1
|
Afsan Z, Ahmad A, Zafar M, Das A, Roisnel T, Ghosh S. The chemistry of κ-N,S-chelated Ru(II) complexes with 1,4-diethynylbenzene. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.116120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
2
|
Andrés JL, Suárez E, Martín M, Sola E. Mechanistic Versatility at Ir(PSiP) Pincer Catalysts: Triflate Proton Shuttling from 2-Butyne to Diene and [3]Dendralene Motifs. Organometallics 2022; 41:2622-2630. [PMID: 36185395 PMCID: PMC9518705 DOI: 10.1021/acs.organomet.2c00375] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Indexed: 11/28/2022]
Abstract
![]()
The five-coordinate
hydrido complex [IrH(OTf)(PSiP)]
(1) catalytically transforms 2-butyne into a mixture
of its isomer
1,3-butadiene, and [3]dendralene and linear hexatriene dimerization
products: (E)-4-methyl-3-methylene-1,4-hexadiene
and (3Z)-3,4-dimethyl-1,3,5-hexatriene, respectively.
Under the conditions of the catalytic reaction, benzene, and 363 K,
the hexatriene further undergoes thermal electrocyclization into 2,3-dimethyl-1,3-cyclohexadiene.
The reactions between 1 and the alkyne substrate allow
isolation or nuclear magnetic resonance (NMR) observation of catalyst
resting states and possible reaction intermediates, including complexes
with the former PSiP pincer ligands disassembled into PSi and PC chelates,
and species coordinating allyl or carbene fragments en route to products.
The density functional theory (DFT) calculations guided by these experimental
observations disclose competing mechanisms for C–H bond elaboration
that move H atoms either classically, as hydrides, or as protons transported
by the triflate. This latter role of triflate, previously recognized
only for more basic anions such as carboxylates, is discussed to result
from combining the unfavorable charge separation in the nonpolar solvent
and the low electronic demand from the metal to the anion at coordination
positions trans to silicon. Triflate deprotonation of methyl groups
is key to release highly coordinating diene products from stable allyl
intermediates, thus enabling catalytic cycling.
Collapse
Affiliation(s)
- José L. Andrés
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC − Universidad de Zaragoza, Facultad de Ciencias, E50009 Zaragoza, Spain
| | - Elizabeth Suárez
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC − Universidad de Zaragoza, Facultad de Ciencias, E50009 Zaragoza, Spain
| | - Marta Martín
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC − Universidad de Zaragoza, Facultad de Ciencias, E50009 Zaragoza, Spain
| | - Eduardo Sola
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC − Universidad de Zaragoza, Facultad de Ciencias, E50009 Zaragoza, Spain
| |
Collapse
|
3
|
Corpas J, Arpa EM, Lapierre R, Corral I, Mauleón P, Arrayás RG, Carretero JC. Interplay between the Directing Group and Multifunctional Acetate Ligand in Pd-Catalyzed anti-Acetoxylation of Unsymmetrical Dialkyl-Substituted Alkynes. ACS Catal 2022; 12:6596-6605. [PMID: 35692253 PMCID: PMC9173690 DOI: 10.1021/acscatal.2c00710] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Revised: 05/07/2022] [Indexed: 12/31/2022]
Abstract
![]()
The cooperative action
of the acetate ligand, the 2-pyridyl sulfonyl
(SO2Py) directing group on the alkyne substrate, and the
palladium catalyst has been shown to be crucial for controlling reactivity,
regioselectivity, and stereoselectivity in the acetoxylation of unsymmetrical
internal alkynes under mild reaction conditions. The corresponding
alkenyl acetates were obtained in good yields with complete levels
of β-regioselectivity and anti-acetoxypalladation
stereocontrol. Experimental and computational analyses provide insight
into the reasons behind this delicate interplay between the ligand,
directing group, and the metal in the reaction mechanism. In fact,
these studies unveil the multiple important roles of the acetate ligand
in the coordination sphere at the Pd center: (i) it brings the acetic
acid reagent into close proximity to the metal to allow the simultaneous
activation of the alkyne and the acetic acid, (ii) it serves as an
inner-sphere base while enhancing the nucleophilicity of the acid,
and (iii) it acts as an intramolecular acid to facilitate protodemetalation
and regeneration of the catalyst. Further insight into the origin
of the observed regiocontrol is provided by the mapping of potential
energy profiles and distortion–interaction analysis.
Collapse
Affiliation(s)
- Javier Corpas
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid (UAM), 28049 Madrid, Spain
| | - Enrique M. Arpa
- Division of Theoretical Chemistry, IFM, Linköping University, 581 83 Linköping, Sweden
| | - Romain Lapierre
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid (UAM), 28049 Madrid, Spain
| | - Inés Corral
- Departamento de Química, Facultad de Ciencias, UAM, Cantoblanco, 28049 Madrid, Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem), UAM, 28049 Madrid, Spain
| | - Pablo Mauleón
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid (UAM), 28049 Madrid, Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem), UAM, 28049 Madrid, Spain
| | - Ramón Gómez Arrayás
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid (UAM), 28049 Madrid, Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem), UAM, 28049 Madrid, Spain
| | - Juan C. Carretero
- Departamento de Química Orgánica, Facultad de Ciencias, Universidad Autónoma de Madrid (UAM), 28049 Madrid, Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem), UAM, 28049 Madrid, Spain
| |
Collapse
|
4
|
Galiana-Cameo M, Urriolabeitia A, Barrenas E, Passarelli V, Pérez-Torrente JJ, Di Giuseppe A, Polo V, Castarlenas R. Metal–Ligand Cooperative Proton Transfer as an Efficient Trigger for Rhodium-NHC-Pyridonato Catalyzed gem-Specific Alkyne Dimerization. ACS Catal 2021. [DOI: 10.1021/acscatal.1c00602] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- María Galiana-Cameo
- Departamento de Química Inorgánica−Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Universidad de Zaragoza−CSIC, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Asier Urriolabeitia
- Departamento de Química Física, Universidad de Zaragoza, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Eduardo Barrenas
- Departamento de Química Inorgánica−Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Universidad de Zaragoza−CSIC, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Vincenzo Passarelli
- Departamento de Química Inorgánica−Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Universidad de Zaragoza−CSIC, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
- Centro Universitario de la Defensa, Ctra Huesca S/N, 50090 Zaragoza, Spain
| | - Jesús J. Pérez-Torrente
- Departamento de Química Inorgánica−Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Universidad de Zaragoza−CSIC, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Andrea Di Giuseppe
- Departamento de Química Inorgánica−Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Universidad de Zaragoza−CSIC, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
- Dipartimento di Scienze Fisiche e Chimiche, Università dell’Aquila, via Vetoio, I-67100 Coppito (AQ), Italy
| | - Víctor Polo
- Departamento de Química Física, Universidad de Zaragoza, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Ricardo Castarlenas
- Departamento de Química Inorgánica−Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), Universidad de Zaragoza−CSIC, C/Pedro Cerbuna 12, 50009 Zaragoza, Spain
| |
Collapse
|
5
|
Pan D, Luo G, Yu Y, Yang J, Luo Y. Computational insights into Ir(iii)-catalyzed allylic C-H amination of terminal alkenes: mechanism, regioselectivity, and catalytic activity. RSC Adv 2021; 11:19113-19120. [PMID: 35478613 PMCID: PMC9033584 DOI: 10.1039/d1ra03842g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Accepted: 05/19/2021] [Indexed: 01/10/2023] Open
Abstract
Computational studies on Ir(iii)-catalyzed intermolecular branch-selective allylic C–H amination of terminal olefins with methyl dioxazolone have been carried out to investigate the mechanism, including the origins of regioselectivity and catalytic activity difference. The result suggests that the reaction proceeds through generation of active species, alkene coordination, allylic C–H activation, decarboxylation, migratory insertion, and protodemetalation. The presence of AgNTf2 could thermodynamically promote the formation of catalytically active species [Cp*Ir(OAc)]+. Both the weaker Ir–C(internal) bond and the closer interatomic distance of N⋯C(internal) in the key allyl-Ir(v)-nitrenoid intermediate make the migratory insertion into Ir–C(internal) bond easier than into the Ir–C(terminal) bond, leading to branch-selective allylic C–H amidation. The high energy barrier for allylic C–H activation in the Co system could account for the observed sluggishness, which is mainly ascribed to the weaker coordination capacity of alkenes to the triplet Cp*Co(OAc)+ and the deficient metal⋯H interaction to assist hydrogen transfer. DFT studies on Ir(iii)-catalyzed branch-selective allylic C–H amination of terminal olefins with methyl dioxazolone have been carried out to investigate the mechanism, including the origins of regioselectivity and catalytic activity difference.![]()
Collapse
Affiliation(s)
- Deng Pan
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology Dalian 116024 China
| | - Gen Luo
- Institutes of Physical Science and Information Technology, Anhui University Hefei 230601 China
| | - Yang Yu
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology Dalian 116024 China
| | - Jimin Yang
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology Dalian 116024 China
| | - Yi Luo
- State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology Dalian 116024 China .,PetroChina Petrochemical Research Institute Beijing 102206 China
| |
Collapse
|
6
|
Zafar M, Ramalakshmi R, Pathak K, Ahmad A, Roisnel T, Ghosh S. Five-Membered Ruthenacycles: Ligand-Assisted Alkyne Insertion into 1,3-N,S-Chelated Ruthenium Borate Species. Chemistry 2019; 25:13537-13546. [PMID: 31332858 DOI: 10.1002/chem.201902663] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Indexed: 11/10/2022]
Abstract
Building upon previous work, the chemistry of [(η6 -p-cymene)Ru{P(OMe)2 OR}Cl2 ], (R=H or Me) has been extended with [H2 B(mbz)2 ]- (mbz=2-mercaptobenzothiazolyl) using different Ru precursors and borate ligands. As a result, a series of 1,3-N,S-chelated ruthenium borate complexes, for example, [(κ2 -N,S-L)PR3 Ru{κ3 -H,S,S'-H2 B(L)2 }], (2 a-d and 2 a'-d'; R=Ph, Cy, OMe or OPh and L=C5 H4 NS or C7 H4 NS2 ) and [Ru{κ3 -H,S,S'-H2 B(L)2 }2 ], (3: L=C5 H4 NS, 3': L=C7 H4 NS2 ) were isolated upon treatment of [(η6 -p-cymene)RuCl2 PR3 ], 1 a-d (R=Ph, Cy, OMe or OPh) with [H2 B(mp)2 ]- or [H2 B(mbz)2 ]- ligands (mp=2-mercaptopyridyl). All the Ru borate complexes, 2 a-d and 2 a'-d' are stabilized by phosphine/phosphite and hemilabile N,S-chelating ligands. Treatment of these Ru borate species, 2 a'-c' with various terminal alkynes yielded two different types of five-membered ruthenacycle species, namely [PR3 {C7 H4 S2 -(E)-N-C=CH(R')}Ru{κ3 -H,S,S'-H2 B(L)2 }], (4-4'; R=Ph and R'=CO2 Me or C6 H4 NO2 ; L=C7 H4 NS2 ) and [PR3 {C7 H4 NS-(E)-S-C=CH(R')}Ru{κ3 -H,S,S'-H2 B(L)2 }], (5-5', 6 and 7; R=Ph, Cy or OMe and R'=CO2 Me or C6 H4 NO2 ; L=C7 H4 NS2 ). All these five-membered ruthenacycle species contain an exocyclic C=C moiety, presumably formed by the insertion of a terminal alkyne into the Ru-N and Ru-S bonds. The new species have been characterized spectroscopically and the structures were further confirmed by single-crystal X-ray diffraction analysis. Theoretical studies and chemical-bonding analyses established that charge transfer occurs from phosphorus to ruthenium center following the trend PCy3 <PPh3 <P(OPh)3 <P(OMe)3 .
Collapse
Affiliation(s)
- Mohammad Zafar
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Rongala Ramalakshmi
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Kriti Pathak
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Asif Ahmad
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
| | - Thierry Roisnel
- Univ Rennes, CNRS, Institut des Sciences Chimiques de Rennes, UMR 6226, 35042, Rennes, France
| | - Sundargopal Ghosh
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, 600036, India
| |
Collapse
|
7
|
Leeb NM, Drover MW, Love JA, Schafer LL, Slattery JM. Phosphoramidate-Assisted Alkyne Activation: Probing the Mechanism of Proton Shuttling in a N,O-Chelated Cp*Ir(III) Complex. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00656] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nina M. Leeb
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
| | - Marcus W. Drover
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Jennifer A. Love
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
| | - Laurel L. Schafer
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
| | - John M. Slattery
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
| |
Collapse
|