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Horváth Á, Steib A, Nehr-Majoros A, Kántás B, Király Á, Racskó M, Tóth BI, Szánti-Pintér E, Kudová E, Skoda-Földes R, Helyes Z, Szőke É. Anti-Nociceptive Effects of Sphingomyelinase and Methyl-Beta-Cyclodextrin in the Icilin-Induced Mouse Pain Model. Int J Mol Sci 2024; 25:4637. [PMID: 38731855 PMCID: PMC11083984 DOI: 10.3390/ijms25094637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2024] [Revised: 04/17/2024] [Accepted: 04/19/2024] [Indexed: 05/13/2024] Open
Abstract
The thermo- and pain-sensitive Transient Receptor Potential Melastatin 3 and 8 (TRPM3 and TRPM8) ion channels are functionally associated in the lipid rafts of the plasma membrane. We have already described that cholesterol and sphingomyelin depletion, or inhibition of sphingolipid biosynthesis decreased the TRPM8 but not the TRPM3 channel opening on cultured sensory neurons. We aimed to test the effects of lipid raft disruptors on channel activation on TRPM3- and TRPM8-expressing HEK293T cells in vitro, as well as their potential analgesic actions in TRPM3 and TRPM8 channel activation involving acute pain models in mice. CHO cell viability was examined after lipid raft disruptor treatments and their effects on channel activation on channel expressing HEK293T cells by measurement of cytoplasmic Ca2+ concentration were monitored. The effects of treatments were investigated in Pregnenolone-Sulphate-CIM-0216-evoked and icilin-induced acute nocifensive pain models in mice. Cholesterol depletion decreased CHO cell viability. Sphingomyelinase and methyl-beta-cyclodextrin reduced the duration of icilin-evoked nocifensive behavior, while lipid raft disruptors did not inhibit the activity of recombinant TRPM3 and TRPM8. We conclude that depletion of sphingomyelin or cholesterol from rafts can modulate the function of native TRPM8 receptors. Furthermore, sphingolipid cleavage provided superiority over cholesterol depletion, and this method can open novel possibilities in the management of different pain conditions.
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Affiliation(s)
- Ádám Horváth
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti Str. 12., H-7624 Pécs, Hungary; (Á.H.); (A.S.); (A.N.-M.); (B.K.); (Á.K.); (Z.H.)
- Department of Pharmacology, Faculty of Pharmacy, University of Pécs, Rókus Str. 2., H-7624 Pécs, Hungary
| | - Anita Steib
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti Str. 12., H-7624 Pécs, Hungary; (Á.H.); (A.S.); (A.N.-M.); (B.K.); (Á.K.); (Z.H.)
| | - Andrea Nehr-Majoros
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti Str. 12., H-7624 Pécs, Hungary; (Á.H.); (A.S.); (A.N.-M.); (B.K.); (Á.K.); (Z.H.)
- National Laboratory for Drug Research and Development, Magyar Tudósok Cct. 2., H-1117 Budapest, Hungary
- Hungarian Research Network, Chronic Pain Research Group, University of Pécs, Szigeti Str. 12., H-7624 Pécs, Hungary
| | - Boglárka Kántás
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti Str. 12., H-7624 Pécs, Hungary; (Á.H.); (A.S.); (A.N.-M.); (B.K.); (Á.K.); (Z.H.)
- Department of Obstetrics and Gynaecology, University of Pécs, Édesanyák Str. 17., H-7624 Pécs, Hungary
| | - Ágnes Király
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti Str. 12., H-7624 Pécs, Hungary; (Á.H.); (A.S.); (A.N.-M.); (B.K.); (Á.K.); (Z.H.)
- National Laboratory for Drug Research and Development, Magyar Tudósok Cct. 2., H-1117 Budapest, Hungary
- Hungarian Research Network, Chronic Pain Research Group, University of Pécs, Szigeti Str. 12., H-7624 Pécs, Hungary
| | - Márk Racskó
- Department of Physiology, Faculty of Medicine, University of Debrecen, Nagyerdei Cct. 98., H-4032 Debrecen, Hungary; (M.R.); (B.I.T.)
| | - Balázs István Tóth
- Department of Physiology, Faculty of Medicine, University of Debrecen, Nagyerdei Cct. 98., H-4032 Debrecen, Hungary; (M.R.); (B.I.T.)
| | - Eszter Szánti-Pintér
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo Namesti 2, 166 10 Prague, Czech Republic; (E.S.-P.); (E.K.)
| | - Eva Kudová
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo Namesti 2, 166 10 Prague, Czech Republic; (E.S.-P.); (E.K.)
| | - Rita Skoda-Földes
- Institute of Chemistry, Department of Organic Chemistry, University of Pannonia, Egyetem Str. 10., H-8200 Veszprém, Hungary;
| | - Zsuzsanna Helyes
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti Str. 12., H-7624 Pécs, Hungary; (Á.H.); (A.S.); (A.N.-M.); (B.K.); (Á.K.); (Z.H.)
- National Laboratory for Drug Research and Development, Magyar Tudósok Cct. 2., H-1117 Budapest, Hungary
- Hungarian Research Network, Chronic Pain Research Group, University of Pécs, Szigeti Str. 12., H-7624 Pécs, Hungary
- PharmInVivo Ltd., Szondy György Str. 10., H-7629 Pécs, Hungary
| | - Éva Szőke
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti Str. 12., H-7624 Pécs, Hungary; (Á.H.); (A.S.); (A.N.-M.); (B.K.); (Á.K.); (Z.H.)
- National Laboratory for Drug Research and Development, Magyar Tudósok Cct. 2., H-1117 Budapest, Hungary
- Hungarian Research Network, Chronic Pain Research Group, University of Pécs, Szigeti Str. 12., H-7624 Pécs, Hungary
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Nehr-Majoros AK, Király Á, Helyes Z, Szőke É. Lipid raft disruption as an opportunity for peripheral analgesia. Curr Opin Pharmacol 2024; 75:102432. [PMID: 38290404 DOI: 10.1016/j.coph.2024.102432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 12/17/2023] [Accepted: 01/02/2024] [Indexed: 02/01/2024]
Abstract
Chronic pain conditions are unmet medical needs, since the available drugs, opioids, non-steroidal anti-inflammatory/analgesic drugs and adjuvant analgesics do not provide satisfactory therapeutic effect in a great proportion of patients. Therefore, there is an urgent need to find novel targets and novel therapeutic approaches that differ from classical pharmacological receptor antagonism. Most ion channels and receptors involved in pain sensation and processing such as Transient Receptor Potential ion channels, opioid receptors, P2X purinoreceptors and neurokinin 1 receptor are located in the lipid raft regions of the plasma membrane. Targeting the membrane lipid composition and structure by sphingolipid or cholesterol depletion might open future perspectives for the therapy of chronic inflammatory, neuropathic or cancer pain, most importantly acting at the periphery.
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Affiliation(s)
- Andrea Kinga Nehr-Majoros
- Department of Pharmacology and Pharmacotherapy, Medical School & Centre for Neuroscience, University of Pécs, 12 Szigeti Street, H-7624, Pécs, Hungary; National Laboratory for Drug Research and Development, Budapest, Hungary; Hungarian Research Network, Chronic Pain Research Group, Pécs, Hungary
| | - Ágnes Király
- Department of Pharmacology and Pharmacotherapy, Medical School & Centre for Neuroscience, University of Pécs, 12 Szigeti Street, H-7624, Pécs, Hungary; National Laboratory for Drug Research and Development, Budapest, Hungary; Hungarian Research Network, Chronic Pain Research Group, Pécs, Hungary
| | - Zsuzsanna Helyes
- Department of Pharmacology and Pharmacotherapy, Medical School & Centre for Neuroscience, University of Pécs, 12 Szigeti Street, H-7624, Pécs, Hungary; National Laboratory for Drug Research and Development, Budapest, Hungary; Hungarian Research Network, Chronic Pain Research Group, Pécs, Hungary
| | - Éva Szőke
- Department of Pharmacology and Pharmacotherapy, Medical School & Centre for Neuroscience, University of Pécs, 12 Szigeti Street, H-7624, Pécs, Hungary; National Laboratory for Drug Research and Development, Budapest, Hungary; Hungarian Research Network, Chronic Pain Research Group, Pécs, Hungary.
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Herman BE, Gardi J, Julesz J, Tömböly C, Szánti-Pintér E, Fehér K, Skoda-Földes R, Szécsi M. Steroidal ferrocenes as potential enzyme inhibitors of the estrogen biosynthesis. Biol Futur 2021; 71:249-264. [PMID: 34554507 DOI: 10.1007/s42977-020-00023-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2019] [Accepted: 06/04/2020] [Indexed: 01/13/2023]
Abstract
The potential inhibitory effect of diverse triazolyl-ferrocene steroids on key enzymes of the estrogen biosynthesis was investigated. Test compounds were synthesized via copper-catalyzed cycloaddition of steroidal azides and ferrocenyl-alkynes using our efficient methodology published previously. Inhibition of human aromatase, steroid sulfatase (STS) and 17β-hydroxysteroid dehydrogenase type 1 (17β-HSD1) activities was investigated with in vitro radiosubstrate incubations. Some of the test compounds were found to be potent inhibitors of the STS. A compound bearing ferrocenyl side chain on the C-2 displayed a reversible inhibition, whereas C-16 and C-17 derivatives displayed competitive irreversible binding mechanism toward the enzyme. 17α-Triazolyl-ferrocene derivatives of 17β-estradiol exerted outstanding inhibitory effect and experiments demonstrated a key role of the ferrocenyl moiety in the enhanced binding affinity. Submicromolar IC50 and Ki parameters enroll these compounds to the group of the most effective STS inhibitors published so far. STS inhibitory potential of the steroidal ferrocenes may lead to the development of novel compounds able to suppress in situ biosynthesis of 17β-estradiol in target tissues.
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Affiliation(s)
- Bianka Edina Herman
- 1st Department of Medicine, University of Szeged, Korányi fasor 8-10, P. O. Box 427, Szeged, 6720, Hungary
| | - János Gardi
- 1st Department of Medicine, University of Szeged, Korányi fasor 8-10, P. O. Box 427, Szeged, 6720, Hungary
| | - János Julesz
- 1st Department of Medicine, University of Szeged, Korányi fasor 8-10, P. O. Box 427, Szeged, 6720, Hungary
| | - Csaba Tömböly
- Laboratory of Chemical Biology, Institute of Biochemistry, Biological Research Centre, Hungarian Academy of Sciences, Temesvári körút 62, P. O. Box 521, Szeged, 6726, Hungary
| | - Eszter Szánti-Pintér
- Department of Organic Chemistry, Institute of Chemistry, University of Pannonia, Egyetem utca 10, P. O. Box 158, Veszprém, 8200, Hungary
| | - Klaudia Fehér
- Department of Organic Chemistry, Institute of Chemistry, University of Pannonia, Egyetem utca 10, P. O. Box 158, Veszprém, 8200, Hungary
| | - Rita Skoda-Földes
- Department of Organic Chemistry, Institute of Chemistry, University of Pannonia, Egyetem utca 10, P. O. Box 158, Veszprém, 8200, Hungary.
| | - Mihály Szécsi
- 1st Department of Medicine, University of Szeged, Korányi fasor 8-10, P. O. Box 427, Szeged, 6720, Hungary.
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Promising applications of steroid сonjugates for cancer research and treatment. Eur J Med Chem 2020; 210:113089. [PMID: 33321260 DOI: 10.1016/j.ejmech.2020.113089] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 11/26/2020] [Accepted: 12/04/2020] [Indexed: 12/30/2022]
Abstract
The conjugation of biologically active molecules is a powerful tool for drug discovery used to target a variety of multifunctional diseases including cancer. Conjugated drugs can provide combination therapies in a single multi-functional agent and, by doing so, be more specific and powerful than conventional classic treatments. Steroids are widely used for conjugation with other biological active molecules. This review refers to investigations of steroid conjugates as potential anticancer agents carried out mostly over the past decade. It consists of five parts in which the data concerning structure and anticancer activity of steroid conjugates with DNA alkylating agents, metallocomplexes, approved drugs, some biological active molecules, some natural compounds and related synthetic analogs are described.
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Horváth Á, Biró-Sütő T, Kántás B, Payrits M, Skoda-Földes R, Szánti-Pintér E, Helyes Z, Szőke É. Antinociceptive Effects of Lipid Raft Disruptors, a Novel Carboxamido-Steroid and Methyl β-Cyclodextrin, in Mice by Inhibiting Transient Receptor Potential Vanilloid 1 and Ankyrin 1 Channel Activation. Front Physiol 2020; 11:559109. [PMID: 33071817 PMCID: PMC7539994 DOI: 10.3389/fphys.2020.559109] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 08/18/2020] [Indexed: 12/29/2022] Open
Abstract
Transient Receptor Potential Vanilloid 1 and Ankyrin 1 (TRPV1, TRPA1) cation channels are expressed in nociceptive primary sensory neurons, and play an integrative role in pain processing and inflammatory functions. Lipid rafts are liquid-ordered plasma membrane microdomains rich in cholesterol, sphingomyelin, and gangliosides. We earlier proved that lipid raft disintegration by cholesterol depletion using a novel carboxamido-steroid compound (C1) and methyl β-cyclodextrin (MCD) significantly and concentration-dependently inhibit TRPV1 and TRPA1 activation in primary sensory neurons and receptor-expressing cell lines. Here we investigated the effects of C1 compared to MCD in mouse pain models of different mechanisms. Both C1 and MCD significantly decreased the number of the TRPV1 activation (capsaicin)-induced nocifensive eye-wiping movements in the first hour by 45% and 32%, respectively, and C1 also in the second hour by 26%. Furthermore, C1 significantly decreased the TRPV1 stimulation (resiniferatoxin)-evoked mechanical hyperalgesia involving central sensitization processes, while its inhibitory effect on thermal allodynia was not statistically significant. In contrast, MCD did not affect these resiniferatoxin-evoked nocifensive responses. Both C1 and MCD had inhibitory action on TRPA1 activation (formalin)-induced acute nocifensive reactions (paw liftings, lickings, holdings, and shakings) in the second, neurogenic inflammatory phase by 36% and 51%, respectively. These are the first in vivo data showing that our novel lipid raft disruptor carboxamido-steroid compound exerts antinociceptive and antihyperalgesic effects by inhibiting TRPV1 and TRPA1 ion channel activation similarly to MCD, but in 150-fold lower concentrations. It is concluded that C1 is a useful experimental tool to investigate the effects of cholesterol depletion in animal models, and it also might open novel analgesic drug developmental perspectives.
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Affiliation(s)
- Ádám Horváth
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Pécs, Hungary
| | - Tünde Biró-Sütő
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Pécs, Hungary
| | - Boglárka Kántás
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Pécs, Hungary
| | - Maja Payrits
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Pécs, Hungary
| | - Rita Skoda-Földes
- Department of Organic Chemistry, Institute of Chemistry, University of Pannonia, Veszprém, Hungary
| | - Eszter Szánti-Pintér
- Department of Organic Chemistry, Institute of Chemistry, University of Pannonia, Veszprém, Hungary
| | - Zsuzsanna Helyes
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Pécs, Hungary
| | - Éva Szőke
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Pécs, Hungary
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Sághy É, Payrits M, Bíró-Sütő T, Skoda-Földes R, Szánti-Pintér E, Erostyák J, Makkai G, Sétáló G, Kollár L, Kőszegi T, Csepregi R, Szolcsányi J, Helyes Z, Szőke É. Carboxamido steroids inhibit the opening properties of transient receptor potential ion channels by lipid raft modulation. J Lipid Res 2018; 59:1851-1863. [PMID: 30093524 PMCID: PMC6168298 DOI: 10.1194/jlr.m084723] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Revised: 08/03/2018] [Indexed: 11/20/2022] Open
Abstract
Transient Receptor Potential (TRP) cation channels, like the TRP Vanilloid 1 (TRPV1) and TRP Ankyrin 1 (TRPA1), are expressed on primary sensory neurons. These thermosensor channels play a role in pain processing. We have provided evidence previously that lipid raft disruption influenced the TRP channel activation, and a carboxamido-steroid compound (C1) inhibited TRPV1 activation. Therefore, our aim was to investigate whether this compound exerts its effect through lipid raft disruption and the steroid backbone (C3) or whether altered position of the carboxamido group (C2) influences the inhibitory action by measuring Ca2+ transients on isolated neurons and calcium-uptake on receptor-expressing CHO cells. Membrane cholesterol content was measured by filipin staining and membrane polarization by fluorescence spectroscopy. Both the percentage of responsive cells and the magnitude of the intracellular Ca2+ enhancement evoked by the TRPV1 agonist capsaicin were significantly inhibited after C1 and C2 incubation, but not after C3 administration. C1 was able to reduce other TRP channel activation as well. The compounds induced cholesterol depletion in CHO cells, but only C1 induced changes in membrane polarization. The inhibitory action of the compounds on TRP channel activation develops by lipid raft disruption, and the presence and the position of the carboxamido group is essential.
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Affiliation(s)
- Éva Sághy
- Department of Pharmacology and Pharmacotherapy, University of Pécs, Hungary.,Medical School, János Szentágothai Research Center and Centre for Neuroscience, University of Pécs, Hungary.,Department of Pharmacology and Pharmacotherapy, Semmelweis University, Budapest, Hungary
| | - Maja Payrits
- Department of Pharmacology and Pharmacotherapy, University of Pécs, Hungary.,Medical School, János Szentágothai Research Center and Centre for Neuroscience, University of Pécs, Hungary
| | - Tünde Bíró-Sütő
- Department of Pharmacology and Pharmacotherapy, University of Pécs, Hungary.,Medical School, János Szentágothai Research Center and Centre for Neuroscience, University of Pécs, Hungary
| | - Rita Skoda-Földes
- Department of Organic Chemistry, Institute of Chemistry, University of Pannonia, Veszprém, Hungary
| | - Eszter Szánti-Pintér
- Department of Organic Chemistry, Institute of Chemistry, University of Pannonia, Veszprém, Hungary
| | - János Erostyák
- Medical School, János Szentágothai Research Center and Centre for Neuroscience, University of Pécs, Hungary.,Department of Experimental Physics, University of Pécs, Hungary
| | - Géza Makkai
- Medical School, János Szentágothai Research Center and Centre for Neuroscience, University of Pécs, Hungary.,Department of Experimental Physics, University of Pécs, Hungary
| | - György Sétáló
- Medical School, János Szentágothai Research Center and Centre for Neuroscience, University of Pécs, Hungary.,Department of Medical Biology, University of Pécs, Hungary
| | - László Kollár
- Department of Inorganic Chemistry and MTA-PTE Research Group for Selective Chemical Syntheses, University of Pécs, Hungary
| | - Tamás Kőszegi
- Medical School, János Szentágothai Research Center and Centre for Neuroscience, University of Pécs, Hungary.,Department of Laboratory Medicine, University of Pécs, Hungary
| | - Rita Csepregi
- Medical School, János Szentágothai Research Center and Centre for Neuroscience, University of Pécs, Hungary.,Department of Laboratory Medicine, University of Pécs, Hungary
| | - János Szolcsányi
- Department of Pharmacology and Pharmacotherapy, University of Pécs, Hungary.,Medical School, János Szentágothai Research Center and Centre for Neuroscience, University of Pécs, Hungary
| | - Zsuzsanna Helyes
- Department of Pharmacology and Pharmacotherapy, University of Pécs, Hungary.,Medical School, János Szentágothai Research Center and Centre for Neuroscience, University of Pécs, Hungary.,National Brain Research Program-2 Chronic Pain Research Group, Pécs, Hungary
| | - Éva Szőke
- Department of Pharmacology and Pharmacotherapy, University of Pécs, Hungary .,Medical School, János Szentágothai Research Center and Centre for Neuroscience, University of Pécs, Hungary.,National Brain Research Program-2 Chronic Pain Research Group, Pécs, Hungary
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Influence of base additives on the selectivity of palladium-catalysed aminocarbonylation: Highly selective functionalization of a cavitand scaffold. MOLECULAR CATALYSIS 2018. [DOI: 10.1016/j.mcat.2017.10.031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Ma Y, Yun YK, Wondergem Nee Lukesh J, Sar A, Gone JR, Lindeman S, Donaldson WA. Reactivity of (1-methoxycarbonylpentadienyl)iron(1+) cations with hydride, methyl, and nitrogen nucleophiles. Tetrahedron 2017; 73:4493-4500. [PMID: 29200513 DOI: 10.1016/j.tet.2017.06.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The reaction of tricarbonyl and (dicarbonyl)triphenylphosphine (1-methoxycarbonyl-pentadientyl)iron(1+) cations 7 and 8 with methyl lithium, NaBH3CN, or potassium phthalimide affords (pentenediyl)iron complexes 9a-c and 11a-b, while reaction with dimethylcuprate, gave (E,Z-diene)iron complexes 10 and 12. Oxidatively induced-reductive elimination of 9a-c gave vinylcyclopropanecarboxylates 17a-c. The optically active vinylcyclopropane (+)-17a, prepared from (1S)-7, undergoes olefin cross-metathesis with excess (+)-18 to yield (+)-19, a C9-C16 synthon for the antifungal agent ambruticin. Alternatively reaction of 7 with methanesulfonamide or trimethylsilylazide gave (E,E-diene)iron complexes 14d and e. Huisgen [3+2] cyclization of the (azidodienyl)iron complex 14e with alkynes afforded triazoles 25a-e.
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Affiliation(s)
- Yuzhi Ma
- Department of Chemistry, Marquette University, P. O. Box 1881, Milwaukee, WI 53201-1881 USA
| | - Young K Yun
- Department of Chemistry, Marquette University, P. O. Box 1881, Milwaukee, WI 53201-1881 USA
| | | | - Anobick Sar
- Department of Chemistry, Marquette University, P. O. Box 1881, Milwaukee, WI 53201-1881 USA
| | - Jayapal Reddy Gone
- Department of Chemistry, Marquette University, P. O. Box 1881, Milwaukee, WI 53201-1881 USA
| | - Sergey Lindeman
- Department of Chemistry, Marquette University, P. O. Box 1881, Milwaukee, WI 53201-1881 USA
| | - William A Donaldson
- Department of Chemistry, Marquette University, P. O. Box 1881, Milwaukee, WI 53201-1881 USA
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