5C, 5I and 6b had 94.0%, 93.4% and 91.5% inhibition rates against R. solani, respectively. Compound 5f displayed EC50 values of 4.3 and 9.7 µM against Fusahum graminearum and R. Solani, respectively.
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Affiliation(s)
- Mingyan Yang
- Department of Applied Chemistry, China Agricultural University, Beijing 100193, China.
| | - Hongbo Dong
- Department of Applied Chemistry, China Agricultural University, Beijing 100193, China.
| | - Jiazhen Jiang
- Department of Applied Chemistry, China Agricultural University, Beijing 100193, China.
| | - Mingan Wang
- Department of Applied Chemistry, China Agricultural University, Beijing 100193, China.
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Lin KW, Maitraie D, Huang AM, Wang JP, Lin CN. Triterpenoids and an alkamide from Ganoderma tsugae. Fitoterapia 2015; 108:73-80. [PMID: 26598137 DOI: 10.1016/j.fitote.2015.11.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2015] [Revised: 11/09/2015] [Accepted: 11/11/2015] [Indexed: 01/08/2023]
Abstract
Ganoderma tsugae is a medicinal mushroom. In a continual study on the bioactive constituents of this fungus, a new lanostanoid, 3β-acetoxy-16α-hydroxy-24ξ-methyl-5α-lanosta-8,25-dien-21-oic acid, named tsugaric acid F (1) and a novel palmitamide, N-(3'α,4'β-dihydroxy-2'β-(hydroxymethyl)-1'β-(cyclobutyl)palmitamide (2) were isolated and characterized from the fruit bodies of G. tsugae, and three novel seco-lanostanoids, 3,4-seco-8α,9α-epoxy-5α-lanosta-21-oic acid 3,4 lactone (5), 3,4-seco-5β-lanosta-7,9(11),4(29)-trien-3,21-dioic acid-3-methyl ester (6), 3,4-seco-5β-lanosta-7,9(11),4(29)-trien-3,21-dioic acid (7), and a known compound, 3-oxo-5α-lanosta-8-en-21-oic acid (4) were prepared from 3. The structures of new compounds, 1, 2, 5-7 were determined by spectroscopic methods. Compounds 1 and 4 showed inhibitory effects on xanthine oxidase (XO) with an IC50 values of 313.3 ± 80.0 and 43.9 ± 29.9 μM, respectively when 7 exhibited potent inhibitory effect on superoxide anion generation in rat neutrophils stimulated with formyl-Met-Leu-Phe (fMLP)/cytochalasin B (CB) with an IC50 values of 1.3 ± 0.2 μM. Compounds 4-7 showed weak cytotoxic activities against PC3 cells. These results indicated that 4 and 7 may be used as cancer chemopreventive agents.
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Affiliation(s)
- Kai-Wei Lin
- School of Pharmacy, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
| | - Dravidum Maitraie
- School of Pharmacy, Kaohsiung Medical University, Kaohsiung 80708, Taiwan
| | - A-Mei Huang
- Graduate Institute of Clinical Medicine, College of Medicine, Kaohsiung Medical University, 80708, Taiwan
| | - Jih-Pyang Wang
- Department of Education and Research, Taichung Veterans General Hospital, Taichung 40705, Taiwan
| | - Chun-Nan Lin
- Faculty of Fragrance and Cosmetics, College of Pharmacy, Kaohsiung Medical University, Kaohsiung 80708, Taiwan; Department of Medical Research, Kaohsiung Medical University Chung-Ho Memorial Hospital, Kaohsiung 80708, Taiwan.
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9
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Huang AC, Sumby CJ, Tiekink ERT, Taylor DK. Synthesis of guaia-4(5)-en-11-ol, guaia-5(6)-en-11-ol, aciphyllene, 1-epi-melicodenones C and E, and other guaiane-type sesquiterpenoids via the diastereoselective epoxidation of guaiol. JOURNAL OF NATURAL PRODUCTS 2014; 77:2522-2536. [PMID: 25330459 DOI: 10.1021/np500611z] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The diastereomeric ratio of epoxidation of the internally bridged carbon-carbon double bond of guaiol (1a) is strongly influenced by the combined effects of the types of remote protecting groups on the hydroxyisopropyl side chain, choice of solvent, and epoxidizing reagent. This observation has allowed us to devise concise stereoselective syntheses of a range of guaiane-type sesquiterpenoids via an epoxidation, ring-opening/elimination, and functionality manipulation sequence. Natural products guaia-4(5)-en-11-ol (2a), guaia-5(6)-en-11-ol (3), and aciphyllene (4a) and epimers of the recently isolated natural products, 1-epi-guaia-4(5)-en-11-ol (2b), 1-epi-aciphyllene (4b), and 1-epi-melicodenones C (5a) and E (6a), were synthesized in good yields in relatively few steps.
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Affiliation(s)
- An-Cheng Huang
- School of Agriculture, Food and Wine, The University of Adelaide , Waite Campus, Glen Osmond 5064, Adelaide, South Australia, Australia
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10
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Loubidi M, Agustin D, Benharref A, Poli R. Solvent-free epoxidation of himachalenes and their derivatives by TBHP using [MoO2(SAP)]2 as a catalyst. CR CHIM 2014. [DOI: 10.1016/j.crci.2014.01.023] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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11
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Ourhriss N, Benharref A, Oukhrib A, Daran JC, Berraho M. (1S,3R,8R)-2,2-Di-chloro-3,7,7,10-tetra-methyl-tri-cyclo-[6.4.0.0(1,3)]dodec-9-en-11-one. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o830. [PMID: 23795020 PMCID: PMC3684918 DOI: 10.1107/s1600536813011781] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2013] [Accepted: 04/30/2013] [Indexed: 11/30/2022]
Abstract
The title compound, C16H22Cl2O, was synthesized from β-himachalene (3,5,5,9-tetramethyl-2,4a,5,6,7,8-hexahydro-1H-benzocycloheptene), which was isolated from the essential oil of the Atlas cedar (Cedrus Atlantica). The molecule is built up from fused six- and seven-membered rings and an additional three-membered ring arising from the reaction of himachalene with dichlorocarbene. The six-membered ring has an envelope conformation, with the C atom belonging to the three-membered ring forming the flap, whereas the seven-membered ring displays a screw-boat conformation; the dihedral angle between the rings (all atoms) is 59.65 (14)°.
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Affiliation(s)
- Naja Ourhriss
- Laboratoire de Chimie des Substances Naturelles, "Unité Associé au CNRST (URAC16)", Faculté des Sciences Semlalia, BP 2390 Bd My Abdellah, 40000 Marrakech, Morocco
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12
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Oukhrib A, Benharref A, Saadi M, Berraho M, El Ammari L. (1S,3R,8R,9R,10S)-2,2-Dibromo-3,7,7,10-tetra-methyl-9β,10β-ep-oxy-3,7,7,10-tetra-methyl-tricyclo-[6.4.0.0(1,3)]dodeca-ne. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o521-2. [PMID: 23634065 PMCID: PMC3629578 DOI: 10.1107/s1600536813006077] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2013] [Accepted: 03/03/2013] [Indexed: 12/05/2022]
Abstract
The title compound, C16H24Br2O, was synthesized from β-himachalene (3,5,5,9-tetramethyl-2,4a,5,6,7,8-hexahydro-1H-benzocycloheptene), which was isolated from the essential oil of the Atlas cedar (Cedrus atlantica). The molecule contains fused six- and seven-membered rings, each linked to a three-membered ring. The six-membered ring has a half-chair conformation, while the seven-membered ring displays a chair conformation. The dihedral angle between the mean planes through the six- and seven-membered rings is 39.55 (12)°. The two three-membered rings, linked to the six- and seven-membered rings, are nearly perpendicular to the six-membered ring, making dihedral angles of 78.6 (2) and 80.5 (2)°, respectively. The absolute structure was established unambiguously from anomalous dispersion effects. In the crystal, each molecule is linked to its symmetry-equivalent partner by C—H⋯O hydrogen bonds, forming zigzag chains parallel to [100].
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Affiliation(s)
- Abdelouahd Oukhrib
- Laboratoire de Chimie Biomoléculaire, Substances Naturelles et Réactivité "Unité Associée au CNRST (URAC16)", Faculté des Sciences Semlalia, BP 2390, Bd My Abdellah, 40000 Marrakech, Morocco
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13
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Oukhrib A, Benharref A, Saadi M, Berraho M, El Ammari L. 2,2-Dichloro-3,7,7,11-tetra-methyl-10-aza-tetra-cyclo-[6.5.0.0(1,3).0(9,11)]trideca-ne. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o589-90. [PMID: 23634120 PMCID: PMC3629633 DOI: 10.1107/s1600536813007642] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2013] [Accepted: 03/19/2013] [Indexed: 11/10/2022]
Abstract
The title compound, C16H25Cl2N, was synthesized from β-himachalene (3,5,5,9-tetramethyl-2,4a,5,6,7,8-hexahydro-1H-benzocycloheptene), which was isolated from the essential oil of the Atlas cedar (Cedrus Atlantica). The molecule is built up from fused six- and seven-membered rings linked to two three-membered rings. The six-membered ring shows a half-chair conformation, whereas the seven-membered ring displays a boat conformation. The dihedral angle between the mean planes through the six- and seven-membered rings is 59.8 (2)°. The two three-membered rings lie to one side and each is nearly perpendicular to the six-membered ring, forming dihedral angles of 83.2 (2) and 86.0 (2)°. The absolute structure was established unambiguously from anomalous dispersion effects. No specific intermolecular interactions are noted in the crystal structure.
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Affiliation(s)
- Abdelouahd Oukhrib
- Laboratoire de Chimie Biomoléculaire, Substances Naturelles et, Réactivité "Unité Associée au CNRST (URAC16)", Université Cadi Ayyad, Faculté des Sciences Semlalia, BP 2390, Bd My Abdellah, 40000 Marrakech, Morocco
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14
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Ourhriss N, Benharref A, Saadi M, El Ammari L, Berraho M. (1S,3R,8R,9S,11R)-2,2,10,10-Tetra-chloro-3,7,7,11-tetra-methyl-tetra-cyclo-[6.5.0.0(1,3).0(9,11)]trideca-ne. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o275. [PMID: 23424548 PMCID: PMC3569802 DOI: 10.1107/s1600536813001700] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Accepted: 01/16/2013] [Indexed: 11/10/2022]
Abstract
The title compound, C(17)H(24)Cl(4), was synthesized from β-himachalene (3,5,5,9-tetra-methyl-2,4a,5,6,7,8-hexa-hydro-1H-benzocyclo-heptene), which was isolated from the essential oil of the Atlas cedar (Cedrus Atlantica). The mol-ecule is built up from fused six- and seven-membered rings and two three-membered rings from the reaction of β-himachalene with dichloro-carbene. The six-membered ring shows a chair conformation, whereas the seven-membered ring displays a boat conformation.
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Affiliation(s)
- Najia Ourhriss
- Laboratoire de Chimie Biomoléculaire, Substances Naturelles et Réactivité "Unité Associée au CNRST(URAC16)", Faculté des Sciences Semlalia, BP 2390, Bd My Abdellah, 40000 Marrakech, Morocco
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15
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Oukhrib A, Benharref A, Saadi M, Daran JC, Berraho M. (1 S,3 R,8 R)-2,2-Dibromo-10-bromomethyl-3,7,7-trimethyltricyclo[6.4.0.0 1,3]dodec-9-ene. Acta Crystallogr Sect E Struct Rep Online 2012; 68:o3394-5. [PMID: 23476222 PMCID: PMC3588986 DOI: 10.1107/s1600536812046430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Accepted: 11/09/2012] [Indexed: 11/18/2022]
Abstract
The title compound, C16H23Br3, was synthesized from β-himachalene (3,5,5,9-tetramethyl-2,4a,5,6,7,8-hexahydro-1H-benzocycloheptene), which was isolated from the essential oil of the Atlas cedar (Cedrus Atlantica). The molecule is built up from fused six- and seven-membered rings and an additional three-membered ring from the reaction of himachalene with dibromocarbene. The six-membered ring has an envelope conformation (the flap atom being the C atom shared with the three-membered ring, whereas the seven-membered ring displays a screw boat conformation; the dihedral angle between the rings (defined by the near coplanar atoms) is 56.5 (2)°.
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16
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Oukhrib A, Benharref A, Saadi M, El Ammari L, Berraho M. (1S,3R,8R)-2,2-Dibromo-3,7,7,10-tetra-methyltricyclo-[6.4.0.0(1,3)]dodec-9-en-11-one. Acta Crystallogr Sect E Struct Rep Online 2012; 68:o3341-2. [PMID: 23476179 PMCID: PMC3588943 DOI: 10.1107/s1600536812046089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Accepted: 11/07/2012] [Indexed: 11/11/2022]
Abstract
The title compound, C16H22Br2O, was synthesized from β-himachalene (3,5,5,9-tetramethyl-2,4a,5,6,7,8-hexahydro-1H-benzocycloheptene), which was isolated from the essential oil of the Atlas cedar (Cedrus Atlantica). The molecule is built up from fused six- and seven-membered rings and an additional three-membered ring from the reaction of himachalene with dibromocarbene. The six-membered ring has an envelope conformation, with the C atom belonging to the three-membered ring forming the flap, whereas the seven-membered ring displays a screw-boat conformation; the dihedral angle between the rings (all atoms) is 60.92 (16)°.
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Affiliation(s)
- Abdelouahd Oukhrib
- Laboratoire de Chimie des Substances Naturelles, "Unité Associé au CNRST (URAC16)", Faculté des Sciences Semlalia, BP 2390 Bd My Abdellah, 40000 Marrakech, Morocco
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17
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Benharref A, El Ammari L, Lassaba E, Ourhriss N, Berraho M. (1S,3R,8R)-2,2-Dibromo-3,7,7,10-tetra-methyl-tricyclo-[6.4.0.0(1,3)]dodec-9-ene. Acta Crystallogr Sect E Struct Rep Online 2012; 68:o2502. [PMID: 22904942 PMCID: PMC3414955 DOI: 10.1107/s1600536812032333] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2012] [Accepted: 07/16/2012] [Indexed: 11/24/2022]
Abstract
The title compound, C16H24Br2, was synthesized from β-himachalene (3,5,5,9-tetramethyl-2,4a,5,6,7,8-hexahydro-1H-benzocycloheptene), which was isolated from the essential oil of the Atlas cedar (Cedrus Atlantica). The molecule is built up from two fused six- and seven-membered rings and an additional three-membered ring from the reaction of β-himachalene with dibromocarbene. The six-membered ring shows a screw-boat conformation, whereas the seven-membered ring displays a boat conformation; the dihedral angle between the mean planes through the rings is 57.9 (4)°. The absolute structure was established unambiguously from anomalous dispersion effects.
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Chakkar M, Oughris N, Benharref A, Daran JC, Berraho M. 1-Isopropyl-4,7-dimethyl-2,8-dinitro-naphthalene. Acta Crystallogr Sect E Struct Rep Online 2012; 68:o1893. [PMID: 22719649 PMCID: PMC3379451 DOI: 10.1107/s1600536812021514] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2012] [Accepted: 05/11/2012] [Indexed: 11/16/2022]
Abstract
The title compound, C15H16N2O4, was synthesized from a mixture of α-himachalene (2-methylene-6,6,9-trimethylbicyclo[5.4.O1,7]undec-8-ene) and β-himachalene (2,6,6,9-tetramethylbicyclo[5.4.01,7]undeca-1,8-diene) which were isolated from an oil of the Atlas cedar (Cedrus atlantica). The asymmetric unit contains two independent molecules. In each of the two molecules, two O atoms of one nitro group are disordered over two sets of sites with site-occupancy factors of 0.636 (5):0.364 (5) and 0.832 (5):0.168 (5). The crystal structure features weak C—H⋯O hydrogen bonds.
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Benharref A, Lassaba E, Avignant D, Oudahmane A, Berraho M. (1 S,3 R,8 R,11 S)-2,2-Dichloro-3,7,7,10-tetramethyltricyclo[6.4.0.0 1,3]dodec-9-en-11-ol. Acta Crystallogr Sect E Struct Rep Online 2011; 67:o615. [PMID: 21522372 PMCID: PMC3052100 DOI: 10.1107/s1600536811004788] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2011] [Accepted: 02/08/2011] [Indexed: 11/30/2022]
Abstract
The title compound, C16H24Cl2O, was synthesized from β-himachalene (3,5,5,9-tetramethyl-2,4a,5,6,7,8-hexahydro-1H-benzocycloheptene), which was isolated from essential oil of the Atlas cedar (Cedrus atlantica). The two fused rings exhibit different conformations: the six-membered ring has a screw-boat conformation, while the seven-membered ring displays a boat conformation. The dihedral angle between the two rings is 56.56 (18)°. In the crystal, molecules aggregate into supramolecular chains along the c axis mediated by O—H⋯O hydrogen bonds.
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Benharref A, Lassaba E, Avignant D, Oudahmane A, Berraho M. (1S,3R,8R)-9-(1-Amino-ethyl-idene)-2,2-dichloro-3,7,7-trimethyl-tricyclo-[6.4.0.0]undecan-10-one. Acta Crystallogr Sect E Struct Rep Online 2011; 67:o645-o646. [PMID: 21522398 PMCID: PMC3052109 DOI: 10.1107/s1600536811005307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2011] [Accepted: 02/12/2011] [Indexed: 05/30/2023]
Abstract
The title compound, C(16)H(23)Cl(2)NO, was synthesised from β-himachalene (3,5,5,9-tetra-methyl-2,4a,5,6,7,8-hexa-hydro-1H-benzocyclo-heptene), which was isolated from the essential oil of the Atlas cedar (Cedrus Atlantica). The mol-ecule contains a seven membered ring, which is fused to a five- and a three-membered ring. The five-membered ring has a twisted conformation, whereas the seven-membered ring displays a chair conformation. The dihedral angle between the five- and seven-membered rings is 45.26 (9)°. The absolute structure was established unambiguously from anomalous dispersion effects. In the crystal, mol-ecules are linked into chains propagating along the b axis by inter-molecular N-H⋯O hydrogen bonds; an intramolecular N-H⋯O link also occurs.
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Affiliation(s)
- Ahmed Benharref
- Laboratoire de Chimie Biomoléculaires, Substances Naturelles et Réactivité, URAC16, Faculté des Sciences, Semlalia, BP 2390 Bd My Abdellah, 40000 Marrakech, Morocco
| | - Essêdiya Lassaba
- Laboratoire de Chimie Biomoléculaires, Substances Naturelles et Réactivité, URAC16, Faculté des Sciences, Semlalia, BP 2390 Bd My Abdellah, 40000 Marrakech, Morocco
| | - Daniel Avignant
- Université Blaise Pascal, Laboratoire des Matériaux Inorganiques, UMR CNRS 6002, 24 Avenue des Landais, 63177 Aubière, France
| | - Abdelghani Oudahmane
- Université Blaise Pascal, Laboratoire des Matériaux Inorganiques, UMR CNRS 6002, 24 Avenue des Landais, 63177 Aubière, France
| | - Moha Berraho
- Laboratoire de Chimie Biomoléculaires, Substances Naturelles et Réactivité, URAC16, Faculté des Sciences, Semlalia, BP 2390 Bd My Abdellah, 40000 Marrakech, Morocco
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Benharref A, El Ammari L, Avignant D, Oudahmane A, Berraho M. (1S,3R,8S,9R,10S)-2,2-Dichloro-3,7,7,10-tetra-methyl-9,10-ep-oxy-tricyclo-[6.4.0.0]dodeca-ne. Acta Crystallogr Sect E Struct Rep Online 2010; 66:o3125. [PMID: 21589429 PMCID: PMC3011603 DOI: 10.1107/s1600536810045344] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2010] [Accepted: 11/04/2010] [Indexed: 11/16/2022]
Abstract
The title compound, C16H24Cl2O, was synthesized from β-himachalene (3,5,5,9-tetramethyl-2,4a,5,6,7,8-hexahydro-1H-benzocycloheptene), which was isolated from the essential oil of the Atlas cedar (cedrus atlantica). The molecule forms an extended sheet of two fused rings which exhibit different conformations. The six-membered ring has a half-chair conformation, while the seven-membered ring displays a chair conformation; the dihedral angle between the two rings is 38.2 (1)°.
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Benharref A, El Ammari L, Berraho M. (1S,2R,8R)-2,2-Dichloro-3,7,7,10-tetra-methyltricyclo-[6.4.0.0]dodec-10-en-9-one. Acta Crystallogr Sect E Struct Rep Online 2010; 66:o2911. [PMID: 21589085 PMCID: PMC3009205 DOI: 10.1107/s1600536810040213] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2010] [Accepted: 10/07/2010] [Indexed: 05/26/2023]
Abstract
The title compound, C16H22Cl2O, was synthesized from β-himachalene, which was isolated from essential oil of the Atlas cedar (cedrus atlantica). The asymmetric unit contains two independent molecules, in each of which the six-membered ring shows a half-chair conformation, whereas the seven-membered ring displays a boat conformation. The dihedral angle between the two rings is slightly different in the two molecules [63.22 (13) and 61.81 (14)°].
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Benharref A, El Ammari L, Berraho M, Lassaba E. (1S,2S,4R)-3,3-Dichloro-4,8,12,12-tetra-methyl-tricyclo-[5.5.0.0]dodeca-6,8-diene. Acta Crystallogr Sect E Struct Rep Online 2010; 66:o2463. [PMID: 21588782 PMCID: PMC3007900 DOI: 10.1107/s1600536810034070] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2010] [Accepted: 08/24/2010] [Indexed: 11/10/2022]
Abstract
The title compound, C(16)H(22)Cl(2), a derivative of β-himachalene, was semi-synthesized from natural essential oils of Cedrus atlantica. The mol-ecule is built up from two fused six- and seven-membered rings. The six-membered ring has a perfect chair conformation, whereas the seven-membered ring displays a screw boat conformation; the dihedral angle between the rings is 46.48 (9)°.
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Haib AE, Benharref A, Parrès-Maynadié S, Manoury E, Daran JC, Urrutigoïty M, Gouygou M. Molecular rearrangement of epoxide derived from sesquiterpenes by Lewis acid catalysis. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.tetasy.2010.04.024] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Orendt AM, Roberts SW, Rainier JD. The Role of Asynchronous Bond Formation in the Diastereoselective Epoxidation of Cyclic Enol Ethers: A Density Functional Theory Study. J Org Chem 2006; 71:5565-73. [PMID: 16839135 DOI: 10.1021/jo060502g] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Density functional theory (DFT) (Becke3LYP functional and the D95 basis set) was used to study the influence of substitution on the dimethyldioxirane epoxidation reaction of six- and seven-membered cyclic enol ethers. In agreement with our previously reported experimental results, the calculations predict that substitution on the cyclic enol ether influences the level of diastereoselectivity. Apparent only from the calculations is that the degree of synchronicity in the transition state is important in the diastereoselectivity.
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Affiliation(s)
- Anita M Orendt
- Department of Chemistry, 315 South 1400 East, University of Utah, Salt Lake City, Utah 84112-0850, USA.
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Eljamili H, Auhmani A, Dakir M, Lassaba E, Benharref A, Pierrot M, Chiaroni A, Riche C. Oxydation et addition des dihalocarbènes sur le β-himachalène. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)01407-7] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Computational study of chemo- and stereoselectivity of α-cis, α-trans and α′-trans-himachalene epoxidation by MCPBA. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s0166-1280(02)00136-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Deubel DV. Are Peroxyformic Acid and Dioxirane Electrophilic or Nucleophilic Oxidants?,. J Org Chem 2001; 66:3790-6. [PMID: 11374999 DOI: 10.1021/jo010127m] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The electronic character of peroxyformic acid and dioxirane has been clarified by the analysis of donor-acceptor interactions in 16 transition states (TS) for the epoxidation of olefins. Is has been shown that the olefins are attacked by peroxyformic acid (PFA) in an electrophilic way. A relation of the electronic character to reactivity has been found: the more electrophilic the attack on the C=C bond is, the faster the reaction. In contrast, dioxirane (DO) has been identified as both an electrophilic and nucleophilic oxidant, depending on the substituents at the C=C double bond. The substrates with electron-withdrawing groups are attacked by DO in a nucleophilic way. These reactions have comparably low activation barriers. For instance, the acrylonitrile epoxidation with dioxirane is significantly faster than the corresponding reaction with PFA and proceeds via a transition state with a smaller extent of reaction and a larger extent of asymmetry.
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Affiliation(s)
- D V Deubel
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta, Canada T2N 1N4.
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Deubel DV. Ethylene Epoxidation with Tungsten Diperoxo Complexes: Is Relativity the Origin of Reactivity? J Phys Chem A 2001. [DOI: 10.1021/jp0100497] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dirk V. Deubel
- Department of Chemistry, University of Calgary, Calgary, Alberta, Canada T2N 1N4
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