1
|
Shiri F, Ariafard A. Factors Influencing the Chemoselectivity of Pd(OAc) 2 -Catalyzed Cyclization Reactions Involving 1,6- Enynes as a Substrate and PhI(OAc) 2 as a Reagent. Chemistry 2023; 29:e202300115. [PMID: 37013931 DOI: 10.1002/chem.202300115] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Indexed: 04/05/2023]
Abstract
It is well documented in the literature that 1,6-enynes are cyclized using PhI(OAc)2 (PIDA) in the presence of Pd(OAc)2 as a catalyst to yield cyclopropyl ketones. In contrast, it has been reported that when 1,6-enynes are substituted by a hydroxy group at the α-position to the alkyne, the chemoselectivity of the cyclization reaction is altered, and polycyclic oxa-heterocycles are formed. This suggests that the hydroxy substituent plays a crucial role in changing the mechanism of the reaction. The aim of this study is to use density functional theory (DFT) calculations at the SMD/M06-D3/def2TZVP//SMD/M06/SDD,6-31G(d) level of theory to shed light on the reason for this change by investigating the detailed mechanistic aspects of these transformations. This study demonstrates that the electronic nature of the Pd catalyst changes from π-philicity to oxophilicity during the catalytic cycle, and this change plays an essential role in controlling the chemoselectivity of the cyclization reactions. In addition, it was found that (1) the hypervalent iodine reagent PIDA serves not only as an oxidant for the oxidation of Pd(II) to Pd(IV), but also as a nucleophile that drives the acetoxypalladation step of the reaction, (2) the oxidation of Pd(II) to Pd(IV) by the iodonium ion [PhIOAc]+ occurs via an interesting mechanism involving coordination of [PhIOAc]+ to the Pd(II) centre, followed by a twist in the hypervalent iodine, and (3) Pd π-complexes are not very susceptible to oxidation. (4) A Pd(II) complex can be six coordinate if the Pd centre is partially oxidized.
Collapse
Affiliation(s)
- Farshad Shiri
- Department of Chemistry, Islamic Azad University, Central, Tehran Branch, Poonak, Tehran, 1469669191, Iran
| | - Alireza Ariafard
- Department of Chemistry, Islamic Azad University, Central, Tehran Branch, Poonak, Tehran, 1469669191, Iran
- School of Natural Sciences (Chemistry), University of Tasmania, Private Bag 75, Hobart, TAS, 7001, Australia
| |
Collapse
|
2
|
Zhi S, Yao H, Zhang W. Difunctionalization of Dienes, Enynes and Related Compounds via Sequential Radical Addition and Cyclization Reactions. Molecules 2023; 28:molecules28031145. [PMID: 36770814 PMCID: PMC9919800 DOI: 10.3390/molecules28031145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 01/18/2023] [Accepted: 01/19/2023] [Indexed: 01/26/2023] Open
Abstract
Radical reactions are powerful in creating carbon-carbon and carbon-heteroatom bonds. Designing one-pot radical reactions with cascade transformations to assemble the cyclic skeletons with two new functional groups is both synthetically and operationally efficient. Summarized in this paper is the recent development of reactions involving radical addition and cyclization of dienes, diynes, enynes, as well as arene-bridged and arene-terminated compounds for the preparation of difunctionalization cyclic compounds. Reactions carried out with radical initiators, transition metal-catalysis, photoredox, and electrochemical conditions are included.
Collapse
Affiliation(s)
- Sanjun Zhi
- Jiangsu Key Laboratory for the Chemistry of Low-Dimensional Materials, Huaiyin Normal University, Huai’an 223300, China
| | - Hongjun Yao
- College of Biological Science and Technology, Beijing Forestry University, 35 Qinghua East Road, Beijing 100083, China
| | - Wei Zhang
- Department of Chemistry, University of Massachusetts Boston, 100 Morrissey Boulevard, Boston, MA 02125, USA
- Correspondence: ; Tel.: +1-617-287-6147
| |
Collapse
|
3
|
Jos S, Szwetkowski C, Slebodnick C, Ricker R, Chan KL, Chan WC, Radius U, Lin Z, Marder TB, Santos WL. Transition Metal-Free Regio- and Stereo-Selective trans Hydroboration of 1,3-Diynes: A Phosphine-Catalyzed Access to (E)-1-Boryl-1,3- Enynes. Chemistry 2022; 28:e202202349. [PMID: 35917135 PMCID: PMC9804376 DOI: 10.1002/chem.202202349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Indexed: 01/05/2023]
Abstract
We report a transition metal-free, regio- and stereo-selective, phosphine-catalyzed method for the trans hydroboration of 1,3-diynes with pinacolborane that affords (E)-1-boryl-1,3-enynes. The reaction proceeds with excellent selectivity for boron addition to the external carbon of the 1,3-diyne framework as unambiguously established by NMR and X-ray crystallographic studies. The reaction displays a broad substrate scope including unsymmetrical diynes to generate products in high yield (up to 95 %). Experimental and theoretical studies suggest that phosphine attack on the alkyne is a key process in the catalytic cycle.
Collapse
Affiliation(s)
- Swetha Jos
- Department of ChemistryVirginia TechBlacksburgVirginiaUnited States
| | | | - Carla Slebodnick
- Department of ChemistryVirginia TechBlacksburgVirginiaUnited States
| | - Robert Ricker
- Institute of Inorganic ChemistryInstitute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgGermany
| | - Ka Lok Chan
- Department of ChemistryThe Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong SARChina
| | - Wing Chun Chan
- Department of ChemistryThe Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong SARChina
| | - Udo Radius
- Institute of Inorganic ChemistryInstitute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgGermany
| | - Zhenyang Lin
- Department of ChemistryThe Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong SARChina
| | - Todd B. Marder
- Institute of Inorganic ChemistryInstitute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgGermany
| | | |
Collapse
|
4
|
Nagireddy A, Dattatri, Babu Nanubolu J, Sridhar Reddy M. Diastereoselective [2+2+1] Hydrative Annulation of Phenol-Linked 1,6- Enynes with Acetylenes Through Rhodium Catalysis: A Rapid Access to Cyclopenta[b]benzofuranols. Chemistry 2021; 27:17570-17575. [PMID: 34636111 DOI: 10.1002/chem.202102930] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Indexed: 12/18/2022]
Abstract
An unprecedented [2+2+1] hydrative annulation of 1,6-enynes with terminal alkynes is achieved using catalytic cationic Rh(I). Thus, a modular assembly of cyclopenta[b]benzofuranols with two consecutive quarternary stereocenters is achieved from readily available alkynes. The reaction is proposed to go through a sequence of 5-membered rhoda-cycle formation, regioselective acetylene insertion, 1,5 H-shift, substrate controlled stereoselective addition of water molecule followed by 1,2-rhodium migration gave contracted rhoda-cycle D and reductive elimination. Necessary control/labelling experiments were conducted to gain insight in to the mechanism.
Collapse
Affiliation(s)
- Attunuri Nagireddy
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India.,Academy of Scientific and Innovative Research, Ghaziabad, 201002, India
| | - Dattatri
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India.,Academy of Scientific and Innovative Research, Ghaziabad, 201002, India
| | - Jagadeesh Babu Nanubolu
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India.,Analytical Department, CSIR-IICT, Hyderabad, 500007, India
| | - Maddi Sridhar Reddy
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India.,Academy of Scientific and Innovative Research, Ghaziabad, 201002, India
| |
Collapse
|
5
|
Wang Z, Wu J, Lamine W, Li B, Sotiropoulos JM, Chrostowska A, Miqueu K, Liu SY. C-Boron Enolates Enable Palladium Catalyzed Carboboration of Internal 1,3- Enynes. Angew Chem Int Ed Engl 2021; 60:21231-21236. [PMID: 34245074 DOI: 10.1002/anie.202108534] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2021] [Indexed: 12/17/2022]
Abstract
A new family of carbon-bound boron enolates, generated by a kinetically controlled halogen exchange between chlorocatecholborane and silylketene acetals, is described. These C-boron enolates are demonstrated to activate 1,3-enyne substrates in the presence of a Pd0 /Senphos ligand complex, resulting in the first examples of a carboboration reaction of an alkyne with enolate-equivalent nucleophiles. Highly substituted dienyl boron building blocks are produced in excellent site-, regio-, and diastereoselectivity by the described catalytic cis-carboboration reaction.
Collapse
Affiliation(s)
- Ziyong Wang
- Department of Chemistry, Boston College, Chestnut Hill, MA, 02467, USA
| | - Jason Wu
- Department of Chemistry, Boston College, Chestnut Hill, MA, 02467, USA
| | - Walid Lamine
- Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, UMR 5254, 64053, Pau cedex 09, France
| | - Bo Li
- Department of Chemistry, Boston College, Chestnut Hill, MA, 02467, USA
| | - Jean-Marc Sotiropoulos
- Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, UMR 5254, 64053, Pau cedex 09, France
| | - Anna Chrostowska
- Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, UMR 5254, 64053, Pau cedex 09, France
| | - Karinne Miqueu
- Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, UMR 5254, 64053, Pau cedex 09, France
| | - Shih-Yuan Liu
- Department of Chemistry, Boston College, Chestnut Hill, MA, 02467, USA.,Université de Pau et des Pays de l'Adour, E2S UPPA, CNRS, IPREM, UMR 5254, 64053, Pau cedex 09, France
| |
Collapse
|
6
|
Herbort JH, Lalisse RF, Hadad CM, RajanBabu TV. Cationic Co(I) Catalysts for Regiodivergent Hydroalkenylation of 1,6-Enynes. An Uncommon cis-β-C-H Activation Leads to Z-Selective Coupling of Acrylates. ACS Catal 2021; 11:9605-9617. [PMID: 34745711 DOI: 10.1021/acscatal.1c02530] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Two intermolecular hydroalkenylation reactions of 1,6-enynes are presented which yield substituted 5-membered carbo- and -heterocycles. This reactivity is enabled by a cationic bis-diphenylphosphinopropane (DPPP)CoI species which forms a cobaltacyclopentene intermediate by oxidative cyclization of the enyne. This key species interacts with alkenes in distinct fashion, depending on the identity of the coupling partner to give regiodivergent products. Simple alkenes undergo insertion reactions to furnish 1,3-dienes whereby one of the alkenes is tetrasubstituted. When acrylates are employed as coupling partners, the site of intermolecular C-C formation shifts from the alkyne to the alkene motif of the enyne, yielding Z-substituted-acrylate derivatives. Computational studies provide support for our experimental observations and show that the turnover-limiting steps in both reactions are the interactions of the alkenes with the cobaltacyclopentene intermediate via either a 1,2-insertion in the case of ethylene, or an unexpected β-C-H activation in the case of most acrylates. Thus, the H syn to the ester is activated through the coordination of the acrylate carbonyl to the cobaltacycle intermediate, which explains the uncommon Z-selectivity and regiodivergence. Variable time normalization analysis (VTNA) of the kinetic data reveals a dependance upon the concentration of cobalt, acrylate, and activator. A KIE of 2.1 was observed with methyl methacrylate in separate flask experiments, indicating that C-H cleavage is the turnover-limiting step in the catalytic cycle. Lastly, a Hammett study of aryl-substituted enynes yields a ρ value of -0.4, indicating that more electron-rich substituents accelerate the rate of the reaction.
Collapse
Affiliation(s)
- James H. Herbort
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Remy F. Lalisse
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - Christopher M. Hadad
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| | - T. V. RajanBabu
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, United States
| |
Collapse
|
7
|
Ogawa N, Sone S, Hong S, Lu Y, Kobayashi Y. Synthesis of Two Stereoisomers of Potentially Bioactive 13,19,20-Trihydroxy Derivative of Docosahexaenoic Acid. Synlett 2020; 31:1735-1739. [PMID: 35023886 DOI: 10.1055/s-0040-1706415] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
The C16-C22 fragment with the acetylene terminus was constructed through the asymmetric dihydroxylation of the corresponding olefin, while the 15-iodo-olefin corresponding to the C11-C15 part was prepared via the asymmetric transfer hydrogenation of the corresponding acetylene ketone followed by hydrozirconation/iodination. Both pieces were joined by a Sonogashira coupling, and the product was further converted into the title compound via a Wittig reaction with the remaining C1-C10 segment and Boland reduction using Zn with TMSCl.
Collapse
Affiliation(s)
- Narihito Ogawa
- Department of Applied Chemistry, Meiji University, 1-1-1, Higashimita, Tama-ku, Kawasaki, Kanagawa 214-8571, Japan
| | - Shinsaku Sone
- Department of Applied Chemistry, Meiji University, 1-1-1, Higashimita, Tama-ku, Kawasaki, Kanagawa 214-8571, Japan
| | - Song Hong
- Neuroscience Center of Excellence, Louisiana State University, Health Sciences Center, 2020 Gravier St., New Orleans, LA 70112, USA.,Department of Ophthalmology, Louisiana State University, Health Sciences Center, New Orleans, LA 70112, USA
| | - Yan Lu
- Neuroscience Center of Excellence, Louisiana State University, Health Sciences Center, 2020 Gravier St., New Orleans, LA 70112, USA
| | - Yuichi Kobayashi
- Meiji University, Organization for the Strategic Coordination of Research and Intellectual Properties, 1-1-1 Higashimita, Tama-ku, Kawasaki, Kanagawa 214-8571, Japan
| |
Collapse
|
8
|
Abstract
The first trans-selective cyanoboration reaction of an alkyne, specifically a 1,3-enyne, is described. The reported palladium-catalyzed cyanoboration of 1,3-enynes is site-, regio-, and diastereoselective, and is uniquely enabled by the 1,4-azaborine-based Senphos ligand structure. Tetra-substituted alkenyl nitriles are obtained providing useful boron-dienenitrile building blocks that can be further functionalized. The utility of our method has been demonstrated with the synthesis of Satigrel, an anti-platelet aggregating agent.
Collapse
Affiliation(s)
- Yuanzhe Zhang
- Department of Chemistry, Boston College, Chestnut Hill, MA, 02467-3860, USA
| | - Bo Li
- Department of Chemistry, Boston College, Chestnut Hill, MA, 02467-3860, USA
| | - Shih-Yuan Liu
- Department of Chemistry, Boston College, Chestnut Hill, MA, 02467-3860, USA
| |
Collapse
|
9
|
Escorihuela J, Sedgwick DM, Llobat A, Medio-Simón M, Barrio P, Fustero S. Pauson-Khand reaction of fluorinated compounds. Beilstein J Org Chem 2020; 16:1662-1682. [PMID: 32733610 PMCID: PMC7372243 DOI: 10.3762/bjoc.16.138] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Accepted: 07/02/2020] [Indexed: 12/11/2022] Open
Abstract
The Pauson-Khand reaction (PKR) is one of the key methods for the construction of cyclopentenone derivatives, which can in turn undergo diverse chemical transformations to yield more complex biologically active molecules. Despite the increasing availability of fluorinated building blocks and methodologies to incorporate fluorine in compounds with biological interest, there have been few significant advances focused on the fluoro-Pauson-Khand reaction, both in the inter- and intramolecular versions. Furthermore, the use of vinyl fluorides as olefinic counterparts had been completely overlooked. In this review, we collect the advances both on the stoichiometric and catalytic intermolecular and intramolecular fluoro-Pauson-Khand reaction, with special attention to the PKR of enynes containing a fluoride moiety.
Collapse
Affiliation(s)
- Jorge Escorihuela
- Departamento de Química Orgánica, Facultad de Farmacia, Universitat de València, Av. Vicent Andrés Estellés s/n, 46100 Burjassot, Valencia, Spain
| | - Daniel M Sedgwick
- Departamento de Química Orgánica, Facultad de Farmacia, Universitat de València, Av. Vicent Andrés Estellés s/n, 46100 Burjassot, Valencia, Spain
| | - Alberto Llobat
- Departamento de Química Orgánica, Facultad de Farmacia, Universitat de València, Av. Vicent Andrés Estellés s/n, 46100 Burjassot, Valencia, Spain
| | - Mercedes Medio-Simón
- Departamento de Química Orgánica, Facultad de Farmacia, Universitat de València, Av. Vicent Andrés Estellés s/n, 46100 Burjassot, Valencia, Spain
| | - Pablo Barrio
- Departmento de Química Orgánica e Inorgánica, Facultad de Química, Universidad de Oviedo, Av. Julián Clavería 8, Campus Universitario de El Cristo, 33006 Oviedo, Spain
| | - Santos Fustero
- Departamento de Química Orgánica, Facultad de Farmacia, Universitat de València, Av. Vicent Andrés Estellés s/n, 46100 Burjassot, Valencia, Spain
| |
Collapse
|
10
|
Fuentespina RP, Garcia de la Cruz JA, Durin G, Mamane V, Weibel JM, Pale P. Borylation and rearrangement of alkynyloxiranes: a stereospecific route to substituted α- enynes. Beilstein J Org Chem 2019; 15:1416-1424. [PMID: 31293691 PMCID: PMC6604752 DOI: 10.3762/bjoc.15.141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Accepted: 06/07/2019] [Indexed: 12/05/2022] Open
Abstract
1,3-Enynes are important building blocks in organic synthesis and also constitute the key motif in various bioactive natural products and functional materials. However, synthetic approaches to stereodefined substituted 1,3-enynes remain a challenge, as they are limited to Wittig and cross-coupling reactions. Herein, stereodefined 1,3-enynes, including tetrasubstituted ones, were straightforwardly synthesized from cis or trans-alkynylated oxiranes in good to excellent yields by a one-pot cascade process. The procedure relies on oxirane deprotonation, borylation and a stereospecific rearrangement of the so-formed alkynyloxiranyl borates. This stereospecific process overall transfers the cis or trans-stereochemistry of the starting alkynyloxiranes to the resulting 1,3-enynes.
Collapse
Affiliation(s)
- Ruben Pomar Fuentespina
- Laboratoire de Synthèse, Réactivité Organiques & Catalyse, associé au CNRS, Institut de Chimie, Université de Strasbourg, 4 rue Blaise Pascal, 67000 Strasbourg, France
| | - José Angel Garcia de la Cruz
- Laboratoire de Synthèse, Réactivité Organiques & Catalyse, associé au CNRS, Institut de Chimie, Université de Strasbourg, 4 rue Blaise Pascal, 67000 Strasbourg, France
| | - Gabriel Durin
- Laboratoire de Synthèse, Réactivité Organiques & Catalyse, associé au CNRS, Institut de Chimie, Université de Strasbourg, 4 rue Blaise Pascal, 67000 Strasbourg, France
| | - Victor Mamane
- Laboratoire de Synthèse, Réactivité Organiques & Catalyse, associé au CNRS, Institut de Chimie, Université de Strasbourg, 4 rue Blaise Pascal, 67000 Strasbourg, France
| | - Jean-Marc Weibel
- Laboratoire de Synthèse, Réactivité Organiques & Catalyse, associé au CNRS, Institut de Chimie, Université de Strasbourg, 4 rue Blaise Pascal, 67000 Strasbourg, France
| | - Patrick Pale
- Laboratoire de Synthèse, Réactivité Organiques & Catalyse, associé au CNRS, Institut de Chimie, Université de Strasbourg, 4 rue Blaise Pascal, 67000 Strasbourg, France
| |
Collapse
|
11
|
Dooley JD, Lam HW. Corrigendum: One-Carbon Oxidative Annulations of 1,3- Enynes by Catalytic C-H Functionalization and 1,4-Rhodium(III) Migration. Chemistry 2018; 24:8692. [PMID: 29924442 DOI: 10.1002/chem.201802436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
12
|
Ma C, Letort A, Aouzal R, Wilkes A, Maiti G, Farrugia LJ, Ricard L, Prunet J. Cascade Metathesis Reactions for the Synthesis of Taxane and Isotaxane Derivatives. Chemistry 2016; 22:6891-8. [PMID: 27062670 PMCID: PMC4982030 DOI: 10.1002/chem.201600592] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2016] [Indexed: 12/28/2022]
Abstract
Tricyclic isotaxane and taxane derivatives have been synthesized by a very efficient cascade ring‐closing dienyne metathesis (RCDEYM) reaction, which formed the A and B rings in one operation. When the alkyne is present at C13 (with no neighboring gem‐dimethyl group), the RCEDYM reaction leads to 14,15‐isotaxanes 16 a,b and 18 b with the gem‐dimethyl group on the A ring. If the alkyne is at the C11 position (and thus flanked by a gem‐dimethyl group), RCEDYM reaction only proceeds in the presence of a trisubstituted olefin at C13, which disfavors the competing diene ring‐closing metathesis reaction, to give the tricyclic core of Taxol 44.
Collapse
Affiliation(s)
- Cong Ma
- Laboratoire de Synthèse Organique, CNRS UMR 7652, Ecole Polytechnique, DCSO, 91128, Palaiseau, France
| | - Aurélien Letort
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow, G12 8QQ, UK
| | - Rémi Aouzal
- Laboratoire de Synthèse Organique, CNRS UMR 7652, Ecole Polytechnique, DCSO, 91128, Palaiseau, France
| | - Antonia Wilkes
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow, G12 8QQ, UK
| | - Gourhari Maiti
- Laboratoire de Synthèse Organique, CNRS UMR 7652, Ecole Polytechnique, DCSO, 91128, Palaiseau, France
| | - Louis J Farrugia
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow, G12 8QQ, UK
| | - Louis Ricard
- Laboratoire de Chimie Moléculaire, CNRS UMR 9168, Ecole Polytechnique, LCM, 91128, Palaiseau, France
| | - Joëlle Prunet
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow, G12 8QQ, UK.
| |
Collapse
|
13
|
Burns DJ, Lam HW. Catalytic 1,4-rhodium(III) migration enables 1,3- enynes to function as one-carbon oxidative annulation partners in C-H functionalizations. Angew Chem Int Ed Engl 2014; 53:9931-5. [PMID: 25048465 PMCID: PMC4464529 DOI: 10.1002/anie.201406072] [Citation(s) in RCA: 135] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Indexed: 12/26/2022]
Abstract
1,3-Enynes containing allylic hydrogens cis to the alkyne are shown to act as one-carbon partners, rather than two-carbon partners, in various rhodium-catalyzed oxidative annulations. The mechanism of these unexpected transformations is proposed to occur through double C-H activation, involving a hitherto rare example of the 1,4-migration of a Rh(III) species. This phenomenon is general across a variety of substrates, and provides a diverse range of heterocyclic products.
Collapse
Affiliation(s)
- David J Burns
- School of Chemistry, University of Nottingham, University ParkNottingham, NG7 2RD (UK)
| | - Hon Wai Lam
- School of Chemistry, University of Nottingham, University ParkNottingham, NG7 2RD (UK)
| |
Collapse
|
14
|
Abstract
Herein, we report on our findings of the Sonogashira-Hagihara reaction with 1-iodinated and 2-brominated glycals using several aromatic and aliphatic alkynes. This Pd-catalyzed cross-coupling reaction presents a facile access to alkynyl C-glycosides and sets the stage for a reductive/oxidative refunctionalization of the enyne moiety to regenerate either C-glycosidic structures or pyran derivatives with a substituent in position 2.
Collapse
Affiliation(s)
- Dennis C Koester
- Institut für Organische und Biomolekulare Chemie, Georg-August-Universität Göttingen, Tammannstr. 2, 37077 Göttingen, Germany
| | - Daniel B Werz
- Institut für Organische und Biomolekulare Chemie, Georg-August-Universität Göttingen, Tammannstr. 2, 37077 Göttingen, Germany
| |
Collapse
|
15
|
Abstract
Conjugated 1,3-dienes are important building blocks in organic and polymer chemistry. Enyne metathesis is a powerful catalytic reaction to access such structural domains. Recent advances and developments in ene–yne cross-metathesis (EYCM) leading to various compounds of interest and their intermediates, that can directly be transformed in tandem procedures, are reviewed in this article. In addition, the use of bio-resourced olefinic substrates is presented.
Collapse
Affiliation(s)
- Cédric Fischmeister
- UMR 6226-CNRS-Université de Rennes 1, Sciences Chimiques de Rennes, Catalyse et Organométalliques, Campus de Beaulieu, 263 avenue du général Leclerc, 35042 Rennes cedex, France
| | | |
Collapse
|
16
|
Arimitsu S, Hammond GB. Synthesis of fluorinated δ-lactams via cycloisomerization of gem-difluoropropargyl amides. Beilstein J Org Chem 2010; 6:48. [PMID: 20563277 PMCID: PMC2887306 DOI: 10.3762/bjoc.6.48] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2010] [Accepted: 04/14/2010] [Indexed: 11/23/2022] Open
Abstract
gem-Difluoro-1,7-enyne amides are suitable building blocks for the synthesis of difluorodihydropyridinones via a ring-closing metathesis reaction, and of 4,4-difluoro-3-oxoisoquinolines through a ring-closing metathesis–enyne metathesis tandem reaction. These products, in turn, undergo a Diels–Alder reaction to yield heterotricyclic systems in moderate to good yields.
Collapse
|
17
|
Bower JF, Kim IS, Patman RL, Krische MJ. Catalytic carbonyl addition through transfer hydrogenation: a departure from preformed organometallic reagents. Angew Chem Int Ed Engl 2009; 48:34-46. [PMID: 19040235 PMCID: PMC2775511 DOI: 10.1002/anie.200802938] [Citation(s) in RCA: 260] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Classical protocols for carbonyl allylation, propargylation and vinylation typically rely upon the use of preformed allyl metal, allenyl metal and vinyl metal reagents, respectively, mandating stoichiometric generation of metallic byproducts. Through transfer hydrogenative C-C coupling, however, carbonyl addition may be achieved from the aldehyde or alcohol oxidation level in the absence of stoichiometric organometallic reagents or metallic reductants. Here, we review transfer hydrogenative methods for carbonyl addition, which encompass the first catalytic protocols enabling direct C-H functionalization of alcohols.
Collapse
Affiliation(s)
- John F. Bower
- University of Texas at Austin, Department of Chemistry and Biochemistry, 1 University Station – A5300, Austin, TX 78712-1167 (USA)
| | - In Su Kim
- University of Texas at Austin, Department of Chemistry and Biochemistry, 1 University Station – A5300, Austin, TX 78712-1167 (USA)
| | - Ryan L. Patman
- University of Texas at Austin, Department of Chemistry and Biochemistry, 1 University Station – A5300, Austin, TX 78712-1167 (USA)
| | - Michael J. Krische
- University of Texas at Austin, Department of Chemistry and Biochemistry, 1 University Station – A5300, Austin, TX 78712-1167 (USA)
| |
Collapse
|
18
|
Serra M, Piña B, Abad JL, Camps F, Fabriàs G. A multifunctional desaturase involved in the biosynthesis of the processionary moth sex pheromone. Proc Natl Acad Sci U S A 2007; 104:16444-9. [PMID: 17921252 PMCID: PMC2034215 DOI: 10.1073/pnas.0705385104] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2007] [Indexed: 11/18/2022] Open
Abstract
The sex pheromone of the female processionary moth, Thaumetopoea pityocampa, is a unique C16 enyne acetate that is biosynthesized from palmitic acid. Three consecutive desaturation reactions transform this saturated precursor into the triunsaturated fatty acyl intermediate: formation of (Z)-11-hexadecenoic acid, acetylenation to 11-hexadecynoic acid, and final Delta(13) desaturation to (Z)-13-hexadecen-11-ynoic acid. By using degenerate primers common to all reported insect desaturases, a single cDNA sequence was isolated from total RNA of T. pityocampa female pheromone glands. The full-length transcript of this putative desaturase was expressed in elo1Delta/ole1Delta yeast mutants (both elongase 1 and Delta(9) desaturase-deficient) for functional assays. The construct fully rescued the Deltaole1 yeast phenotype, confirming its desaturase activity. Analysis of the unsaturated products from transformed yeast extracts demonstrated that the cloned enzyme showed Delta(11) desaturase, Delta(11) acetylenase, and Delta(13) desaturase activities. Therefore, this single desaturase may account for the three desaturation steps involved in the sex pheromone biosynthetic pathway of the processionary moth.
Collapse
Affiliation(s)
- Montserrat Serra
- *Research Unit on BioActive Molecules (RUBAM), Departament de Química Orgànica Biològica, Institut d'Investigacions Químiques i Ambientals de Barcelona, and
| | - Benjamin Piña
- Departament de Biologia Molecular i Cellular, Institut de Biologia Molecular i Cellular de Barcelona, Consejo Superior de Investigaciones Científicas (CSIC), Jordi Girona 18, 08034 Barcelona, Spain
| | - José Luis Abad
- *Research Unit on BioActive Molecules (RUBAM), Departament de Química Orgànica Biològica, Institut d'Investigacions Químiques i Ambientals de Barcelona, and
| | - Francisco Camps
- *Research Unit on BioActive Molecules (RUBAM), Departament de Química Orgànica Biològica, Institut d'Investigacions Químiques i Ambientals de Barcelona, and
| | - Gemma Fabriàs
- *Research Unit on BioActive Molecules (RUBAM), Departament de Química Orgànica Biològica, Institut d'Investigacions Químiques i Ambientals de Barcelona, and
| |
Collapse
|