1
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Williams C, Nistanaki SK, Dong K, Lee W, Houk KN, Nelson HM. Main Group-Catalyzed Cationic Claisen Rearrangements via Vinyl Carbocations. Org Lett 2024; 26:4847-4852. [PMID: 38842928 PMCID: PMC11187624 DOI: 10.1021/acs.orglett.4c00837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2024] [Revised: 05/13/2024] [Accepted: 05/14/2024] [Indexed: 06/07/2024]
Abstract
We report a catalytic C-O coupling/Claisen cascade reaction enabled by interception of vinyl carbocations with allyl ethers. The reaction utilizes commercially available borate salts as catalysts and is effective at constructing sterically hindered C-C bonds. The reaction mechanism is studied experimentally and computationally to support a charge-accelerated [3,3] rearrangement of a silyloxonium cation. Our reaction is also applied to the highly stereoselective synthesis of fully substituted vinyl ethers.
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Affiliation(s)
- Chloe
G. Williams
- Division
of Chemistry and Chemical Engineering, California
Institute of Technology, Pasadena, California 91125, United States
| | - Sepand K. Nistanaki
- Division
of Chemistry and Chemical Engineering, California
Institute of Technology, Pasadena, California 91125, United States
| | - Krista Dong
- Division
of Chemistry and Chemical Engineering, California
Institute of Technology, Pasadena, California 91125, United States
| | - Woojin Lee
- Department
of Chemistry and Biochemistry, University
of California, Los Angeles, Los
Angeles, California 90095, United States
| | - Kendall N. Houk
- Department
of Chemistry and Biochemistry, University
of California, Los Angeles, Los
Angeles, California 90095, United States
| | - Hosea M. Nelson
- Division
of Chemistry and Chemical Engineering, California
Institute of Technology, Pasadena, California 91125, United States
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2
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Jiang ZT, Chen Z, Xia Y. Modular Synthesis of Fully-Substituted and Configuration-Defined Alkyl Vinyl Ethers Enabled by Dual-Functional Copper Catalysis. Angew Chem Int Ed Engl 2024; 63:e202319647. [PMID: 38198183 DOI: 10.1002/anie.202319647] [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: 12/19/2023] [Revised: 01/10/2024] [Accepted: 01/10/2024] [Indexed: 01/11/2024]
Abstract
Here we present a modular, chemo-, regio-, and stereoselective synthesis of fully-substituted and configuration-defined alkyl vinyl ethers (AVEs) using simple chemical feedstocks. The distinctive approach involves the chemo- and regioselective functionalization of the CF2 unit in gem-difluorinated cyclopropanes with O-H and C-H nucleophiles in a specific order. The resulting highly functionalized cyclopropanyl ethers then undergo a stereoselective ring-opening process to produce fully-substituted and configuration-defined AVEs. These AVEs are rarely accessible through conventional methods and are easily transformable. Mechanistic experiments indicate that the success of this method relies on the use of dual-functional copper catalysis, which is involved in both the functionalization of the CF2 unit and the subsequent ring-opening process.
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Affiliation(s)
- Zhong-Tao Jiang
- West China School of Public Health and West China Fourth Hospital, West China-PUMC C.C. Chen Institute of Health, and State Key Laboratory of Biotherapy, Sichuan University, 610041, Chengdu, China
| | - Zhengzhao Chen
- West China School of Public Health and West China Fourth Hospital, West China-PUMC C.C. Chen Institute of Health, and State Key Laboratory of Biotherapy, Sichuan University, 610041, Chengdu, China
| | - Ying Xia
- West China School of Public Health and West China Fourth Hospital, West China-PUMC C.C. Chen Institute of Health, and State Key Laboratory of Biotherapy, Sichuan University, 610041, Chengdu, China
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3
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Tromans J, Zhang B, Golding BT. Harnessing the Peterson Reaction for the Stereospecific Synthesis of Z-Vinyl Ethers. Chemistry 2024; 30:e202302708. [PMID: 37732540 DOI: 10.1002/chem.202302708] [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: 08/18/2023] [Revised: 09/18/2023] [Accepted: 09/21/2023] [Indexed: 09/22/2023]
Abstract
Vinyl ethers are valuable synthetic intermediates which are also found as natural products, including aflatoxins, rifamycins and plasmalogens. The latter are ubiquitous phospholipids in human cells and contain a vinyl ether moiety with specifically Z configuration. Although numerous methods are available for synthesis of vinyl ethers, there is a lack of methods for obtaining Z isomers of molecules of the type RCH=CHOR' that are applicable to plasmalogens. A variant of the Peterson reaction is described that generates such molecules with very high stereoselectivity (Z/E ratio: 99 : 1). (R,R)/(S,S)-1-alkoxy-2-hydroxyalkylsilanes were synthesized from 1-trimethylsilylalkynes by a sequence of reduction with di-isobutylaluminium hydride to a (Z)-1-trimethylsilylalkene, epoxidation of the alkene to a 2-trimethylsilyl-3-substituted epoxide and regioselective, boron-trifluoride catalyzed ring-opening of the epoxide by reaction with an alcohol. Conversion of the (R,R)/(S,S)-1-alkoxy-2-hydroxyalkylsilanes to vinyl ethers (RCH=CHOR') was achieved under basic conditions as in a standard Peterson reaction. However, near exclusive formation of a Z vinyl ether was only achieved when the reaction was performed using potassium hydride in the non-polar solvent α,α,α-trifluorotoluene, more polar solvents giving increasing amounts of the E isomer. The sequence described embraces a variety of substituents and precursors, proceeds in overall high yield and is readily scalable.
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Affiliation(s)
- Jay Tromans
- School of Natural and Environmental Sciences - Chemistry, Newcastle University, Bedson Building, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
| | - Bian Zhang
- BiBerChem Research Ltd., The Biosphere, Draymans Way, Newcastle Helix, Newcastle upon Tyne, NE4 5BX, UK
| | - Bernard T Golding
- School of Natural and Environmental Sciences - Chemistry, Newcastle University, Bedson Building, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
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4
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To TA, Nguyen TV. Olefination of Aromatic Carbonyls via Site-Specific Activation of Cycloalkanone Ketals. Angew Chem Int Ed Engl 2024; 63:e202317003. [PMID: 37997004 DOI: 10.1002/anie.202317003] [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: 11/09/2023] [Revised: 11/22/2023] [Accepted: 11/23/2023] [Indexed: 11/25/2023]
Abstract
Skeletal editing is an important strategy in organic synthesis as it modifies the carbon backbone to tailor molecular structures with precision, enabling access to compounds with specific desired properties. Skeletal editing empowers chemists to transform synthetic approaches of target compounds across diverse applications from drug discovery to materials science. Herein, we introduce a new skeletal editing method to convert readily available aromatic carbonyl compounds into valuable unsaturated carboxylic acids with extended carbon chains. Our reaction setup enables a cascade reaction of enolization-[2+2]cycloaddition-[2+2]cycloreversion between aromatic carbonyl compounds and ketals of cyclic ketones to generate unsaturated carboxylic acids as ring-opening products. Through a simple design, our substrates are specifically activated to react at predetermined positions to enhance selectivity and efficiency. This practical method offers convenient access to versatile organic building blocks as well as provides fresh insights into manipulating traditional reaction pathways for new synthetic applications.
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Affiliation(s)
- Tuong Anh To
- School of Chemistry, University of New South Wales, Sydney Anzac Parade, Kensington, NSW 2052, Australia
| | - Thanh Vinh Nguyen
- School of Chemistry, University of New South Wales, Sydney Anzac Parade, Kensington, NSW 2052, Australia
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5
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Sun J, Guo Y, Xia J, Zheng G, Zhang Q. Catalyst-Free Trans-Selective Oxyiodination and Oxychlorination of Alkynes Employing N-X (Halogen) Reagents. Molecules 2023; 28:7420. [PMID: 37959838 PMCID: PMC10650761 DOI: 10.3390/molecules28217420] [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: 09/21/2023] [Revised: 10/28/2023] [Accepted: 11/02/2023] [Indexed: 11/15/2023] Open
Abstract
β-halogenated enol esters and ethers are versatile building blocks in organic synthesis, which has attracted increasing attention. In this study, we report the facile trans-oxyiodination and oxychlorination of alkynes, leading to the direct construction of versatile halogenated enol esters and ethers. This transformation features an easy operation, optimal atomic economy, a strong functional group tolerance, broad substrate scope, and excellent trans-selectivity. Employing highly electrophilic bifunctional N-X (halogen) reagents was the key to achieving broad reaction generality. To our knowledge, this transformation represents the first oxyhalogenation system employing N-X (halogen) reagents as both oxylation and halogenation sources.
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Affiliation(s)
- Jiaqiong Sun
- School of Environment, Northeast Normal University, Changchun 130117, China;
| | - Yunliang Guo
- School of Environment, Northeast Normal University, Changchun 130117, China;
| | - Jiuli Xia
- Key Laboratory of Functional Organic Molecule Design & Synthesis of Jilin Province, Department of Chemistry, Northeast Normal University, Changchun 130024, China; (J.X.); (Q.Z.)
| | - Guangfan Zheng
- Key Laboratory of Functional Organic Molecule Design & Synthesis of Jilin Province, Department of Chemistry, Northeast Normal University, Changchun 130024, China; (J.X.); (Q.Z.)
| | - Qian Zhang
- Key Laboratory of Functional Organic Molecule Design & Synthesis of Jilin Province, Department of Chemistry, Northeast Normal University, Changchun 130024, China; (J.X.); (Q.Z.)
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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6
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Kobayashi K, Komatsuzaki S, Onozawa SY, Masuda K, Kobayashi S. Aluminium-catalysed synthesis of aryl enol ethers from phenols and dimethyl ketals. Org Biomol Chem 2023; 21:8259-8262. [PMID: 37695162 DOI: 10.1039/d3ob01266b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/12/2023]
Abstract
We report an environmentally friendly, aluminium-catalysed, halide- and transition metal-free method for the synthesis of aryl enol ethers from phenols and dimethyl ketals that involves ketal exchange driven by the removal of methanol. The obtained aryl enol ethers were transformed into the corresponding diaryl ethers by Pd/C-catalysed dehydrogenation or DDQ oxidation.
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Affiliation(s)
- Kwihwan Kobayashi
- Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology Central 5, Higashi 1-1-1, Tsukuba, Ibaraki 305-8565, Japan.
| | - Shingo Komatsuzaki
- Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology Central 5, Higashi 1-1-1, Tsukuba, Ibaraki 305-8565, Japan.
| | - Shun-Ya Onozawa
- Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology Central 5, Higashi 1-1-1, Tsukuba, Ibaraki 305-8565, Japan.
| | - Koichiro Masuda
- Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology Central 5, Higashi 1-1-1, Tsukuba, Ibaraki 305-8565, Japan.
| | - Shū Kobayashi
- Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology Central 5, Higashi 1-1-1, Tsukuba, Ibaraki 305-8565, Japan.
- Department of Chemistry, School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 111-0033, Japan
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7
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Pham SL, Kim T, McDonald FE. Stereospecific Cu(I)-Catalyzed C-O Cross-Coupling Synthesis of Acyclic 1,2-Di- and Trisubstituted Vinylic Ethers from Alcohols and Vinylic Halides. Org Lett 2023. [PMID: 37437300 PMCID: PMC10367064 DOI: 10.1021/acs.orglett.3c01849] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/14/2023]
Abstract
CuI and trans-N,N'-dimethylcyclohexyldiamine catalyze the single-step C-O bond cross-coupling between 1,2-di- and trisubstituted vinylic halides with functionalized alcohols, producing acyclic vinylic ethers. This stereospecific transformation selectively gives each of the (E)- and (Z)-vinylic ether products from the corresponding vinyl halide precursors. This method is compatible with carbohydrate-derived primary and secondary alcohols and several other functional groups. The conditions are mild enough to reliably generate vinylic allylic ethers without promoting Claisen rearrangements.
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Affiliation(s)
- San L Pham
- Department of Chemistry, Emory University, 1515 Dickey Drive NE, Atlanta, Georgia 30322, United States
| | - Taehee Kim
- Department of Chemistry, Emory University, 1515 Dickey Drive NE, Atlanta, Georgia 30322, United States
| | - Frank E McDonald
- Department of Chemistry, Emory University, 1515 Dickey Drive NE, Atlanta, Georgia 30322, United States
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8
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Polimera SR, Ilangovan A, Subbaiah MAM. Examining the Scope of Deriving β-Aryl Enones from Enol Silanes as Ketone Equivalents via Pd(II)-Mediated Sequential Dehydrosilylation and Arylation. J Org Chem 2023. [PMID: 37192466 DOI: 10.1021/acs.joc.3c00502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Silyl enol ethers were examined as a masked source of saturated ketones to derive β-aryl enones and their derivatives by dehydrosilylation to generate enones in situ and subsequent oxidative arylation with arylboronic acids as transmetallation coupling partners using relayed Pd(II) catalysis in one pot under base-free conditions. Oxygen was found to be an efficient and green oxidant to enable both dehydrosilylation of enol silanes and arylation. Additionally, arylation conditions can be custom-designed to take advantage of aryl halides as an alternative source of arylating agents. The preparative scope was investigated with 35 examples (up to 95% yield), and mechanistic studies implied a cationic Pd(II)-based catalytic system.
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Affiliation(s)
- Subba Rao Polimera
- Department of Medicinal Chemistry, Biocon Bristol Myers Squibb R&D Centre, Biocon Park, Bommasandra IV Phase, Jigani Link Road, Bangalore 560099, Karnataka, India
- Department of Chemistry, Bharathidasan University, Palkalaiperur, Thiruchirapalli 620024, Tamil Nadu, India
| | - Andivelu Ilangovan
- Department of Chemistry, Bharathidasan University, Palkalaiperur, Thiruchirapalli 620024, Tamil Nadu, India
| | - Murugaiah A M Subbaiah
- Department of Medicinal Chemistry, Biocon Bristol Myers Squibb R&D Centre, Biocon Park, Bommasandra IV Phase, Jigani Link Road, Bangalore 560099, Karnataka, India
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9
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Zhang TS, Song SQ, Qi MJ, Hao WJ, Jiang B. Photocatalytic annulative trifluoromethyletherification of 1,6-enynes for accessing 1-indanones. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.154290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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10
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Polimera SR, Ilangovan A, Meanwell NA, Subbaiah MAM. Synthetic Access to α-Oxoketene Aminals by the Nucleophilic Addition of Enol Silane-Derived Palladium(II) Enolates to Carbodiimides. J Org Chem 2022; 87:14778-14792. [PMID: 36285601 DOI: 10.1021/acs.joc.2c02107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Synthetically important α-oxoketene aminal intermediates can now be accessed from readily available and inexpensive carbodiimides as starting materials via the nucleophilic addition of palladium enolates derived from enol silane precursors. This operationally simple method features mild reaction conditions, including open air atmosphere, ligand-free metal catalysis, broad substrate scope, and multi-gram scalability. Select synthetic applications that take advantage of the enamine character of α-oxoketene aminals and involve C-nucleophilic additions to electrophilic systems, including an α,β-unsaturated ester, an azo dicarboxylate, an aralkyl halide, and an aldehyde, are demonstrated.
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Affiliation(s)
- Subba Rao Polimera
- Department of Medicinal Chemistry, Biocon Bristol Myers Squibb R&D Centre, Biocon Park, Bommasandra IV Phase, Jigani Link Road, Bangalore, Karnataka 560099, India.,Department of Chemistry, Bharathidasan University, Palkalaiperur, Thiruchirapalli, Tamil Nadu 620024, India
| | - Andivelu Ilangovan
- Department of Chemistry, Bharathidasan University, Palkalaiperur, Thiruchirapalli, Tamil Nadu 620024, India
| | - Nicholas A Meanwell
- Department of Small Molecule Drug Discovery, Bristol Myers Squibb Research and Early Development, P.O. Box 4000, Princeton, New Jersey 08543-4000, United States
| | - Murugaiah A M Subbaiah
- Department of Medicinal Chemistry, Biocon Bristol Myers Squibb R&D Centre, Biocon Park, Bommasandra IV Phase, Jigani Link Road, Bangalore, Karnataka 560099, India
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11
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Yang Z, Hou S, Cheng Y, Sun L, Yang CH. Co-Catalyzed Reductive Cyclization of Acrylate-Containing 1,6-Enynes. J Org Chem 2022; 87:13339-13345. [PMID: 36137272 DOI: 10.1021/acs.joc.2c01345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A Co-catalyzed reductive cyclization of acrylate-containing 1,6-enynes is reported, providing an approach to construct five-membered carbocyclic and heterocyclic scaffolds containing enol ethers and all-carbon quaternary carbons. This novel process enables an E/Z mixture of 1,6-enynes to react with good functional group tolerance and good isolated yields, in an operationally simple manner.
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Affiliation(s)
- Zhantao Yang
- Henan Key Laboratory of New Optoelectronic Functional Materials, College of Chemistry and Chemical Engineering, Anyang Normal University, 436 Xian'ge Road, Anyang 455000, PR China
| | - Shenyin Hou
- Henan Key Laboratory of New Optoelectronic Functional Materials, College of Chemistry and Chemical Engineering, Anyang Normal University, 436 Xian'ge Road, Anyang 455000, PR China
| | - Yunfan Cheng
- Henan Key Laboratory of New Optoelectronic Functional Materials, College of Chemistry and Chemical Engineering, Anyang Normal University, 436 Xian'ge Road, Anyang 455000, PR China
| | - Li Sun
- Henan Key Laboratory of New Optoelectronic Functional Materials, College of Chemistry and Chemical Engineering, Anyang Normal University, 436 Xian'ge Road, Anyang 455000, PR China
| | - Chun-Hua Yang
- Henan Key Laboratory of New Optoelectronic Functional Materials, College of Chemistry and Chemical Engineering, Anyang Normal University, 436 Xian'ge Road, Anyang 455000, PR China
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12
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Rao MLN, Islam SS. Rearrangement-Driven Molecular Diversity: Synthesis of Functionalized Pyrones, Orthoesters, and Xanthones from Spiroketals. Org Lett 2021; 23:8668-8672. [PMID: 34714091 DOI: 10.1021/acs.orglett.1c02888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reaction of tricyclic 5,5-benzannulated spiroketals with trifluoroacetic acid (TFA) and AlCl3 furnished benzopyranobenzopyrans, benzofuro-orthoesters, and benzofuroxanthones. Whereas the reaction of tricyclic 5,5-benzannulated spiroketals with TFA produced the pyrones, the reaction with AlCl3 furnished densely functionalized orthoesters and xanthones. The formation of these products was rationalized by fascinating mechanistic pathways involving semipinacol/α-ketol molecular rearrangements.
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Affiliation(s)
- Maddali L N Rao
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Sk Shamim Islam
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
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13
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Polimera SR, A M Subbaiah M, Ilangovan A. The Ligand Free Palladium(II)-Catalyzed Regioselective 1,2-Addition of Enol Silanes to Quinones to Access 4-Hydroxy-4-(2-oxo-2-arylethyl)cyclohexadien-1-ones and Synthetic Applications. J Org Chem 2021; 86:14356-14370. [PMID: 34554740 DOI: 10.1021/acs.joc.1c00857] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
In contrast to the conventional 1,4-addition process, regioselective 1,2-addition of silyl enol ethers to quinones can now be achieved via a palladium(II) enolate pathway that provides access to 4-hydroxy-4-(2-oxo-2-arylethyl)cyclohexa-2,5-dien-1-one derivatives. This quinone alkylation protocol proceeds under mild reaction conditions at ambient temperature under open air and does not require either an external ligand for the palladium or the use of a base. Additionally, the cyclohexadienone products have been exploited as synthetic precursors for the construction of fused heteroaryl systems.
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Affiliation(s)
- Subba Rao Polimera
- Department of Medicinal Chemistry, BBRC, Syngene, Biocon Park, Bommasandra IV Phase, Jigani Link Road, Bangalore 560009, India.,Department of Chemistry, Bharathidasan University, Palkalaiperur, Thiruchirapalli, Tamil Nadu 620024, India
| | - Murugaiah A M Subbaiah
- Department of Medicinal Chemistry, BBRC, Syngene, Biocon Park, Bommasandra IV Phase, Jigani Link Road, Bangalore 560009, India
| | - Andivelu Ilangovan
- Department of Chemistry, Bharathidasan University, Palkalaiperur, Thiruchirapalli, Tamil Nadu 620024, India
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14
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Viñas-Lóbez J, Levitre G, de Aguirre A, Besnard C, Poblador-Bahamonde AI, Lacour J. Enabling Cyclization Strategies through Carbonyl-Ylide-Mediated Synthesis of Malonate Enol Ethers. ACS ORGANIC & INORGANIC AU 2021; 1:11-17. [PMID: 36855638 PMCID: PMC9954264 DOI: 10.1021/acsorginorgau.1c00006] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Malonate enol ethers are afforded in one step by condensation of cyclic ketones with α-diazomalonates under [CpRu(CH3CN)3][BArF] catalysis. The dual reactivity of these 2-vinyloxymalonates can be used to expand the classical range of cyclizations derived from carbonyl ylide intermediates.
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Affiliation(s)
- Júlia Viñas-Lóbez
- Department
of Organic Chemistry and Laboratoire de Cristallographie, University of Geneva, Geneva CH-1211, Switzerland
| | - Guillaume Levitre
- Department
of Organic Chemistry and Laboratoire de Cristallographie, University of Geneva, Geneva CH-1211, Switzerland
| | - Adiran de Aguirre
- Department
of Organic Chemistry and Laboratoire de Cristallographie, University of Geneva, Geneva CH-1211, Switzerland
| | - Céline Besnard
- Department
of Organic Chemistry and Laboratoire de Cristallographie, University of Geneva, Geneva CH-1211, Switzerland
| | - Amalia I. Poblador-Bahamonde
- Department
of Organic Chemistry and Laboratoire de Cristallographie, University of Geneva, Geneva CH-1211, Switzerland
| | - Jérôme Lacour
- Department
of Organic Chemistry and Laboratoire de Cristallographie, University of Geneva, Geneva CH-1211, Switzerland
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15
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Ghrairi S, Essalah K, Crousse B, Barhoumi-Slimi T. β-chlorovinylaldehydes as intermediates in the synthesis of new substituted β–fluoroalkoxyvinyl aldehydes and corresponding alcohols. J Fluor Chem 2021. [DOI: 10.1016/j.jfluchem.2021.109837] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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16
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Ahmad SAZ, Jena TK, Khan FA. Alkyl Enol Ethers: Development in Intermolecular Organic Transformation. Chem Asian J 2021; 16:1685-1702. [PMID: 33979009 DOI: 10.1002/asia.202100277] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Revised: 04/27/2021] [Indexed: 01/03/2023]
Abstract
Alkyl enol ethers (AEE) are versatile synthetic intermediates with a unique reactivity pattern. This review article summarizes the synthesis of AEE as well as its reactivity and how enol ether undergoes intermolecular reactions for various bond formation, leading to the construction of several useful organic molecules. The synthetic applications of alkyl enol ethers towards intermolecular bond-forming reactions include metal-catalyzed reactions, cycloaddition and heterocycle formation as well as rwactions in the field of natural products synthesis. The achievement of these impressive transformations prove the countless synthetic potential of AEE. The main objective of this review is to bring attentiveness among synthetic chemists to show how AEE extensively can be used to react with both electrophiles as well as nucleophiles, thereby behaving as an ambiphilic reactant. We trust that the unique reactivity pattern of alkyl enol ethers and the fundamental mechanistic idea can attract chemists in AEE chemistry. Exclusively, intermolecular reactions of AEE with other functionalized moieties have not been reviewed to the best of our knowledge.
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Affiliation(s)
- Sarwat Asma Ziya Ahmad
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana, 502285, India
| | - Tapan Kumar Jena
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana, 502285, India
| | - Faiz Ahmed Khan
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana, 502285, India
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17
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Saget R, Jaunky P, Duñach E. Bi(OTf) 3-catalysed intramolecular cyclisation of unsaturated acetals. RSC Adv 2021; 11:21066-21072. [PMID: 35479394 PMCID: PMC9034051 DOI: 10.1039/d1ra03686f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Accepted: 06/07/2021] [Indexed: 01/06/2023] Open
Abstract
A series of highly functionalized carbocycles was efficiently prepared via the selective cyclisation of unsaturated acetals and ketals in the presence of only 1 mol% of Bi(iii) or Fe(iii) triflates as the catalysts at room temperature, with yields ranging from 60 to 90%. With Bi(OTf)3 catalysis, α,β-unsaturated ether carbocycles are formed selectively, whereas with the Fe(OTf)3 system, a cycloisomerisation to carbocyclic diethers is mainly obtained. This acetal/olefin cyclisation could be run at a multi-gram scale and compound 2c could be obtained on a 300 gram-scale with a yield of 69% after precipitation in hexane. A series of highly functionalized carbocycles was efficiently prepared via the selective cyclisation of unsaturated acetals and ketals in the presence of only 1 mol% of Bi(iii) or Fe(iii) triflates as the catalysts at room temperature, with yields ranging from 60 to 90%.![]()
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Affiliation(s)
- Raphaël Saget
- Institut de Chimie de Nice, Université Cote d'Azur, CNRS Parc Valrose 06108 Nice cedex 2 France http://web.univ-cotedazur.fr/labs/icn/fr.,V. MANE Fils, Centre de Recherche en Chimie Organique 620 Route de Grasse Le Bar-sur-Loup 06620 France https://www.mane.com/
| | - Piotr Jaunky
- V. MANE Fils, Centre de Recherche en Chimie Organique 620 Route de Grasse Le Bar-sur-Loup 06620 France https://www.mane.com/
| | - Elisabet Duñach
- Institut de Chimie de Nice, Université Cote d'Azur, CNRS Parc Valrose 06108 Nice cedex 2 France http://web.univ-cotedazur.fr/labs/icn/fr
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18
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Gaykar RN, George M, Guin A, Bhattacharjee S, Biju AT. An Umpolung Oxa-[2,3] Sigmatropic Rearrangement Employing Arynes for the Synthesis of Functionalized Enol Ethers. Org Lett 2021; 23:3447-3452. [PMID: 33830779 DOI: 10.1021/acs.orglett.1c00911] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An oxa-[2,3] sigmatropic rearrangement involving arynes is reported featuring the umpolung of ketones, where the C═O bond polarity is reversed. The in situ-generated sulfur ylides from β-keto thioethers and arynes undergo efficient rearrangement allowing the facile and robust synthesis of functionalized enol ethers in high yields and excellent functional group compatibility. Preliminary mechanistic studies rule out the possibility of Pummerer-type rearrangement operating in this case.
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Affiliation(s)
- Rahul N Gaykar
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Malini George
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Avishek Guin
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Subrata Bhattacharjee
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - Akkattu T Biju
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India
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19
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Anderson TE, Andia AA, Woerpel KA. Chemiluminescence-promoted oxidation of alkyl enol ethers by NHPI under mild conditions and in the dark. Tetrahedron 2021; 82:131874. [PMID: 33994596 PMCID: PMC8117068 DOI: 10.1016/j.tet.2020.131874] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
The hydroperoxidation of alkyl enol ethers using N-hydroxyphthalimide and molecular oxygen occurred in the absence of catalyst, initiator, or light. The reaction proceeds through a radical mechanism that is initiated by N-hydroxyphthalimide-promoted autoxidation of the enol ether substrate. The resulting dioxetane products decompose in a chemiluminescent reaction that allows for photochemical activation of N-hydroxyphthalimide in the absence of other light sources.
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Affiliation(s)
- T. E. Anderson
- Department of Chemistry, New York University, 100 Washington Square East, New York, NY, 10003, United States
| | - Alexander A. Andia
- Department of Chemistry, New York University, 100 Washington Square East, New York, NY, 10003, United States
| | - K. A. Woerpel
- Department of Chemistry, New York University, 100 Washington Square East, New York, NY, 10003, United States
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20
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Matsumoto T, Hagiyama H, Kuribayashi K, Hioki K, Fujita H, Ochiai M, Kunishima M. A versatile iodo(III)etherification of terminal ethynylsilanes using BF 3-O iPr 2 and alkyl benzyl ethers. Org Biomol Chem 2021; 19:3825-3828. [PMID: 33949597 DOI: 10.1039/d1ob00479d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
A series of (E)-α-silyl-β-alkoxyvinyl-λ3-iodanes was synthesized from iodosylbenzene, BF3-ether complexes, and terminal ethynylsilanes. The combined use of BF3-OiPr2 and benzyl ethers of primary alcohols (ROBn) allows the chemoselective transfer of primary alkoxy groups (RO) onto the β-position of the terminal ethynylsilanes.
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Affiliation(s)
- Takuya Matsumoto
- Faculty of Pharmaceutical Sciences, Institute of Medical, Pharmaceutical, and Health Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
| | - Hiroshi Hagiyama
- Faculty of Pharmaceutical Sciences, Kobe Gakuin University, 1-1-3 Minatojima, Chuo-ku, Kobe 650-8586, Japan
| | - Kanetsugu Kuribayashi
- Faculty of Pharmaceutical Sciences, Institute of Medical, Pharmaceutical, and Health Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
| | - Kazuhito Hioki
- Faculty of Pharmaceutical Sciences, Kobe Gakuin University, 1-1-3 Minatojima, Chuo-ku, Kobe 650-8586, Japan
| | - Hikaru Fujita
- Faculty of Pharmaceutical Sciences, Institute of Medical, Pharmaceutical, and Health Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
| | - Masahito Ochiai
- Graduate School of Pharmaceutical Sciences, Tokushima University, 1-78 Shomachi, Tokushima 770-8505, Japan
| | - Munetaka Kunishima
- Faculty of Pharmaceutical Sciences, Institute of Medical, Pharmaceutical, and Health Sciences, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
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21
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Ohno S, Arisawa M. Carbo- and Heterocycle Syntheses via Reactions between Two Multiple Bonds; Involving Heteroatom-Substituted Unsaturated Bonds. J SYN ORG CHEM JPN 2021. [DOI: 10.5059/yukigoseikyokaishi.79.22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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22
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Ura T, Shimbo D, Yudasaka M, Tada N, Itoh A. Synthesis of Phenol-Derived cis-Vinyl Ethers Using Ethynyl Benziodoxolone. Chem Asian J 2020; 15:4000-4004. [PMID: 33058543 DOI: 10.1002/asia.202001102] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 10/07/2020] [Indexed: 12/19/2022]
Abstract
The stereoselective synthesis of cis-β-phenoxyvinyl benziodoxolones (cis-β-phenol-VBXs) from an ethynyl benziodoxolone-acetonitrile complex (EBX-MeCN) and various phenols is reported herein. The reaction tolerates different phenol derivatives, including complex natural products, and can be conducted under mild conditions. The synthesis was performed in an aqueous solvent in the absence and presence of a catalytic amount of a base. Selectively mono- and di-deuterated cis-β-phenol-VBXs were also prepared. cis-β-Phenol-VBXs were stereospecifically derivatized to cis-alkynylvinyl ethers and cis-iodovinyl ethers without loss of stereoselectivity or reduction in the deuterium/hydrogen ratio.
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Affiliation(s)
- Tomoki Ura
- Laboratory of Pharmaceutical Synthetic Chemistry, Gifu Pharmaceutical University, 1-25-4, Daigaku-nishi, Gifu, 501-1196, Japan
| | - Daisuke Shimbo
- Laboratory of Pharmaceutical Synthetic Chemistry, Gifu Pharmaceutical University, 1-25-4, Daigaku-nishi, Gifu, 501-1196, Japan
| | - Masaharu Yudasaka
- Laboratory of Pharmaceutical Synthetic Chemistry, Gifu Pharmaceutical University, 1-25-4, Daigaku-nishi, Gifu, 501-1196, Japan
| | - Norihiro Tada
- Laboratory of Pharmaceutical Synthetic Chemistry, Gifu Pharmaceutical University, 1-25-4, Daigaku-nishi, Gifu, 501-1196, Japan
| | - Akichika Itoh
- Laboratory of Pharmaceutical Synthetic Chemistry, Gifu Pharmaceutical University, 1-25-4, Daigaku-nishi, Gifu, 501-1196, Japan
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23
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Uraguchi D, Ueoka F, Tanaka N, Kizu T, Takahashi W, Ooi T. A Structurally Robust Chiral Borate Ion: Molecular Design, Synthesis, and Asymmetric Catalysis. Angew Chem Int Ed Engl 2020; 59:11456-11461. [DOI: 10.1002/anie.202001637] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 03/12/2020] [Indexed: 02/02/2023]
Affiliation(s)
- Daisuke Uraguchi
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
| | - Fumito Ueoka
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
| | - Naoya Tanaka
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
| | - Tomohito Kizu
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
| | - Wakana Takahashi
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
| | - Takashi Ooi
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
- Institute of Transformative Bio-Molecules (WPI-ITbM) Nagoya University Nagoya 464-8601 Japan
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24
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Uraguchi D, Ueoka F, Tanaka N, Kizu T, Takahashi W, Ooi T. A Structurally Robust Chiral Borate Ion: Molecular Design, Synthesis, and Asymmetric Catalysis. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202001637] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Daisuke Uraguchi
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
| | - Fumito Ueoka
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
| | - Naoya Tanaka
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
| | - Tomohito Kizu
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
| | - Wakana Takahashi
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
| | - Takashi Ooi
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Nagoya 464-8603 Japan
- Institute of Transformative Bio-Molecules (WPI-ITbM) Nagoya University Nagoya 464-8601 Japan
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25
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Ding W, Chai J, Wang C, Wu J, Yoshikai N. Stereoselective Access to Highly Substituted Vinyl Ethers via trans-Difunctionalization of Alkynes with Alcohols and Iodine(III) Electrophile. J Am Chem Soc 2020; 142:8619-8624. [DOI: 10.1021/jacs.0c04140] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Wei Ding
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Jinkui Chai
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
- College of Chemistry, Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Chen Wang
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
- Zhejiang Key Laboratory of Alternative Technologies for Fine Chemical Process, Shaoxing University, Shaoxing 312000, P. R. China
| | - Junliang Wu
- College of Chemistry, Henan Institute of Advanced Technology, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Naohiko Yoshikai
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
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26
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Ohno S, Arisawa M. Cyclizations of Benzo-Fused Substrates Involving Two Multiple Bonds, Including Heteroatom-Substituted Unsaturated Bonds. J Org Chem 2020; 85:6831-6843. [DOI: 10.1021/acs.joc.0c00452] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Shohei Ohno
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Mitsuhiro Arisawa
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
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27
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Seijo L, Ondet P, Olivero S, Duñach E. Heterogeneous catalysis for the tandem cyclisation of unsaturated alcohols. NEW J CHEM 2020. [DOI: 10.1039/d0nj01857k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
A methodology for the tandem cycloisomerisation of doubly unsaturated alcohols using Amberlyst-15 was developed.
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Affiliation(s)
- Lorenzo Seijo
- Université Cote d’Azur
- Institut de Chimie de Nice
- CNRS Faculté des Sciences Parc Valrose
- 06108 Nice cedex 2
- France
| | - Pierrick Ondet
- Université Cote d’Azur
- Institut de Chimie de Nice
- CNRS Faculté des Sciences Parc Valrose
- 06108 Nice cedex 2
- France
| | - Sandra Olivero
- Université Cote d’Azur
- Institut de Chimie de Nice
- CNRS Faculté des Sciences Parc Valrose
- 06108 Nice cedex 2
- France
| | - Elisabet Duñach
- Université Cote d’Azur
- Institut de Chimie de Nice
- CNRS Faculté des Sciences Parc Valrose
- 06108 Nice cedex 2
- France
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