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Kazakova O, Racoviceanu R, Petrova A, Mioc M, Militaru A, Udrescu L, Udrescu M, Voicu A, Cummings J, Robertson G, Ordway DJ, Slayden RA, Șoica C. New Investigations with Lupane Type A-Ring Azepane Triterpenoids for Antimycobacterial Drug Candidate Design. Int J Mol Sci 2021; 22:12542. [PMID: 34830423 PMCID: PMC8621456 DOI: 10.3390/ijms222212542] [Citation(s) in RCA: 2] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 11/16/2021] [Accepted: 11/17/2021] [Indexed: 12/02/2022] Open
Abstract
Twenty lupane type A-ring azepano-triterpenoids were synthesized from betulin and its related derivatives and their antitubercular activity against Mycobacterium tuberculosis, mono-resistant MTB strains, and nontuberculous strains Mycobacterium abscessus and Mycobacterium avium were investigated in the framework of AToMIc (Anti-mycobacterial Target or Mechanism Identification Contract) realized by the Division of Microbiology and Infectious Diseases, NIAID, National Institute of Health. Of all the tested triterpenoids, 17 compounds showed antitubercular activity and 6 compounds were highly active on the H37Rv wild strain (with MIC 0.5 µM for compound 7), out of which 4 derivatives also emerged as highly active compounds on the three mono-resistant MTB strains. Molecular docking corroborated with a machine learning drug-drug similarity algorithm revealed that azepano-triterpenoids have a rifampicin-like antitubercular activity, with compound 7 scoring the highest as a potential M. tuberculosis RNAP potential inhibitor. FIC testing demonstrated an additive effect of compound 7 when combined with rifampin, isoniazid and ethambutol. Most compounds were highly active against M. avium with compound 14 recording the same MIC value as the control rifampicin (0.0625 µM). The antitubercular ex vivo effectiveness of the tested compounds on THP-1 infected macrophages is correlated with their increased cell permeability. The tested triterpenoids also exhibit low cytotoxicity and do not induce antibacterial resistance in MTB strains.
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Affiliation(s)
- Oxana Kazakova
- Ufa Institute of Chemistry, The Ufa Federal Research Centre, The Russian Academy of Sciences, 71, Pr. Oktyabrya, 450054 Ufa, Russia;
| | - Roxana Racoviceanu
- Department II-Pharmaceutical Chemistry, Faculty of Pharmacy, “Victor Babeş” University of Medicine and Pharmacy Timişoara, 2 Eftimie Murgu Sq., 300041 Timişoara, Romania; (R.R.); (M.M.); (C.Ș.)
- Res Ctr Pharmacotoxicol Evaluat, Faculty of Pharmacy, “Victor Babeş” University of Medicine and Pharmacy Timisoara, Eftimie Murgu Sq. 2, 300041 Timisoara, Romania
| | - Anastasiya Petrova
- Ufa Institute of Chemistry, The Ufa Federal Research Centre, The Russian Academy of Sciences, 71, Pr. Oktyabrya, 450054 Ufa, Russia;
| | - Marius Mioc
- Department II-Pharmaceutical Chemistry, Faculty of Pharmacy, “Victor Babeş” University of Medicine and Pharmacy Timişoara, 2 Eftimie Murgu Sq., 300041 Timişoara, Romania; (R.R.); (M.M.); (C.Ș.)
- Res Ctr Pharmacotoxicol Evaluat, Faculty of Pharmacy, “Victor Babeş” University of Medicine and Pharmacy Timisoara, Eftimie Murgu Sq. 2, 300041 Timisoara, Romania
| | - Adrian Militaru
- Department of Computer and Information Technology, University Politehnica of Timişoara, 2 Vasile Pârvan Blvd., 300223 Timişoara, Romania; (A.M.); (M.U.)
| | - Lucreția Udrescu
- Department I-Drug Analysis, Faculty of Pharmacy, “Victor Babeş” University of Medicine and Pharmacy Timişoara, 2 Eftimie Murgu Sq., 300041 Timişoara, Romania;
| | - Mihai Udrescu
- Department of Computer and Information Technology, University Politehnica of Timişoara, 2 Vasile Pârvan Blvd., 300223 Timişoara, Romania; (A.M.); (M.U.)
| | - Adrian Voicu
- Department III-Informatics and Medical Biostatistics, Faculty of Pharmacy, “Victor Babeş” University of Medicine and Pharmacy Timişoara, 2 Eftimie Murgu Sq., 300041 Timişoara, Romania
| | - Jason Cummings
- Department of Microbiology, Immunology & Pathology, Colorado State University, 1619 Campus Delivery, Fort Collins, CO 80523, USA; (J.C.); (G.R.); (D.J.O.); (R.A.S.)
| | - Gregory Robertson
- Department of Microbiology, Immunology & Pathology, Colorado State University, 1619 Campus Delivery, Fort Collins, CO 80523, USA; (J.C.); (G.R.); (D.J.O.); (R.A.S.)
| | - Diane J. Ordway
- Department of Microbiology, Immunology & Pathology, Colorado State University, 1619 Campus Delivery, Fort Collins, CO 80523, USA; (J.C.); (G.R.); (D.J.O.); (R.A.S.)
| | - Richard A. Slayden
- Department of Microbiology, Immunology & Pathology, Colorado State University, 1619 Campus Delivery, Fort Collins, CO 80523, USA; (J.C.); (G.R.); (D.J.O.); (R.A.S.)
| | - Codruța Șoica
- Department II-Pharmaceutical Chemistry, Faculty of Pharmacy, “Victor Babeş” University of Medicine and Pharmacy Timişoara, 2 Eftimie Murgu Sq., 300041 Timişoara, Romania; (R.R.); (M.M.); (C.Ș.)
- Res Ctr Pharmacotoxicol Evaluat, Faculty of Pharmacy, “Victor Babeş” University of Medicine and Pharmacy Timisoara, Eftimie Murgu Sq. 2, 300041 Timisoara, Romania
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Khoroshunova YV, Morozov DA, Taratayko AI, Dobrynin SA, Eltsov IV, Rybalova TV, Sotnikova YS, Polovyanenko DN, Asanbaeva NB, Kirilyuk IA. The Reactions of 6-(Hydroxymethyl)-2,2-dimethyl-1-azaspiro[4.4]nonanes with Methanesulfonyl Chloride or PPh 3-CBr 4. Molecules 2021; 26:molecules26196000. [PMID: 34641544 PMCID: PMC8512565 DOI: 10.3390/molecules26196000] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 09/24/2021] [Accepted: 09/29/2021] [Indexed: 11/29/2022] Open
Abstract
Activation of a hydroxyl group towards nucleophilic substitution via reaction with methanesulfonyl chloride or PPh3-CBr4 system is a commonly used pathway to various functional derivatives. The reactions of (5R(S),6R(S))-1-X-6-(hydroxymethyl)-2,2-dimethyl- 1-azaspiro[4.4]nonanes 1a–d (X = O·; H; OBn, OBz) with MsCl/NR3 or PPh3-CBr4 were studied. Depending on substituent X, the reaction afforded hexahydro-1H,6H-cyclopenta[c]pyrrolo[1,2-b]isoxazole (2) (for X = O), a mixture of 2 and octahydrocyclopenta[c]azepines (4–6) (for X = OBn, OBz), or perhydro-cyclopenta[2,3]azeto[1,2-a]pyrrol (3) (for X = H) derivatives. Alkylation of the latter with MeI with subsequent Hofmann elimination afforded 2,3,3-trimethyl-1,2,3,4,5,7,8,8a-octahydrocyclopenta[c]azepine with 56% yield.
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Affiliation(s)
- Yulia V. Khoroshunova
- N.N. Vorozhtsov Institute of Organic Chemistry SB RAS, Academician Lavrentiev Ave. 9, 630090 Novosibirsk, Russia; (D.A.M.); (A.I.T.); (S.A.D.); (T.V.R.); (Y.S.S.); (D.N.P.); (N.B.A.); (I.A.K.)
- Department of Natural Sciences, Novosibirsk State University, Pirogova Str. 1, 630090 Novosibirsk, Russia;
- Correspondence:
| | - Denis A. Morozov
- N.N. Vorozhtsov Institute of Organic Chemistry SB RAS, Academician Lavrentiev Ave. 9, 630090 Novosibirsk, Russia; (D.A.M.); (A.I.T.); (S.A.D.); (T.V.R.); (Y.S.S.); (D.N.P.); (N.B.A.); (I.A.K.)
| | - Andrey I. Taratayko
- N.N. Vorozhtsov Institute of Organic Chemistry SB RAS, Academician Lavrentiev Ave. 9, 630090 Novosibirsk, Russia; (D.A.M.); (A.I.T.); (S.A.D.); (T.V.R.); (Y.S.S.); (D.N.P.); (N.B.A.); (I.A.K.)
- Department of Natural Sciences, Novosibirsk State University, Pirogova Str. 1, 630090 Novosibirsk, Russia;
| | - Sergey A. Dobrynin
- N.N. Vorozhtsov Institute of Organic Chemistry SB RAS, Academician Lavrentiev Ave. 9, 630090 Novosibirsk, Russia; (D.A.M.); (A.I.T.); (S.A.D.); (T.V.R.); (Y.S.S.); (D.N.P.); (N.B.A.); (I.A.K.)
| | - Ilia V. Eltsov
- Department of Natural Sciences, Novosibirsk State University, Pirogova Str. 1, 630090 Novosibirsk, Russia;
| | - Tatyana V. Rybalova
- N.N. Vorozhtsov Institute of Organic Chemistry SB RAS, Academician Lavrentiev Ave. 9, 630090 Novosibirsk, Russia; (D.A.M.); (A.I.T.); (S.A.D.); (T.V.R.); (Y.S.S.); (D.N.P.); (N.B.A.); (I.A.K.)
| | - Yulia S. Sotnikova
- N.N. Vorozhtsov Institute of Organic Chemistry SB RAS, Academician Lavrentiev Ave. 9, 630090 Novosibirsk, Russia; (D.A.M.); (A.I.T.); (S.A.D.); (T.V.R.); (Y.S.S.); (D.N.P.); (N.B.A.); (I.A.K.)
| | - Dmitriy N. Polovyanenko
- N.N. Vorozhtsov Institute of Organic Chemistry SB RAS, Academician Lavrentiev Ave. 9, 630090 Novosibirsk, Russia; (D.A.M.); (A.I.T.); (S.A.D.); (T.V.R.); (Y.S.S.); (D.N.P.); (N.B.A.); (I.A.K.)
| | - Nargiz B. Asanbaeva
- N.N. Vorozhtsov Institute of Organic Chemistry SB RAS, Academician Lavrentiev Ave. 9, 630090 Novosibirsk, Russia; (D.A.M.); (A.I.T.); (S.A.D.); (T.V.R.); (Y.S.S.); (D.N.P.); (N.B.A.); (I.A.K.)
- Department of Natural Sciences, Novosibirsk State University, Pirogova Str. 1, 630090 Novosibirsk, Russia;
| | - Igor A. Kirilyuk
- N.N. Vorozhtsov Institute of Organic Chemistry SB RAS, Academician Lavrentiev Ave. 9, 630090 Novosibirsk, Russia; (D.A.M.); (A.I.T.); (S.A.D.); (T.V.R.); (Y.S.S.); (D.N.P.); (N.B.A.); (I.A.K.)
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Kazakova OB, Medvedeva NI, Smirnova IE, Lopatina TV, Veselovsky AV. The Introduction of Hydrazone, Hydrazide, or Azepane Moieties to the Triterpenoid Core Enhances an Activity Against M. tuberculosis. Med Chem 2021; 17:134-145. [PMID: 31939731 DOI: 10.2174/1573406416666200115161700] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Revised: 07/18/2019] [Accepted: 10/14/2019] [Indexed: 11/22/2022]
Abstract
BACKGROUND Triterpenoids exhibit a wide spectrum of antimicrobial activity. OBJECTIVE The objective of this study was to synthesize a series of nitrogen derivatives based on lupane, oleanane, and ursane triterpenoids with high antitubercular activity. METHODS Isonicotinoylhydrazones were prepared via the reaction of 3-oxotriterpenic acids or betulonic aldehyde with isoniazid (INH) in yields of 54-72%. N-Acylation of betulonic or azepanobetulinic acids led to lupane C28 hydrazides and dihydrazides. The derivatives were evaluated for their in vitro antimycobacterial activities against Mycobacterium tuberculosis (MTB) H37RV and single-drug resistance (SDR)-TB in the National Institute of Allergy and Infectious Diseases, USA. Molecular docking was performed to evaluate the possible binding modes of investigated compounds in the active site of Diterpene synthase (Rv3378c). RESULTS The obtained compounds are represented by C3 or C28 conjugates with hydrazine hydrate or INH. Some compounds demonstrated from high minimum inhibitory concentration (MIC ≤ 10 μg/mL) to excellent (MICs from 0.19 to 1.25 μg/mL) activity against MTB H37RV. Two lupane conjugates with INH were the leading compounds against MTB H37RV and some SDR-strains with MICs ranged from 0.19 to 1.70 μg/mL. Molecular docking of active compounds to diterpene synthase showed that these moieties accommodate the active site of the enzyme. CONCLUSION It was revealed that the conjugation of lupanes with INH at C3 is more effective than at C28 and the lupane skeleton is preferable among oleanane and ursane types. The replacement of native hexacarbocyclic A ring to seven-member azepane ring is favorably for inhibition of both MTB H37RV and SDR-strains. These data could possibly mean that the antitubercular activity against INH-resistant strains (INH-R) came from both triterpenoid and isoniazid parts of the hybrid molecules. Azepanobetulin showed the highest activity against both INH-R strains in comparison with other triterpenoids and INH. Thus, the introduction of hydrazone, hydrazide (dihydrazide), or azepane moieties into the triterpenoid core is a promising way for the development of new anti-tubercular agents.
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Affiliation(s)
- Oxana B Kazakova
- Ufa Institute of Chemistry of the Ufa Federal Research Centre of the Russian Academy of Sciences, 71 Prospekt Oktyabrya, 450054, Ufa, Russian Federation
| | - Natalya I Medvedeva
- Ufa Institute of Chemistry of the Ufa Federal Research Centre of the Russian Academy of Sciences, 71 Prospekt Oktyabrya, 450054, Ufa, Russian Federation
| | - Irina E Smirnova
- Ufa Institute of Chemistry of the Ufa Federal Research Centre of the Russian Academy of Sciences, 71 Prospekt Oktyabrya, 450054, Ufa, Russian Federation
| | - Tatyana V Lopatina
- Ufa Institute of Chemistry of the Ufa Federal Research Centre of the Russian Academy of Sciences, 71 Prospekt Oktyabrya, 450054, Ufa, Russian Federation
| | - Alexander V Veselovsky
- Institute of Biomedical Chemistry, 10 Pogodinskaya str., 119121, Moscow, Russian Federation
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Kazakova O, Smirnova I, Tret’yakova E, Csuk R, Hoenke S, Fischer L. Cytotoxic Potential of a-Azepano- and 3-Amino-3,4-SeCo-Triterpenoids. Int J Mol Sci 2021; 22:ijms22041714. [PMID: 33567783 PMCID: PMC7914897 DOI: 10.3390/ijms22041714] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Accepted: 02/03/2021] [Indexed: 12/14/2022] Open
Abstract
Semi-synthetic triterpenoids, holding an amino substituted seven-membered A-ring (azepano-ring), which could be synthesized from triterpenic oximes through a Beckmann type rearrangement followed by a reduction of lactame fragment, are considered to be novel promising agents exhibiting anti-microbial, alpha-glucosidase, and butyrylcholinesterase inhibitory activities. In this study, in an attempt to develop new antitumor candidates, a series of A-ring azepano- and 3-amino-3,4-seco-derivatives of betulin, oleanolic, ursolic, and glycyrrhetinic acids were evaluated for their cytotoxic activity against five human cancer cell lines and non-malignant mouse fibroblasts by means of a colorimetric sulforhodamine assay. Azepanoallobetulinic acid amide derivative 11 was the most cytotoxic compound of this series but showed little selectivity between the different human tumor cell lines. Flow cytometry experiments showed compound 11 to act mainly by apoptosis (44.3%) and late apoptosis (21.4%). The compounds were further screened at the National Cancer Institute towards a panel of 60 cancer cell lines. It was found that compounds 3, 4, 7, 8, 9, 11, 15, 16, 19, and 20 showed growth inhibitory (GI50) against the most sensitive cell lines at submicromolar concentrations (0.20–0.94 μM), and their cytotoxic activity (LC50) was also high (1–6 μM). Derivatives 3, 8, 11, 15, and 16 demonstrated a certain selectivity profile at GI50 level from 5.16 to 9.56 towards K-562, CCRF-CEM, HL-60(TB), and RPMI-8226 (Leukemia), HT29 (Colon cancer), and OVCAR-4 (Ovarian cancer) cell lines. Selectivity indexes of azepanoerythrodiol 3 at TGI level ranged from 5.93 (CNS cancer cell lines SF-539, SNB-19 and SNB-75) to 14.89 for HCT-116 (colon cancer) with SI 9.56 at GI50 level for the leukemia cell line K-562. The present study highlighted the importance of A-azepano-ring in the triterpenic core for the development of novel antitumor agents, and a future aim to increase the selectivity profile will thus lie in the area of modifications of azepano-triterpenic acids at their carboxyl group.
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Affiliation(s)
- Oxana Kazakova
- Ufa Institute of Chemistry of the Ufa Federal Research Centre of the Russian Academy of Sciences, 71, pr. Oktyabrya, 450054 Ufa, Russia; (I.S.); (E.T.)
- Correspondence: (O.K.); (R.C.); Tel.: +7-347-235-6066 (O.K.); +49-345-5525-660 (R.C.)
| | - Irina Smirnova
- Ufa Institute of Chemistry of the Ufa Federal Research Centre of the Russian Academy of Sciences, 71, pr. Oktyabrya, 450054 Ufa, Russia; (I.S.); (E.T.)
| | - Elena Tret’yakova
- Ufa Institute of Chemistry of the Ufa Federal Research Centre of the Russian Academy of Sciences, 71, pr. Oktyabrya, 450054 Ufa, Russia; (I.S.); (E.T.)
| | - René Csuk
- Organic Chemistry, Martin-Luther-University Halle-Wittenberg, Kurt-Mothes-Str. 2, D-06120 Halle (Saale), Germany; (S.H.); (L.F.)
- Correspondence: (O.K.); (R.C.); Tel.: +7-347-235-6066 (O.K.); +49-345-5525-660 (R.C.)
| | - Sophie Hoenke
- Organic Chemistry, Martin-Luther-University Halle-Wittenberg, Kurt-Mothes-Str. 2, D-06120 Halle (Saale), Germany; (S.H.); (L.F.)
| | - Lucie Fischer
- Organic Chemistry, Martin-Luther-University Halle-Wittenberg, Kurt-Mothes-Str. 2, D-06120 Halle (Saale), Germany; (S.H.); (L.F.)
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Thullen SM, Rubush DM, Rovis T. A Photochemical Two-Step Formal [5+2] Cycloaddition: A Condensation/Ring-Expansion Approach to Substituted Azepanes. Synlett 2018; 28:2755-2758. [PMID: 29861552 DOI: 10.1055/s-0036-1589049] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [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: 10/19/2022]
Abstract
Seven-membered nitrogen-containing heterocycles are considerably underrepresented in the literature compared to their five- and six-membered analogues. Herein, we report a relatively understudied photochemical rearrangement of N-vinylpyrrolidinones to azepin-4-ones in good yields. This transformation allows for the conversion of readily available pyrrolidinones and aldehydes to densely functionalized azepane derivatives in a facile two step procedure.
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Affiliation(s)
- Scott M Thullen
- Department of Chemistry, Columbia University, New York, NY 10027.,Department of Chemistry, Colorado State University, Fort Collins, CO 80523
| | - David M Rubush
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523
| | - Tomislav Rovis
- Department of Chemistry, Columbia University, New York, NY 10027.,Department of Chemistry, Colorado State University, Fort Collins, CO 80523
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Oishi T, Yoritate M, Sato T, Chida N. Crystal structure of (-)-(5 R,7 R,8 S,9 R,10 S)-8-methyl-7-[(5 R)-3-methyl-2-oxooxolan-3-en-5-yl]-1-aza-6-oxatri-cyclo-[8.3.0.0 5,9]tridecan-13-one monohydrate. Acta Crystallogr E Crystallogr Commun 2018; 74:555-558. [PMID: 29765766 PMCID: PMC5946988 DOI: 10.1107/s2056989018004425] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Accepted: 03/16/2018] [Indexed: 11/10/2022]
Abstract
The title compound, C17H23NO4·H2O, is an epimer of the natural tetra-cyclic alkaloid isosaxorumamide which consists of a fused 5-7-5 tricyclic core and a di-hydro-furan-one substituent. The terminal di-hydro-furan ring is essentially planar with a maximum deviation of 0.0273 (14) Å from the mean plane and oxolane, azepane and pyrrolidine rings in the tricyclic ring system adopt twist, twist-chair and envelope forms, respectively. In the crystal, the amide and water mol-ecules are linked by O-H⋯O hydrogen bonds, forming a tape structure running along the b-axis direction. The tapes are further connected by C-H⋯O inter-actions into a three-dimensional architecture.
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Affiliation(s)
- Takeshi Oishi
- School of Medicine, Keio University, Hiyoshi 4-1-1, Kohoku-ku, Yokohama 223-8521, Japan
| | - Makoto Yoritate
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, Hiyoshi 3-14-1, Kohoku-ku, Yokohama 223-8522, Japan
| | - Takaaki Sato
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, Hiyoshi 3-14-1, Kohoku-ku, Yokohama 223-8522, Japan
| | - Noritaka Chida
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, Hiyoshi 3-14-1, Kohoku-ku, Yokohama 223-8522, Japan
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Toze FAA, Poplevin DS, Zubkov FI, Nikitina EV, Porras C, Khrustalev VN. Crystal structure of methyl (3RS,4SR,4aRS,11aRS,11bSR)-5-oxo-3,4,4a,5,7,8,9,10,11,11a-deca-hydro-3,11b-ep-oxy-azepino[2,1-a]iso-indole-4-carboxyl-ate. Acta Crystallogr E Crystallogr Commun 2015; 71:o729-30. [PMID: 26594446 PMCID: PMC4647423 DOI: 10.1107/s2056989015016679] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Accepted: 09/07/2015] [Indexed: 11/10/2022]
Abstract
The title compound, C15H19NO4, is the a product of the esterification of the corresponding carbonic acid with methanol. The molecule comprises a fused tetracyclic system containing three five-membered rings (2-pyrrolidinone, tetrahydrofuran and dihydrofuran) and one seven-membered ring (azepane). The five-membered rings have the usual envelope conformations, with the quaternary C atom being the flap atom for the 2-pyrrolidinone ring, and the ether O atom being the common flap atom for the remaining rings. The seven-membered azepane ring adopts a chair conformation with the methine and middle methylene C atoms lying above and below the mean plane defined by the remaining five atoms. The carboxylate substituent is rotated by 77.56 (5)° with respect to the base plane of the tetrahydrofuran ring. In the crystal, the molecules are bound by weak C—H⋯O hydrogen-bonding interactions into puckered layers parallel to (001).
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Affiliation(s)
- Flavien A A Toze
- Department of Chemistry, University of Douala, Faculty of Sciences, PO Box 24157, Douala, Republic of Cameroon
| | - Dmitry S Poplevin
- Department of Organic Chemistry, Peoples' Friendship University of Russia, 6 Miklukho-Maklay St, Moscow 117198, Russian Federation
| | - Fedor I Zubkov
- Department of Organic Chemistry, Peoples' Friendship University of Russia, 6 Miklukho-Maklay St, Moscow 117198, Russian Federation
| | - Eugeniya V Nikitina
- Department of Organic Chemistry, Peoples' Friendship University of Russia, 6 Miklukho-Maklay St, Moscow 117198, Russian Federation
| | - Ciara Porras
- Department of Chemistry & Biology, New Mexico Highlands University, 803 University Ave, Las Vegas, NM 87701, USA
| | - Victor N Khrustalev
- Department of Chemistry & Biology, New Mexico Highlands University, 803 University Ave, Las Vegas, NM 87701, USA ; Department of Inorganic Chemistry, Peoples' Friendship University of Russia, 6 Miklukho-Maklay St, Moscow 117198, Russian Federation
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Saha T, Maitra R, Chattopadhyay SK. A unified approach to the important protein kinase inhibitor balanol and a proposed analogue. Beilstein J Org Chem 2013; 9:2910-5. [PMID: 24454570 PMCID: PMC3896276 DOI: 10.3762/bjoc.9.327] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [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: 08/06/2013] [Accepted: 11/07/2013] [Indexed: 11/26/2022] Open
Abstract
A common approach to the important protein kinase inhibitor (−)-balanol and an azepine-ring-modified balanol derivative has been developed using an efficient fragment coupling protocol which proceeded in good overall yield.
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Affiliation(s)
- Tapan Saha
- Department of Chemistry, University of Kalyani, Kalyani - 741235, West Bengal, India
| | - Ratnava Maitra
- Department of Chemistry, University of Kalyani, Kalyani - 741235, West Bengal, India
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