101
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An Efficient Ni/Pd Catalyzed Chemoselective Synthesis of 1,3,2‐Benzodiazaborininones from Boronic Acids and Anthranilamides. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900827] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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102
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Li J, Daniliuc CG, Mück‐Lichtenfeld C, Kehr G, Erker G. Multi‐Component Synthesis of Rare 1,3‐Dihydro‐1,3‐azaborinine Derivatives: Application of a Bora‐Nazarov Type Reaction. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201909530] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jun Li
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster Corrensstraβe 40 48149 Münster Germany
| | - Constantin G. Daniliuc
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster Corrensstraβe 40 48149 Münster Germany
| | - Christian Mück‐Lichtenfeld
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster Corrensstraβe 40 48149 Münster Germany
| | - Gerald Kehr
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster Corrensstraβe 40 48149 Münster Germany
| | - Gerhard Erker
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität Münster Corrensstraβe 40 48149 Münster Germany
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103
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Saito H, Yorimitsu H. Ring-expanding and Ring-opening Transformations of Benzofurans and Indoles with Introducing Heteroatoms. CHEM LETT 2019. [DOI: 10.1246/cl.190393] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Hayate Saito
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Hideki Yorimitsu
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
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104
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Brown PA, Martin CD, Shuford KL. Aromaticity of unsaturated BEC 4 heterocycles (E = N, P, As, Sb, O, S, Se, Te). Phys Chem Chem Phys 2019; 21:18458-18466. [PMID: 31250870 DOI: 10.1039/c9cp02387a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A compendium of pnictogen and chalcogen substituted boron heterocycles were assessed for their aromatic character by first principles density functional theory. Group-15 and Group-16 elements were placed at the ortho-, meta-, and para-positions of six-membered rings relative to boron to assess their impact on the aromaticity of the unsaturated heterocycles. Aromaticity was analyzed by a multidimensional approach using nuclear independent chemical shifts, gauge-including magnetically induced current, as well as natural bond orbital and natural resonance theory analyses. Based on these methods, we observe a general decline of aromaticity in heavier pnictaborines while the chalcogen analogues maintain relatively strong aromatic character. These general trends result from complementary π-π* natural bond order interactions that sustain resonance within the ring of each heterocycle establishing a pattern of cyclic delocalization. Consequently, natural resonance theory displays strong resonance, which is corroborated with the signed modulus of ring current, toroidal vortices of current maps, and elevated average induced current throughout the ring. The 1,3-configurations for pnictaborines and chalcogenaborines are generally more aromatic compared to the 1,2- and 1,4-isomers, which contain π-holes that limit diatropism within the heterocycles. However, an energetic trend favors the 1,2-heterocycles in both groups, with a few exceptions driven in large-part by π-donation of the lone pair on the heteroatom to the pz orbital on the adjacent boron resulting in stabilization. The importance of planarity for high aromaticity is demonstrated, especially in the pnictaborine isomers where pyramidalization at the pnictogen is favored, while bond regularity seems a less important criterion.
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Affiliation(s)
- Paul A Brown
- Department of Chemistry & Biochemistry, Baylor University, One Bear Place #97348, Waco, TX 76798-7348, USA.
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105
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Kaehler T, Bolte M, Lerner H, Wagner M. Introducing Perylene as a New Member to the Azaborine Family. Angew Chem Int Ed Engl 2019; 58:11379-11384. [DOI: 10.1002/anie.201905823] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 05/24/2019] [Indexed: 11/12/2022]
Affiliation(s)
- Tanja Kaehler
- Institut für Anorganische ChemieGoethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
| | - Michael Bolte
- Institut für Anorganische ChemieGoethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
| | - Hans‐Wolfram Lerner
- Institut für Anorganische ChemieGoethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
| | - Matthias Wagner
- Institut für Anorganische ChemieGoethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
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106
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Liu Y, Liu SY. Exploring the strength of a hydrogen bond as a function of steric environment using 1,2-azaborine ligands and engineered T4 lysozyme receptors. Org Biomol Chem 2019; 17:7002-7006. [PMID: 31309207 DOI: 10.1039/c9ob01008d] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A congeneric series of 1,2-azaborine ligands was used to study the relationship between the steric demand of the ligand and hydrogen bonding strength in the context of ligand-protein binding using engineered T4 lysozymes as the model biomacromolecules. The hydrogen bonding strength values were extracted from experimentally accessible binding free energies using the Double Mutant Cycle analysis. With the increasing steric demand, the NH…102Q hydrogen bonding interaction is weakened; however, this weakening of the hydrogen bonding interaction occurs in discrete steps rather than in an incremental fashion.
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Affiliation(s)
- Yao Liu
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, USA.
| | - Shih-Yuan Liu
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, USA.
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107
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Baranac-Stojanović M. A DFT Study of the Modulation of the Antiaromatic and Open-Shell Character of Dibenzo[a,f]pentalene by Employing Three Strategies: Additional Benzoannulation, BN/CC Isosterism, and Substitution. Chemistry 2019; 25:9747-9757. [PMID: 31107568 DOI: 10.1002/chem.201901845] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2019] [Revised: 05/17/2019] [Indexed: 11/07/2022]
Abstract
Dibenzo[a,f]pentalene ([a,f]DBP) is a highly antiaromatic molecule having appreciable open-shell singlet character in its ground state. In this work, DFT calculations at the B3LYP/6-311+G(d,p) level of theory were performed to explore the efficiency of three strategies, that is, BN/CC isosterism, substitution, and (di)benzoannulation of [a,f]DBP, in controlling its electronic state and (anti)aromaticity. To evaluate the type and extent of the latter, the harmonic oscillator model of aromaticity (HOMA) and aromatic fluctuation (FLU) indices were used, along with the nucleus-independent chemical shift NICS-XY-scan procedure. The results suggest that all three strategies could be employed to produce either the closed-shell system or open-shell species, which may be in the singlet or triplet ground state. Triplet states have been characterized as aromatic, which is in accordance with Baird's rule. All the singlet states were found to have weaker global paratropicity than [a,f]DBP. Additional (di)benzo fusion adds local aromatic subunit(s) and mainly retains the topology of the paratropic ring currents of the basic molecule. The substitution of two carbon atoms by the isoelectronic BN pair, or the introduction of substituents, results either in the same type and very similar topology of ring currents as in the parent compound, or leads to (anti)aromatic and nonaromatic subunits. The triplet states of all the examined compounds are also discussed.
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108
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Kaehler T, Bolte M, Lerner H, Wagner M. Introducing Perylene as a New Member to the Azaborine Family. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201905823] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Tanja Kaehler
- Institut für Anorganische ChemieGoethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
| | - Michael Bolte
- Institut für Anorganische ChemieGoethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
| | - Hans‐Wolfram Lerner
- Institut für Anorganische ChemieGoethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
| | - Matthias Wagner
- Institut für Anorganische ChemieGoethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
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109
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Ishikawa Y, Suzuki K, Yamashita M. 9-Aza-10-boraanthracene Stabilized by Coordination of an N-Heterocyclic Carbene and Its Methylated Cation: Synthesis, Structure, and Electronic Properties. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00310] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yutaro Ishikawa
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603 Japan
| | - Katsunori Suzuki
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603 Japan
| | - Makoto Yamashita
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603 Japan
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110
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Lin H, McConnell CR, Jilus B, Liu SY, Jäkle F. Changing up BN-Polystyrene: Effect of Substitution Pattern on the Free-Radical Polymerization and Polymer Properties. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b00466] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Huina Lin
- Department of Chemistry, Rutgers University—Newark, Newark, New Jersey 07102, United States
| | - Cameron R. McConnell
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02135, United States
| | - Berothy Jilus
- Department of Chemistry, Rutgers University—Newark, Newark, New Jersey 07102, United States
| | - Shih-Yuan Liu
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02135, United States
| | - Frieder Jäkle
- Department of Chemistry, Rutgers University—Newark, Newark, New Jersey 07102, United States
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111
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Abengózar A, Sucunza D, García-García P, Vaquero JJ. Remarkable effect of alkynyl substituents on the fluorescence properties of a BN-phenanthrene. Beilstein J Org Chem 2019; 15:1257-1261. [PMID: 31293672 PMCID: PMC6604742 DOI: 10.3762/bjoc.15.122] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2019] [Accepted: 05/21/2019] [Indexed: 01/18/2023] Open
Abstract
A series of BN-phenanthrenes with substituents of a diverse nature have been synthesized by palladium-catalyzed cross-coupling reactions of a common chloro-substituted precursor, which was made from readily available materials in only four steps. Evaluation of the photophysical properties of the prepared compounds unveiled an impressive effect of the presence of alkynyl substituents on the fluorescence quantum yield, which improved from 0.01 in the parent compound to up to 0.65 in derivatives containing a triple bond.
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Affiliation(s)
- Alberto Abengózar
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química “Andrés M. del Río” (IQAR), Universidad de Alcalá, 28871-Alcalá de Henares, Madrid, Spain
| | - David Sucunza
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química “Andrés M. del Río” (IQAR), Universidad de Alcalá, 28871-Alcalá de Henares, Madrid, Spain
| | - Patricia García-García
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química “Andrés M. del Río” (IQAR), Universidad de Alcalá, 28871-Alcalá de Henares, Madrid, Spain
| | - Juan J Vaquero
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química “Andrés M. del Río” (IQAR), Universidad de Alcalá, 28871-Alcalá de Henares, Madrid, Spain
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112
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McConnell CR, Haeffner F, Baggett AW, Liu SY. 1,2-Azaborine's Distinct Electronic Structure Unlocks Two New Regioisomeric Building Blocks via Resolution Chemistry. J Am Chem Soc 2019; 141:9072-9078. [PMID: 31082254 PMCID: PMC6609151 DOI: 10.1021/jacs.9b03611] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Two new 1,2-azaborine building blocks that enable the broad diversification of previously not readily accessible C4 and C5 ring positions of the 1,2-azaborine heterocycle are developed. 1,2-Azaborine's distinct electronic structure allowed the resolution of a mixture of C4- and C5-borylated 1,2-azaborines. The connection between the electronic structure of C4 and C5 positions of 1,2-azaborine and their distinct reactivity patterns is revealed by a combination of reactivity studies and kinetic measurements that are supported by DFT calculations. Specifically, we show that oxidation by N-methylmorpholine N-oxide (NMO) is selective for the C4-borylated 1,2-azaborine, and the Ir-catalyzed deborylation is selective for the C5-borylated 1,2-azaborine via kinetically controlled processes. On the other hand, ligand exchange with diethanolamine takes place selectively with the C4-borylated isomer via a thermodynamically controlled process. These results represent the first examples for chemically distinguishing a mixture of two aryl mono-Bpin-substituted isomers.
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Affiliation(s)
- Cameron R. McConnell
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Fredrik Haeffner
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | | | - Shih-Yuan Liu
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, United States
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113
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Abengózar A, Sucunza D, García-García P, Sampedro D, Pérez-Redondo A, Vaquero JJ. A New Member of the BN-Phenanthrene Family: Understanding the Role of the B-N Bond Position. J Org Chem 2019; 84:7113-7122. [PMID: 31079459 DOI: 10.1021/acs.joc.9b00800] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
3,4-Dihydro-4-aza-3-boraphenanthrene, which shows the highest fluorescence quantum yield of all nonsubstituted BN-phenanthrenes reported to date (ϕF = 0.61), has been synthesized in only three steps (76% overall yield) from easily accessible 1-bromo-2-vinylnaphthalene, along with several substituted derivatives. The reactivity of these previously unknown BN-aromatic compounds toward organolithium compounds and bromine has been studied. This latter reaction affords bromo-substituted compounds that are suitable for further functionalization via Suzuki and Sonogashira couplings, with complete regioselectivity. The optical properties and excited state deactivation mechanisms of selected compounds were studied using computational methods.
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Affiliation(s)
- Alberto Abengózar
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR) , Universidad de Alcalá , 28805 Alcalá de Henares , Spain
| | - David Sucunza
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR) , Universidad de Alcalá , 28805 Alcalá de Henares , Spain
| | - Patricia García-García
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR) , Universidad de Alcalá , 28805 Alcalá de Henares , Spain
| | - Diego Sampedro
- Departamento de Química, Centro de Investigación en Síntesis Química (CISQ) , Universidad de La Rioja , Madre de Dios 53 , 26006 Logroño , Spain
| | - Adrián Pérez-Redondo
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR) , Universidad de Alcalá , 28805 Alcalá de Henares , Spain
| | - Juan J Vaquero
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR) , Universidad de Alcalá , 28805 Alcalá de Henares , Spain
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114
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Boknevitz K, Italia JS, Li B, Chatterjee A, Liu SY. Synthesis and characterization of an unnatural boron and nitrogen-containing tryptophan analogue and its incorporation into proteins. Chem Sci 2019; 10:4994-4998. [PMID: 31183048 PMCID: PMC6524624 DOI: 10.1039/c8sc05167d] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 04/15/2019] [Indexed: 12/12/2022] Open
Abstract
A boron and nitrogen containing unnatural analogue of tryptophan is synthesized and incorporated into proteins.
A boron and nitrogen containing unnatural analogue of tryptophan is synthesized through the functionalization of BN-indole. The spectroscopic properties of BN-tryptophan are reported with respect to the natural tryptophan, and the incorporation of BN-tryptophan into proteins expressed in E. coli using selective pressure incorporation is described. This work shows that a cellular system can recognize the unnatural, BN-containing tryptophan. More importantly, it presents the first example of an azaborine containing amino acid being incorporated into proteins.
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Affiliation(s)
- Katherine Boknevitz
- Department of Chemistry , Boston College , Chestnut Hill , MA 02467 , USA . ;
| | - James S Italia
- Department of Chemistry , Boston College , Chestnut Hill , MA 02467 , USA . ;
| | - Bo Li
- Department of Chemistry , Boston College , Chestnut Hill , MA 02467 , USA . ;
| | - Abhishek Chatterjee
- Department of Chemistry , Boston College , Chestnut Hill , MA 02467 , USA . ;
| | - Shih-Yuan Liu
- Department of Chemistry , Boston College , Chestnut Hill , MA 02467 , USA . ;
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115
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Tsuchiya S, Saito H, Nogi K, Yorimitsu H. Aromatic Metamorphosis of Indoles into 1,2-Benzazaborins. Org Lett 2019; 21:3855-3860. [PMID: 31063386 DOI: 10.1021/acs.orglett.9b01353] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Among the plethora of aromatic compounds, indoles represent a privileged class of substructures that is ubiquitous in natural products and pharmaceuticals. While numerous exocyclic functionalizations of indoles have provided access to a variety of useful derivatives, endocyclic transformations involving the cleavage of the C2-N bond remain challenging due to the high aromaticity and strength of this bond in indoles. Herein, we report the "aromatic metamorphosis" of indoles into 1,2-benzazaborins via the insertion of boron into the C2-N bond. This endocyclic insertion consists of a reductive ring-opening using lithium metal and a subsequent trapping of the resulting dianionic species with organoboronic esters. Considering that 1,2-azaborins have attracted increasing academic and industrial attention as BN isosteres of benzene, the counterintuitive aromatic metamorphosis presented herein can feasibly be expected to substantially advance the promising chemistry of 1,2-azaborins.
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Affiliation(s)
- Shun Tsuchiya
- Department of Chemistry, Graduate School of Science , Kyoto University , Sakyo-ku, Kyoto 606-8502 , Japan
| | - Hayate Saito
- Department of Chemistry, Graduate School of Science , Kyoto University , Sakyo-ku, Kyoto 606-8502 , Japan
| | - Keisuke Nogi
- Department of Chemistry, Graduate School of Science , Kyoto University , Sakyo-ku, Kyoto 606-8502 , Japan
| | - Hideki Yorimitsu
- Department of Chemistry, Graduate School of Science , Kyoto University , Sakyo-ku, Kyoto 606-8502 , Japan
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116
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Zhang C, Zhang L, Sun C, Sun W, Liu X. BN-Phenanthrenes: Synthesis, Reactivity, and Optical Properties. Org Lett 2019; 21:3476-3480. [DOI: 10.1021/acs.orglett.9b00530] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Chen Zhang
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, People’s Republic of China
| | - Lei Zhang
- School of Science, Tianjin Chengjian University, Tianjin 300384, People’s Republic of China
| | - Chao Sun
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, People’s Republic of China
| | - Wenfang Sun
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, People’s Republic of China
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58108-6050, United States
| | - Xuguang Liu
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, People’s Republic of China
- Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, People’s Republic of China
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117
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Abengózar A, García-García P, Sucunza D, Sampedro D, Pérez-Redondo A, Vaquero JJ. Synthesis, Functionalization, and Optical Properties of 1,2-Dihydro-1-aza-2-boraphenanthrene and Several Highly Fluorescent Derivatives. Org Lett 2019; 21:2550-2554. [DOI: 10.1021/acs.orglett.9b00448] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alberto Abengózar
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química “Andrés M. del Río” (IQAR), Universidad de Alcalá, 28805 Alcalá de Henares, Spain
| | - Patricia García-García
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química “Andrés M. del Río” (IQAR), Universidad de Alcalá, 28805 Alcalá de Henares, Spain
| | - David Sucunza
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química “Andrés M. del Río” (IQAR), Universidad de Alcalá, 28805 Alcalá de Henares, Spain
| | - Diego Sampedro
- Departamento de Química, Centro de Investigación en Síntesis Química (CISQ), Universidad de La Rioja, Madre de Dios 53, 26006 Logroño, Spain
| | - Adrián Pérez-Redondo
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química “Andrés M. del Río” (IQAR), Universidad de Alcalá, 28805 Alcalá de Henares, Spain
| | - Juan J. Vaquero
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química “Andrés M. del Río” (IQAR), Universidad de Alcalá, 28805 Alcalá de Henares, Spain
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118
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Lu Z, Quanz H, Ruhl J, Albrecht G, Logemann C, Schlettwein D, Schreiner PR, Wegner HA. Control of Excited-State Conformations in B,N-Acenes. Angew Chem Int Ed Engl 2019; 58:4259-4263. [PMID: 30657239 DOI: 10.1002/anie.201814104] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Indexed: 11/07/2022]
Abstract
We present a new concept to control the conformations of molecules in the excited state through harvesting negative hyperconjugation. The strategy was realized with the 2,3,1,4-benzodiazadiborinane scaffold, which was prepared by a new synthetic procedure. Photochemical studies identified dual light emission, which was assigned to well-defined conformers. The emission at longer wavelength can be switched off by restricting the rotational degrees of freedom in the solid state as well as by controlling the energy levels of the excited states through adjusting the solvent polarity.
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Affiliation(s)
- Zhenpin Lu
- Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392, Giessen, Germany.,Center for Materials Research (LaMa), Justus Liebig University, Heinrich-Buff-Ring 16, 35392, Giessen, Germany
| | - Henrik Quanz
- Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392, Giessen, Germany.,Center for Materials Research (LaMa), Justus Liebig University, Heinrich-Buff-Ring 16, 35392, Giessen, Germany
| | - Julia Ruhl
- Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392, Giessen, Germany.,Center for Materials Research (LaMa), Justus Liebig University, Heinrich-Buff-Ring 16, 35392, Giessen, Germany
| | - Georg Albrecht
- Institute of Applied Physics and Center for Materials Research (LaMa), Justus Liebig University, Heinrich-Buff-Ring 16, 35392, Giessen, Germany
| | - Christian Logemann
- Institute of Inorganic Chemistry, Department of Chemistry, University of Cologne, Greinstr. 6, 50939, Köln, Germany
| | - Derck Schlettwein
- Institute of Applied Physics and Center for Materials Research (LaMa), Justus Liebig University, Heinrich-Buff-Ring 16, 35392, Giessen, Germany
| | - Peter R Schreiner
- Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392, Giessen, Germany.,Center for Materials Research (LaMa), Justus Liebig University, Heinrich-Buff-Ring 16, 35392, Giessen, Germany
| | - Hermann A Wegner
- Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392, Giessen, Germany.,Center for Materials Research (LaMa), Justus Liebig University, Heinrich-Buff-Ring 16, 35392, Giessen, Germany
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119
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Lu Z, Quanz H, Ruhl J, Albrecht G, Logemann C, Schlettwein D, Schreiner PR, Wegner HA. Control of Excited‐State Conformations in B,N‐Acenes. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201814104] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Zhenpin Lu
- Institute of Organic ChemistryJustus Liebig University Heinrich-Buff-Ring 17 35392 Giessen Germany
- Center for Materials Research (LaMa)Justus Liebig University Heinrich-Buff-Ring 16 35392 Giessen Germany
| | - Henrik Quanz
- Institute of Organic ChemistryJustus Liebig University Heinrich-Buff-Ring 17 35392 Giessen Germany
- Center for Materials Research (LaMa)Justus Liebig University Heinrich-Buff-Ring 16 35392 Giessen Germany
| | - Julia Ruhl
- Institute of Organic ChemistryJustus Liebig University Heinrich-Buff-Ring 17 35392 Giessen Germany
- Center for Materials Research (LaMa)Justus Liebig University Heinrich-Buff-Ring 16 35392 Giessen Germany
| | - Georg Albrecht
- Institute of Applied Physics and Center for Materials Research (LaMa)Justus Liebig University Heinrich-Buff-Ring 16 35392 Giessen Germany
| | - Christian Logemann
- Institute of Inorganic ChemistryDepartment of ChemistryUniversity of Cologne Greinstr. 6 50939 Köln Germany
| | - Derck Schlettwein
- Institute of Applied Physics and Center for Materials Research (LaMa)Justus Liebig University Heinrich-Buff-Ring 16 35392 Giessen Germany
| | - Peter R. Schreiner
- Institute of Organic ChemistryJustus Liebig University Heinrich-Buff-Ring 17 35392 Giessen Germany
- Center for Materials Research (LaMa)Justus Liebig University Heinrich-Buff-Ring 16 35392 Giessen Germany
| | - Hermann A. Wegner
- Institute of Organic ChemistryJustus Liebig University Heinrich-Buff-Ring 17 35392 Giessen Germany
- Center for Materials Research (LaMa)Justus Liebig University Heinrich-Buff-Ring 16 35392 Giessen Germany
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120
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Ishikawa Y, Suzuki K, Hayashi K, Nema SY, Yamashita M. Chlorine-Substituted 9,10-Dihydro-9-aza-10-boraanthracene as a Precursor for Various Boron- and Nitrogen-Containing π-Conjugated Compounds. Org Lett 2019; 21:1722-1725. [PMID: 30838862 DOI: 10.1021/acs.orglett.9b00278] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Chlorine-substituted 9,10-dihydro-9-aza-10-boraanthracene was synthesized. Derivatization of this compound by taking advantage of the transformable B-Cl moiety gave 9,10-dihydro-9-aza-10-boraanthracene derivatives with various aryl substituents. In addition, further functionalization on NH groups by alkylation and Buchwald-Hartwig amination was demonstrated. Photophysical properties of the resulting 9,10-dihydro-9-aza-10-boraanthracene derivatives were also discussed.
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Affiliation(s)
- Yutaro Ishikawa
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering , Nagoya University , Furo-cho , Chikusa-ku , Nagoya 464-8603 , Japan
| | - Katsunori Suzuki
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering , Nagoya University , Furo-cho , Chikusa-ku , Nagoya 464-8603 , Japan
| | - Kohei Hayashi
- Department of Applied Chemistry , Faculty of Science and Engineering, Chuo University , 1-13-27 Kasuga , Bunkyo-ku , Tokyo 112-8551 , Japan
| | - Shin-Ya Nema
- Department of Applied Chemistry , Faculty of Science and Engineering, Chuo University , 1-13-27 Kasuga , Bunkyo-ku , Tokyo 112-8551 , Japan
| | - Makoto Yamashita
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering , Nagoya University , Furo-cho , Chikusa-ku , Nagoya 464-8603 , Japan
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121
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Opie CR, Noda H, Shibasaki M, Kumagai N. All Non-Carbon B 3 NO 2 Exotic Heterocycles: Synthesis, Dynamics, and Catalysis. Chemistry 2019; 25:4648-4653. [PMID: 30770614 DOI: 10.1002/chem.201900715] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Indexed: 02/03/2023]
Abstract
The B3 NO2 six-membered heterocycle (1,3-dioxa-5-aza-2,4,6-triborinane=DATB), comprising three different non-carbon period 2 elements, has been recently demonstrated to be a powerful catalyst for dehydrative condensation of carboxylic acids and amines. The tedious synthesis of DATB, however, has significantly diminished its utility as a catalyst, and thus the inherent chemical properties of the ring system have remained virtually unexplored. Here, a general and facile synthetic strategy that harnesses a pyrimidine-containing scaffold for the reliable installation of boron atoms is disclosed, giving rise to a series of Pym-DATBs from inexpensive materials in a modular fashion. The identification of a soluble Pym-DATB derivative allowed for the investigation of the dynamic nature of the B3 NO2 ring system, revealing differential ring-closing and -opening behaviors depending on the medium. Readily accessible Pym-DATBs proved their utility as efficient catalysts for dehydrative amidation with broad substrate scope and functional-group tolerance, offering a general and practical catalytic alternative to reagent-driven amidation.
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Affiliation(s)
- Christopher R Opie
- Institute of Microbial Chemistry (BIKAKEN), 3-14-23 Kamiosaki, Shinagawa-ku, Tokyo, 141-0021, Japan
| | - Hidetoshi Noda
- Institute of Microbial Chemistry (BIKAKEN), 3-14-23 Kamiosaki, Shinagawa-ku, Tokyo, 141-0021, Japan
| | - Masakatsu Shibasaki
- Institute of Microbial Chemistry (BIKAKEN), 3-14-23 Kamiosaki, Shinagawa-ku, Tokyo, 141-0021, Japan
| | - Naoya Kumagai
- Institute of Microbial Chemistry (BIKAKEN), 3-14-23 Kamiosaki, Shinagawa-ku, Tokyo, 141-0021, Japan
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122
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Helten H. Doping the Backbone of π‐Conjugated Polymers with Tricoordinate Boron: Synthetic Strategies and Emerging Applications. Chem Asian J 2019; 14:919-935. [DOI: 10.1002/asia.201900016] [Citation(s) in RCA: 49] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2019] [Indexed: 11/08/2022]
Affiliation(s)
- Holger Helten
- Institute of Inorganic ChemistryRWTH Aachen University Landoltweg 1 52056 Aachen Germany
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123
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Ishibashi JSA, Darrigan C, Chrostowska A, Li B, Liu SY. A BN anthracene mimics the electronic structure of more highly conjugated systems. Dalton Trans 2019; 48:2807-2812. [PMID: 30734032 DOI: 10.1039/c9dt00481e] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
9a,9-BN anthracene was synthesized using a simple three-step sequence involving intramolecular electrophilic borylation of 2-benzylpyridines. The same procedure can be applied to yield a number of substituted 9a,9-BN anthracenes. Spectroscopic characterization of the parental compound (UV-photoelectron spectroscopy, UV-vis absorption/emission) shows an electronic structure more similar to that of a larger conjugated system rather than anthracene, the direct all-carbon analogue.
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Affiliation(s)
- Jacob S A Ishibashi
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, USA.
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124
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Meier M, Ji L, Nitsch J, Krummenacher I, Deißenberger A, Auerhammer D, Schäfer M, Marder TB, Braunschweig H. Preparation and Characterization of a π-Conjugated Donor-Acceptor System Containing the Strongly Electron-Accepting Tetraphenylborolyl Unit. Chemistry 2019; 25:4707-4712. [PMID: 30786077 DOI: 10.1002/chem.201805454] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 01/11/2019] [Indexed: 11/05/2022]
Abstract
A novel thiophene-bridged donor-acceptor system was synthesized with a carbazole as donor and a borole as acceptor unit. The borole group was successfully installed via the tin-boron exchange reaction of 1,1-dimethyl-2,3,4,5-tetraphenylstannole with 9-(5-(dibromoboryl)thiophen-2-yl)carbazole. The effect of the borole on the optoelectronic properties of the donor-acceptor system was explored by spectroscopic (UV/Vis and fluorescence spectroscopy), electrochemical (cyclic voltammetry) and theoretical (TD-DFT) methods as well as by modifying its structure. The corresponding donor-acceptor compound bearing the widely employed dimesitylboryl acceptor group was also synthesized for comparison.
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Affiliation(s)
- Michael Meier
- Institute of Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg (Germany), and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Lei Ji
- Institute of Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg (Germany), and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Jörn Nitsch
- Institute of Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg (Germany), and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Ivo Krummenacher
- Institute of Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg (Germany), and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Andrea Deißenberger
- Institute of Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg (Germany), and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Dominic Auerhammer
- Institute of Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg (Germany), and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Marius Schäfer
- Institute of Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg (Germany), and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Todd B Marder
- Institute of Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg (Germany), and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Holger Braunschweig
- Institute of Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg (Germany), and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
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125
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Expanding the functional group tolerance of cross-coupling in 1,2-dihydro-1,2-azaborines: Installation of alkyl, alkenyl, aryl, and heteroaryl substituents while maintaining a B−H bond. Tetrahedron 2019; 75:580-583. [DOI: 10.1016/j.tet.2018.12.039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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126
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Goettel JT, Braunschweig H. Recent advances in boron-centered ligands and their transition metal complexes. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2018.09.013] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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127
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Sugahara T, Guo JD, Hashizume D, Sasamori T, Tokitoh N. Reversible Isomerizations between 1,4-Digermabenzenes and 1,4-Digerma-Dewar-benzenes: Air-Stable Activators for Small Molecules. J Am Chem Soc 2019; 141:2263-2267. [DOI: 10.1021/jacs.9b00129] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Tomohiro Sugahara
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Jing-Dong Guo
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
- Integrated Research Consortium on Chemical Sciences, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Daisuke Hashizume
- RIKEN Center for Emergent Matter Science (CEMS), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Takahiro Sasamori
- Graduate School of Natural Sciences, Nagoya City University, Yamanohata 1, Mizuho-cho, Mizuho-ku, Nagoya, Aichi 467-8501, Japan
| | - Norihiro Tokitoh
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
- Integrated Research Consortium on Chemical Sciences, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
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128
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Baker JJ, Al Furaiji KHM, Liyanage OT, Wilson DJD, Dutton JL, Martin CD. Diverse Reactivity of Dienes with Pentaphenylborole and 1-Phenyl-2,3,4,5-Tetramethylborole Dimer. Chemistry 2019; 25:1581-1587. [PMID: 30457687 DOI: 10.1002/chem.201805151] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 11/13/2018] [Indexed: 12/14/2022]
Abstract
The reactions of a monomeric borole and a dimeric borole with 2,3-dimethyl-1,3-butadiene and 1,3-cyclohexadiene were investigated. The monomeric borole reacted at ambient temperature whereas heat was required to crack the dimer to form the monomer and induce reactivity. 2,3-Dimethyl-1,3-butadiene reacts to give diverse products resulting from a cycloaddition process with the B-C moiety of the boroles acting as a dienophile, followed by rearrangements to furnish bicyclic species. For 1,3-cyclohexadiene, a [4+2] process is observed in which 1,3-cyclohexadiene serves as the dienophile and the boroles as the diene partner. The experimental results are corroborated with mechanistic theoretical calculations that indicate boroles can serve as either a diene or dienophile in cycloaddition reactions with dienes.
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Affiliation(s)
- J J Baker
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, TX, 76798, USA
| | - Khadilah H M Al Furaiji
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, 3086, Australia
| | - O Tara Liyanage
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, TX, 76798, USA
| | - David J D Wilson
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, 3086, Australia
| | - Jason L Dutton
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, 3086, Australia
| | - Caleb D Martin
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place 97348, Waco, TX, 76798, USA
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129
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van de Wouw HL, Klausen RS. BN Polystyrenes: Emerging Optical Materials and Versatile Intermediates. J Org Chem 2019; 84:1117-1125. [PMID: 30620583 DOI: 10.1021/acs.joc.8b02921] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
BN polystyrenes are an emerging class of polyolefins functionalized with aromatic side chains in which at least one CC bond is replaced with a BN bond. This class of structures exhibits unusual photophysical properties relative to organic polymers. BN polystyrenes serve as intermediates in the preparation of functional polymers, including stereoregular polar polyolefins. The consequences of BN for CC bond substitution on reactivity and properties are highlighted.
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Affiliation(s)
- Heidi L van de Wouw
- Department of Chemistry , Johns Hopkins University , 3400 North Charles Street , Baltimore , Maryland 21218 , United States
| | - Rebekka S Klausen
- Department of Chemistry , Johns Hopkins University , 3400 North Charles Street , Baltimore , Maryland 21218 , United States
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130
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Yeung K, Talbot FJT, Howell GP, Pulis AP, Procter DJ. Copper-Catalyzed Borylative Multicomponent Synthesis of Quaternary α-Amino Esters. ACS Catal 2019. [DOI: 10.1021/acscatal.8b04563] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Kay Yeung
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Fabien J. T. Talbot
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - Gareth P. Howell
- Pharmaceutical Technology and Development, AstraZeneca, Silk Road Business Park, Macclesfield SK10 2NA, United Kingdom
| | - Alexander P. Pulis
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
| | - David J. Procter
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom
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131
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Lindl F, Lin S, Krummenacher I, Lenczyk C, Stoy A, Müller M, Lin Z, Braunschweig H. 1,2,3-Diazaborinin: ein BN-Analogon des Pyridins durch Borol-Ringerweiterung mit einem organischen Azid. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201811601] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Felix Lindl
- Institut für Anorganische Chemie; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
- Institut für Nachhaltige Chemie & Katalyse mit Bor; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
| | - Shujuan Lin
- Departement Chemie; Universität für Wissenschaft und Technologie Hongkong; Clear Water Bay Kowloon, Hongkong China
| | - Ivo Krummenacher
- Institut für Anorganische Chemie; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
- Institut für Nachhaltige Chemie & Katalyse mit Bor; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
| | - Carsten Lenczyk
- Institut für Anorganische Chemie; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
- Institut für Nachhaltige Chemie & Katalyse mit Bor; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
| | - Andreas Stoy
- Institut für Anorganische Chemie; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
- Institut für Nachhaltige Chemie & Katalyse mit Bor; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
| | - Marcel Müller
- Institut für Anorganische Chemie; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
- Institut für Nachhaltige Chemie & Katalyse mit Bor; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
| | - Zhenyang Lin
- Departement Chemie; Universität für Wissenschaft und Technologie Hongkong; Clear Water Bay Kowloon, Hongkong China
| | - Holger Braunschweig
- Institut für Anorganische Chemie; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
- Institut für Nachhaltige Chemie & Katalyse mit Bor; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
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132
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Abstract
Most of the chemical and biological processes involving the fixation and transformation of small molecules have long been exclusive for metal complexes. Meanwhile, the last decades have seen a significant advance in main group chemistry that mimics transition-metal complexes, among which various boron-containing systems have been successful in mediating the small molecule activation. In this review, we focus on boron-containing heterocycles enabling the activation of σ- and π-bonds in small molecules, in conjunction with the proposed mechanisms.
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Affiliation(s)
- Yuanting Su
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Nanyang Link 21, Singapore 637371, Singapore.
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133
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Baranac-Stojanović M, Stojanović M. Does aromaticity account for an enhanced thermodynamic stability? The case of monosubstituted azaborines and the stereoelectronic chameleonism of the NH 2 group. Phys Chem Chem Phys 2019; 21:9465-9476. [PMID: 31016295 DOI: 10.1039/c9cp01011d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This work was initiated by the increasing interest in BN/CC isosterism and by the long-lasting interest in the concepts of aromaticity and substituent effects. We have theoretically examined the aromaticity and stability of monosubstituted BN isosters of benzene, the three isomeric azaborines. The results provide insight into the effect of substitution on two basic molecular properties, which are influenced, here, by the substituent effects and by the B/N relationship in the ring. The results, along with other examples in the literature, also warn chemists that the general belief that aromaticity accounts for enhanced thermodynamic stability is not always true. The stability of cyclic, conjugated compounds depends on several effects, and only one of them is aromaticity. In addition, our calculations predict a switching of electronic properties of the NH2 group from the usual p-electron donor to a π-electron acceptor when it is moved from the B/C atoms to the nitrogen atom in all isomers, or C6 in 1,3-azaborine. This is the result of the conformational change that places the NLP in the plane of the ring and the NH bonds in a favourable spatial position to act as acceptors of π-electron density.
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Affiliation(s)
- Marija Baranac-Stojanović
- University of Belgrade - Faculty of Chemistry, Studentski trg 12-16, P.O. Box 158, 11000 Belgrade, Serbia.
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134
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Abstract
BN/CC isosterism has emerged as a viable strategy to expand the chemical space of organic molecules. In particular, the application of BN/CC isosterism to arenes has received significant attention due to the vast available chemical space provided by aromatic hydrocarbons. The synthetic efforts directed at assembling novel aromatic BN heterocycles have resulted in the discovery of new properties and functions in a variety of fields including biomedical research, medicinal chemistry, materials science, catalysis, and organic synthesis. This tutorial review specifically covers recent advances in synthetic technologies that functionalize assembled boron-nitrogen (BN) heterocycles and highlights their distinct reactivity and selectivity in comparison to their carbonaceous counterparts. It is intended to serve as a state-of-the-art compendium for readers who are interested in the reaction chemistry of BN heterocycles.
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Affiliation(s)
- Cameron R McConnell
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts, 02467-3860, USA.
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135
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Bartholome TA, Bluer KR, Martin CD. Successive carbene insertion into 9-phenyl-9-borafluorene. Dalton Trans 2019; 48:6319-6322. [PMID: 30942222 DOI: 10.1039/c9dt01032g] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The reactions of 9-phenyl-9-borafluorene with trimethylsilyldiazomethane in a 1 : 1 and 1 : 2 stoichiometry furnished the corresponding BC5 and BC6 heterocycles via the formal insertion of one and two carbene units.
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Affiliation(s)
- Tyler A Bartholome
- Baylor University, Department of Chemistry and Biochemistry, One Bear Place #97348, Waco, TX 76798, USA.
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136
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Stojanović M, Baranac-Stojanović M. Analysis of Stability and (Anti)aromaticity of BN-Dibenzo[ a
, e
]pentalenes. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801047] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Milovan Stojanović
- Institute of Chemistry, Technology and Metallurgy, Center for Chemistry; University of Belgrade; Njegoševa 12 11000 Belgrade Serbia
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137
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Herndon JW. The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2017. Coord Chem Rev 2018. [DOI: 10.1016/j.ccr.2018.08.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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138
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Lindl F, Lin S, Krummenacher I, Lenczyk C, Stoy A, Müller M, Lin Z, Braunschweig H. 1,2,3-Diazaborinine: A BN Analogue of Pyridine Obtained by Ring Expansion of a Borole with an Organic Azide. Angew Chem Int Ed Engl 2018; 58:338-342. [DOI: 10.1002/anie.201811601] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Indexed: 11/05/2022]
Affiliation(s)
- Felix Lindl
- Institute for Inorganic Chemistry; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with Boron; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Shujuan Lin
- Department of Chemistry; The Hong Kong University of Science and Technology; Clear Water Bay Kowloon, Hong Kong China
| | - Ivo Krummenacher
- Institute for Inorganic Chemistry; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with Boron; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Carsten Lenczyk
- Institute for Inorganic Chemistry; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with Boron; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Andreas Stoy
- Institute for Inorganic Chemistry; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with Boron; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Marcel Müller
- Institute for Inorganic Chemistry; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with Boron; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Zhenyang Lin
- Department of Chemistry; The Hong Kong University of Science and Technology; Clear Water Bay Kowloon, Hong Kong China
| | - Holger Braunschweig
- Institute for Inorganic Chemistry; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with Boron; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
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139
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Erb W, Hurvois JP, Roisnel T, Dorcet V. Ferroceneboronic Acid and Derivatives: Synthesis, Structure, Electronic Properties, and Reactivity in Directed C–H Bond Activation. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00501] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- William Erb
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226, F-35000 Rennes, France
| | - Jean-Pierre Hurvois
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226, F-35000 Rennes, France
| | - Thierry Roisnel
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226, F-35000 Rennes, France
| | - Vincent Dorcet
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226, F-35000 Rennes, France
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140
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Abengózar A, Fernández-González MA, Sucunza D, Frutos LM, Salgado A, García-García P, Vaquero JJ. C-H Functionalization of BN-Aromatics Promoted by Addition of Organolithium Compounds to the Boron Atom. Org Lett 2018; 20:4902-4906. [PMID: 30070487 DOI: 10.1021/acs.orglett.8b02040] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Addition of an organolithium compound to a BN-phenanthrene with embedded B and N atoms is proposed to result in coordination of RLi to the boron atom. This coordination, supported by NMR spectroscopy and DFT calculations, increases the nucleophilicity of the system in the β position to the N atom and is therefore a useful tool for promoting regioselective C-H functionalization of BN aromatics.
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Affiliation(s)
- Alberto Abengózar
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR) , Universidad de Alcalá , 28805 Alcalá de Henares , Madrid , Spain
| | - Miguel Angel Fernández-González
- Departamento de Química Analítica, Química Física e Ingeniería Química, Instituto de Investigación Química "Andrés M. del Río" (IQAR) , Universidad de Alcalá , 28805 Alcalá de Henares , Madrid , Spain
| | - David Sucunza
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR) , Universidad de Alcalá , 28805 Alcalá de Henares , Madrid , Spain
| | - Luis Manuel Frutos
- Departamento de Química Analítica, Química Física e Ingeniería Química, Instituto de Investigación Química "Andrés M. del Río" (IQAR) , Universidad de Alcalá , 28805 Alcalá de Henares , Madrid , Spain
| | - Antonio Salgado
- Centro de Espectroscopía de Resonancia Magnética Nuclear (CERMN), CAI Químicas , Universidad de Alcalá , 28805 Alcalá de Henares , Madrid , Spain
| | - Patricia García-García
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR) , Universidad de Alcalá , 28805 Alcalá de Henares , Madrid , Spain
| | - Juan J Vaquero
- Departamento de Química Orgánica y Química Inorgánica, Instituto de Investigación Química "Andrés M. del Río" (IQAR) , Universidad de Alcalá , 28805 Alcalá de Henares , Madrid , Spain
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141
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Noguchi M, Suzuki K, Kobayashi J, Yurino T, Tsurugi H, Mashima K, Yamashita M. Planar and Bent BN-Embedded p-Quinodimethanes Synthesized by Transmetalation of Bis(trimethylsilyl)-1,4-dihydropyrazines with Chloroborane. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00294] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Mao Noguchi
- Department of Applied Chemistry, Graduate School of Science and Engineering, Chuo University, 1-23-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
| | - Katsunori Suzuki
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho,
Chikusa-ku, Nagoya 464-8603, Japan
| | - Jun Kobayashi
- Department of Applied Chemistry, Graduate School of Science and Engineering, Chuo University, 1-23-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
| | - Taiga Yurino
- Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Hayato Tsurugi
- Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Kazushi Mashima
- Department of Chemistry, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
| | - Makoto Yamashita
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho,
Chikusa-ku, Nagoya 464-8603, Japan
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142
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Wang B, Li Y, Ganguly R, Webster RD, Kinjo R. A Crystalline Diazadiborinine Radical Cation and Its Boron-Centered Radical Reactivity. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201803547] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Baolin Wang
- Division of Chemistry and Biological Chemistry; School of Physical and Mathematical Sciences; Nanyang Technological University; Nanyang Link 21 Singapore 637371 Singapore
| | - Yongxin Li
- Division of Chemistry and Biological Chemistry; School of Physical and Mathematical Sciences; Nanyang Technological University; Nanyang Link 21 Singapore 637371 Singapore
| | - Rakesh Ganguly
- Division of Chemistry and Biological Chemistry; School of Physical and Mathematical Sciences; Nanyang Technological University; Nanyang Link 21 Singapore 637371 Singapore
| | - Richard D. Webster
- Division of Chemistry and Biological Chemistry; School of Physical and Mathematical Sciences; Nanyang Technological University; Nanyang Link 21 Singapore 637371 Singapore
| | - Rei Kinjo
- Division of Chemistry and Biological Chemistry; School of Physical and Mathematical Sciences; Nanyang Technological University; Nanyang Link 21 Singapore 637371 Singapore
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143
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Wang B, Li Y, Ganguly R, Webster RD, Kinjo R. A Crystalline Diazadiborinine Radical Cation and Its Boron-Centered Radical Reactivity. Angew Chem Int Ed Engl 2018; 57:7826-7829. [DOI: 10.1002/anie.201803547] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2018] [Indexed: 11/07/2022]
Affiliation(s)
- Baolin Wang
- Division of Chemistry and Biological Chemistry; School of Physical and Mathematical Sciences; Nanyang Technological University; Nanyang Link 21 Singapore 637371 Singapore
| | - Yongxin Li
- Division of Chemistry and Biological Chemistry; School of Physical and Mathematical Sciences; Nanyang Technological University; Nanyang Link 21 Singapore 637371 Singapore
| | - Rakesh Ganguly
- Division of Chemistry and Biological Chemistry; School of Physical and Mathematical Sciences; Nanyang Technological University; Nanyang Link 21 Singapore 637371 Singapore
| | - Richard D. Webster
- Division of Chemistry and Biological Chemistry; School of Physical and Mathematical Sciences; Nanyang Technological University; Nanyang Link 21 Singapore 637371 Singapore
| | - Rei Kinjo
- Division of Chemistry and Biological Chemistry; School of Physical and Mathematical Sciences; Nanyang Technological University; Nanyang Link 21 Singapore 637371 Singapore
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144
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Mellerup SK, Li C, Radtke J, Wang X, Li QS, Wang S. Photochemical Generation of Chiral N,B,X-Heterocycles by Heteroaromatic C−X Bond Scission (X=S, O) and Boron Insertion. Angew Chem Int Ed Engl 2018; 57:9634-9639. [PMID: 29682875 DOI: 10.1002/anie.201803760] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Indexed: 02/04/2023]
Affiliation(s)
- Soren K. Mellerup
- Department of Chemistry; Queen's University; Kingston Ontario K7L 3N6 Canada
| | - Cally Li
- Department of Chemistry; Queen's University; Kingston Ontario K7L 3N6 Canada
| | - Julian Radtke
- Institut für Anorganische und Analytische Chemie; Goethe-Universität Frankfurt; 60438 Frankfurt (Main) Germany
| | - Xiang Wang
- Department of Chemistry; Queen's University; Kingston Ontario K7L 3N6 Canada
| | - Quan-Song Li
- Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials; School of Chemistry; Beijing Institute of Technology; Beijing 10081 P. R. China
| | - Suning Wang
- Department of Chemistry; Queen's University; Kingston Ontario K7L 3N6 Canada
- Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials; School of Chemistry; Beijing Institute of Technology; Beijing 10081 P. R. China
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145
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Mellerup SK, Li C, Radtke J, Wang X, Li QS, Wang S. Photochemical Generation of Chiral N,B,X-Heterocycles by Heteroaromatic C−X Bond Scission (X=S, O) and Boron Insertion. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201803760] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Soren K. Mellerup
- Department of Chemistry; Queen's University; Kingston Ontario K7L 3N6 Canada
| | - Cally Li
- Department of Chemistry; Queen's University; Kingston Ontario K7L 3N6 Canada
| | - Julian Radtke
- Institut für Anorganische und Analytische Chemie; Goethe-Universität Frankfurt; 60438 Frankfurt (Main) Germany
| | - Xiang Wang
- Department of Chemistry; Queen's University; Kingston Ontario K7L 3N6 Canada
| | - Quan-Song Li
- Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials; School of Chemistry; Beijing Institute of Technology; Beijing 10081 P. R. China
| | - Suning Wang
- Department of Chemistry; Queen's University; Kingston Ontario K7L 3N6 Canada
- Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials; School of Chemistry; Beijing Institute of Technology; Beijing 10081 P. R. China
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146
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Li C, Liu Y, Sun Z, Zhang J, Liu M, Zhang C, Zhang Q, Wang H, Liu X. Synthesis, Characterization, and Properties of Bis-BN Ullazines. Org Lett 2018; 20:2806-2810. [DOI: 10.1021/acs.orglett.8b00554] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Chenglong Li
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, People’s Republic of China
| | - Yuming Liu
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, People’s Republic of China
| | - Zhe Sun
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, People’s Republic of China
| | - Jinyun Zhang
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, People’s Republic of China
| | - Meiyan Liu
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, People’s Republic of China
| | - Chen Zhang
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, People’s Republic of China
| | - Qian Zhang
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, People’s Republic of China
| | - Hongjuan Wang
- Institute of New Energy Materials & Low Carbon Technology, School of Material Science & Engineering, Tianjin University of Technology, Tianjin 300384, People’s Republic of China
| | - Xuguang Liu
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, People’s Republic of China
- Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, People’s Republic of China
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147
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Lik A, Kargin D, Isenberg S, Kelemen Z, Pietschnig R, Helten H. PBP bridged [3]ferrocenophane: a bisphosphanylborane with a redox trigger. Chem Commun (Camb) 2018; 54:2471-2474. [PMID: 29387839 DOI: 10.1039/c7cc09759j] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Stereospecific access to the unprecedented P-B-P bridged [3]ferrocenophane Fe(C5H4PtBu)2BMes is presented. In contrast to acyclic ferrocenylphosphanes, we find evidence for a shift of spin-density from Fe to P upon pyramidal inversion of the P centers in the mono-cation; the latter has a lifetime of τ = 0.31(4) s.
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Affiliation(s)
- Artur Lik
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056 Aachen, Germany.
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148
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Yuan K, Wang X, Wang S. Cascade Dehydrogenative Hydroboration for the Synthesis of Azaborabenzofulvenes. Org Lett 2018; 20:1617-1620. [PMID: 29484886 DOI: 10.1021/acs.orglett.8b00363] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Tandem dehydrogenative hydroboration has been established to be highly effective in the synthesis of BN isosteres of benzofulvene and derivatives. The scope of this synthetic method is applicable to a variety of substrates. Spectroscopic and computational studies indicate that the new azaborabenzofulvenes have similar electronic properties as their carbonaceous analogues.
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Affiliation(s)
- Kang Yuan
- Department of Chemistry , Queen's University , Kingston , Ontario K7L 3N6 , Canada
| | - Xiang Wang
- Department of Chemistry , Queen's University , Kingston , Ontario K7L 3N6 , Canada
| | - Suning Wang
- Department of Chemistry , Queen's University , Kingston , Ontario K7L 3N6 , Canada
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149
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Ayhan O, Riensch NA, Glasmacher C, Helten H. Cyclolinear Oligo- and Poly(iminoborane)s: The Missing Link in Inorganic Main-Group Macromolecular Chemistry. Chemistry 2018; 24:5883-5894. [DOI: 10.1002/chem.201705913] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Indexed: 11/05/2022]
Affiliation(s)
- Ozan Ayhan
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52056 Aachen Germany
| | - Nicolas A. Riensch
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52056 Aachen Germany
| | - Clemens Glasmacher
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52056 Aachen Germany
| | - Holger Helten
- Institute of Inorganic Chemistry; RWTH Aachen University; Landoltweg 1 52056 Aachen Germany
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150
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Giustra ZX, Liu SY. The State of the Art in Azaborine Chemistry: New Synthetic Methods and Applications. J Am Chem Soc 2018; 140:1184-1194. [PMID: 29314835 PMCID: PMC6190836 DOI: 10.1021/jacs.7b09446] [Citation(s) in RCA: 257] [Impact Index Per Article: 42.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Boron-nitrogen heteroarenes hold great promise for practical application in many areas of chemistry. Enduring interest in realizing this potential has in turn driven perennial innovation with respect to these compounds' synthesis. This Perspective discusses in detail the most recent advances in methods pertaining to the preparation of BN-isosteres of benzene, naphthalene, and their derivatives. Additional focus is placed on the progress enabled by these syntheses toward functional utility of such BN-heterocycles in biochemistry and pharmacology, materials science, and transition-metal-based catalysis. The prospects for future research efforts in these and related fields are also assessed.
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Affiliation(s)
- Zachary X. Giustra
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Shih-Yuan Liu
- Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, United States
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