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Mullins JC, Yuvaraj K, Sowden MJ, Sherburn MS, Jones C. Reductive Metallation of Dendralenes and Myrcene Using Dimagnesium(I) Compounds: A Facile Route to Unsaturated Organomagnesium Compounds. Chemistry 2024; 30:e202303219. [PMID: 37985926 DOI: 10.1002/chem.202303219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2023] [Revised: 11/17/2023] [Accepted: 11/17/2023] [Indexed: 11/22/2023]
Abstract
The two-electron reduction of 2,3-dimethylbuta-1,3-diene (DMB) with β-diketiminate and guanidinate substituted dimagnesium(I) compounds has given complexes in which two bidentate amido-magnesium fragments are bridged through the π-system of the DMB dianion, viz. [(LMg)2 (μ-DMB)] (L=Xyl Nacnac, [HC(MeCNXyl)2 ]- , Xyl=2,6-xylyl; or Priso=[(DipN)2 CNPri 2 ]- , Dip=2,6-diisopropylphenyl). Similar double reductions of [4]dendralene (4dend) have afforded the complexes, [(LMg)2 (μ-4dend)] (L=Ar Nacnac, Ar=Xyl or mesityl (Mes); or Priso) in which the 4dend dianion is π-coordinated to the bidentate amido-magnesium fragments. Treatment of several such complexes with THF leads to Z- to E-isomerization of the dendralene fragment, and formation of purely σ-bonded Mg-C interactions in the THF coordinated products [{(Ar Nacnac)(THF)Mg}2 (μ-4dend)] (Ar=Xyl, Mes or Dip). Reaction of myrcene (Myr) with [{(Xyl Nacnac)Mg}2 ] proceeds via reductive coupling of Myr to give a previously unknown acyclic, branched C20 tetra-olefin dianion complex [{(Xyl Nacnac)(THF)Mg}2 (μ-Myr)2 ]. Preliminary reactions of [(LMg)2 (μ-DMB)] with H2 and/or CO yielded a series of products, including novel magnesium hydride compounds, products derived from couplings of CO with the reduced DMB fragment (viz. magnesium dimethylcyclohexadienediolates), and one magnesium cyclopropanetriolate complex from the magnesium(I) induced coupling of DMB with H2 and CO.
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Affiliation(s)
- Jeremy C Mullins
- School of Chemistry, Monash University, PO Box 23, Melbourne, VIC, 3800, Australia
| | - K Yuvaraj
- School of Chemistry, Monash University, PO Box 23, Melbourne, VIC, 3800, Australia
| | - Madison J Sowden
- Research School of Chemistry, Australian National University, Acton, ACT, 2601, Australia
| | - Michael S Sherburn
- Research School of Chemistry, Australian National University, Acton, ACT, 2601, Australia
| | - Cameron Jones
- School of Chemistry, Monash University, PO Box 23, Melbourne, VIC, 3800, Australia
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Desfeux C, Besnard C, Mazet C. [ n]Dendralenes as a Platform for Selective Catalysis: Ligand-Controlled Cu-Catalyzed Chemo-, Regio-, and Enantioselective Borylations. Org Lett 2020; 22:8181-8187. [PMID: 32559086 DOI: 10.1021/acs.orglett.0c01892] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report the development of two complementary methods for the Cu-catalyzed anti-Markovnikov borylation of one specific olefin in 2-substituted [n]dendralenes (n = 3-6). The first protocol operates with a bisphosphine ligand and occurs with high regio- and chemoselectivity for the terminal double bond, independently of the number of cross-conjugated alkenes. We show that the use of a chiral phosphanamine ligand enables the highly chemo-, regio-, and enantioselective borylation of the alkene cross-conjugated with the terminal olefin in [n]dendralenes.
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Affiliation(s)
- Camille Desfeux
- Department of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, 1211 Geneva, Switzerland
| | - Céline Besnard
- Laboratory of Crystallography, University of Geneva, 24 quai Ernest Ansermet, 1211 Geneva, Switzerland
| | - Clément Mazet
- Department of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, 1211 Geneva, Switzerland
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Chaves-Pouso A, Rivera-Chao E, Fañanás-Mastral M. Copper-catalyzed protoboration of borylated dendralenes: a regio- and stereoselective access to functionalized 1,3-dienes. Chem Commun (Camb) 2020; 56:12230-12233. [PMID: 32926014 DOI: 10.1039/d0cc04018e] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A copper-catalyzed protoboration of borylated dendralenes is reported. The method employs an NHC-Cu catalyst and provides access to 1,4-addition products with excellent levels of chemo-, regio- and stereoselectivity. The resulting diene bis(boronates) are oxidized to the corresponding diene diols which are synthetically versatile building blocks.
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Affiliation(s)
- Andrea Chaves-Pouso
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS), Departamento de Química Orgánica, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain.
| | - Eva Rivera-Chao
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS), Departamento de Química Orgánica, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain.
| | - Martín Fañanás-Mastral
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS), Departamento de Química Orgánica, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain.
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Naidu VR, Bäckvall JE. Synthesis of Cross-Conjugated Polyenes via Palladium-Catalyzed Oxidative C-C Bond Forming Cascade Reactions of Allenes. J Org Chem 2020; 85:5428-5437. [PMID: 32207975 PMCID: PMC7311062 DOI: 10.1021/acs.joc.0c00186] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
An efficient palladium-catalyzed oxidative C-C bond forming cascade reaction of allenes involving a coupling between an enallene and an allenyne followed by a carbocyclization of the generated Pd-intermediate was developed. This cascade reaction afforded functionalized cross-conjugated polyenes. The enallene is initially activated by palladium and reacts with the allenyne to give the cross-conjugated polyenes.
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Affiliation(s)
- Veluru Ramesh Naidu
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden.,Department of Natural Sciences, Mid Sweden University, Holmgatan 10, SE-851 79, Sundsvall, Sweden
| | - Jan-E Bäckvall
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden.,Department of Natural Sciences, Mid Sweden University, Holmgatan 10, SE-851 79, Sundsvall, Sweden
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Rivera-Chao E, Fañanás-Mastral M. Synthesis of Stereodefined Borylated Dendralenes through Copper-Catalyzed Allylboration of Alkynes. Angew Chem Int Ed Engl 2018; 57:9945-9949. [DOI: 10.1002/anie.201806334] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Eva Rivera-Chao
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS); Departamento de Química Orgánica; Universidade de Santiago de Compostela; 15782 Santiago de Compostela Spain
| | - Martín Fañanás-Mastral
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS); Departamento de Química Orgánica; Universidade de Santiago de Compostela; 15782 Santiago de Compostela Spain
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Rivera-Chao E, Fañanás-Mastral M. Synthesis of Stereodefined Borylated Dendralenes through Copper-Catalyzed Allylboration of Alkynes. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201806334] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Eva Rivera-Chao
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS); Departamento de Química Orgánica; Universidade de Santiago de Compostela; 15782 Santiago de Compostela Spain
| | - Martín Fañanás-Mastral
- Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS); Departamento de Química Orgánica; Universidade de Santiago de Compostela; 15782 Santiago de Compostela Spain
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Liu N, Yu S, Ding Y. Theoretical study on [3]- and [4]radialene complexes CpM(C 2n H 2n ) (n = 3, 4; M = Sc∼Ni): Special metal-aromatic interaction along with metal-alkene bonds. J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2016.11.023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Saglam MF, Fallon T, Paddon-Row MN, Sherburn MS. Discovery and Computational Rationalization of Diminishing Alternation in [n]Dendralenes. J Am Chem Soc 2016; 138:1022-32. [PMID: 26721640 DOI: 10.1021/jacs.5b11889] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The [n]dendralenes are a family of acyclic hydrocarbons which, by virtue of their ability to rapidly generate structural complexity, have attracted significant recent synthetic attention. [3]Dendralene through [8]dendralene have been previously prepared but no higher member of the family has been reported to date. Here, we describe the first chemical syntheses of the "higher" dendralenes, [9]dendralene through [12]dendralene. We also report a detailed investigation into the spectroscopic properties and chemical reactivity of the complete family of fundamental hydrocarbons, [3]dendralene to [12]dendralene. These studies reveal the first case of diminishing alternation in behavior in a series of related structures. We also report a comprehensive series of computational studies, which trace this dampening oscillatory effect in both spectroscopic measurements and chemical reactivity to conformational preferences.
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Affiliation(s)
- Mehmet F Saglam
- Research School of Chemistry, Australian National University , Canberra, Australian Capital Territory 2601, Australia
| | - Thomas Fallon
- Research School of Chemistry, Australian National University , Canberra, Australian Capital Territory 2601, Australia
| | - Michael N Paddon-Row
- School of Chemistry, The University of New South Wales , Sydney, New South Wales 2052, Australia
| | - Michael S Sherburn
- Research School of Chemistry, Australian National University , Canberra, Australian Capital Territory 2601, Australia
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Mackay EG, Newton CG, Toombs-Ruane H, Lindeboom EJ, Fallon T, Willis AC, Paddon-Row MN, Sherburn MS. [5]Radialene. J Am Chem Soc 2015; 137:14653-9. [DOI: 10.1021/jacs.5b07445] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Emily G. Mackay
- Research
School of Chemistry, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Christopher G. Newton
- Research
School of Chemistry, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Henry Toombs-Ruane
- Research
School of Chemistry, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Erik Jan Lindeboom
- Research
School of Chemistry, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Thomas Fallon
- Research
School of Chemistry, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Anthony C. Willis
- Research
School of Chemistry, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - Michael N. Paddon-Row
- School
of Chemistry, The University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Michael S. Sherburn
- Research
School of Chemistry, Australian National University, Canberra, Australian Capital Territory 2601, Australia
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Abstract
The two simplest branched acyclic structures comprising only conjugated C═C units, namely, [3]dendralene (3-methylene-1,4-pentadiene) and [4]dendralene (3,4-dimethylene-1,5-hexadiene), were first reported in 1955 and 1962, respectively. No higher members of the series were described in the literature until 2000. This Account describes the modern phase of dendralene chemistry, driven to a large extent by research performed within the author's group. The first synthesis of the parent dendralene family allowed access to the hydrocarbons in batches of up to 5 mg. The synthetic approach took into account the prevailing dogma of the time, specifically that these compounds would be very reactive species and hence difficult to handle in the laboratory. As such, a route involving the cheleotropic elimination of SO2 from stable, and generally insoluble, 3-sulfolene-masked precursors was devised. Our second-generation approach was of significantly higher value in preparative terms, allowing the syntheses of the first six members of the unsubstituted [n]dendralenes (i.e., n = 3-8) directly, on scales of hundreds of milligrams to decagrams, using commercially available precursors and standard laboratory equipment and methods. This work demonstrated that the assumed high reactivity and instability this family of compounds was erroneous and ultimately led to the development of syntheses of structurally related cross-conjugated systems including substituted dendralenes, tetravinylethylene, 1,1-divinylallene, and furan-containing analogues of the dendralenes. Cross-coupling reactions feature strongly in the syntheses of these compounds, and methods involving single- to multifold Stille, Kumada, and Negishi couplings are mainstays of this work. The even parity [n]dendralenes were shown to exhibit enhanced stability over the odd parity congeners, a result that can be attributed to conformational effects. π-Bond-rich branched hydrocarbons are demonstrated to have significant value in the rapid generation of structural complexity. Pericyclic processes are particularly useful in this regard, with the dendralenes and their relatives serving as multidienes, participating in diene-transmissive cycloaddition sequences, sometimes in combination with electrocyclizations, to generate fused and bridged multicyclic systems containing many new covalent bonds. The outcomes of exploratory investigations into pericyclic sequences involving dendralenes are presented, along with methods developed to control chemoselectivity, regioselectivity, and stereoselectivity. Distinct from their use in diene-transmissive sequences, the dendralenes also serve as multialkenes, for the direct synthesis of polyols and oligo-cyclopropanes. Finally, the deployment of π-bond-rich branched hydrocarbons in the shortest total synthesis of a pseudopterosin natural product is summarized, as a prelude to future prospects in the areas of hydrocarbon chemistry and target synthesis.
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Affiliation(s)
- Michael S. Sherburn
- Research School of Chemistry, Australian National University, Canberra, Australian Capital Territory 2601, Australia
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11
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Herndon JW. The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2011. Coord Chem Rev 2013. [DOI: 10.1016/j.ccr.2013.05.011] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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12
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Abstract
We present herein an overview of our ongoing studies with dendralenes. The first synthetic routes to this fundamental family of compounds have revealed long-hidden secrets in hydrocarbon chemistry and set the scene for synthetic and materials chemistry applications.
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Bruce MI, Skelton BW, Zaitseva NN. A Ruthenated [3]Dendralene from Phenylethyne and an η3-Butadienyl–Ruthenium Complex. Organometallics 2012. [DOI: 10.1021/om300366g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Michael I. Bruce
- School of Chemistry & Physics, University of Adelaide, South Australia 5005, Australia
| | - Brian W. Skelton
- Centre for Microscopy, Characterisation and
Analysis, University of Western Australia, Crawley, Western Australia 6009, Australia
| | - Natasha N. Zaitseva
- School of Chemistry & Physics, University of Adelaide, South Australia 5005, Australia
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Hopf H, Sherburn MS. Dendralene auf dem Vormarsch: kreuzkonjugierte Oligoene ermöglichen den schnellen Aufbau molekularer Komplexität. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201102987] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Hopf H, Sherburn MS. Dendralenes Branch Out: Cross-Conjugated Oligoenes Allow the Rapid Generation of Molecular Complexity. Angew Chem Int Ed Engl 2012; 51:2298-338. [DOI: 10.1002/anie.201102987] [Citation(s) in RCA: 134] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2011] [Revised: 09/12/2011] [Indexed: 11/11/2022]
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Toombs-Ruane H, Pearson EL, Paddon-Row MN, Sherburn MS. On the Diels–Alder dimerisation of cross-conjugated trienes. Chem Commun (Camb) 2012; 48:6639-41. [DOI: 10.1039/c2cc32520a] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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