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Hansjacob P, Leroux FR, Gandon V, Donnard M. Palladium-Catalyzed Silylcyanation of Ynamides: Regio- and Stereoselective Access to Tetrasubstituted 3-Silyl-2-Aminoacrylonitriles. Angew Chem Int Ed Engl 2022; 61:e202200204. [PMID: 35060272 DOI: 10.1002/anie.202200204] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Indexed: 01/02/2023]
Abstract
The palladium-catalyzed silylcyanation of ynamides is described. This reaction is fully regioselective, delivering tetrasubstituted 2-aminoacrylonitriles derivatives exclusively. Unexpectedly, the nature (aryl or alkyl) of the substituent located at the β-position of the ynamide directly controls the stereoselectivity. The reaction tolerates a number of functional groups and can be considered as the first general access to fully substituted 2-aminoacrylonitriles. Given the singular reactivity observed, a computational study was performed to shed light on the mechanism of this intriguing transformation. Relying on the specific reactivity of the newly installed vinylsilane functionality, the scope of 2-aminoacrylonitriles has been enlarged by postfunctionalization.
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Affiliation(s)
- Pierre Hansjacob
- Laboratoire d'Innovation Moléculaire et Applications (UMR 7042), Université de Strasbourg, Université de Haute-Alsace, CNRS, 67000, Strasbourg, France
| | - Frédéric R Leroux
- Laboratoire d'Innovation Moléculaire et Applications (UMR 7042), Université de Strasbourg, Université de Haute-Alsace, CNRS, 67000, Strasbourg, France
| | - Vincent Gandon
- Institut de Chimie Moléculaire et des Matériaux d'Orsay, CNRS UMR 8182, Université Paris-Saclay, Bâtiment 420, 91405, Orsay cedex, France.,Laboratoire de Chimie Moléculaire (LCM), CNRS UMR 9168, Ecole Polytechnique, Institut Polytechnique de Paris, route de Saclay, 91128, Palaiseau cedex, France
| | - Morgan Donnard
- Laboratoire d'Innovation Moléculaire et Applications (UMR 7042), Université de Strasbourg, Université de Haute-Alsace, CNRS, 67000, Strasbourg, France
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2
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Hansjacob P, Leroux FR, Gandon V, Donnard M. Palladium‐Catalyzed Silylcyanation of Ynamides: Regio‐ and Stereoselective Access to Tetrasubstituted 3‐Silyl‐2‐Aminoacrylonitriles. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202200204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Pierre Hansjacob
- Laboratoire d'Innovation Moléculaire et Applications (UMR 7042) Université de Strasbourg Université de Haute-Alsace CNRS 67000 Strasbourg France
| | - Frédéric R. Leroux
- Laboratoire d'Innovation Moléculaire et Applications (UMR 7042) Université de Strasbourg Université de Haute-Alsace CNRS 67000 Strasbourg France
| | - Vincent Gandon
- Institut de Chimie Moléculaire et des Matériaux d'Orsay CNRS UMR 8182 Université Paris-Saclay Bâtiment 420 91405 Orsay cedex France
- Laboratoire de Chimie Moléculaire (LCM) CNRS UMR 9168 Ecole Polytechnique Institut Polytechnique de Paris route de Saclay 91128 Palaiseau cedex France
| | - Morgan Donnard
- Laboratoire d'Innovation Moléculaire et Applications (UMR 7042) Université de Strasbourg Université de Haute-Alsace CNRS 67000 Strasbourg France
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3
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Xu S, Yang D, Zhao J, Wang B, Qu J. Formation of thiolate-bridged diiron complexes featuring anionic isocyanide originating from the activation of counterions in the outer sphere. Dalton Trans 2021; 50:18027-18035. [PMID: 34825913 DOI: 10.1039/d1dt03482k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Transition metal isocyanide complexes have attracted increasing attention owing to their versatile applications in catalytic organic transformations. Compared with metal complexes with neutral isocyanide ligands, those featuring anionic isocyanide groups are relatively rare and poorly understood. So far, there has been no report on structurally characterized metal anionic isocyanopentafluorophosphate complexes that may have potential for the development of some unique polymerization reactions. In this paper, we adopt a dicationic thiolate-bridged diiron complex as the reaction platform for the coordination activation and functionalization of cyanide. When treating with KCN, a facile salt metathesis with hexafluorophosphate anions occurred to generate monocyanide or dicyanide species. However, using trimethylsilyl cyanide as the substrate, an unsymmetrical diiron complex bearing a terminal [CNSiMe3] ligand and an anionic [NCPF5]- group derived from the activation of one non-coordinating anion PF6- was obtained in a high yield. Interestingly, due to the lability of the N-Si bond in the [CNSiMe3] ligand, it can play the role of an active site for the interaction with counter anions in the outer sphere. On one hand, this labile ligand can facilitate the activation of the P-F bond in PF6- and the C-B bond in BPh4- to afford structurally characterized thiolate-bridged diiron anionic isocyanopentafluorophosphate and isocyanotriphenylborate complexes, respectively. On the other hand, it can also interact with Lut·HCl to convert into a cyanide ligand stabilized by a hydrogen bonding interaction. This work represents a new synthetic pathway to furnish metal anionic isocyanide complexes.
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Affiliation(s)
- Sunlin Xu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P.R. China.
| | - Dawei Yang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P.R. China.
| | - Jinfeng Zhao
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P.R. China.
| | - Baomin Wang
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P.R. China.
| | - Jingping Qu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, P.R. China.
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Davydova EI, Virovets A, Peresypkina E, Pomogaeva AV, Lisovenko AS, Timoshkin AY. Unusual molecular complexes of antimony fluoride dimers with acetonitrile and pyridine: structures and bonding. Dalton Trans 2021; 50:13357-13367. [PMID: 34608911 DOI: 10.1039/d1dt02412d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The structures of two new molecular complexes of antimony pentafluoride with pyridine (Py) and acetonitrile (AN), SbF5·Py and Sb2F10·AN, and a molecular complex of antimony trifluoride Sb2F6·Py and its ionic derivative [HPy]+[Sb2F7]- in the solid state have been determined by single crystal X-ray structural analysis. The complexes Sb2F10·AN and Sb2F6·Py are the first structurally characterized compounds of dimeric antimony fluorides. To reveal the nature of bonding in the complexes and their stability, DFT computations of the electronic structure and thermodynamic characteristics were performed, in particular the analysis of the electrostatic potentials, the orbital interactions and the topology. The results indicate that the intermolecular Sb⋯F interactions can be described as a network of pnictogen bonds.
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Affiliation(s)
- Elena I Davydova
- Institute of Chemistry, Saint Petersburg State University, Universitetskaya emb. 7/9, 199034, St Petersburg, Russia.
| | - Alexander Virovets
- University of Regensburg, Universitaetsstr. 31, 93053 Regensburg, Germany
| | | | - Anna V Pomogaeva
- Institute of Chemistry, Saint Petersburg State University, Universitetskaya emb. 7/9, 199034, St Petersburg, Russia.
| | - Anna S Lisovenko
- Institute of Chemistry, Saint Petersburg State University, Universitetskaya emb. 7/9, 199034, St Petersburg, Russia.
| | - Alexey Y Timoshkin
- Institute of Chemistry, Saint Petersburg State University, Universitetskaya emb. 7/9, 199034, St Petersburg, Russia.
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Clausing ST, Morales Salazar D, Orthaber A. Preparation, photo- and electrochemical studies of a homoleptic imine-phosphaalkene Cu(I) complex. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119958] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Takeuchi K, Tanaka Y, Tanigawa I, Ozawa F, Choi JC. Cu(i) complex bearing a PNP-pincer-type phosphaalkene ligand with a bulky fused-ring Eind group: properties and applications to FLP-type bond activation and catalytic CO 2 reduction. Dalton Trans 2020; 49:3630-3637. [PMID: 32129407 DOI: 10.1039/d0dt00276c] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Herein, we report the synthesis of [Cu(Eind2-BPEP)][PF6] (2) (Eind2-BPEP = 2,6-bis(2-Eind-2-phosphaethenyl)pyridine, Eind = 1,1,3,3,5,5,7,7-octaethyl-1,2,3,5,6,7-hexahydro-s-indacen-4-yl), a three-coordinated Cu(i) complex bearing a PNP-pincer-type phosphaalkene ligand with bulky fused-ring Eind groups. The Gutmann-Beckett test revealed that complex 2 is highly Lewis acidic and comparable in strength to B(C6F5)3, which is a relatively strong Lewis acid. In addition, 2 is more Lewis acidic than [Cu(Mes*2-BPEP)][PF6] (3), the analogous complex with less-bulky Mes* instead of Eind groups. DFT calculations using model compounds revealed that the higher Lewis acidity of 2 compared to 3 is not due to the electronic effects of the ligand, but due to a reduction in the LUMO energy caused by the steric effect of the bulky Eind groups. When combined with a tertiary amine, the highly Lewis acidic and bulky 2 exhibits the reactivity of a frustrated Lewis pair (FLP) and can activate hydrogen and phenylacetylene. Complexes 2 and 3 were found to catalyze the hydrogenation and hydrosilylation of CO2 in the presence of DBU under relatively mild conditions.
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Affiliation(s)
- Katsuhiko Takeuchi
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan.
| | - Yuto Tanaka
- International Research Center for Elements Science (IRCELS), Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Ippei Tanigawa
- International Research Center for Elements Science (IRCELS), Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Fumiyuki Ozawa
- International Research Center for Elements Science (IRCELS), Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Jun-Chul Choi
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan.
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Nakashige ML, Loristo JIP, Wong LS, Gurr JR, O'Donnell TJ, Yoshida WY, Rheingold AL, Hughes RP, Cain MF. E-Selective Synthesis and Coordination Chemistry of Pyridine-Phosphaalkenes: Five Ligands Produce Four Distinct Types of Ru(II) Complexes. Organometallics 2019; 38:3338-3348. [PMID: 33299263 DOI: 10.1021/acs.organomet.9b00425] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Pyridine-phosphaalkene (PN) ligands 2a-e were prepared in an E-selective fashion using phospha-Wittig methodology. Treatment of these five ligands, varying only in their 6-substituent with RuCl2(PPh3)3, produced four distinct types of coordination complexes: pyridine-phosphaalkene-derived 3b,d, cyclized 4e, and six-coordinate 5a and 6c. Prolonged heating of 3b,d in THF resulted in C-H activation of the Mes* group and cyclization to give 4b,d featuring a bidentate pyridine-phospholane ligand bound to the metal center. Complex 5a, also possessing a newly formed phospholane ring, contained a different spatial arrangement of donors to Ru(II) with an agostic Ru-H-C interaction serving as the sixth donor to the transition metal center. Ligands 2b,d,e and Ru(II) complexes 3b, 4b,e and 5a were all characterized by X-ray crystallography. Six-coordinate 6c featured a structure similar to 4b,d,e, but with the CF3 substituent acting as a weakly bound sixth ligand to the Ru(II) center, as observed by 31P{1H} and19F NMR spectroscopy. The calculated structure of 6c established that the closest Ru- - -F contact was at 2.978 Å.
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Affiliation(s)
- Mika L Nakashige
- Department of Chemistry, University of Hawai'i at Mānoa, 2545 McCarthy Mall, Honolulu, Hawaii 96822, United States
| | - Jarin I P Loristo
- Department of Chemistry, University of Hawai'i at Mānoa, 2545 McCarthy Mall, Honolulu, Hawaii 96822, United States
| | - Lesley S Wong
- Department of Chemistry, University of Hawai'i at Mānoa, 2545 McCarthy Mall, Honolulu, Hawaii 96822, United States
| | - Joshua R Gurr
- Department of Chemistry, University of Hawai'i at Mānoa, 2545 McCarthy Mall, Honolulu, Hawaii 96822, United States
| | - Timothy J O'Donnell
- Department of Chemistry, University of Hawai'i at Mānoa, 2545 McCarthy Mall, Honolulu, Hawaii 96822, United States
| | - Wesley Y Yoshida
- Department of Chemistry, University of Hawai'i at Mānoa, 2545 McCarthy Mall, Honolulu, Hawaii 96822, United States
| | - Arnold L Rheingold
- Department of Chemistry, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Russell P Hughes
- 6128 Burke Laboratory, Department of Chemistry, Dartmouth College, Hanover, New Hampshire 03755, United States
| | - Matthew F Cain
- Department of Chemistry, University of Hawai'i at Mānoa, 2545 McCarthy Mall, Honolulu, Hawaii 96822, United States
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8
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Zierkiewicz W, Michalczyk M, Scheiner S. Implications of monomer deformation for tetrel and pnicogen bonds. Phys Chem Chem Phys 2018. [DOI: 10.1039/c8cp00430g] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Monomer rearrangement raises the interaction energy by up to 20 kcal mol−1and intensifies its σ-hole by a factor of 1.5–2.9.
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Affiliation(s)
- Wiktor Zierkiewicz
- Faculty of Chemistry
- Wrocław University of Science and Technology
- 50-370 Wrocław
- Poland
| | - Mariusz Michalczyk
- Faculty of Chemistry
- Wrocław University of Science and Technology
- 50-370 Wrocław
- Poland
| | - Steve Scheiner
- Department of Chemistry and Biochemistry
- Utah State University
- Logan
- USA
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Scilabra P, Terraneo G, Resnati G. Fluorinated elements of Group 15 as pnictogen bond donor sites. J Fluor Chem 2017. [DOI: 10.1016/j.jfluchem.2017.10.002] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Ozawa F, Nakajima Y. PNP-Pincer-Type Phosphaalkene Complexes of Late Transition Metals. CHEM REC 2016; 16:2314-2323. [PMID: 27456074 DOI: 10.1002/tcr.201600054] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2016] [Indexed: 01/31/2023]
Abstract
This account summarizes our recent studies on PNP-pincer-type phosphaalkene complexes. Phosphaalkenes with a P=C bond possess an extremely low-lying π* orbital and have a marked tendency to engage in strong π back-bonding with transition metals. This particular ligand property provides PNP-pincer complexes with unique structures and reactivities. 2,6-Bis(phosphaethenyl)pyridine leads to the isolation of coordinatively unsaturated complexes of Fe(I) and Cu(I); the former adopts a trigonal monopyramidal configuration, whereas the latter has a strong affinity for PF6- and SbF6- as non-coordinating anions. Unsymmetrical PNP-pincer-type phosphaalkene complexes of Ir(I) bearing a dearomatized pyridine unit instantly cleave the N-H bond of NH3 and the C-H bond of MeCN at room temperature. The dearomatized iridium complexes catalyze the dehydrative coupling of amines with alcohols to afford N-alkylated amines and imines in high yields.
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Affiliation(s)
- Fumiyuki Ozawa
- International Research Center for Elements Science (IRCELS), Institute for Chemical Research Kyoto University, Uji, Kyoto, 611-0011, Japan.
| | - Yumiko Nakajima
- Interdisciplinary Research Center for Catalytic Chemistry National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, 305-8565, Japan.
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11
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Serin SC, Pick FS, Dake GR, Gates DP. Copper(I) Complexes of Pyridine-Bridged Phosphaalkene-Oxazoline Pincer Ligands. Inorg Chem 2016; 55:6670-8. [DOI: 10.1021/acs.inorgchem.6b00917] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Spencer C. Serin
- Department of Chemistry, University of British Columbia, 2036
Main Mall, Vancouver, British
Columbia, Canada
| | - Fraser S. Pick
- Department of Chemistry, University of British Columbia, 2036
Main Mall, Vancouver, British
Columbia, Canada
| | - Gregory R. Dake
- Department of Chemistry, University of British Columbia, 2036
Main Mall, Vancouver, British
Columbia, Canada
| | - Derek P. Gates
- Department of Chemistry, University of British Columbia, 2036
Main Mall, Vancouver, British
Columbia, Canada
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