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Qin P, Holland RL, Bunker KD, O'Connor JM, Baldridge KK, Rheingold AL. Acid-Induced Liberation of Polysubstituted Cyclopentadiene Ligands from Cyclopentadienyl Cobalt: A [2 + 2 + 1] Cycloaddition Route toward 1,2,4-Trisubstituted Cyclopentadienes. J Org Chem 2019; 84:13992-14004. [PMID: 31549512 DOI: 10.1021/acs.joc.9b02182] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Here, we report that trifluoroacetic acid (TFAH) induces demetallation and protodesilylation of the cyclopentadiene ligand in cobalt-η4-cyclopentadiene complexes of general formula [(η5-C5H5)Co(η4-exo-C(TMS)═C(SO2Ph)CH═CRCH(CO2Et))] (1-Ph, R = Ph; 1-ArtBu, R = p-C6H4tBu; 1-ArNMe2, R = p-C6H4NMe2; and 1-Me, R = Me). The trisubstituted cyclopentadiene products are isolated as a mixture of two tautomers, [(CH2C(SO2Ph)═CHC(CO2Et)═CR)] (8-R-A) and [(CH═C(SO2Ph)CH2C(CO2Et)═CR)] (8-R-B). The endo isomer, [(η5-C5H5)Co(η4-endo-C(TMS)═C(SO2Ph)CH═CPhCH(CO2Et))] (1-Ph-endo), also undergoes demetallation and protodesilylation to give 8-Ph-A and 8-Ph-B in excellent yield. The cobalt-cyclopentadiene complex, [(η5-C5H5)Co(η4-exo-C(TMS)═C(SO2Ph)CH═C(CO2Me)CH(CO2Et))] (1-CO2Me), undergoes demetallation and protodesilylation upon treatment with TFAH to give a hydrogen-bonded fulvenol (8-CO2Me). Liberation of the ethoxy-substituted cyclopentadiene ligand of [(η5-C5H5)Co(η4-exo-C(TMS)═C(SO2Ph)CH═C(OEt)CH(CO2Et))] (1-OEt) leads to formation of a cyclopentenone derivative (11). Thermolysis of 8-Ph-A/8-Ph-B in the presence of maleimide leads to a highly functionalized Diels-Alder adduct, whereas 8-Ph-A/8-Ph-B serves as precursors to trisubstituted ruthenocenes by in situ deprotonation and reaction with [(η5-C5R5)Ru(NCMe)3]PF6 (16-H, R = H; 16-Me, R = Me).
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Affiliation(s)
- Pengjin Qin
- Department of Chemistry and Biochemistry , University of California, San Diego , La Jolla, San Diego , California 92093-0358 , United States
| | - Ryan L Holland
- Department of Chemistry and Biochemistry , University of California, San Diego , La Jolla, San Diego , California 92093-0358 , United States
| | - Kevin D Bunker
- Department of Chemistry and Biochemistry , University of California, San Diego , La Jolla, San Diego , California 92093-0358 , United States
| | - Joseph M O'Connor
- Department of Chemistry and Biochemistry , University of California, San Diego , La Jolla, San Diego , California 92093-0358 , United States
| | - Kim K Baldridge
- School of Pharmaceutical Science and Technology , Tianjin University , 92 Weijin Road , Nankai District, Tianjin 300072 , P. R. of China
| | - Arnold L Rheingold
- Department of Chemistry and Biochemistry , University of California, San Diego , La Jolla, San Diego , California 92093-0358 , United States
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Zhou X, Huang F, Tang C, Zhuo Q, Chen Z, Zhang H, Xia H. A missing member of conjugated N-heterocycles: realizing pyrido[1,2-α]azepine by reacting ruthenium alkenylcarbene complex with alkyne. Chem Commun (Camb) 2018; 54:4009-4012. [PMID: 29617019 DOI: 10.1039/c8cc00758f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Despite the excellent chemical properties of N-heterocycles, pyrido[1,2-α]azepine remains elusive due to its potential antiaromaticity and lability. Herein, we demonstrate the synthesis and characterization of the first bicyclic pyrido[1,2-α]azepine that leverages the coordination to the ruthenium center to promote the stability of N-bridged bicycle.
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Affiliation(s)
- Xiaoxi Zhou
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
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Lee GM, Leung ASC, Harrison DJ, Korobkov I, Hughes RP, Baker RT. Experimental and Computational Evidence for 1,4-Diradical Intermediates in Reactions of Cobalt Fluorocarbene Complexes with Terminal Aryl-alkynes to give Metallacyclobutenes. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00344] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Graham M. Lee
- Department
of Chemistry and Biomolecular Sciences and Centre for Catalysis Research
and Innovation, University of Ottawa, 30 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Alicia S. C. Leung
- Department
of Chemistry and Biomolecular Sciences and Centre for Catalysis Research
and Innovation, University of Ottawa, 30 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Daniel J. Harrison
- Department
of Chemistry and Biomolecular Sciences and Centre for Catalysis Research
and Innovation, University of Ottawa, 30 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Ilia Korobkov
- Department
of Chemistry and Biomolecular Sciences and Centre for Catalysis Research
and Innovation, University of Ottawa, 30 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
| | - Russell P. Hughes
- Department
of Chemistry, Dartmouth College, Hanover, New Hampshire 03755, United States
| | - R. Tom Baker
- Department
of Chemistry and Biomolecular Sciences and Centre for Catalysis Research
and Innovation, University of Ottawa, 30 Marie Curie, Ottawa, Ontario K1N 6N5, Canada
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Zhao J, Zhang S, Zhang WX, Xi Z. Coordination-induced skeletal rearrangements of zirconacyclobutene–silacyclobutene fused complexes. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2013.08.032] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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5
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Synthesis of the cobalt–alkyne complex (η5-C5H5)(PPh3)Co{η2-(Me3Si)CC(CO2Et)} and structural characterization of trimethylsilyl substituted cobaltacyclopentadiene complexes derived therefrom. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2013.09.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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O’Connor JM, Baldridge KK, Vélez CL, Rheingold AL, Moore CE. Chemistry at the Alkyne–Carbene Intersection: A Metallacyclobutene−η3-Vinylcarbene Equilibration. J Am Chem Soc 2013; 135:8826-9. [DOI: 10.1021/ja4039483] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Joseph M. O’Connor
- Department of Chemistry, University of California, San Diego, La Jolla, California
92093, United States
| | - Kim K. Baldridge
- Institute
of Organic Chemistry, University of Zürich, Winterthurerstrasse 190,
CH-8057 Zürich, Switzerland
| | - Carmen L. Vélez
- Department of Chemistry, University of California, San Diego, La Jolla, California
92093, United States
| | - Arnold L. Rheingold
- Department of Chemistry, University of California, San Diego, La Jolla, California
92093, United States
| | - Curtis E. Moore
- Department of Chemistry, University of California, San Diego, La Jolla, California
92093, United States
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O’Connor JM, Chen MC, Holland RL, Rheingold AL. Addition of Dissimilar Carbenes across an Unsymmetrically Substituted Alkyne: Regio- and Stereoselective Synthesis of Trisubstituted 1,3-Dienes. Organometallics 2011. [DOI: 10.1021/om1007314] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Joseph M. O’Connor
- Department of Chemistry and Biochemistry (0358), University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - Ming-Chou Chen
- Department of Chemistry and Biochemistry (0358), University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
- Department of Chemistry, National Central University, Chung-Li, Taiwan 32054, Republic of China
| | - Ryan L. Holland
- Department of Chemistry and Biochemistry (0358), University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
| | - Arnold L. Rheingold
- Department of Chemistry and Biochemistry (0358), University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093-0358, United States
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The Isolation of a Large Cyclopentadienylcobaltsulfide Cluster. The Synthesis and Crystal Structure of Octahedral closo-(η5-C5H5Co)5S. J CLUST SCI 2009. [DOI: 10.1007/s10876-009-0234-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Holland RL, O’Connor JM. Nitroso Compounds Serve as Precursors to Late-Metal η2(N,O)-Hydroxylamido Complexes. Organometallics 2008. [DOI: 10.1021/om801105x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ryan L. Holland
- Department of Chemistry and Biochemistry 0358, University of California, San Diego, La Jolla, California 92093-0358
| | - Joseph M. O’Connor
- Department of Chemistry and Biochemistry 0358, University of California, San Diego, La Jolla, California 92093-0358
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Goswami A, Maier CJ, Pritzkow H, Siebert W. Cobalt-mediated oligomerization reactions of amino-substituted acetylene derivatives. J Organomet Chem 2005. [DOI: 10.1016/j.jorganchem.2005.03.056] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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11
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Donovan-Merkert BT, Malik J, Gray LV, O'Connor JM, Fong BS, Chen MC. Electrochemistry Studies of a Metallacyclobutene Complex: Synthesis of a Furan Product by Oxidation of a Cobaltacyclobutene. Organometallics 1998. [DOI: 10.1021/om970594n] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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12
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O'Connor JM, Chen MC, Fong BS, Wenzel A, Gantzel P, Rheingold AL, Guzei IA. Conversion of a Metallacyclobutene to Cobalt−Allene Complexes. J Am Chem Soc 1998. [DOI: 10.1021/ja9735259] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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O'Connor JM, Chen MC, Rheingold AL. Fluoride induced isomerization of cobalt diene complexes. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)01145-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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