1
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Pattanaik S, Kumar A, Gunanathan C. Cobalt-catalysed [1,2]-Wittig rearrangement of ethers to secondary alcohols. Chem Commun (Camb) 2023; 59:1853-1856. [PMID: 36722974 DOI: 10.1039/d2cc06937g] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Stable ethers are successfully transformed into secondary alcohols via C-O bond activation using a simple cobalt pincer catalyst. Mechanistic studies indicate the involvement of radical pairs, and their sequential recombination and the subsequent hydrolysis results in the formation of secondary alcohols.
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Affiliation(s)
- Sandip Pattanaik
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute, Bhubaneswar-752050, India.
| | - Anurag Kumar
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute, Bhubaneswar-752050, India.
| | - Chidambaram Gunanathan
- School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute, Bhubaneswar-752050, India.
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2
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Rani S, Dash SR, Bera A, Alam MN, Vanka K, Maity P. Phosphite mediated asymmetric N to C migration for the synthesis of chiral heterocycles from primary amines. Chem Sci 2021; 12:8996-9003. [PMID: 34276927 PMCID: PMC8261767 DOI: 10.1039/d1sc01217g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Accepted: 05/27/2021] [Indexed: 11/21/2022] Open
Abstract
A phosphite mediated stereoretentive C-H alkylation of N-alkylpyridinium salts derived from chiral primary amines was achieved. The reaction proceeds through the activation of the N-alkylpyridinium salt substrate with a nucleophilic phosphite catalyst, followed by a base mediated [1,2] aza-Wittig rearrangement and subsequent catalyst dissociation for an overall N to C-2 alkyl migration. The scope and degree of stereoretention were studied, and both experimental and theoretical investigations were performed to support an unprecedented aza-Wittig rearrangement-rearomatization sequence. A catalytic enantioselective version starting with racemic starting material and chiral phosphite catalyst was also established following our understanding of the stereoretentive process. This method provides efficient access to tertiary and quaternary stereogenic centers in pyridine systems, which are prevalent in drugs, bioactive natural products, chiral ligands, and catalysts.
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Affiliation(s)
- Soniya Rani
- Organic Chemistry Division, CSIR-National Chemical Laboratory Pune-411008 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad-201002 India
| | - Soumya Ranjan Dash
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad-201002 India
- Physical and Material Chemistry Division, CSIR-National Chemical Laboratory Pune 411008 India
| | - Asish Bera
- Organic Chemistry Division, CSIR-National Chemical Laboratory Pune-411008 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad-201002 India
| | - Md Nirshad Alam
- Organic Chemistry Division, CSIR-National Chemical Laboratory Pune-411008 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad-201002 India
| | - Kumar Vanka
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad-201002 India
- Physical and Material Chemistry Division, CSIR-National Chemical Laboratory Pune 411008 India
| | - Pradip Maity
- Organic Chemistry Division, CSIR-National Chemical Laboratory Pune-411008 India
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3
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Alam MN, Dash SR, Mukherjee A, Pandole S, Marelli UK, Vanka K, Maity P. [1,3]-Claisen Rearrangement via Removable Functional Group Mediated Radical Stabilization. Org Lett 2021; 23:890-895. [PMID: 33443431 DOI: 10.1021/acs.orglett.0c04109] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A thermal O-to-C [1,3]-rearrangement of α-hydroxy acid derived enol ethers was achieved under mild conditions. The 2-aminothiophenol protection of carboxylic acids facilitates formation of the [1,3] precursor and its thermal rearrangement via stabilization of a radical intermediate. Experimental and theoretical evidence for dissociative radical pair formation, its captodative stability via aminothiophenol, and a unique solvent effect are presented. The aminothiophenol was deprotected from rearrangement products as well as after derivatization to useful synthons.
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Affiliation(s)
- Md Nirshad Alam
- Organic Chemistry Division, CSIR-National Chemical Laboratory, Pune 411008, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Soumya Ranjan Dash
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India.,Physical and Material Chemistry Division, CSIR-National Chemical Laboratory, Pune 411008, India
| | - Anirban Mukherjee
- Organic Chemistry Division, CSIR-National Chemical Laboratory, Pune 411008, India
| | - Satish Pandole
- Organic Chemistry Division, CSIR-National Chemical Laboratory, Pune 411008, India
| | - Udaya Kiran Marelli
- Organic Chemistry Division, CSIR-National Chemical Laboratory, Pune 411008, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Kumar Vanka
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India.,Physical and Material Chemistry Division, CSIR-National Chemical Laboratory, Pune 411008, India
| | - Pradip Maity
- Organic Chemistry Division, CSIR-National Chemical Laboratory, Pune 411008, India
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4
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Klychnikov MK, Pohl R, Císařová I, Jahn U. Application of the Brook Rearrangement in Tandem with Single Electron Transfer Oxidative and Radical Processes. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000126] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Mikhail K. Klychnikov
- Institute of Organic Chemistry and Biochemistry; Czech Academy of Sciences; Flemingovo náměstí 2 16610 Prague 6 Czech Republic
| | - Radek Pohl
- Institute of Organic Chemistry and Biochemistry; Czech Academy of Sciences; Flemingovo náměstí 2 16610 Prague 6 Czech Republic
| | - Ivana Císařová
- Department of Inorganic Chemistry; Faculty of Science; Charles University in Prague; Hlavova 2030/8 12843 Prague 2 Czech Republic
| | - Ullrich Jahn
- Institute of Organic Chemistry and Biochemistry; Czech Academy of Sciences; Flemingovo náměstí 2 16610 Prague 6 Czech Republic
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5
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Alam MN, K M L, Maity P. A removable functional group strategy for regiodivergent Wittig rearrangement products. Org Biomol Chem 2019; 16:8922-8926. [PMID: 30431052 DOI: 10.1039/c8ob02221f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
[1,2] and [2,3] Wittig rearrangements are competing reaction pathways, often leading to uncontrollable product distribution. We employ a single removable functional group to fulfill the dual role of attaining a reversible [2,3] and stabilizing radical intermediate for the [1,2] path to obtain both the Wittig products selectively for a broad range of substrates.
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Affiliation(s)
- Md Nirshad Alam
- Organic Chemistry Division, CSIR-National Chemical Laboratory, Pune-411008, India.
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6
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Urriolabeitia EP, Ruiz S. Ru(ii)-Catalysed synthesis of (1H)-isothiochromenes by oxidative coupling of benzylthioethers with internal alkynes. Org Biomol Chem 2019; 17:2542-2547. [DOI: 10.1039/c8ob03201g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
(1H)-Isothiochromenes have been prepared by Ru-catalysed oxidative coupling of benzylthioethers with internal alkynes.
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Affiliation(s)
- Esteban P. Urriolabeitia
- Instituto de Síntesis Química y Catálisis Homogénea
- ISQCH
- CSIC-Universidad de Zaragoza
- 50009 Zaragoza
- Spain
| | - Sara Ruiz
- Instituto de Síntesis Química y Catálisis Homogénea
- ISQCH
- CSIC-Universidad de Zaragoza
- 50009 Zaragoza
- Spain
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7
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Nath SR, Joshi KA. Mechanistic investigation in the [1,4] and [1,2] Wittig rearrangement reactions: a DFT study. Phys Chem Chem Phys 2018; 20:21457-21473. [PMID: 30087956 DOI: 10.1039/c8cp01045e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The mechanistic pathways for the [1,4] and [1,2] Wittig rearrangements of 2-silyl-6-aryl-5,6-dihydro-(2H)-pyrans have been studied at the M06-2X/6-31+G(d,p), 6-311++G(d,p) and cc-pVTZ level of theory. The crucial C-O bond cleavage step in the mechanism has been analysed initially, using two model reactions covering aliphatic as well as cyclic allylic ethers. The barriers for the one-step as well as two-step pathways have been calculated and the mechanisms for both the [1,4] and [1,2] Wittig rearrangement reactions are predicted to occur through a two-step mode. An energetic analysis of the reaction pathways reveals that the [1,4]-rearrangement has a lower barrier than the [1,2]-Wittig rearrangement. The C-O cleavage transition state was found to have the highest barrier and is thus the rate determining transition state for all of the studied molecules. This is in agreement with the previously published experimental studies. The role of the allylic trimethylsilane group in the stabilization of the intermediate anions of the Wittig reactants has also been investigated while comparing it with the phenyl and allylic t-butyl groups through Natural Bond Orbital (NBO) calculations.
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Affiliation(s)
- Shilpa R Nath
- Department of Chemistry, Institute of Chemical Technology, Matunga, Mumbai 400019, India.
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8
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Ho GM, Li YJ. Tandem [1,2]-Wittig Rearrangement/Lactonization of γ-Benzyloxy Vinylogous Urethanes: Application to the Synthetic Studies of Maculalactone A, Planchol C and γ-Lycorane. ASIAN J ORG CHEM 2017. [DOI: 10.1002/ajoc.201700589] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Guo-Ming Ho
- Department of Applied Chemistry; National Chiayi University; 300 Syuefu Road Chiayi City 60004 Taiwan
- Genomics Research Center; Academia Sinica; 128 Academia Road, Section 2 Taipei 11529 Taiwan
| | - Yu-Jang Li
- Department of Applied Chemistry; National Chiayi University; 300 Syuefu Road Chiayi City 60004 Taiwan
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9
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Velasco R, Silva López C, Nieto Faza O, Sanz R. Exploring the Reactivity of α-Lithiated Aryl Benzyl Ethers: Inhibition of the [1,2]-Wittig Rearrangement and the Mechanistic Proposal Revisited. Chemistry 2016; 22:15058-15068. [DOI: 10.1002/chem.201602254] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 07/11/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Rocío Velasco
- Área de Química Orgánica, Departamento de Química; Facultad de Ciencias; Universidad de Burgos; Pza. Misael Bañuelos s/n 09001 Burgos Spain
| | - Carlos Silva López
- Departamento de Química Orgánica; Universidade de Vigo; Campus As Lagoas 32004- Ourense Galicia Spain
| | - Olalla Nieto Faza
- Departamento de Química Orgánica; Universidade de Vigo; Campus As Lagoas 32004- Ourense Galicia Spain
| | - Roberto Sanz
- Área de Química Orgánica, Departamento de Química; Facultad de Ciencias; Universidad de Burgos; Pza. Misael Bañuelos s/n 09001 Burgos Spain
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10
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Gilmore K, Mohamed RK, Alabugin IV. The Baldwin rules: revised and extended. WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE 2016. [DOI: 10.1002/wcms.1261] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Kerry Gilmore
- Department of Biomolecular Systems; Max Planck Institute of Colloids and Interfaces; Potsdam Germany
| | - Rana K. Mohamed
- Department of Chemistry and Biochemistry; Florida State University; Tallahassee FL USA
| | - Igor V. Alabugin
- Department of Chemistry and Biochemistry; Florida State University; Tallahassee FL USA
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11
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Gao F, Kim BS, Walsh PJ. Chemoselective Palladium-Catalyzed Deprotonative Arylation/[1,2]-Wittig Rearrangement of Pyridylmethyl Ethers. Chem Sci 2016; 7:976-983. [PMID: 27014434 PMCID: PMC4800319 DOI: 10.1039/c5sc02739j] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Accepted: 10/26/2015] [Indexed: 12/16/2022] Open
Abstract
Control of chemoselectivity is one of the most challenging problems facing chemists and is particularly important in the synthesis of bioactive compounds and medications. Herein, the first highly chemoselective tandem C(sp3)-H arylation/[1,2]-Wittig rearrangement of pyridylmethyl ethers is presented. The efficient and operationally simple protocols enable generation of either arylation products or tandem arylation/[1,2]-Wittig rearrangement products with remarkable selectivity and good to excellent yields (60-99%). Choice of base, solvent, and reaction temperature play a pivotal role in tuning the reactivity of intermediates and controlling the relative rates of competing processes. The novel arylation step is catalyzed by a Pd(OAc)2/NIXANTPHOS-based system via a deprotonative cross-coupling process. The method provides rapid access to skeletally diverse aryl(pyridyl)methanol core structures, which are central components of several medications.
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Affiliation(s)
- Feng Gao
- Department of Medicinal Plants , Agronomy College , Sichuan Agricultural University , 211, Huimin Rd, Wenjiang Region , Chengdu 611130 , PR China
- Roy and Diana Vagelos Laboratories , Penn/Merck Laboratory for High-Throughput Experimentation , Department of Chemistry , University of Pennsylvania , 231 S, 34th St. , Philadelphia , PA 19104-6323 , USA . ; https://sites.google.com/site/titaniumupenn/ ; Fax: +1-215-573-6743
| | - Byeong-Seon Kim
- Roy and Diana Vagelos Laboratories , Penn/Merck Laboratory for High-Throughput Experimentation , Department of Chemistry , University of Pennsylvania , 231 S, 34th St. , Philadelphia , PA 19104-6323 , USA . ; https://sites.google.com/site/titaniumupenn/ ; Fax: +1-215-573-6743
| | - Patrick J. Walsh
- Roy and Diana Vagelos Laboratories , Penn/Merck Laboratory for High-Throughput Experimentation , Department of Chemistry , University of Pennsylvania , 231 S, 34th St. , Philadelphia , PA 19104-6323 , USA . ; https://sites.google.com/site/titaniumupenn/ ; Fax: +1-215-573-6743
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12
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Xu Z, Xu LW. Development of Ar-BINMOL-Derived Atropisomeric Ligands with Matched Axial and sp3Central Chirality for Catalytic Asymmetric Transformations. CHEM REC 2015; 15:925-48. [PMID: 26400411 DOI: 10.1002/tcr.201500208] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2015] [Indexed: 01/05/2023]
Affiliation(s)
- Zheng Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of the Ministry of Education; Hangzhou Normal University; No. 1378, Wenyi West Road Hangzhou P. R. China
| | - Li-Wen Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of the Ministry of Education; Hangzhou Normal University; No. 1378, Wenyi West Road Hangzhou P. R. China
- State Key Laboratory for Oxo Synthesis and Selective Oxidation; Lanzhou Institute of Chemical Physics; Chinese Academy of Sciences (CAS); No. 18, Tianshui Road Lanzhou P. R. China
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13
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Velasco R, Feberero C, Sanz R. α-Lithiated Aryl Benzyl Ethers: Inhibition of [1,2]-Wittig Rearrangement and Application to the Synthesis of Benzo[b]furan Derivatives. Org Lett 2015; 17:4416-9. [DOI: 10.1021/acs.orglett.5b01964] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rocío Velasco
- Área
de Química Orgánica, Departamento de Química,
Facultad de Ciencias, Universidad de Burgos, Pza. Misael Bañuelos s/n, 09001 Burgos, Spain
| | - Claudia Feberero
- Área
de Química Orgánica, Departamento de Química,
Facultad de Ciencias, Universidad de Burgos, Pza. Misael Bañuelos s/n, 09001 Burgos, Spain
| | - Roberto Sanz
- Área
de Química Orgánica, Departamento de Química,
Facultad de Ciencias, Universidad de Burgos, Pza. Misael Bañuelos s/n, 09001 Burgos, Spain
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14
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Everett RK, Wolfe JP. Aza-Wittig Rearrangements of N-Benzyl and N-Allyl Glycine Methyl Esters. Discovery of a Surprising Cascade Aza-Wittig Rearrangement/Hydroboration Reaction. J Org Chem 2015; 80:9041-56. [PMID: 26327486 DOI: 10.1021/acs.joc.5b01286] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Treatment of N-(arylmethyl)-N-aryl or N-allyl-N-aryl glycine methyl ester derivatives with (n)Bu2BOTf and (i)Pr2NEt effects an aza-Wittig rearrangement that provides N-aryl phenylalanine methyl ester derivatives and N-aryl allylglycine methyl ester derivatives, respectively, in good yield with moderate to good diastereoselectivity. Under similar conditions, analogous substrates bearing N-carbonyl groups are converted to 1,4,2-oxazaborole derivatives. Additionally, N-allyl-N-aryl glycine methyl ester derivatives subjected to similar conditions at elevated temperatures undergo an aza-[2,3]-Wittig rearrangement, followed by a subsequent hydroboration oxidation reaction, to afford substituted amino alcohol products.
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Affiliation(s)
- Renata K Everett
- Department of Chemistry, University of Michigan , 930 N. University Avenue, Ann Arbor, Michigan 48109-1055, United States
| | - John P Wolfe
- Department of Chemistry, University of Michigan , 930 N. University Avenue, Ann Arbor, Michigan 48109-1055, United States
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15
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Aza-[1,2]-Wittig rearrangements of N-benzyl glycine methyl esters. A new approach to the synthesis of N-aryl phenylalanine derivatives. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.01.037] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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16
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Kurosawa F, Nakano T, Soeta T, Endo K, Ukaji Y. (Z)-Selective Enol Triflation of α-Alkoxyacetoaldehydes: Application to Synthesis of (Z)-Allylic Alcohols via Cross-Coupling Reaction and [1,2]-Wittig Rearrangement. J Org Chem 2015; 80:5696-703. [PMID: 25970239 DOI: 10.1021/acs.joc.5b00647] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The stereoselective transformation of α-alkoxyacetoaldehydes to the corresponding (Z)-vinyl triflates was achieved by treatment with phenyl triflimide and DBU. The stereochemistry was explained by the "syn-effect," which was attributed primarily to an σ → π* interaction. The β-alkoxy vinyl triflates obtained were applied to the stereoselective synthesis of structurally diverse (Z)-allylic alcohols via transition metal-catalyzed cross-coupling reaction and [1,2]-Wittig rearrangement.
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Affiliation(s)
- Fumiya Kurosawa
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
| | - Takeo Nakano
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
| | - Takahiro Soeta
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
| | - Kohei Endo
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
| | - Yutaka Ukaji
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
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17
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Mori-Quiroz LM, Maleczka RE. Stereoconvergent [1,2]- and [1,4]-Wittig rearrangements of 2-silyl-6-aryl-5,6-dihydropyrans: a tale of steric vs electronic regiocontrol of divergent pathways. J Org Chem 2015; 80:1163-91. [PMID: 25490725 PMCID: PMC4301091 DOI: 10.1021/jo5026942] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Indexed: 11/29/2022]
Abstract
The regiodivergent ring contraction of diastereomeric 2-silyl-5,6-dihydro-6-aryl-(2H)-pyrans via [1,2]- and [1,4]-Wittig rearrangements to the corresponding α-silylcyclopentenols or (α-cyclopropyl)acylsilanes favor the [1,4]-pathway by ortho and para directing groups in the aromatic appendage and/or by sterically demanding silyl groups. The [1,2]-pathway is dominant with meta directing or electron-poor aromatic moieties. Exclusive [1,2]-Wittig rearrangements are observed when olefin substituents proximal to the silyl are present. cis and trans diastereomers exhibit different reactivities, but converge to a single [1,2]- or [1,4]-Wittig product with high diastereoselectivity and yield.
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Affiliation(s)
- Luis M. Mori-Quiroz
- Department of Chemistry, Michigan
State University, 578
South Shaw Lane, East
Lansing, Michigan 48824, United States
| | - Robert E. Maleczka
- Department of Chemistry, Michigan
State University, 578
South Shaw Lane, East
Lansing, Michigan 48824, United States
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18
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Gao PS, Ye F, Dong XY, Chen Y, Gao ZW, Zhang WQ, Xu LW. Base-promoted [1,4]-Wittig rearrangement of chalcone-derived allylic ethers leading to aromatic β-benzyl ketones. RSC Adv 2015. [DOI: 10.1039/c5ra03846d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Strong base promoted [1,4]-Wittig rearrangement of allylic ethers was developed in this work, in which the reaction provided a facile approach to the synthesis of aromatic β-benzyl ketones under controllable radical reaction conditions.
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Affiliation(s)
- Pei-Sen Gao
- Key Laboratory of Applied Surface and Colloid Chemistry
- Ministry of Education (MOE)
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi'an 710062
| | - Fei Ye
- Key Laboratory of Organosilicon Chemistry
- Material Technology of Ministry of Education
- Hangzhou Normal University
- Hangzhou 310012
- P. R. China
| | - Xiao-Yun Dong
- Key Laboratory of Applied Surface and Colloid Chemistry
- Ministry of Education (MOE)
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi'an 710062
| | - Yun Chen
- Key Laboratory of Applied Surface and Colloid Chemistry
- Ministry of Education (MOE)
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi'an 710062
| | - Zi-Wei Gao
- Key Laboratory of Applied Surface and Colloid Chemistry
- Ministry of Education (MOE)
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi'an 710062
| | - Wei-Qiang Zhang
- Key Laboratory of Applied Surface and Colloid Chemistry
- Ministry of Education (MOE)
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi'an 710062
| | - Li-Wen Xu
- Key Laboratory of Applied Surface and Colloid Chemistry
- Ministry of Education (MOE)
- School of Chemistry and Chemical Engineering
- Shaanxi Normal University
- Xi'an 710062
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19
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Wang CY, Dong C, Zheng ZJ, Xu Z, Yang KF, Xu LW. Construction of an all-substituted pyrrolidine derivative with multiple stereogenic centers and Betti-base-derived γ-amino alcohols by [1,2]-Wittig rearrangement. RSC Adv 2015. [DOI: 10.1039/c5ra09145d] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The construction of Betti base-derived γ-amino alcohols and all-substituted pyrrolidine derivative with multiple stereogenic centers has been developed successfully through neighboring lithium-assisted [1,2]-Wittig rearrangement (NLAWR).
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Affiliation(s)
- Cai-Yun Wang
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education (MOE)
- Hangzhou Normal University
- Hangzhou 311121
- P. R. China
| | - Cheng Dong
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education (MOE)
- Hangzhou Normal University
- Hangzhou 311121
- P. R. China
| | - Zhan-Jiang Zheng
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education (MOE)
- Hangzhou Normal University
- Hangzhou 311121
- P. R. China
| | - Zheng Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education (MOE)
- Hangzhou Normal University
- Hangzhou 311121
- P. R. China
| | - Ke-Fang Yang
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education (MOE)
- Hangzhou Normal University
- Hangzhou 311121
- P. R. China
| | - Li-Wen Xu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education (MOE)
- Hangzhou Normal University
- Hangzhou 311121
- P. R. China
- State Key Laboratory for Oxo Synthesis and Selective Oxidation
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20
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Lin X, Ye X, Sun X, Zhang Y, Gao L, Song Z. [1,5]-Anion relay via intramolecular proton transfer to generate 3,3-bis(silyl) allyloxy lithium: a useful scaffold for syn-addition to aldehydes and ketones. Org Lett 2014; 16:1084-7. [PMID: 24499418 DOI: 10.1021/ol4036402] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A [1,5]-anion relay has been achieved in 3,3-bis(silyl) benzyl enol ether. Deprotonation at the sterically more accessible benzyl position triggers an intramolecular proton transfer to generate the thermodynamically more stable 3,3-bis(silyl) allyloxy lithium. This endo-oriented allyl anion is stable at -78 °C and undergoes diastereoselective syn-addition at the γ-position with aldehydes and ketones to give monobenzyl-substituted 1,2-diols.
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Affiliation(s)
- Xinglong Lin
- Key Laboratory of Drug-Targeting of Education Ministry and Department of Medicinal Chemistry, West China School of Pharmacy, ‡State Key Laboratory of Biotherapy, West China Hospital, Sichuan University , Chengdu 610041, P. R. China
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21
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Řehová L, Císařová I, Jahn U. Divergent Reactivity of Alkyl Aryl Sulfones with Bases: Selective Functionalization ofortho-Aryl and α-Alkyl Units Enabled by a Unique Carbanion Transmetalation. European J Org Chem 2013. [DOI: 10.1002/ejoc.201301553] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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22
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Nakano T, Soeta T, Endo K, Inomata K, Ukaji Y. Stereoselective synthesis of (2Z,4E)-2,4-pentadien-1-ols via sequential 1,4-elimination reaction and [1,2]-Wittig rearrangement starting from (E)-4-alkoxy-2-butenyl benzoates. J Org Chem 2013; 78:12654-61. [PMID: 24245648 DOI: 10.1021/jo402272r] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The sequential 1,4-elimination reaction of (E)-4-alkoxy-2-butenyl benzoates and [1,2]-Wittig rearrangement gave (2Z,4E)-2,4-pentadien-1-ols stereoselectively. Z-Selective formation of intermediary vinyl ethers, whose stereochemistry was well elucidated by the "syn-effect", was achieved by treatment of the 2-butenyl benzoates with KOH in the presence of Pd catalyst. The subsequent [1,2]-Wittg rearrangement by use of n-BuLi proceeded with retention of the stereochemistry of the intermediary vinyl ethers.
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Affiliation(s)
- Takeo Nakano
- Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University , Kakuma, Kanazawa 920-1192, Japan
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23
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Onyeozili EN, Mori-Quiroz LM, Maleczka RE. [1,2]- and [1,4]-Wittig Rearrangements of α-Alkoxysilanes: Effect of Substitutions at both the Migrating Benzylic Carbon and the Terminal sp 2 Carbon of the Allyl Moiety. Tetrahedron 2013; 69:849-860. [PMID: 23459008 PMCID: PMC3580876 DOI: 10.1016/j.tet.2012.10.091] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Substituted α-alkoxysilanes can be deprotonated by alkyllithium bases and made to undergo Wittig rearrangements to afford the #x0005B;1,4]- and [1,2]-rearranged products in varying ratios. Substitution at the benzylic migrating carbon and/or at the allylic carbon of the allyl moiety impacts the rearrangement reaction, influencing the reactivity as well as the [1,4]-/[1,2]-selectivity. Diastereomeric α-alkoxysilanes show different reactivities with the syn diastereomer being the more reactive isomer.
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Affiliation(s)
- Edith N. Onyeozili
- Department of Chemistry, Florida A&M University, Tallahassee, FL 32307 USA
| | - Luis M. Mori-Quiroz
- Department of Chemistry, Michigan State University, 578 S. Shaw Lane, East Lansing, MI 48824 USA
| | - Robert E. Maleczka
- Department of Chemistry, Michigan State University, 578 S. Shaw Lane, East Lansing, MI 48824 USA
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24
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Affiliation(s)
| | - Kei Takeda
- Institute of Biomedical & Health Sciences, Hiroshima University
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25
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Denichoux A, Debien L, Cyklinsky M, Kaci M, Chemla F, Ferreira F, Pérez-Luna A. Three-Carbon Homologation of Diorganozincs with Lithiated Acetylenic Epoxides. J Org Chem 2012; 78:134-45. [DOI: 10.1021/jo302128n] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Aurélien Denichoux
- Institut Parisien de Chimie Moléculaire,
Institut
de Chimie Moléculaire (FR 2769), UPMC-Univ Paris 6, UMR CNRS 7201, Case 183, 4 place Jussieu, F-75252
Paris Cedex 05, France
| | - Laurent Debien
- Institut Parisien de Chimie Moléculaire,
Institut
de Chimie Moléculaire (FR 2769), UPMC-Univ Paris 6, UMR CNRS 7201, Case 183, 4 place Jussieu, F-75252
Paris Cedex 05, France
| | - Mathieu Cyklinsky
- Institut Parisien de Chimie Moléculaire,
Institut
de Chimie Moléculaire (FR 2769), UPMC-Univ Paris 6, UMR CNRS 7201, Case 183, 4 place Jussieu, F-75252
Paris Cedex 05, France
| | - Malika Kaci
- Institut Parisien de Chimie Moléculaire,
Institut
de Chimie Moléculaire (FR 2769), UPMC-Univ Paris 6, UMR CNRS 7201, Case 183, 4 place Jussieu, F-75252
Paris Cedex 05, France
| | - Fabrice Chemla
- Institut Parisien de Chimie Moléculaire,
Institut
de Chimie Moléculaire (FR 2769), UPMC-Univ Paris 6, UMR CNRS 7201, Case 183, 4 place Jussieu, F-75252
Paris Cedex 05, France
| | - Franck Ferreira
- Institut Parisien de Chimie Moléculaire,
Institut
de Chimie Moléculaire (FR 2769), UPMC-Univ Paris 6, UMR CNRS 7201, Case 183, 4 place Jussieu, F-75252
Paris Cedex 05, France
| | - Alejandro Pérez-Luna
- Institut Parisien de Chimie Moléculaire,
Institut
de Chimie Moléculaire (FR 2769), UPMC-Univ Paris 6, UMR CNRS 7201, Case 183, 4 place Jussieu, F-75252
Paris Cedex 05, France
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26
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Montaña ÁM, Ponzano S, Batalla C, Font-Bardia M. Unprecedented double benzylic rearrangement: regio- and stereospecific tandem 1,4-shift and Curtin rearrangement. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.07.053] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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27
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Bejjani J, Botuha C, Chemla F, Ferreira F, Magnus S, Pérez-Luna A. Metallotropic Equilibrium and Configurational Stability of 3-Chloro-1-(trimethylsilyl)propargyl and -allenyl Metals: Comparative Study among Lithium, Titanium, and Zinc. Organometallics 2012. [DOI: 10.1021/om300420q] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Joseph Bejjani
- UPMC-Univ Paris 06, UMR
CNRS 7201, Institut Parisien de Chimie Moléculaire, Institut
de Chimie Moléculaire (FR 2769), Case 183, 4 place Jussieu,
F-75252 Paris Cedex 05, France
| | - Candice Botuha
- UPMC-Univ Paris 06, UMR
CNRS 7201, Institut Parisien de Chimie Moléculaire, Institut
de Chimie Moléculaire (FR 2769), Case 183, 4 place Jussieu,
F-75252 Paris Cedex 05, France
| | - Fabrice Chemla
- UPMC-Univ Paris 06, UMR
CNRS 7201, Institut Parisien de Chimie Moléculaire, Institut
de Chimie Moléculaire (FR 2769), Case 183, 4 place Jussieu,
F-75252 Paris Cedex 05, France
| | - Franck Ferreira
- UPMC-Univ Paris 06, UMR
CNRS 7201, Institut Parisien de Chimie Moléculaire, Institut
de Chimie Moléculaire (FR 2769), Case 183, 4 place Jussieu,
F-75252 Paris Cedex 05, France
| | - Sarah Magnus
- UPMC-Univ Paris 06, UMR
CNRS 7201, Institut Parisien de Chimie Moléculaire, Institut
de Chimie Moléculaire (FR 2769), Case 183, 4 place Jussieu,
F-75252 Paris Cedex 05, France
| | - Alejandro Pérez-Luna
- UPMC-Univ Paris 06, UMR
CNRS 7201, Institut Parisien de Chimie Moléculaire, Institut
de Chimie Moléculaire (FR 2769), Case 183, 4 place Jussieu,
F-75252 Paris Cedex 05, France
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28
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29
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Brekan JA, Chernyak D, White KL, Scheidt KA. Lewis base-promoted carbon–carbon sp3–sp3 coupling reactions of α-silyl silylethers. Chem Sci 2012. [DOI: 10.1039/c2sc00581f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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30
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Gilmore K, Alabugin IV. Cyclizations of Alkynes: Revisiting Baldwin’s Rules for Ring Closure. Chem Rev 2011; 111:6513-56. [DOI: 10.1021/cr200164y] [Citation(s) in RCA: 387] [Impact Index Per Article: 29.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Kerry Gilmore
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida, 32306-4390
| | - Igor V. Alabugin
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida, 32306-4390
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31
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Baroudi A, Alicea J, Flack P, Kirincich J, Alabugin IV. Radical O→C Transposition: A Metal-Free Process for Conversion of Phenols into Benzoates and Benzamides. J Org Chem 2011; 76:1521-37. [DOI: 10.1021/jo102467j] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Abdulkader Baroudi
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Jeremiah Alicea
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Phillip Flack
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Jason Kirincich
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Igor V. Alabugin
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
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32
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Gao G, Gu FL, Jiang JX, Jiang K, Sheng CQ, Lai GQ, Xu LW. Neighboring Lithium-Assisted [1,2]-Wittig Rearrangement: Practical Access to Diarylmethanol-Based 1,4-Diols and Optically Active BINOL Derivatives with Axial and sp3-Central Chirality. Chemistry 2011; 17:2698-703. [DOI: 10.1002/chem.201003111] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2010] [Indexed: 11/08/2022]
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33
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Xie Y, Floreancig PE. Stereoselective heterocycle synthesis through a reversible allylic alcohol transposition and nucleophilic addition sequence. Chem Sci 2011. [DOI: 10.1039/c1sc00570g] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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34
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Ikemoto H, Sasaki M, Takeda K. Solvent Effects on the Steric Course of the [2,3]-Wittig Rearrangement of (S,E)-[3-(Allyloxy)prop-1-ene-1,3-diyl]dibenzene and Derivatives. European J Org Chem 2010. [DOI: 10.1002/ejoc.201001061] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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35
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Giampietro N, Wolfe J. Asymmetric Tandem Wittig Rearrangement/Mannich Reactions. Angew Chem Int Ed Engl 2010; 49:2922-4. [DOI: 10.1002/anie.201000609] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2010] [Indexed: 11/09/2022]
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36
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Giampietro N, Wolfe J. Asymmetric Tandem Wittig Rearrangement/Mannich Reactions. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201000609] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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37
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Yang J, Dudley GB. [1,2]-Anionic Rearrangement of 2-Benzyloxypyridine and Related Pyridyl Ethers. J Org Chem 2009; 74:7998-8000. [DOI: 10.1021/jo901707x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jingyue Yang
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390
| | - Gregory B. Dudley
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306-4390
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38
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Giampietro NC, Kampf JW, Wolfe JP. Asymmetric Tandem Wittig Rearrangement/Aldol Reactions. J Am Chem Soc 2009; 131:12556-7. [DOI: 10.1021/ja905930s] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Natalie C. Giampietro
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109-1055
| | - Jeff W. Kampf
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109-1055
| | - John P. Wolfe
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109-1055
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39
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Lygin AV, de Meijere A. Reactions of ortho-Lithiophenyl (-Hetaryl) Isocyanides with Carbonyl Compounds: Rearrangements of 2-Metalated 4H-3,1-Benzoxazines. J Org Chem 2009; 74:4554-9. [DOI: 10.1021/jo9004734] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alexander V. Lygin
- Institut für Organische und Biomolekulare Chemie der Georg-August-Universität Göttingen, Tammannstrasse 2, D-37077 Göttingen, Germany
| | - Armin de Meijere
- Institut für Organische und Biomolekulare Chemie der Georg-August-Universität Göttingen, Tammannstrasse 2, D-37077 Göttingen, Germany
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40
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Bertolli P, Farley RD, Fletcher MD, Horton PN, Hursthouse MB, Paradela C, von Vacano B. The [1,2]-thio-Wittig rearrangement: evidence for a radical mechanism and its suppression. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.08.140] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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41
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42
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Strunk S, Schlosser M. Wittig Rearrangement of Lithiated Allyl Aryl Ethers: A Mechanistic Study. European J Org Chem 2006. [DOI: 10.1002/ejoc.200600304] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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43
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Tayama E, Sugai S, Hara M. A facile and stereoselective synthetic method for allylic 1,3-dienyl ethers. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.08.100] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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44
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Bertrand MB, Wolfe JP. Tandem Wittig Rearrangement/Aldol Reactions for the Synthesis of Glycolate Aldols. Org Lett 2006; 8:4661-3. [PMID: 16986975 DOI: 10.1021/ol062016l] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new tandem Wittig Rearrangement/aldol reaction of O-benzyl or O-allyl glycolate esters is described. This reaction generates two carbon-carbon bonds and two contiguous stereocenters in a single step from simple starting materials. The [1,2]-Wittig rearrangement proceeds under very mild reaction conditions that do not require the use of a strong base, and the 1,2-diol products are obtained in good yield with excellent diastereoselectivity (>20:1).
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Affiliation(s)
- Myra Beaudoin Bertrand
- Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109-1055, USA
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45
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Onyeozili EN, Maleczka RE. alpha-Substituted acylsilanes via a highly selective [1,4]-Wittig rearrangement of alpha-benzyloxyallylsilane. Chem Commun (Camb) 2006:2466-8. [PMID: 16758017 DOI: 10.1039/b603228a] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
alpha-Benzyloxyallylsilane undergoes efficient [1,4]-Wittig rearrangement to generate an enolate intermediate that can be trapped with various electrophiles, thereby providing a new synthetic approach to substituted acylsilanes.
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Affiliation(s)
- Edith N Onyeozili
- Department of Chemistry, Michigan State University, 540 Chemistry, East Lansing, Michigan 48824, USA
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46
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47
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Miyata O, Koizumi T, Asai H, Iba R, Naito T. Imino 1,2-Wittig rearrangement of hydroximates and its application to synthesis of cytoxazone. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.02.048] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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48
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Li YJ, Lee PT, Yang CM, Chang YK, Weng YC, Liu YH. [2,3]-Wittig rearrangement of methyl β-pyrrolidinyl-γ-allyloxy-(E)-2-butenoate. Expeditious synthesis of 5-alkenyl-4-pyrrolidin-1-yl-5H-furan-2-ones. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.01.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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49
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Wipf P, Graham TH. Photoactivated Tungsten Hexacarbonyl-Catalyzed Conversion of Alkynols to Glycals. J Org Chem 2003; 68:8798-807. [PMID: 14604347 DOI: 10.1021/jo034813s] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The photoactivated W(CO)(6)/DABCO/THF system has been used for the formal endo-cyclization of alkynes to pyran rings. We found that the regioselectivity of ring closure depends on the relative configuration of the 3,5-dihydroxy-1-alkynes, as well as, more decisively, on the type of O-protective group. Oxygen substitution at the propargylic carbon slows the rate of alkyne insertion and allows for dihydrofuran formation through exo-cyclization. In contrast, the use of bulky silyl ethers or carbon substituents leads to dihydropyrans through endo-cyclization. Substrates bearing leaving groups such as esters, phenols, or thiophenols at the propargylic site eliminate and thus represent a limitation to the cycloisomerization methodology. Propargyl vinyl ethers will rearrange to give dienals instead of glycals. 1,2-Wittig rearrangement products of dihydropyrans are readily prepared and converted to complex bicyclic building blocks for organic synthesis.
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Affiliation(s)
- Peter Wipf
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, USA. pwipf+@pitt.edu
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50
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Enantioselective Synthesis by Lithiation Adjacent to Oxygen and Subsequent Rearrangement. TOP ORGANOMETAL CHEM 2003. [DOI: 10.1007/3-540-36117-0_7] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
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