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Matsumoto K, Yanagi R, Yamaguchi K, Hayashi E, Yasuda E, Nokami T, Nishiwaki K, Kashimura S, Kuriyama K. Lewis Acid Promoted Prins Cyclization Using Non-Conjugated Diene Alcohol: Sequential Reactions Terminated by Fluoride Ion. HETEROCYCLES 2018. [DOI: 10.3987/com-18-13940] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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2
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Nishida Y, Ueda M, Hayashi M, Takeda N, Miyata O. Dimethylzinc-Mediated Chlorolactamization of Homoallylic Amines with Chloroform. European J Org Chem 2015. [DOI: 10.1002/ejoc.201501241] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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3
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Huber J, Wölfling J, Schneider G, Ocsovszki I, Varga M, Zupkó I, Mernyák E. Synthesis of antiproliferative 13α-d-homoestrones via Lewis acid-promoted one-pot Prins-Ritter reactions of d-secosteroidal δ-alkenyl-aldehydes. Steroids 2015. [PMID: 26210211 DOI: 10.1016/j.steroids.2015.07.004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A simple one-pot Prins-Ritter route was developed for the synthesis of 16-acylamino-17a-hydroxy-d-homoestrone 3-benzyl and 3-methyl ethers in the 13α-estrone series. The d-secosteroidal δ-alkenyl-aldehydes were allowed to react with different nitriles in the presence of BF3·OEt2 as a Lewis acid catalyst. Prins cyclizations afforded 17a-hydroxy-16-carbenium ions, which underwent Ritter reactions with nitriles, leading to 16α- or 16β-acylamino derivatives. A side-product in which a dihydro-1,3-oxazine was bridged to six-membered ring D at positions 16α,17aα was formed in each reaction. The antiproliferative properties of the novel 13α-d-homosteroids were determined on a panel of human adherent cancer cell lines (HeLa, MCF-7, T47D, MDA-MB-231, MDA-MB-361, A2780 and A431) by means of MTT (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide) assays. Some compounds proved to be more effective (with submicromolar IC50 values) than the reference agent cisplatin. One of the most potent compounds substantially increased the rate of tubulin polymerization. Cell cycle analyses by flow cytometry indicated a concentration-dependent accumulation of the G2/M cell population.
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Affiliation(s)
- Judit Huber
- Department of Organic Chemistry, University of Szeged, Dóm tér 8., H-6720 Szeged, Hungary
| | - János Wölfling
- Department of Organic Chemistry, University of Szeged, Dóm tér 8., H-6720 Szeged, Hungary
| | - Gyula Schneider
- Department of Organic Chemistry, University of Szeged, Dóm tér 8., H-6720 Szeged, Hungary
| | - Imre Ocsovszki
- Department of Biochemistry, University of Szeged, Dóm tér 9., H-6720 Szeged, Hungary
| | - Mónika Varga
- Cereal Research Non-Profit Ltd., P.O. Box 391, H-6701 Szeged, Hungary
| | - István Zupkó
- Department of Pharmacodynamics and Biopharmacy, University of Szeged, Eötvös u. 6., H-6720 Szeged, Hungary.
| | - Erzsébet Mernyák
- Department of Organic Chemistry, University of Szeged, Dóm tér 8., H-6720 Szeged, Hungary.
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4
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Cresswell AJ, Davies SG, Roberts PM, Thomson JE. Beyond the Balz-Schiemann reaction: the utility of tetrafluoroborates and boron trifluoride as nucleophilic fluoride sources. Chem Rev 2014; 115:566-611. [PMID: 25084541 DOI: 10.1021/cr5001805] [Citation(s) in RCA: 126] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Alexander J Cresswell
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford , Mansfield Road, Oxford OX1 3TA, United Kingdom
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5
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Cui J, Jia Q, Feng RZ, Liu SS, He T, Zhang C. Boron Trifluoride Etherate Functioning as a Fluorine Source in an Iodosobenzene-Mediated Intramolecular Aminofluorination of Homoallylic Amines. Org Lett 2014; 16:1442-5. [DOI: 10.1021/ol500238k] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Jian Cui
- State Key Laboratory of Elemento-Organic
Chemistry, Collaborative Innovation Center of Chemical Science and
Engineering (Tianjin), The Research Institute of Elemento-Organic
Chemistry, Nankai University, Tianjin 300071, P. R. of China
| | - Qun Jia
- State Key Laboratory of Elemento-Organic
Chemistry, Collaborative Innovation Center of Chemical Science and
Engineering (Tianjin), The Research Institute of Elemento-Organic
Chemistry, Nankai University, Tianjin 300071, P. R. of China
| | - Ruo-Zhu Feng
- State Key Laboratory of Elemento-Organic
Chemistry, Collaborative Innovation Center of Chemical Science and
Engineering (Tianjin), The Research Institute of Elemento-Organic
Chemistry, Nankai University, Tianjin 300071, P. R. of China
| | - Shan-Shan Liu
- State Key Laboratory of Elemento-Organic
Chemistry, Collaborative Innovation Center of Chemical Science and
Engineering (Tianjin), The Research Institute of Elemento-Organic
Chemistry, Nankai University, Tianjin 300071, P. R. of China
| | - Tian He
- State Key Laboratory of Elemento-Organic
Chemistry, Collaborative Innovation Center of Chemical Science and
Engineering (Tianjin), The Research Institute of Elemento-Organic
Chemistry, Nankai University, Tianjin 300071, P. R. of China
| | - Chi Zhang
- State Key Laboratory of Elemento-Organic
Chemistry, Collaborative Innovation Center of Chemical Science and
Engineering (Tianjin), The Research Institute of Elemento-Organic
Chemistry, Nankai University, Tianjin 300071, P. R. of China
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6
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Saloranta T, Zupkó I, Rahkila J, Schneider G, Wölfling J, Leino R. Increasing the amphiphilicity of an estradiol based steroid structure by Barbier-allylation--ring-closing metathesis--dihydroxylation sequence. Steroids 2012; 77:110-7. [PMID: 22085429 DOI: 10.1016/j.steroids.2011.10.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2011] [Revised: 10/24/2011] [Accepted: 10/25/2011] [Indexed: 11/20/2022]
Abstract
Polyhydroxylated steroids, such as brassinosteroids, phytoecdysteroids and steroid saponins, are structurally attractive compounds possessing a number of interesting biological properties. Accordingly, development of synthetic procedures to build steroid based structures mimicking the naturally occurring hydrophilic steroids is of topical interest. In the present work, a D-secoestrone derivative was modified further by Barbier-allylation - ring-closing metathesis - dihydroxylation sequence with the aim to prepare steroid based structures with limited hydrophilicity. A straightforward synthesis route was developed with the isolated yield for each step ranging from good to excellent. All compounds prepared were fully characterized by NMR spectroscopic techniques and completely assigned (1)H and (13)C spectra are reported herein. Finally, the effects of the synthesized amphiphilic steroid derivatives on the proliferation of cancer cells are reported and discussed.
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Affiliation(s)
- Tiina Saloranta
- Laboratory of Organic Chemistry, Åbo Akademi University, Åbo, Finland
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7
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Takács A, Acs P, Berente Z, Wölfling J, Schneider G, Kollár L. Novel 13β- and 13α-D-homo steroids: 17a-carboxamido-D-homoestra-1,3,5(10),17-tetraene derivatives via palladium-catalyzed aminocarbonylations. Steroids 2010; 75:1075-81. [PMID: 20633571 DOI: 10.1016/j.steroids.2010.07.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2010] [Revised: 06/29/2010] [Accepted: 07/05/2010] [Indexed: 10/19/2022]
Abstract
17a-Methoxycarbonyl- and 17a-carboxamido-D-homoestra-1,3,5(10),17-tetraene derivatives were synthesized by palladium-catalyzed carbonylation reactions of the corresponding 17a-iodo-D-homoestra-1,3,5(10),17-tetraene derivatives using methanol and various amines as O- and N-nucleophiles, respectively. Both the natural (13β) and the epi (13α) series of compounds were isolated. The 17a-iodo-17-ene functionalities in the two 13-epimer series differ in reactivity. While the aminocarbonylations were practically complete in the 13β series in reasonable reaction time under mild conditions and high isolated yields were achieved, the corresponding 13α-17a-iodo-17-ene substrate has shown decreased reactivity resulting in moderate to low yields. However, under high carbon monoxide pressure (40 bar) excellent yields can be obtained even in the 13α series. The aminocarbonylation was completely chemoselective in both series, i.e., the corresponding 17a-carboxamido-17-ene derivatives were formed exclusively.
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Affiliation(s)
- Attila Takács
- Department of Inorganic Chemistry, University of Pécs, Pécs, Hungary
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8
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Frank É, Schneider G, Kádár Z, Wölfling J. Intramolecular Hydro-N-alkylation of Hydrazones and Oxime Ethers: Synthesis of Novel D-Secoestrone Isoquinuclidines via Domino 1,5-Hydride Shift/Cyclization. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900301] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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9
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Smith AB, Bosanac T, Basu K. Evolution of the total synthesis of (-)-okilactomycin exploiting a tandem oxy-cope rearrangement/oxidation, a Petasis-Ferrier union/rearrangement, and ring-closing metathesis. J Am Chem Soc 2009; 131:2348-58. [PMID: 19170499 PMCID: PMC2697663 DOI: 10.1021/ja8084669] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An effective, asymmetric total synthesis of the antitumor antibiotic (-)-okilactomycin (1), as well as assignment of the absolute configuration, has been achieved exploiting a convergent strategy. Highlights of the synthesis include a diastereoselective oxy-Cope rearrangement/oxidation sequence to install the C(1) and C(13) stereogenic centers, a Petasis-Ferrier union/rearrangement to construct the highly functionalized tetrahydropyranone inscribed within the 13-membered macrocycle ring, employing for the first time a sterically demanding acetal, an intramolecular chemoselective acylation to access an embedded bicyclic lactone, and an efficient ring-closing metathesis (RCM) reaction to generate the macrocyclic ring.
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Affiliation(s)
- Amos B Smith
- Department of Chemistry, Penn Center for Molecular Discovery, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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10
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Smith AB, Fox RJ, Razler TM. Evolution of the Petasis-Ferrier union/rearrangement tactic: construction of architecturally complex natural products possessing the ubiquitous cis-2,6-substituted tetrahydropyran structural element. Acc Chem Res 2008; 41:675-87. [PMID: 18489082 DOI: 10.1021/ar700234r] [Citation(s) in RCA: 101] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The frequent low abundance of architecturally complex natural products possessing significant bioregulatory properties mandates the development of rapid, efficient, and stereocontrolled synthetic tactics, not only to provide access to the biologically rare target but also to enable elaboration of analogues for the development of new therapeutic agents with improved activities and/or pharmacokinetic properties. In this Account, the genesis and evolution of the Petasis-Ferrier union/rearrangement tactic, in the context of natural product total syntheses, is described. The reaction sequence comprises a powerful tactic for the construction of the 2,6- cis-substituted tetrahydropyran ring system, a ubiquitous structural element often found in complex natural products possessing significant bioactivities. The three-step sequence, developed in our laboratory, extends two independent methods introduced by Ferrier and Petasis and now comprises: condensation between a chiral, nonracemic beta-hydroxy acid and an aldehyde to furnish a dioxanone; carbonyl olefination; and Lewis-acid-induced rearrangement of the resultant enol acetal to generate the 2,6- cis-substituted tetrahydropyranone system in a highly stereocontrolled fashion. To demonstrate the envisioned versatility and robustness of the Petasis-Ferrier union/rearrangement tactic in complex molecule synthesis, we exploited the method as the cornerstone in our now successful total syntheses of (+)-phorboxazole A, (+)-zampanolide, (+)-dactylolide, (+)-spongistatins 1 and 2, (-)-kendomycin, (-)-clavosolide A, and most recently, (-)-okilactomycin. Although each target comprises a number of synthetic challenges, this Account focuses on the motivation, excitement, and frustrations associated with the evolution and implementation of the Petasis-Ferrier union/rearrangement tactic. For example, during our (+)-phorboxazole A endeavor, we recognized and exploited the inherent pseudo symmetry of the 2,6- cis-substituted tetrahydropyranone product to overcome the inherent chelation bias of an adjacent oxazolidine ring during the Lewis-acid-promoted rearrangement. In addition, we discovered that a more concentrated solution of Cp2TiMe2 (0.7 versus 0.5 M in THF) with the addition of ethyl pivalate dramatically improves the yield in the Petasis-Tebbe olefination. During the (+)-zampanolide and (+)-dactylolide programs, we observed that the addition of trifluoromethanesulfonic acid (TfOH), especially on a preparative scale, was crucial to the efficiency of the initial condensation/union reaction, while our efforts toward (-)-kendomycin led to the improved implementation of a modified Kurihara condensation of the beta-hydroxy acid and aldehyde involving i-PrOTMS and TMSOTf. Finally, the successful deployment of the Petasis-Ferrier tactic in our synthesis of (-)-clavosolide A validated the viability of this tactic with a system possessing the highly acid-labile cyclopropylcarbinyl moiety, while the challenges en route to (-)-okilactomycin demonstrated that a neighboring alkene functionality can participate in an intramolecular Prins cyclization during the TMSOTf-promoted union process, unless suitably protected.
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Affiliation(s)
- Amos B. Smith
- Department of Chemistry, Monell Chemical Senses Center, and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Richard J. Fox
- Department of Chemistry, Monell Chemical Senses Center, and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Thomas M. Razler
- Department of Chemistry, Monell Chemical Senses Center, and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104
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11
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Affiliation(s)
- Amos B. Smith
- Department of Chemistry, Laboratory for Research on the Structure of Matter, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Kallol Basu
- Department of Chemistry, Laboratory for Research on the Structure of Matter, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Todd Bosanac
- Department of Chemistry, Laboratory for Research on the Structure of Matter, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104
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12
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Du H, Liu K, Li W. Catalytic Hydrogenation of Halosteroidal Derivatives by Bipyridine or Phenanthroline Complexes of Copper(II) in Hydrazine Aqueous Media. SYNTHETIC COMMUN 2006. [DOI: 10.1080/00397910500408522] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Huang‐Chi Du
- a Institute of Chemistry, Academia Sinica , Taipei, Taiwan
| | - Kung‐Cheng Liu
- a Institute of Chemistry, Academia Sinica , Taipei, Taiwan
| | - Wen‐Shan Li
- a Institute of Chemistry, Academia Sinica , Taipei, Taiwan
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13
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14
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Mernyák E, Schneider G, Herbst-Irmer R, Kubas M, Wölfling J. Synthesis and stereochemical investigations of novel nitrogen-containing 13alpha-estrone derivatives. Steroids 2006; 71:558-64. [PMID: 16620895 DOI: 10.1016/j.steroids.2006.01.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/15/2005] [Revised: 01/25/2006] [Accepted: 01/26/2006] [Indexed: 10/24/2022]
Abstract
Novel tetrahydroquinoline 11 and N-aryl d-homo derivatives 12 in the 13alpha-estrone series were synthesized effectively, starting from the secoaldehyde 8 and mono- or disubstituted anilines 9. The chemoselectivity of the cyclization reactions depended upon the nature of the substituents in the anilines. All transformations proceeded in a highly stereoselective manner, yielding only one diastereomer. Condensed 11 and d-homo derivatives 12 both have the usual ring C chair conformation in the solid state.
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Affiliation(s)
- Erzsébet Mernyák
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary
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15
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Szájli A, Wölfling J, Mernyák E, Minorics R, Márki A, Falkay G, Schneider G. Neighboring group participation. Part 16. Stereoselective synthesis and receptor-binding examination of the four stereoisomers of 16-bromomethyl-3,17-estradiols. Steroids 2006; 71:141-53. [PMID: 16297947 DOI: 10.1016/j.steroids.2005.09.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2005] [Revised: 08/31/2005] [Accepted: 09/08/2005] [Indexed: 11/30/2022]
Abstract
The four possible isomers of 3-benzyloxy-16-hydroxymethylestra-1,3,5(10)-trien-17-ol (1a-4a) with proven configurations were converted into the corresponding 3-benzyloxy-16-bromomethylestra-1,3,5(10)-triene-3,17-diols (5e-8e). Depending on the reaction conditions the cis isomers of 3-benzyloxy-16-hydroxymethylestra-1,3,5(10)-trien-17-ol (1a and 2a) were transformed into 3-benzyloxy-16-bromomethylestra-1,3,5(10)-trien-17-yl acetate (5b and 6b) or 16-bromomethyl-3-hydroxyestra-1,3,5(10)-trien-17-yl acetate (5c and 6c) on treatment with HBr and acetic acid. The mechanism of the process can be interpreted as involving front-side neighboring group participation. Under similar experimental conditions, the trans isomers (3a and 4a) yielded only 3-benzyloxy-16-acetoxymethylestra-1,3,5(10)-trien-17-yl acetates (3b and 4b) or 16-acetoxymethylestra-1,3,5(10)-triene-3,17-diyl diacetates (3d and 4d). Both the cis (1a and 2a) and the trans (3a, and 4a) isomers were transformed into 16-bromomethylestra-1,3,5(10)-trien-17-ol (5a-8a) by the Appel reaction on treatment with CBr4/Ph3P. Debenzylation of 5a-8a was carried out with HBr and acetic acid to yield 5e-8e. The debenzylation process in the presence of acetic anhydride produces the diacetates 5d-8d. The structures of the compounds were determined by means of MS, 1H NMR and 13C NMR spectroscopic methods. Compounds 5c-8c and 5e-8e were tested in a radioligand-binding assay. Except for the affinity of 7e for the estrogen receptor (Ki=2.55 nM), the affinities of the eight compounds (5c-8c and 5e-8e) for the estrogen, androgen and progesterone receptors are low (Ki > 0.55, 0.52 and 0.21 microM, respectively).
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Affiliation(s)
- Agota Szájli
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary
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16
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Hong BC, Chen FL, Chen SH, Liao JH, Lee GH. Intramolecular Diels−Alder Cycloadditions of Fulvenes. Application to the Kigelinol, Neoamphilectane, and Kempane Skeletons. Org Lett 2005; 7:557-60. [PMID: 15704893 DOI: 10.1021/ol047730m] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A variety of polycyclic ring skeletons (e.g., kigelinol, neoamphilectane, and kempene systems) can be prepared rapidly via intramolecular Diels-Alder cycloadditions (IMDA) of fulvenes. The length of the tethers and the diversity of the substituents on the fulvene core dictate the nature of the IMDA pathway. [reaction: see text]
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Affiliation(s)
- Bor-Cherng Hong
- Department of Chemistry, National Chung Cheng University, Chia-Yi, 621 Taiwan, R.O.C.
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17
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Schönecker B, Zheldakova T, Lange C, Günther W, Görls H, Bohl M. Intramolecular γ-Hydroxylations of Nonactivated CH Bonds with Copper Complexes and Molecular Oxygen. Chemistry 2004; 10:6029-42. [PMID: 15521055 DOI: 10.1002/chem.200306054] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Copper(I) complexes incorporating the isomeric bidentate ligands IMPY (iminomethyl-2-pyridines) or AMPY (aminomethylene-2-pyridines) are quite unusual in their ability to bind and activate molecular oxygen. Using these complexes, hydroxylations of nonactivated CH, CH2, or CH3 groups in the gamma-position in relation to the imino-nitrogen atom, and with a specific orientation of one H atom with respect to the binuclear Cu-O species, can be achieved in synthetically useful yields. Through mechanistic studies employing conformationally well-defined molecules (for example, cyclic isoprenoids), coupled with solid-state X-ray structure analyses and force-field calculations, we postulate a seven-membered transition state for this reaction in which six atoms lie approximately in a plane. This plane is defined by the positions of the lone pairs on the nitrogen atoms, as well as the copper and the oxygen atoms. For a successful hydroxylation, one hydrogen atom should be located close to this plane. Prediction of the stereochemical course of these reactions is possible based on a simple geometrical criterion. The convenient introduction of IMPY and AMPY groups as auxiliaries into oxo and primary amino compounds and the simple hydrolysis after the hydroxylation procedure has allowed the synthesis of 3-hydroxy-1-oxo and 3-hydroxy-1-amino compounds. If desired, the 3-hydroxy-1-IMPY and -1-AMPY compounds can be reduced with NaBH4 to obtain 3-hydroxy-1-aminomethylpyridines. For a successful hydroxylation procedure, the method employed for the synthesis of the CuI complexes is very important. Starting either from CuI salts or from CuII salts with a subsequent reduction with benzoin/triethylamine may turn out to be the better way, depending on the ligand and the molecular structure.
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Affiliation(s)
- Bruno Schönecker
- Institut für Organische Chemie und Makromolekulare Chemie der Friedrich-Schiller-Universität Jena, Humboldtstrasse 10, 07743 Jena, Germany.
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18
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Wölfling J, Mernyák E, Forgó P, Schneider G. Stereoselective halogenation of the 16-hydroxymethyl-3-methoxy-13alpha-estra-1,3,5(10)-trien-17-ols and their solvolytic investigation. Steroids 2003; 68:451-8. [PMID: 12798496 DOI: 10.1016/s0039-128x(03)00048-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The primary hydroxy functions of 16alpha-hydroxymethyl-3-methoxy-13alpha-estra-1,3,5(10)-trien-17beta-ol (3a) and 16beta-hydroxymethyl-3-methoxy-13alpha-estra-1,3,5(10)-trien-17alpha-ol (4a) were stereoselectively transformed into good leaving groups. On alkaline methanolysis of the 16-halomethyl or 16-tolylsulfonyloxymethyl derivatives, a new D-seco-13alpha-estrone derivative was obtained in high yield.
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Affiliation(s)
- János Wölfling
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary
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19
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Wölfling J, Mernyák E, Frank E, Falkay G, Márki A, Minorics R, Schneider G. Synthesis and receptor-binding examinations of the normal and 13-epi-D-homoestrones and their 3-methyl ethers. Steroids 2003; 68:277-88. [PMID: 12628691 DOI: 10.1016/s0039-128x(02)00181-2] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
An effective epimerization of the normal estrone 3-methyl and 3-benzyl ethers by using o-phenylenediamine and AcOH made the possibility for facile entry into the 13alpha-estrone series. Combination of this synthetic methodology with an isolation step carried out by means of the Girard-P reagent, the corresponding ethers of 13-epi-estrone were obtained in excellent yields. The 3-hydroxy and 3-methoxy D-homoestrone derivatives in both the normal and the 13alpha-estrone series were then synthesized and tested in vitro in a radioligand-binding assay. The estrogen receptor recognizes these compounds, but their relative binding affinities (RBAs) are lower than that of the reference compound 3,17beta-estradiol. The progesterone receptor-binding affinities of the four D-homo derivatives were also tested showing low values for 13alpha-D-homoestrone and its 3-methyl ether. Pharmacologically, these 13alpha-D-homoestrone derivatives are estrogen receptor-selective molecules.
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Affiliation(s)
- János Wölfling
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720, Szeged, Hungary
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