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Tomlovich RA, Lash TD. Synthesis, Spectroscopic Properties, and Metalation of 3-Alkoxybenziporphyrins. Molecules 2024; 29:1903. [PMID: 38675721 PMCID: PMC11054816 DOI: 10.3390/molecules29081903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2024] [Revised: 04/15/2024] [Accepted: 04/19/2024] [Indexed: 04/28/2024] Open
Abstract
A series of 5-alkoxy-1,3-benzenedicarbaldehydes and related dimers were prepared in three steps from dimethyl 5-hydroxyisophthalate. Acid catalyzed condensation of the dialdehydes with a tripyrrane dicarboxylic acid, followed by oxidation with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone, afforded good yields of 3-alkoxybenziporphyrins, although dimeric tetraaldehydes failed to give isolatable porphyrinoid products. Proton NMR spectroscopy gave no indication of an aromatic ring current, but addition of trifluoroacetic acid resulted in the formation of dications that exhibited weakly diatropic characteristics. Spectroscopic titration with TFA demonstrated that stepwise protonation took place, generating monocationic and dicationic species. 3-Alkoxybenziporphyrins reacted with nickel(II) or palladium(II) acetate to give the related nickel(II) or palladium(II) complexes. These stable organometallic derivatives showed increased diatropic properties that were most pronounced for the palladium(II) complexes. These unique porphyrinoids provide further insights into the properties of benziporphyrins.
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Affiliation(s)
| | - Timothy D. Lash
- Department of Chemistry, Illinois State University, Normal, IL 61790-4160, USA;
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2
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Varak P, Ravikanth M. Near-infrared absorbing nonaromatic core-modified meta-benzicalixhexaphyrin(1. 1. 1.1.1.1)s. Org Biomol Chem 2024; 22:2231-2240. [PMID: 38369870 DOI: 10.1039/d4ob00095a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2024]
Abstract
Stable nonaromatic core-modified m-benzicalixhexaphyrins containing one m-phenylene ring, four pyrrole rings and one heterocyclic ring such as furan, thiophene, selenophene and telluorophene connected via four meso-sp2 carbons and two meso-sp3 carbons in a macrocyclic framework were synthesized. The m-benzitripyrrane dicarbinol was condensed with 16-heterocycle tripyrranes under mild acid-catalyzed and inert conditions followed by open-air oxidation with DDQ to obtain macrocycles in 2-5% yields. The presence of two -OH groups in the cis-orientation at two different meso-sp3 carbons, which are adjacent to the m-phenylene ring of the macrocycle, was confirmed through detailed 1D and 2D NMR studies. NMR studies indicated that the heterocyclic ring present across the m-phenylene ring prefers to be in the inverted conformation in these macrocycles. The macrocycles exhibited two intense absorption bands in the lower wavelength region of 320-580 nm and one broad absorption band that extended from the visible to NIR region, and the protonated derivatives of such macrocycles showed significant bathochromic shifts to the NIR region. Additionally, the electrochemical studies indicated that the macrocycles underwent easier oxidation due to their electron-rich nature. DFT studies revealed that the macrocycles adopted highly distorted conformation, which was consistent with experimental results.
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Affiliation(s)
- Pooja Varak
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.
| | - Mangalampalli Ravikanth
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.
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3
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Organometallic Chemistry within the Structured Environment Provided by the Macrocyclic Cores of Carbaporphyrins and Related Systems. Molecules 2023; 28:molecules28031496. [PMID: 36771158 PMCID: PMC9920839 DOI: 10.3390/molecules28031496] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 01/27/2023] [Accepted: 01/30/2023] [Indexed: 02/08/2023] Open
Abstract
The unique environment within the core of carbaporphyrinoid systems provides a platform to explore unusual organometallic chemistry. The ability of these structures to form stable organometallic derivatives was first demonstrated for N-confused porphyrins but many other carbaporphyrin-type systems were subsequently shown to exhibit similar or complementary properties. Metalation commonly occurs with catalytically active transition metal cations and the resulting derivatives exhibit widely different physical, chemical and spectroscopic properties and range from strongly aromatic to nonaromatic and antiaromatic species. Metalation may trigger unusual, highly selective, oxidation reactions. Alkyl group migration has been observed within the cavity of metalated carbaporphyrins, and in some cases ring contraction of the carbocyclic subunit takes place. Over the past thirty years, studies in this area have led to multiple synthetic routes to carbaporphyrinoid ligands and remarkable organometallic chemistry has been reported. An overview of this important area is presented.
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Yadav B, Isar P, Ravikanth M. Synthesis and Studies of Fused Benzo-Benzisapphyrins. J Org Chem 2023; 88:395-402. [PMID: 36524818 DOI: 10.1021/acs.joc.2c02397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A series of rare examples of fused benzo-benzisapphyrins were synthesized readily by (3 + 2) condensation of benzodipyrrole-derived diol and para-benzitripyrrane in the presence of 0.5 equiv of TFA in CH2Cl2 under inert atmosphere conditions accompanied by DDQ oxidation in open air. The crude compounds were separated by basic alumina column chromatography and afforded pure fused benzo-benzisapphyrins in 20-22% yields. The fused sapphyrins were characterized in detail by high-resolution mass spectrometry (HRMS) and one-dimensional (1D) and two-dimensional (2D) NMR spectroscopy. The 1H NMR spectra recorded at both 298 and at 233 K clearly exhibited the presence of a strong diatropic ring current in benzo-benzisapphyrins, and the macrocycles are of aromatic nature. The DFT-optimized structure of benzo-benzisapphyrin revealed that the macrocycle was planar to a great extent due to the rigid structure of the dibenzopyrrole moiety, and the NICS(0) value of -11.2 ppm supports the aromatic nature of macrocycles. The absorption spectra of benzo-benzisapphyrins showed three weak Q bands approximately in the region of 650-900 nm and a strong Soret band at 480 nm, along with a shoulder band at ∼510 nm. The diprotonated derivative generated by the addition of excess TFA to the benzo-benzisapphyrin macrocycle exhibited bathochromically shifted absorption bands compared to the free base macrocycle.
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Affiliation(s)
- Bharti Yadav
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Prosenjit Isar
- Institute for Experimental Molecular Imaging, University Clinic, RWTH Aachen University, Forckenbeckstraβe 55, 52074 Aachen, Germany
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Thuita DW, Brückner C. Metal Complexes of Porphyrinoids Containing Nonpyrrolic Heterocycles. Chem Rev 2022; 122:7990-8052. [PMID: 35302354 DOI: 10.1021/acs.chemrev.1c00694] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The replacement of one or more pyrrolic building block(s) of a porphyrin by a nonpyrrolic heterocycle leads to the formation of so-called pyrrole-modified porphyrins (PMPs), porphyrinoids of broad structural variability. The wide range of coordination environments (type, number, charge, and architecture of the donor atoms) that the pyrrole-modified frameworks provide to the central metal ions, the frequent presence of donor atoms at their periphery, and their often observed nonplanarity or conformational flexibility distinguish the complexes of the PMPs clearly from those of the traditional square-planar, dianionic, N4-coordinating (hydro)porphyrins. Their different coordination properties suggest their utilization in areas beyond which regular metalloporphyrins are suitable. Following a general introduction to the synthetic methodologies available to generate pyrrole-modified porphyrins, their general structure, history, coordination chemistry, and optical properties, this Review highlights the chemical, electronic (optical), and structural differences of specific classes of metalloporphyrinoids containing nonpyrrolic heterocycles. The focus is on macrocycles with similar "tetrapyrrolic" architectures as porphyrins, thusly excluding the majority of expanded porphyrins. We highlight the relevance and application of these metal complexes in biological and technical fields as chemosensors, catalysts, photochemotherapeutics, or imaging agents. This Review provides an introduction to the field of metallo-PMPs as well as a comprehensive snapshot of the current state of the art of their synthesis, structures, and properties. It also aims to provide encouragement for the further study of these intriguing and structurally versatile metalloporphyrinoids.
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Affiliation(s)
- Damaris Waiyigo Thuita
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, United States
| | - Christian Brückner
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, United States
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Lash TD, Chaney ST, Johnson AL, Weisbond JT, Ferrence GM. Synthesis, metalation and antiaromatic properties of 22-hydroxybenziporphyrins. J PORPHYR PHTHALOCYA 2021. [DOI: 10.1142/s1088424621501030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Condensation of 5-alkyl-2-hydroxybenzene-1,3-dicarbaldehydes with a tripyrrane in the presence of trifluoroacetic acid (TFA), followed by oxidation with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ), gave two examples of 22-hydroxybenziporphyrins. Unlike a related meso-tetraphenyl-22-hydroxybenziporphyrin, these products were reasonably stable in solution. Dicationic species were obtained upon addition of TFA to CDCl3 solutions, and these exhibited weakly diatropic properties. However, the free base forms gave broad peaks for the macrocycle’s peripheral protons that fell into the range of 4.5–3.3 ppm, demonstrating that the system has paratropic characteristics that are consistent with the keto-tautomers. The porphyrin analogues gave broad, poorly resolved, UV-vis spectra of the type expected for nonaromatic or antiaromatic structures. Reaction of a hydroxybenziporphyrin with nickel(II), copper(II) or palladium(II) acetate gave the related coordination complexes. The nickel and palladium derivatives were structurally characterized by X-ray crystallography and exhibited buckled geometries with the phenolate units strongly pivoted away from the macrocyclic core.
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Affiliation(s)
- Timothy D. Lash
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, USA
| | - Sun T. Chaney
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, USA
| | - Amy L. Johnson
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, USA
| | - Jack T. Weisbond
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, USA
| | - Gregory M. Ferrence
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, USA
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Mori D, Yoneda T, Suzuki M, Hoshino T, Neya S. Deprotection of a benzyl unit induces a 22π aromatic macrocycle of 3-oxypyripentaphyrin(0.1.1.1.0) with strong NIR absorption. Org Biomol Chem 2020; 18:5334-5338. [PMID: 32608449 DOI: 10.1039/d0ob01213k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report aromaticity switching from a 6π pyridine ring to a 22π macrocyclic ring of 3-oxypyripentaphyrin(0.1.1.1.0). This system has potential applications in photodynamic therapy owing to macrocyclic aromaticity being selectively induced by protecting group removal and strong absorption bands produced in the NIR region especially in methanol.
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Affiliation(s)
- Daiki Mori
- Department of Pharmaceutical Sciences, Chiba University, Inohana, Chuo-ku, Chiba, 260-8675, Japan
| | - Tomoki Yoneda
- Department of Pharmaceutical Sciences, Chiba University, Inohana, Chuo-ku, Chiba, 260-8675, Japan and Division of Applied Chemistry, Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8 Kita-ku, Sapporo, Hokkaido 060-8628, Japan.
| | - Masaaki Suzuki
- Graduate School of Natural Science and Technology, Shimane University, 1060, Nishikawatsu-cho, Matsue, Shimane 690-8504, Japan
| | - Tyuji Hoshino
- Department of Pharmaceutical Sciences, Chiba University, Inohana, Chuo-ku, Chiba, 260-8675, Japan
| | - Saburo Neya
- Department of Pharmaceutical Sciences, Chiba University, Inohana, Chuo-ku, Chiba, 260-8675, Japan
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8
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A Pincer Motif Etched into a meta-Benziporphyrin Frame. TOP ORGANOMETAL CHEM 2020. [DOI: 10.1007/3418_2020_61] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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9
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Jain P, AbuSalim DI, Lash TD. adj-Dicarbaporphyrinoid Systems: Synthesis, Spectroscopic Characterization, and Reactivity of 23-Carbabenziporphyrins. J Org Chem 2019; 84:10237-10256. [DOI: 10.1021/acs.joc.9b01410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pankaj Jain
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Deyaa I. AbuSalim
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Timothy D. Lash
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
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10
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Ghosh A, Larsen S, Conradie J, Foroutan-Nejad C. Local versus global aromaticity in azuliporphyrin and benziporphyrin derivatives. Org Biomol Chem 2019; 16:7964-7970. [PMID: 30325395 DOI: 10.1039/c8ob01672k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Carbaporphyrinoids afford fascinating examples of competition between local and global aromaticity in conjugated, polycyclic systems. Thus, whereas density functional theory calculations reveal only a modest effect of metal complexation on the current density profiles of true carbaporphyrins and azuliporphyrins, the impact is much greater for benziporphyrins, underscoring a strong competition between local and global aromaticity in the latter system. Furthermore, the calculations shed light on the remarkable efficacy of suitably placed electron-donating substituents on the benzene ring in boosting the global diatropic currents in a metallobenziporphyrin.
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Affiliation(s)
- Abhik Ghosh
- Department of Chemistry, UiT - The Arctic University of Norway, 9037 Tromsø, Norway.
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11
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Abstract
An unprecedented tellurabenziporphyrin containing C, N, and Te donor atoms was synthesized by condensing benzitripyrrane and tellurophene diol under acid catalyzed conditions. The tellurabenziporphyrin readily forms a Pd(II) complex when treated with PdCl2 in CHCl3/CH3CN. The crystal structures of tellurabenziporphyrin and its Pd(II) complex revealed that the benzene ring hinders the π-electron delocalization. An unusual five-membered ring formed inside the macrocycle due to the strong interaction between "Te" and "N" in the Pd(II) complex.
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Affiliation(s)
- Sunit Kumar
- Indian Institute of Technology , Powai, Mumbai, 400076, India
| | - Way-Zen Lee
- Instrumentation Center, Department of Chemistry, National Taiwan Normal University , 88 Section 4 Ting-Chow Road, Taipei 11677, Taiwan
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12
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Pokharel K, Ferrence GM, Lash TD. Late transition metal complexes of oxypyriporphyrin and the platinum(II) complex of oxybenziporphyrin. J PORPHYR PHTHALOCYA 2017. [DOI: 10.1142/s1088424617500535] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Even though oxypyriporphyrin, a pyridone-containing porphyrinoid system, has the equivalent coordination core to true porphyrins, its coordination chemistry has been little explored. In this study, the first examples of palladium(II), platinum(II) and silver(II) oxypyriporphyrins have been synthesized. Conventional conditions failed to result in the formation of a platinum(II) complex, but moderate yields were obtained when oxypyriporphyrin was reacted with platinum(II) chloride in refluxing mixtures of DMF and acetic acid containing potassium acetate. The palladium(II) and platinum(II) derivatives were characterized by X-ray crystallography. The structurally analogous carbaporphyrinoid system oxybenziporphyrin was also shown to react with platinum(II) chloride under the same conditions to give a platinum(II) hydroxybenziporphyrin complex. Unlike oxybenziporphyrin, this complex is only weakly diatropic. In the presence of base, the diatropic character was reasserted to afford an aromatic anionic species.
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Affiliation(s)
- Komal Pokharel
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, USA
| | - Gregory M. Ferrence
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, USA
| | - Timothy D. Lash
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, USA
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13
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Darrow WT, Lash TD. An alternative synthesis of benziporphyrins starting from isophthaloyl chloride. J PORPHYR PHTHALOCYA 2017. [DOI: 10.1142/s1088424617500493] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
An alternative route to benziporphyrins has been developed. Reaction of an [Formula: see text]-unsubstituted pyrrole ethyl ester with isophthaloyl chloride in the presence of aluminum chloride afforded a diketone that underwent selective reduction with diborane to give a benzitripyrrane. Cleavage of the ethyl esters with sodium hydroxide in refluxing ethylene glycol, followed by acid catalyzed condensation with a pyrrole dialdehyde and oxidation with DDQ, generated the targeted benziporphyrin product. Spectrophotometric titration of the benziporphyrin with trifluoroacetic acid (TFA) demonstrated the sequential formation of mono- and dicationic species. At lower dilutions, the free base benziporphyrin showed unusually strong [Formula: see text] coupling between two adjacent methyl substituents, indicating that the connecting unit has substantial olefinic characteristics.
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Affiliation(s)
- William T. Darrow
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, U.S.A
| | - Timothy D. Lash
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, U.S.A
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Gao R, AbuSalim DI, Lash TD. Pyreniporphyrins: Porphyrin Analogues That Incorporate a Polycyclic Aromatic Hydrocarbon Subunit within the Macrocyclic Framework. J Org Chem 2017; 82:6680-6688. [DOI: 10.1021/acs.joc.7b00829] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ruixiao Gao
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Deyaa I. AbuSalim
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Timothy D. Lash
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
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15
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Abstract
In 1960, MacDonald and coworkers introduced a new method for porphyrin synthesis that involved the acid-catalyzed condensation of dipyrrylmethane dialdehydes with [Formula: see text],[Formula: see text]-diunsubstituted dipyrrylmethanes or the related dicarboxylic acids, followed by an air oxidation. The key bond forming steps entail electrophilic substitution at two pyrrole units with the aldehyde moieties to generate, following elimination of water, a 5,15-dihydroporphyrin or porphodimethene intermediate. Following addition of sodium acetate, or in later procedures zinc acetate, the dihydroporphyrins readily air oxidize to the fully aromatic porphyrin system. This strategy, which parallels chemistry contemporaneously developed by R. B. Woodward at Harvard for the total synthesis of chlorophyll [Formula: see text], demonstrated that dipyrrylmethanes were sufficiently stable to be utilized as intermediates in porphyrin syntheses and that porphodimethene formation circumvented acidolytic scrambling reactions that might lead to isomeric porphyrin products. This type of chemistry was later adapted by Johnson, Woodward and others to prepare porphyrin-type systems by a “3 + 1” strategy, or expanded porphyrins by “3 + 2” or other combinations of oligopyrrolic precursors. In recent years, the term “MacDonald condensation” has been increasingly used to describe other types of chemistry involving oligopyrrolic intermediates. Following on from a historical review of this area, guidelines for the identification of MacDonald-type reactions are proposed.
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Affiliation(s)
- Timothy D. Lash
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, USA
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Affiliation(s)
- Timothy D. Lash
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
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Szyszko B, Małecki M, Berlicka A, Białek MJ, Białońska A, Kupietz K, Pacholska‐Dudziak E, Latos‐Grażyński L. Incorporation of a Phenanthrene Subunit into a Sapphyrin Framework: Synthesis of Expanded Aceneporphyrinoids. Chemistry 2016; 22:7602-8. [DOI: 10.1002/chem.201600606] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Bartosz Szyszko
- Department of Chemistry University of Wrocław ul.14 F. Joliot-Curie 50-383 Wrocław Poland
| | - Marcin Małecki
- Department of Chemistry University of Wrocław ul.14 F. Joliot-Curie 50-383 Wrocław Poland
| | - Anna Berlicka
- Department of Chemistry University of Wrocław ul.14 F. Joliot-Curie 50-383 Wrocław Poland
| | - Michał J. Białek
- Department of Chemistry University of Wrocław ul.14 F. Joliot-Curie 50-383 Wrocław Poland
| | - Agata Białońska
- Department of Chemistry University of Wrocław ul.14 F. Joliot-Curie 50-383 Wrocław Poland
| | - Kamil Kupietz
- Department of Chemistry University of Wrocław ul.14 F. Joliot-Curie 50-383 Wrocław Poland
| | - Ewa Pacholska‐Dudziak
- Department of Chemistry University of Wrocław ul.14 F. Joliot-Curie 50-383 Wrocław Poland
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Abebayehu A, Park D, Hwang S, Dutta R, Lee CH. Synthesis and spectroscopic behaviour of metal complexes of meso-alkylidenyl carbaporphyrinoids and their expanded analogues. Dalton Trans 2016; 45:3093-101. [DOI: 10.1039/c5dt04566e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Metal complexes of meso-diethyl malonylidene carbaporphyrinoids have been synthesized and fully characterized.
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Affiliation(s)
- Abeje Abebayehu
- Department of Chemistry Kangwon National University
- Chuncheon
- Korea
| | - Dowoo Park
- Department of Chemistry Kangwon National University
- Chuncheon
- Korea
| | - Seonah Hwang
- Department of Chemistry Kangwon National University
- Chuncheon
- Korea
| | - Ranjan Dutta
- Department of Chemistry Kangwon National University
- Chuncheon
- Korea
| | - Chang-Hee Lee
- Department of Chemistry Kangwon National University
- Chuncheon
- Korea
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Lash TD. Benziporphyrins, a unique platform for exploring the aromatic characteristics of porphyrinoid systems. Org Biomol Chem 2015; 13:7846-78. [DOI: 10.1039/c5ob00892a] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Benziporphyrins and related systems exhibit a wide range of properties and may possess nonaromatic, strongly aromatic or even antiaromatic characteristics.
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Fosu SC, Ferrence GM, Lash TD. Synthesis and Metalation of Dimethoxybenziporphyrins, Thiabenziporphyrins, and Dibenziporphyrins. J Org Chem 2014; 79:11061-74. [DOI: 10.1021/jo502063w] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Stacy C. Fosu
- Department
of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Gregory M. Ferrence
- Department
of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Timothy D. Lash
- Department
of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
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AbuSalim DI, Lash TD. Relative stability of benziporphyrin and naphthiporphyrin tautomers and the emergence of macrocyclic diatropicity. Org Biomol Chem 2014; 12:8719-36. [DOI: 10.1039/c4ob01659a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The conformations and relative stabilities of a series of benziporphyrin and naphthiporphyrin tautomers were calculated and the diatropic properties of each of these species were assessed. The results were in good agreement with experimental observations and allow favorable delocalization pathways to be identified.
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AbuSalim DI, Merfeld ML, Lash TD. Dicarbaporphyrinoid Systems. Synthesis of Oxo-adj-dibenziphlorins. J Org Chem 2013; 78:10360-8. [DOI: 10.1021/jo401756q] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Deyaa I. AbuSalim
- Department
of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Michelle L. Merfeld
- Department
of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Timothy D. Lash
- Department
of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
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Lash TD, Toney AM, Castans KM, Ferrence GM. Synthesis of Benziporphyrins and Heterobenziporphyrins and an Assessment of the Diatropic Characteristics of the Protonated Species. J Org Chem 2013; 78:9143-52. [DOI: 10.1021/jo401365p] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Timothy D. Lash
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Ashley M. Toney
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Kylie M. Castans
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Gregory M. Ferrence
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
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Lash TD, Bergman KM. Further Observations on Conformational and Substituent Effects in Acid-Catalyzed “3 + 1” Cyclizations of Tripyrranes with Aromatic Dialdehydes. J Org Chem 2012; 77:9774-83. [DOI: 10.1021/jo301945f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Timothy D. Lash
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160,
United States
| | - Katrina M. Bergman
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160,
United States
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Lash TD, Lammer AD, Idate AS, Colby DA, White K. Preparation of Azulene-Derived Fulvenedialdehydes and Their Application to the Synthesis of Stable adj-Dicarbaporphyrinoids. J Org Chem 2012; 77:2368-81. [DOI: 10.1021/jo2026977] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Timothy D. Lash
- Department
of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Aaron D. Lammer
- Department
of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Aparna S. Idate
- Department
of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Denise A. Colby
- Department
of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Kristen White
- Department
of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
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Lash TD, Pokharel K, Zeller M, Ferrence GM. Iridium(iii) azuliporphyrins. Chem Commun (Camb) 2012; 48:11793-5. [DOI: 10.1039/c2cc37104a] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lash TD, Miyake K, Xu L, Ferrence GM. Synthesis of a Series of Aromatic Benziporphyrins and Heteroanalogues via Tripyrrane-Like Intermediates Derived from Resorcinol and 2-Methylresorcinol. J Org Chem 2011; 76:6295-308. [DOI: 10.1021/jo201098c] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Timothy D. Lash
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Kae Miyake
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Linlin Xu
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Gregory M. Ferrence
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
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Affiliation(s)
- Timothy D. Lash
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Alexandra M. Young
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Jane M. Rasmussen
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
| | - Gregory M. Ferrence
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, United States
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Young AM, Von Ruden AL, Lash TD. Pyrazole analogues of porphyrins and oxophlorins. Org Biomol Chem 2011; 9:6293-305. [DOI: 10.1039/c1ob05603d] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Alexandra M Young
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, USA
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32
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Jain P, Ferrence GM, Lash TD. Preparation of Furan and Thiophene-Derived Fulvene Dialdehydes: Synthesis and Structural Characterization of a 22-Oxa-21-carbaporphyrin and a Related Palladium(II) Organometallic Complex. J Org Chem 2010; 75:6563-73. [DOI: 10.1021/jo101310m] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pankaj Jain
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160
| | - Gregory M. Ferrence
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160
| | - Timothy D. Lash
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160
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33
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Lu BY, Sun GJ, Lin JB, Jiang XK, Zhao X, Li ZT. Hydrogen-bonded benzylidenebenzohydrazide macrocycles and oligomers: testing the robust capacity of an amide chain in promoting the formation of vesicles. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.05.076] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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34
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Ishida M, Naruta Y, Tani F. Copper(ii) and nickel(ii) hexafluorophosphate complexes derived from a monoanionic porphyrin analogue: Solvato- and thermochromism of the Ni complexes by spin-interconversion. Dalton Trans 2010; 39:2651-9. [DOI: 10.1039/b921609j] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Lash TD, Yant VR. Improved syntheses of meso-tetraarylbenziporphyrins and observations of substituent effects on the diatropic characteristics of these formally nonaromatic carbaporphyrinoids. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.09.060] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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37
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Preparation of stable fulvene and difulvene aldehydes from benzaldehydes and an indene-derived enamine: formation of novel indene-fused benzodiazepines and attempted syntheses of di- and tricarbaporphyrinoid systems. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.10.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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Lash TD, Von Ruden AL. Synthesis and Reactivity of N-Methyl and N-Phenyl meso-Unsubstituted N-Confused Porphyrins. J Org Chem 2008; 73:9417-25. [DOI: 10.1021/jo802040q] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Timothy D. Lash
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160
| | - Amber L. Von Ruden
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160
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39
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Lash TD. Recent Advances on the Synthesis and Chemistry of Carbaporphyrins and Related Porphyrinoid Systems. European J Org Chem 2007. [DOI: 10.1002/ejoc.200700478] [Citation(s) in RCA: 124] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Timothy D. Lash
- Department of Chemistry, Illinois State University, Normal, Illinois 61790‐4160, U.S.A., Fax: +1‐309‐438‐5538
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Lash TD, El-Beck JA, Ferrence GM. Syntheses and Reactivity of meso-Unsubstituted Azuliporphyrins Derived from 6-tert-Butyl- and 6-Phenylazulene. J Org Chem 2007; 72:8402-15. [DOI: 10.1021/jo701523s] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Timothy D. Lash
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160
| | - Jessica A. El-Beck
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160
| | - Gregory M. Ferrence
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160
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Lash TD, Szymanski JT, Ferrence GM. Tetraaryldimethoxybenziporphyrins. At the Edge of Carbaporphyrinoid Aromaticity. J Org Chem 2007; 72:6481-92. [PMID: 17655255 DOI: 10.1021/jo070947k] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of eight dimethoxybenziporphyrins were prepared in three steps from 1,3-dimethoxybenzene or 2,6-dimethoxytoluene. Dibromination, followed by lithium-halogen exchange and reaction with benzaldehyde gave dicarbinol intermediates. These reacted with pyrrole and aryl aldehydes in the presence of BF3.Et2O in chloroform, followed by oxidation with DDQ, to give the benziporphyrins in 15-25% yield. These compounds readily gave nickel(II) and palladium(II) organometallic derivatives and could be selectively reduced with sodium borohydride to give unstable benziphlorins. Regioselective oxidation with silver acetate afforded the related 22-acetoxybenziporphyrins in 52-64% yield. The dimethoxybenziporphyrins showed chemical shifts by proton NMR spectroscopy that were consistent with weakly diatropic macrocycles. However, addition of TFA gave dications that showed far more significant shifts that are attributed to the presence of a more substantial diatropic ring current. The internal CH for 11H2(2+) was observed at 3.5 ppm, but this effect was diminished for the 3-methylbenziporphyrins 12H2(2+) where this resonance appears at 4.7 ppm. Even in the absence of the methoxy substituents, the dication derived from tetraphenylbenziporphyrin 8H2(2+) shows an upfield shift for this resonance to 5.5 ppm. The dications of the 22-acetoxybenziporphyrins also show similar effects despite the presence of an internal ester moiety. These results demonstrate that a spectrum of diatropic character can manifest even in highly crowded benziporphyrin derivatives.
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Affiliation(s)
- Timothy D Lash
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, USA.
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Lash TD, Pokharel K, Serling JM, Yant VR, Ferrence GM. Aromatic and Nonaromatic Pyriporphyrins. Org Lett 2007; 9:2863-6. [PMID: 17602489 DOI: 10.1021/ol071052x] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Pyriporphyrins with three different orientations for the pyridine moiety have been prepared using a '3 + 1' strategy. The nonaromatic pyriporphyrins are stable so long as phenyl substituents are present at the meso-positions adjacent to the pyridine ring. An aromatic dihydropyriporphyrin with an external CO2Ph protective group has also been prepared from 2,4-pyridinedicarbaldehyde.
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Affiliation(s)
- Timothy D Lash
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, USA.
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El-Beck JA, Lash TD. Tetraphenyloxybenziporphyrin, a New Organometallic Ligand for Silver(III) and Gold(III). Org Lett 2006; 8:5263-6. [PMID: 17078693 DOI: 10.1021/ol062108a] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[Structure: see text] Reaction of 4-hydroxyisophthalaldehyde with excess phenyl magnesium bromide gave a dicarbinol and this condensed with pyrrole and aromatic aldehydes in the presence of BF3.Et2O to afford, following oxidation with DDQ, novel tetraarylcarbaporphyrinoids in 10-24% yield. Further reaction with silver(I) acetate or gold(III) acetate gave stable organometallic derivatives that retained the aromatic characteristics of the parent macrocycle.
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Affiliation(s)
- Jessica A El-Beck
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, USA
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Stepień M, Latos-Grazyński L. Benziporphyrins: exploring arene chemistry in a macrocyclic environment. Acc Chem Res 2005; 38:88-98. [PMID: 15709728 DOI: 10.1021/ar040189+] [Citation(s) in RCA: 185] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Benziporphyrins are synthetic porphyrin analogues, in which one of the pyrroles is replaced with a benzenoid ring. The arene can be incorporated into the macrocycle in several ways leading to molecules with distinct physical and chemical properties. By appropriately changing the structure of benziporphyrins, it is possible to affect their aromaticity, tautomeric equilibria, and reactivity. Benziporphyrins are versatile ligands, which offer a means to study the metal-arene couple in a macrocyclic environment. The coordination brings the metal ion into the vicinity of the arene fragment leading to activation of C-H bonds or weak interactions, which can be observed spectroscopically.
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Affiliation(s)
- Marcin Stepień
- Department of Chemistry, University of Wrocław, 14 F. Joliot-Curie Street, Wrocław 50383, Poland
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Lash TD, Colby DA, Graham SR, Chaney ST. Synthesis, Spectroscopy, and Reactivity of meso-Unsubstituted Azuliporphyrins and Their Heteroanalogues. Oxidative Ring Contractions to Carba-, Oxacarba-, Thiacarba-, and Selenacarbaporphyrins. J Org Chem 2004; 69:8851-64. [PMID: 15575767 DOI: 10.1021/jo0402531] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This paper reports the first detailed study on meso-unsubstituted azuliporphyrins, an important family of porphyrin-like molecules where one of the usual pyrrole rings has been replaced by an azulene subunit. Although the azulene moiety introduces an element of cross-conjugation, zwitterionic resonance contributors with tropylium and carbaporphyrin substructures give azuliporphyrins diatropic character that falls midway between true carbaporphyrins and nonaromatic benziporphyrins. Protonation affords an aromatic dication where this type of resonance interaction is favored due to the associated charge delocalization. Two different "3 + 1" syntheses of meso-unsubstituted azuliporphyrins have been developed. Acid-catalyzed reaction of readily available tripyrrane dicarboxylic acids with 1,3-azulenedicarbaldehyde, followed by oxidation with DDQ or FeCl(3), affords good yields of azuliporphyrins. Alternatively, azulene reacted with acetoxymethylpyrroles (2 equiv) in refluxing acetic acid/2-propanol to give tripyrrane analogues, and following a deprotection step, condensation with a pyrrole dialdehyde in TFA-CH(2)Cl(2) gave the azuliporphyrin system. The latter approach was also used to prepare 23-thia- and 23-selenaazuliporphyrins. However, reaction of the azulitripyrrane with 2,5-furandicarbaldehyde produced a mixture of three oxacarbaporphyrins in moderate yield. The free base forms of thia- and selenaazuliporphyrins both showed intermediary aromatic character that was considerably enhanced upon protonation. The UV-vis spectra for azuliporphyrins and their heteroanalogues showed four bands between 350 and 500 nm and broad absorptions at higher wavelengths. Addition of TFA gave dications that showed porphyrin-like spectra with Soret bands between 460 and 500 nm. In the presence of pyrrolidine, azuliporphyrins and their heteroanalogues undergo nucleophilic attack on the seven-membered ring to give carbaporphyrin adducts. These systems also undergo oxidative rearrangements under basic conditions with t-BuOOH to give benzocarbaporphyrins. The selenaazuliporphyrin afforded two benzoselenacarbaporphyrins, a previously unknown core-modified carbaporphyrin system. The proton NMR spectra for these compounds showed strong diatropic ring currents with the internal CH resonance upfield above -5 ppm, while the meso-protons resonated downfield near 10 ppm. The UV-vis spectra were also porphyrin-like and gave strong Soret bands at ca. 440 nm.
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Affiliation(s)
- Timothy D Lash
- Department of Chemistry, Illinois State University, Normal, IL 61790-4160, USA.
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Richter DT, Lash TD. Synthesis of Sapphyrins, Heterosapphyrins, and Carbasapphyrins by a “4 + 1” Approach. J Org Chem 2004; 69:8842-50. [PMID: 15575766 DOI: 10.1021/jo040239o] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Sapphyrins are an important group of expanded porphyrins that show valuable anion binding characteristics. In this study, a "4 + 1" route to sapphyrin systems has been developed. Reaction of dialdehydes with a known tetrapyrrole intermediate 11b incorporating a bipyrrolic subunit afforded a wide range of sapphyrin-type products. The best conditions for these reactions involved carrying out the condensation of the dialdehydes with the tetrapyrrole in TFA-dichloromethane, followed by oxidation with dilute aqueous solutions of ferric chloride. A pyrrole dialdehyde reacted under these conditions to give sapphyrin in 50% yield, while furan and thiophene dialdehydes afforded the corresponding oxa- and thiasapphyrins in 66-90% yield. Pyrrole dialdehydes with fused phenanthrene or acenaphthylene rings also reacted with 11b to give the related phenanthro- and acenaphthosapphyrins in excellent yields. As was the case for acenaphthoporphyrins, the acenaphthosapphyrin gave longer wavelength absorptions than the corresponding phenanthrene fused structure, although the differences were not as marked as those seen in the porphyrin series. Reaction of 11b with 1,3-diformylindene gave a benzocarbasapphyrin in 38% yield, while a triformyl cyclopentadiene reacted with the tetrapyrrole to give a carbasapphyrin aldehyde in 7-12% yield. The free base carbasapphyrins were unstable but the monoprotonated hydrochloride salts could easily be isolated and characterized. Carbasapphyrins retain a strong diatropic ring current due to the presence of 22pi electron delocalization pathways. In the presence of trifluoroacetic acid, C-protonated dications are generated. Condensation of 1,3-azulenedicarbaldehyde with 11b gave an azulisapphyrin dihydrochloride salt in 35% yield, and this also showed a strong diatropic ring current. Addition of base gave the unstable free base form, while pyrrolidine formed an unstable adduct that showed an intense Soret band at 480 nm. These results demonstrate that many of the themes observed for modified porphyrins and carbaporphyrins also apply to the sapphyrin series, although in some cases reduced stability hampers these investigations.
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Affiliation(s)
- Daniel T Richter
- Department of Chemistry, Illinois State University, Normal, IL 61790-4160, USA
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Bergman KM, Ferrence GM, Lash TD. Tropiporphyrins, Cycloheptatrienyl Analogues of the Porphyrins: Synthesis, Spectroscopy, Chemistry, and Structural Characterization of a Silver(III) Derivative. J Org Chem 2004; 69:7888-97. [PMID: 15527266 DOI: 10.1021/jo040213x] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Tripyrranes were condensed with 1,3,5-cycloheptriene-1,6-dicarbaldehyde in TFA-CH(2)Cl(2) to give, following oxidation with 0.1% aqueous ferric chloride solutions, a series of tropiporphyrins 9. These cycloheptatrienyl analogues of the porphyrins show strong diatropic ring currents by proton NMR spectroscopy where the internal CH gives a resonance at -7.3 ppm, although the meso-protons are not shifted as far downfield as most aromatic porphyrinoid systems. These data indicate that the seven-membered ring distorts the porphyrinoid macrocycle and decreases the overall diatropicity in tropiporphyrins. Addition of trace amounts of TFA to solutions of 9 affords the corresponding aromatic monocations, and at higher acid concentrations a nonaromatic dication is generated. The dication has undergone C-protonation at one of the meso-bridges and has lost the plane of symmetry present in the parent system. This species shows significant downfield shifts to the cycloheptatrienyl protons, indicating that this unit has taken on tropylium character. Tropiporphyrin 9a underwent a Diels-Alder cycloaddition with dimethyl acetylenedicarboxylate in refluxing xylenes to give modest yields of the related adduct. The Diels-Alder adduct 17 showed an increased diatropic ring current where the internal proton shifted beyond -9 ppm, and this indicates that the [18]annulene substructure has flattened out compared to 9a. Diimide reduction of 9a afforded a dihydrotropiporphyrin that also showed a stronger ring current. Tropiporphyrins 9 were also shown to react with silver(I) acetate in the presence of DBU in refluxing pyridine to give the corresponding silver(III) organometallic derivatives. The meso-protons for these metal complexes give proton NMR chemical shift values similar to those for the parent tropiporphyrins, indicating that the macrocycle is still distorted, but the external olefinic protons are shifted downfield compared to 9. A diphenyl-substituted silver(III) derivative 18b was further characterized by X-ray crystallography. This shows that the cycloheptatriene unit takes on a highly twisted geometry that distorts the overall conformation of the porphyrinoid macrocycle.
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Affiliation(s)
- Katrina M Bergman
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, USA
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50
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Liu D, Ferrence GM, Lash TD. Oxybenziporphyrins, Oxypyriporphyrins, Benzocarbaporphyrins, and Their 23-Oxa and 23-Thia Analogues: Synthesis, Spectroscopic Characterization, Metalation, and Structural Characterization of a Palladium(II) Organometallic Derivative. J Org Chem 2004; 69:6079-93. [PMID: 15373493 DOI: 10.1021/jo040180l] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of nine porphyrin analogues have been synthesized using the "3 + 1" variant on the MacDonald condensation. Tripyrrane-type systems with a centrally unsubstituted pyrrole, furan, or thiophene ring were prepared using conventional methods, and these were condensed with indene-1,3-dicarbaldehyde, 5-formylsalicylaldehyde, or 3-hydroxy-2,6-pyridinedicarbaldehyde in the presence of TFA to generate benzocarba-, oxybenzi-, and oxypyriporphyrins, respectively. The furan-containing analogues proved to be highly basic and could only be isolated as the corresponding hydrochloride salts. All nine analogue systems showed porphyrin-like UV-vis spectra with one or two Soret absorptions near 400 nm and a series of weaker bands at longer wavelengths. These systems also showed large diatropic ring currents by proton NMR spectroscopy that were comparable to true porphyrins. In the presence of trace amounts of TFA, benzocarbaporphyrin 12 formed a monocation, and in 50% TFA a C-protonated dication was generated. The 23-oxacarbaporphyrin 14 gave a monocation in chloroform, although the free base was generated in 5% Et(3)N-chloroform. In 50% TFA-CHCl(3), 14 afforded a mixture of mono- and diprotonated species. Thiacarbaporphyrin 15 also formed a monocation in the presence of TFA, but C-protonation was relatively disfavored for this system. Nonetheless, in the presence of TFA-d, 12, 14, and 15 all showed rapid exchange of the internal NH and CH protons. Carbaporphyrin 12 also showed slow exchange at the meso-positions, but this process was not observed for its heteroanalogues 14 and 15. Protonation studies were also conducted for oxybenziporphyrins and oxypyriporphyrins 16-21. Oxacarbaporphyrin 14 was shown to be a superior organometallic ligand and afforded good yields of the related nickel(II) and palladium(II) derivatives under mild conditions. A low yield of the platinum(II) complex could also be isolated. All three complexes retained their aromatic character, although the Pd(II) derivative appeared to possess a slightly larger diatropic ring current. The palladium(II) complex 27 was further characterized by X-ray crystallography. The macrocyclic core was shown to be highly planar where the dihedral angles of the component pyrrole, furan and indene rings relative to the mean [18]annulene plane were all </=2.1 degrees.
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Affiliation(s)
- Dachun Liu
- Department of Chemistry, Illinois State University, Normal, Illinois 61790-4160, USA
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