151
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Pous J, Courant T, Bernadat G, Iorga BI, Blanchard F, Masson G. Regio-, Diastereo-, and Enantioselective Nitroso-Diels–Alder Reaction of 1,3-Diene-1-carbamates Catalyzed by Chiral Phosphoric Acids. J Am Chem Soc 2015; 137:11950-3. [DOI: 10.1021/jacs.5b08515] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Jonathan Pous
- Institut
de Chimie des Substances Naturelles CNRS, Université Paris-Sud, 1 Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
| | - Thibaut Courant
- Institut
de Chimie des Substances Naturelles CNRS, Université Paris-Sud, 1 Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
| | - Guillaume Bernadat
- Équipe
Molécules Fluorées et Chimie Médicinale, Laboratoire
BioCIS (UMR-8076) − Faculté de Pharmacie, 5 Rue J.-B. Clément, 92296 Châtenay-Malabry Cedex, France
| | - Bogdan I. Iorga
- Institut
de Chimie des Substances Naturelles CNRS, Université Paris-Sud, 1 Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
| | - Florent Blanchard
- Institut
de Chimie des Substances Naturelles CNRS, Université Paris-Sud, 1 Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
| | - Géraldine Masson
- Institut
de Chimie des Substances Naturelles CNRS, Université Paris-Sud, 1 Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
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152
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Zhang X, Xu XM, Zhao L, You J, Zhu J, Wang MX. Synthesis of diverse di- to penta-substituted 1,2-dihydropyridine derivatives from gold(I)-catalyzed intramolecular addition of tertiary enamides to alkynes. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.04.105] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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153
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Sato S, Takeda N, Miyoshi T, Ueda M, Miyata O. Vicinal Functionalization ofN-Alkoxyenamines: Tandem Umpolung Phenylation-Nucleophilic Addition Reaction Sequence. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500308] [Citation(s) in RCA: 8] [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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154
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Meiresonne T, Verniest G, De Kimpe N, Mangelinckx S. Synthesis of 2-Fluoro-1,4-benzoxazines and 2-Fluoro-1,4-benzoxazepin-5-ones by Exploring the Nucleophilic Vinylic Substitution (SNV) Reaction of gem-Difluoroenamides. J Org Chem 2015; 80:5111-24. [DOI: 10.1021/acs.joc.5b00507] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tamara Meiresonne
- Department of Sustainable
Organic Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Guido Verniest
- Department of Sustainable
Organic Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Norbert De Kimpe
- Department of Sustainable
Organic Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Sven Mangelinckx
- Department of Sustainable
Organic Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
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155
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Lebée C, Kataja AO, Blanchard F, Masson G. Formal Asymmetric Organocatalytic [3+2] Cyclization between Enecarbamates and 3-Indolylmethanols: Rapid Access to 3-Aminocyclopenta[b]indoles. Chemistry 2015; 21:8399-402. [DOI: 10.1002/chem.201500749] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Indexed: 12/15/2022]
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156
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Caillot G, Dufour J, Belhomme MC, Poisson T, Grimaud L, Pannecoucke X, Gillaizeau I. Copper-catalyzed olefinic C-H difluoroacetylation of enamides. Chem Commun (Camb) 2015; 50:5887-90. [PMID: 24760345 DOI: 10.1039/c4cc01994f] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Copper-catalyzed olefinic difluoroacetylation of enamides via direct C-H bond functionalization using BrCF2CO2Et is reported for the first time. It constitutes an efficient radical-free method for the regioselective synthesis of β-difluoroester substituted enamides which exhibits broad substrate scope, and thus demonstrates its potent application in a late stage fluorination strategy.
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Affiliation(s)
- Gilles Caillot
- Institut de Chimie Organique et Analytique, UMR 7311 CNRS, Université d'Orléans, rue de Chartres, 45067 Orléans cedex 2, France.
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157
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Maity B, Gooßen LJ, Koley D. Computational study of the mechanism and selectivity of ruthenium-catalyzed hydroamidations of terminal alkynes. Chem Sci 2015; 6:2532-2552. [PMID: 28808524 PMCID: PMC5539791 DOI: 10.1039/c4sc03906h] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Accepted: 02/16/2015] [Indexed: 11/21/2022] Open
Abstract
Density functional theory calculations were performed to elucidate the mechanism of the ruthenium-catalyzed hydroamidation of terminal alkynes, a powerful and sustainable method for the stereoselective synthesis of enamides. The results provide an explanation for the puzzling experimental finding that with tri-n-butylphosphine (P(Bu)3) as the ligand, the E-configured enamides are obtained, whereas the stereoselectivity is inverted in favor of the Z-configured enamides with (dicyclohexylphosphino)methane (dcypm) ligands. Using the addition of pyrrolidinone to 1-hexyne as a model reaction, various pathways were investigated, among which a catalytic cycle turned out to be most advantageous for both ligand systems that consists of: (a) oxidative addition, (b) alkyne coordination, (c) alkyne insertion (d) vinyl-vinylidene rearrangement, (e) nucleophilic transfer and finally (f) reductive elimination. The stereoselectivity of the reaction is decided in the nucleophilic transfer step. For the P( n Bu)3 ligand, the butyl moiety is oriented anti to the incoming 2-pyrolidinyl unit during the nucleophilic transfer step, whereas for the dcypm ligand, steric repulsion between the butyl and cyclohexyl groups turns it into a syn orientation. Overall, the formation of E-configured product is favorable by 4.8 kcal mol-1 (Δ‡GSDL) for the catalytic cycle computed with P(Bu)3 as ancillary ligand, whereas for the catalytic cycle computed with dcypm ligands, the Z-product is favored by 7.0 kcal mol-1 (Δ‡GSDL). These calculations are in excellent agreement with experimental findings.
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Affiliation(s)
- Bholanath Maity
- Department of Chemical Sciences , Indian Institute of Science Education and Research (IISER) Kolkata , Mohanpur 741246 , India .
| | - Lukas J Gooßen
- Fachbereich Chemie , TU Kaiserslautern , Erwin-Schrödinger-Straβe 54 , D-67663 Kaiserslautern , Germany .
| | - Debasis Koley
- Department of Chemical Sciences , Indian Institute of Science Education and Research (IISER) Kolkata , Mohanpur 741246 , India .
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158
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Cobalt-catalyzed arylation and alkenylation of alpha-bromo eneformamides and enecarbamates by cross-coupling with organic bromides: Application to the synthesis of functionalized piperidines and azepanes. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.01.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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159
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Huang L, Arndt M, Gooßen K, Heydt H, Gooßen LJ. Late Transition Metal-Catalyzed Hydroamination and Hydroamidation. Chem Rev 2015; 115:2596-697. [DOI: 10.1021/cr300389u] [Citation(s) in RCA: 739] [Impact Index Per Article: 82.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Liangbin Huang
- Department of Chemistry, TU Kaiserslautern, Erwin-Schrödinger-Strasse Geb. 54, 67663 Kaiserslautern, Germany
| | - Matthias Arndt
- Department of Chemistry, TU Kaiserslautern, Erwin-Schrödinger-Strasse Geb. 54, 67663 Kaiserslautern, Germany
| | - Käthe Gooßen
- Department of Chemistry, TU Kaiserslautern, Erwin-Schrödinger-Strasse Geb. 54, 67663 Kaiserslautern, Germany
| | - Heinrich Heydt
- Department of Chemistry, TU Kaiserslautern, Erwin-Schrödinger-Strasse Geb. 54, 67663 Kaiserslautern, Germany
| | - Lukas J. Gooßen
- Department of Chemistry, TU Kaiserslautern, Erwin-Schrödinger-Strasse Geb. 54, 67663 Kaiserslautern, Germany
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160
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Szudkowska-Frątczak J, Zaranek M, Hreczycho G, Kubicki M, Grabarkiewicz T, Pawluć P. A silicon-assisted synthesis of (E)-β-haloenamides fromN-vinylamides. Appl Organomet Chem 2015. [DOI: 10.1002/aoc.3284] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
| | - Maciej Zaranek
- Faculty of Chemistry; Adam Mickiewicz University in Poznan; Umultowska 89b 61-614 Poznan Poland
| | - Grzegorz Hreczycho
- Faculty of Chemistry; Adam Mickiewicz University in Poznan; Umultowska 89b 61-614 Poznan Poland
| | - Maciej Kubicki
- Faculty of Chemistry; Adam Mickiewicz University in Poznan; Umultowska 89b 61-614 Poznan Poland
| | | | - Piotr Pawluć
- Faculty of Chemistry; Adam Mickiewicz University in Poznan; Umultowska 89b 61-614 Poznan Poland
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161
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Xu YS, Tang Y, Feng HJ, Liu JT, Hsung RP. A highly regio- and stereoselective synthesis of α-fluorinated imides via fluorination of chiral enamides. Org Lett 2015; 17:572-5. [PMID: 25582419 PMCID: PMC4540344 DOI: 10.1021/ol503591d] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A highly π-facial selective and regioselective fluorination of chiral enamides is described. The reaction involves an enantioselective fluorination exclusively at the electron-rich enamide olefin with N-F reagents such as Selectfluor and N-fluoro-benzenesulfonimide [NFSI] accompanied by trapping of the β-fluoro-iminium cationic intermediate with water. The resulting N,O-hemiacetal could be oxidized using Dess-Martin periodinane, leading to an asymmetric sequence for syntheses of chiral α-fluoro-imides and optically enriched α-fluoro-ketones.
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Affiliation(s)
- Yan-Shuang Xu
- School of Pharmaceutical Science and Technology, Key Laboratory for Modern Drug Delivery and High-Efficiency, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin, 300072 P. R. China
| | - Yu Tang
- School of Pharmaceutical Science and Technology, Key Laboratory for Modern Drug Delivery and High-Efficiency, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin, 300072 P. R. China
| | - He-Jing Feng
- School of Pharmaceutical Science and Technology, Key Laboratory for Modern Drug Delivery and High-Efficiency, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin, 300072 P. R. China
| | - Ji-Tian Liu
- School of Pharmaceutical Science and Technology, Key Laboratory for Modern Drug Delivery and High-Efficiency, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin, 300072 P. R. China
| | - Richard P. Hsung
- Division of Pharmaceutical Sciences, School of Pharmacy, and Department of Chemistry, University of Wisconsin, Madison, WI 53705 USA
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162
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Besset T, Poisson T, Pannecoucke X. Direct Vicinal Difunctionalization of Alkynes: An Efficient Approach Towards the Synthesis of Highly Functionalized Fluorinated Alkenes. European J Org Chem 2015. [DOI: 10.1002/ejoc.201403507] [Citation(s) in RCA: 98] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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163
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Tian L, Cui C, Zhu C, Yang HH, Li JQ, Zhao WG. Novel exocyclic enamides: synthesis and evaluation of the fungicidal activities of 5-methylene-2-(trifluoromethyl)morpholin-3-one derivatives. RSC Adv 2015. [DOI: 10.1039/c5ra20138a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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164
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He L, Liu HB, Zhao L, Wang DX, Wang MX. Lewis acid-catalyzed reaction between tertiary enamides and imines of salicylaldehydes: expedient synthesis of novel 4-chromanamine derivatives. Tetrahedron 2015. [DOI: 10.1016/j.tet.2014.12.050] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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165
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Dwivedi V, Hari Babu M, Kant R, Sridhar Reddy M. N-Substitution dependent stereoselectivity switch in palladium catalyzed hydroalkynylation of ynamides: a regio and stereoselective synthesis of ynenamides. Chem Commun (Camb) 2015; 51:14996-9. [DOI: 10.1039/c5cc06251a] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
A palladium catalysed regioselective hydroalkynylation of ynamides for ynenamides is achieved with an N-substitution dependent stereoselectivity switch.
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Affiliation(s)
- Vikas Dwivedi
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
| | - Madala Hari Babu
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
| | - Ruchir Kant
- Molecular & Structural Biology Division
- CSIR-CDRI
- Lucknow 226031
- India
| | - Maddi Sridhar Reddy
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
- Academy of Scientific and Innovative Research
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166
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Nandi GC, Kota SR, Wakchaure PB, Chinthakindi PK, Govender T, Kruger HG, Naicker T, Arvidsson PI. Pd-catalyzed C–N coupling of vinylbromides and sulfonimidamides: a facile synthesis of N′-vinylsulfonimidamides. RSC Adv 2015. [DOI: 10.1039/c5ra10939f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
N′-Vinyl sulfonimidamides were synthesized through Pd-catalyzed C–N coupling; the product's utility were further demonstrated by preparing N′-alkyl sulfonimidamides through hydrogenation.
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Affiliation(s)
- Ganesh C. Nandi
- Catalysis and Peptide Research Unit
- University of KwaZulu-Natal
- Durban
- South Africa
- Organic Chemistry Section
| | - Sudhakar R. Kota
- Catalysis and Peptide Research Unit
- University of KwaZulu-Natal
- Durban
- South Africa
| | - Prasad B. Wakchaure
- Organic Pharmaceutical Chemistry
- Department of Medicinal Chemistry
- Uppsala Biomedical Center
- Uppsala University
- 751 23 Uppsala
| | | | - Thavendran Govender
- Catalysis and Peptide Research Unit
- University of KwaZulu-Natal
- Durban
- South Africa
| | - Hendrick G. Kruger
- Catalysis and Peptide Research Unit
- University of KwaZulu-Natal
- Durban
- South Africa
| | - Tricia Naicker
- Catalysis and Peptide Research Unit
- University of KwaZulu-Natal
- Durban
- South Africa
| | - Per I. Arvidsson
- Catalysis and Peptide Research Unit
- University of KwaZulu-Natal
- Durban
- South Africa
- Science for Life Laboratory
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167
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Bassler DP, Spence L, Alwali A, Beale O, Beng TK. Expedient access to α,β-difunctionalized azepenes using α-halo eneformamides: application to the one-pot synthesis of 2-benzazepanes. Org Biomol Chem 2015; 13:2285-92. [DOI: 10.1039/c4ob02183e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The regioselective synthesis of α,β-difunctionalized (alkenyl, aryl, sulfonyl, allyl, or alkynyl) azepenes has been accomplished through α-halo eneformamides.
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Affiliation(s)
| | - Laura Spence
- Department of Chemistry
- Susquehanna University
- Selinsgrove
- USA
| | - Amir Alwali
- Department of Chemistry
- Susquehanna University
- Selinsgrove
- USA
| | - Oliver Beale
- Department of Chemistry
- Susquehanna University
- Selinsgrove
- USA
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168
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Li Y, Zhou X, Wu Z, Cao J, Ma C, He Y, Huang G. Metal free synthesis of 2,4-diarylquinoline derivatives with enamides and imines. RSC Adv 2015. [DOI: 10.1039/c5ra17823a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
A simple and efficient way to construct quinoline derivatives using enamides and imines in metal free condition.
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Affiliation(s)
- Yamin Li
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- Department of Chemistry
- Lanzhou University
- Lanzhou
| | - Xiaoqiang Zhou
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- Department of Chemistry
- Lanzhou University
- Lanzhou
| | - Zhaoyang Wu
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- Department of Chemistry
- Lanzhou University
- Lanzhou
| | - Jinhui Cao
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- Department of Chemistry
- Lanzhou University
- Lanzhou
| | - Chaowei Ma
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- Department of Chemistry
- Lanzhou University
- Lanzhou
| | - Yongqin He
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- Department of Chemistry
- Lanzhou University
- Lanzhou
| | - Guosheng Huang
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- Department of Chemistry
- Lanzhou University
- Lanzhou
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169
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Wu K, Zhuo MH, Sha D, Fan YS, An D, Jiang YJ, Zhang S. H8-BINOL chiral imidodiphosphoric acid catalyzed highly enantioselective aza-Friedel–Crafts reactions of pyrroles and enamides/imines. Chem Commun (Camb) 2015; 51:8054-7. [DOI: 10.1039/c5cc00685f] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
H8-BINOL-type imidodiphosphoric acid (0.3–2 mol%) catalyzed highly enantioselective aza-Friedel–Crafts reactions of pyrroles and enamides/imines have been developed.
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Affiliation(s)
- Kun Wu
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
| | - Ming-Hua Zhuo
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
| | - Di Sha
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
| | - Yan-Sen Fan
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
| | - Dong An
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
| | - Yi-Jun Jiang
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
| | - Suoqin Zhang
- College of Chemistry
- Jilin University
- Changchun 130012
- P. R. China
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170
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Tahara A. Regio- and Stereoselective Synthesis of Multisubstituted Enamides by Treatment of Ynamides with Boronic Acids. J SYN ORG CHEM JPN 2015. [DOI: 10.5059/yukigoseikyokaishi.73.749] [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]
Affiliation(s)
- Atsushi Tahara
- Institute for Materials Chemistry and Engineering, Kyushu University
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171
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Saha S, Schneider C. Brønsted Acid-Catalyzed, Highly Enantioselective Addition of Enamides to In Situ-Generatedortho-Quinone Methides: A Domino Approach to Complex Acetamidotetrahydroxanthenes. Chemistry 2014; 21:2348-52. [DOI: 10.1002/chem.201406044] [Citation(s) in RCA: 131] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Indexed: 11/09/2022]
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172
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St Denis JD, Zajdlik A, Tan J, Trinchera P, Lee CF, He Z, Adachi S, Yudin AK. Boron-containing enamine and enamide linchpins in the synthesis of nitrogen heterocycles. J Am Chem Soc 2014; 136:17669-73. [PMID: 25422871 DOI: 10.1021/ja510963k] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The use of α-boryl enamine and enamide linchpins in the synthesis of nitrogen heterocycles has been demonstrated. Boryl enamines provide ready access to the corresponding α-halo aldehydes, which undergo regioselective annulation to form borylated thiazoles. A condensation/amidation sequence converts α-boryl aldehydes into stable α-boryl enamides without concomitant C → N migration. We also show that palladium-catalyzed cyclization of α-boryl enamides leads to synthetically versatile isoindolones. These molecules can be subsequently used to access polycyclic scaffolds.
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Affiliation(s)
- Jeffrey D St Denis
- Davenport Research Laboratories, Department of Chemistry, University of Toronto , 80 St. George Street, Toronto, Ontario, Canada M5S 3H6
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173
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He L, Zhao L, Wang DX, Wang MX. Catalytic Asymmetric Difunctionalization of Stable Tertiary Enamides with Salicylaldehydes: Highly Efficient, Enantioselective, and Diastereoselective Synthesis of Diverse 4-Chromanol Derivatives. Org Lett 2014; 16:5972-5. [DOI: 10.1021/ol5029964] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ling He
- Beijing
National Laboratory for Molecular Sciences, CAS Key Laboratory of
Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Liang Zhao
- MOE
Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, Tsinghua University, Beijing 100184, China
| | - De-Xian Wang
- Beijing
National Laboratory for Molecular Sciences, CAS Key Laboratory of
Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Mei-Xiang Wang
- MOE
Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, Tsinghua University, Beijing 100184, China
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174
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Gigant N, Honraedt A, Gras E, Gillaizeau I. Efficient Cross-Coupling of Dioxazaborocanes with α-Phosphate Enamides. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402927] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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175
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Yang Y, Wang L, Zhang F, Zhu G. Preparation of (Z)-α,β-disubstituted enamides via palladium-catalyzed addition of boronic acids to ynamides. J Org Chem 2014; 79:9319-24. [PMID: 25229505 DOI: 10.1021/jo501894j] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A Pd-catalyzed, highly regio- and stereoselective addition of boronic acids to ynamides has been realized. This protocol generates (Z)-α,β-disubstituted enamides in high yields with excellent regio- and stereoselectivity under the mild reaction conditions, thereby providing a good complementary method for the diverse synthesis of multifunctional enamides. A wide collection of functional groups are found to be tolerated. It represents a straightforward and useful means to assemble stereodefined enamides from readily available starting materials.
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Affiliation(s)
- Yuanfa Yang
- Department of Chemistry, Zhejiang Normal University , 688 Yingbin Road, Jinhua 321004, China
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176
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Prakash M, Muthusamy S, Kesavan V. Copper(I) Bromide Catalyzed Arylation of Cyclic Enamides and Naphthyl-1-acetamides Using Diaryliodonium Salts. J Org Chem 2014; 79:7836-43. [DOI: 10.1021/jo501162s] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Muthuraj Prakash
- Chemical Biology Lab, Department
of Biotechnology, Bhupat and Jyothi Mehta School of Biosciences Building, Indian Institute of Technology Madras, Chennai-600036, India
| | - Subramaniam Muthusamy
- Chemical Biology Lab, Department
of Biotechnology, Bhupat and Jyothi Mehta School of Biosciences Building, Indian Institute of Technology Madras, Chennai-600036, India
| | - Venkitasamy Kesavan
- Chemical Biology Lab, Department
of Biotechnology, Bhupat and Jyothi Mehta School of Biosciences Building, Indian Institute of Technology Madras, Chennai-600036, India
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177
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Gigant N, Chausset-Boissarie L, Gillaizeau I. Direct metal-catalyzed regioselective functionalization of enamides. Chemistry 2014; 20:7548-64. [PMID: 24862089 DOI: 10.1002/chem.201402070] [Citation(s) in RCA: 101] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Enamides are stable enamine surrogates and provide key intermediates for the synthesis of small but complex nitrogen-containing compounds. Metal-catalyzed regioselective functionalization of enamides provides a rapid method to synthesize useful nitrogen containing heterocycles. This review discloses the recent progress made in the development of the C-H functionalization of enamides involving efficient and atom-economical routes. Syntheses of different heterocycles are classified based on the site reactivity of enamides and key mechanistic insights are given for each transformation.
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Affiliation(s)
- Nicolas Gigant
- Institut de Chimie Organique et Analytique, UMR 7311, CNRS, Université d'Orléans, rue de Chartres, 45067 Orléans cedex 2 (France), Fax: (+33) 2-38-41-72-81
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178
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Affiliation(s)
- Dongari Yadagiri
- Department of Chemistry, Indian Institute of Technology Madras, Chennai − 600036, India
| | - Pazhamalai Anbarasan
- Department of Chemistry, Indian Institute of Technology Madras, Chennai − 600036, India
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179
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180
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Beng TK, Wilkerson-Hill SM, Sarpong R. Direct access to functionalized azepanes by cross-coupling with α-halo eneformamides. Org Lett 2014; 16:916-9. [PMID: 24456197 PMCID: PMC3993866 DOI: 10.1021/ol403671s] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
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The
synthesis of functionalized azepanes was accomplished through
the palladium-mediated cross-coupling of α-halo eneformamides
with mostly unactivated nucleophiles under mild conditions. Alkenylations
proceeded with excellent stereoselectivitiy. In most cases, high yields
of the coupling products were obtained.
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Affiliation(s)
- Timothy K Beng
- Department of Chemistry, University of California , Berkeley, California 94720, United States
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181
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Zhao MN, Ren ZH, Wang YY, Guan ZH. Pd-Catalyzed Oxidative Coupling of Enamides and Alkynes for Synthesis of Substituted Pyrroles. Org Lett 2014; 16:608-11. [DOI: 10.1021/ol403517p] [Citation(s) in RCA: 124] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Mi-Na Zhao
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, Northwest University, Xi’an 710069, P. R. China
| | - Zhi-Hui Ren
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, Northwest University, Xi’an 710069, P. R. China
| | - Yao-Yu Wang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, Northwest University, Xi’an 710069, P. R. China
| | - Zheng-Hui Guan
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, Northwest University, Xi’an 710069, P. R. China
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182
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Feng C, Feng D, Loh TP. Rhodium(iii)-catalyzed olefinic C–H alkynylation of enamides at room temperature. Chem Commun (Camb) 2014; 50:9865-8. [DOI: 10.1039/c4cc04072d] [Citation(s) in RCA: 115] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Rh(iii)-catalyzed C–H olefinic alkynylation of enamides for the stereospecific construction of synthetically useful Z-type enynamides is reported. This protocol displays good functionality tolerance and operational simplicity thus providing an alternative synthetic opportunity for the ease of access to specific 1,3-enyne derivatives.
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Affiliation(s)
- Chao Feng
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- , Singapore
| | - Daming Feng
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- , Singapore
| | - Teck-Peng Loh
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
- Nanyang Technological University
- , Singapore
- Department of Chemistry
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183
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Yang Y, Wang L, Zhang J, Jin Y, Zhu G. An unprecedented Pd-catalyzed trans-addition of boronic acids to ynamides. Chem Commun (Camb) 2014; 50:2347-9. [DOI: 10.1039/c3cc49069f] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An unusual Pd-catalyzed trans-addition of boronic acids to ynamides has been realized in this paper, providing α,β-disubstituted enamides in good yields with excellent regio- and stereoselectivity.
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Affiliation(s)
- Yuanfa Yang
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang Normal University
- Jinhua 321004, China
| | - Lina Wang
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang Normal University
- Jinhua 321004, China
| | - Jieni Zhang
- Department of Chemistry
- Zhejiang Normal University
- Jinhua 321004, China
| | - Yali Jin
- Department of Chemistry
- Zhejiang Normal University
- Jinhua 321004, China
| | - Gangguo Zhu
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang Normal University
- Jinhua 321004, China
- Department of Chemistry
- Zhejiang Normal University
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184
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Xu YH, He T, Zhang QC, Loh TP. Synthesis of multi-substituted pyrroles using enamides and alkynes catalyzed by Pd(OAc)2 with molecular oxygen as an oxidant. Chem Commun (Camb) 2014; 50:2784-6. [DOI: 10.1039/c3cc49683j] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A cyclization reaction between enamides and alkynes catalyzed by palladium(ii) acetate is described. In this method, the molecular oxygen serves as an efficient oxidant for the Pd(ii)/Pd(0) catalytic cycle. The simple reaction conditions permit this methodology to be used as a general tool for the preparation of multi-substituted pyrroles.
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Affiliation(s)
- Yun-He Xu
- Department of Chemistry
- University of Science and Technology of China
- Hefei, P.R. China
| | - Tao He
- Department of Chemistry
- University of Science and Technology of China
- Hefei, P.R. China
| | - Qiu-Chi Zhang
- Department of Chemistry
- University of Science and Technology of China
- Hefei, P.R. China
| | - Teck-Peng Loh
- Department of Chemistry
- University of Science and Technology of China
- Hefei, P.R. China
- Division of Chemistry and Biological Chemistry
- School of Physical and Mathematical Sciences
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185
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Lei ZQ, Ye JH, Sun J, Shi ZJ. Direct alkenyl C–H functionalization of cyclic enamines with carboxylic acids via Rh catalysis assisted by hydrogen bonding. Org Chem Front 2014. [DOI: 10.1039/c4qo00074a] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Enamines and enamides are important synthetic intermediates.
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Affiliation(s)
- Zhi-Quan Lei
- Chengdu Institute of Biology
- Chinese Academy of Sciences
- Chengdu, China
| | - Jian-Heng Ye
- Chengdu Institute of Biology
- Chinese Academy of Sciences
- Chengdu, China
| | - Jian Sun
- Chengdu Institute of Biology
- Chinese Academy of Sciences
- Chengdu, China
| | - Zhang-Jie Shi
- Beijing National Laboratory of Molecular Sciences (BNLMS) and Key Laboratory of Bioorganic Chemistry and Molecular Engineering of the Ministry of Education
- College of Chemistry and Green Chemistry Center
- Peking University
- Beijing 100871, China
- State Key Laboratory of Organometallic Chemistry
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186
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Lei CH, Wang DX, Zhao L, Zhu J, Wang MX. Synthesis of Multifunctionalized 1,2,3,4-Tetrahydropyridines, 2,3-Dihydropyridin-4(1H)-ones, and Pyridines from Tandem Reactions Initiated by [5+1] Cycloaddition of N-Formylmethyl-Substituted Enamides to Isocyanides: Mechanistic Insight and Synthetic Appl. Chemistry 2013; 19:16981-7. [DOI: 10.1002/chem.201303221] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Indexed: 11/06/2022]
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187
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FeCl3-Catalyzed Self-Condensation of Enamides for the Synthesis of Enamido-Substituted Nitrogen-Containing Quaternary Carbon Centers. European J Org Chem 2013. [DOI: 10.1002/ejoc.201301005] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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188
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Yu YF, Shu C, Shen CH, Li TY, Ye LW. Gold-Catalyzed Tandem Cycloisomerization and Dimerization of Chiral Homopropargyl Sulfonamides. Chem Asian J 2013; 8:2920-4. [DOI: 10.1002/asia.201301058] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Indexed: 01/13/2023]
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189
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Liu H, Zhou Y, Yan X, Chen C, Liu Q, Xi C. Copper-mediated amidation of alkenylzirconocenes with acyl azides: formation of enamides. Org Lett 2013; 15:5174-7. [PMID: 24083640 DOI: 10.1021/ol402212g] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Copper-mediated amidation of alkenylzirconocenes generated in situ from alkynes and zirconocenes with acyl azides is accomplished under mild conditions. The reaction can be used to prepare various enamides.
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Affiliation(s)
- Hailan Liu
- Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology (Ministry of Education), Department of Chemistry, Tsinghua University , Beijing 100084, China , and Institute of Chemistry and Chemical Engineering, Hebei Normal University , Shijiazhuang 050091, China
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190
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Fang LC, Hsung RP, Ma ZX, Presser WR. A highly stereoselective Diels-Alder cycloaddition of enones with chiral cyclic 2-amidodienes derived from allenamides. Org Lett 2013; 15:4842-5. [PMID: 24001055 DOI: 10.1021/ol402254p] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Lewis acid promoted Diels-Alder cycloadditions of a series of de novo chiral cyclic 2-amidodienes are described. These cyclic 2-amidodienes are derived from chiral α-allyl allenamides via a sequence of E-selective 1,3-H shift and 6π-electron pericyclic ring closure. With enones serving as effective dienophiles, these cycloadditions can be highly diastereoselective depending upon the chiral amide substituent, thereby representing a facile entry to optically enriched [2.2.2]bicyclic manifolds.
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Affiliation(s)
- Li-Chao Fang
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin , Madison, Wisconsin 53705, United States
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191
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Liwosz TW, Chemler SR. Copper-catalyzed oxidative amination and allylic amination of alkenes. Chemistry 2013; 19:12771-7. [PMID: 23878099 PMCID: PMC4038966 DOI: 10.1002/chem.201301800] [Citation(s) in RCA: 118] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2013] [Indexed: 11/09/2022]
Abstract
Enamines and enamides are useful synthetic intermediates and common components of bioactive compounds. A new protocol for their direct synthesis by a net alkene C-H amination and allylic amination by using catalytic Cu(II) in the presence of MnO2 is reported. Reactions between N-aryl sulfonamides and vinyl arenes furnish enamides, allylic amines, indoles, benzothiazine dioxides, and dibenzazepines directly and efficiently. Control experiments further showed that MnO2 alone can promote the reaction in the absence of a copper salt, albeit with lower efficiency. Mechanistic probes support the involvement of nitrogen-radical intermediates. This method is ideal for the synthesis of enamides from 1,1-disubstituted vinyl arenes, which are uncommon substrates in existing oxidative amination protocols.
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Affiliation(s)
| | - Sherry R. Chemler
- Department of Chemistry, The State University of New York at Buffalo, Buffalo, NY 14260 (USA)
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192
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He G, Zhang Q, Huang H, Chen S, Wang Q, Zhang D, Zhang R, Zhu H. Copper(I)-Catalyzed Highly Regio- and Stereoselective Boron Addition-Protonolysis of Alkynamides to give Alkenamides. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300947] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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193
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He L, Laurent G, Retailleau P, Folléas B, Brayer JL, Masson G. Highly Enantioselective Aza-Diels-Alder Reaction of 1-Azadienes with Enecarbamates Catalyzed by Chiral Phosphoric Acids. Angew Chem Int Ed Engl 2013; 52:11088-91. [DOI: 10.1002/anie.201304969] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Revised: 07/05/2013] [Indexed: 12/14/2022]
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194
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He L, Laurent G, Retailleau P, Folléas B, Brayer JL, Masson G. Highly Enantioselective Aza-Diels-Alder Reaction of 1-Azadienes with Enecarbamates Catalyzed by Chiral Phosphoric Acids. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201304969] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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195
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Ryu J, Kwak J, Shin K, Lee D, Chang S. Ir(III)-Catalyzed Mild C–H Amidation of Arenes and Alkenes: An Efficient Usage of Acyl Azides as the Nitrogen Source. J Am Chem Soc 2013; 135:12861-8. [DOI: 10.1021/ja406383h] [Citation(s) in RCA: 260] [Impact Index Per Article: 23.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Jaeyune Ryu
- Center for Catalytic
Hydrocarbon
Functionalizations, Institute of Basic Science (IBS), Daejeon 305-701, Republic of Korea
- Department of Chemistry, Korea Advanced Institute of Science & Technology (KAIST), Daejeon 305-701, Republic of Korea
| | - Jaesung Kwak
- Center for Catalytic
Hydrocarbon
Functionalizations, Institute of Basic Science (IBS), Daejeon 305-701, Republic of Korea
- Department of Chemistry, Korea Advanced Institute of Science & Technology (KAIST), Daejeon 305-701, Republic of Korea
| | - Kwangmin Shin
- Center for Catalytic
Hydrocarbon
Functionalizations, Institute of Basic Science (IBS), Daejeon 305-701, Republic of Korea
- Department of Chemistry, Korea Advanced Institute of Science & Technology (KAIST), Daejeon 305-701, Republic of Korea
| | - Donggun Lee
- Center for Catalytic
Hydrocarbon
Functionalizations, Institute of Basic Science (IBS), Daejeon 305-701, Republic of Korea
- Department of Chemistry, Korea Advanced Institute of Science & Technology (KAIST), Daejeon 305-701, Republic of Korea
| | - Sukbok Chang
- Center for Catalytic
Hydrocarbon
Functionalizations, Institute of Basic Science (IBS), Daejeon 305-701, Republic of Korea
- Department of Chemistry, Korea Advanced Institute of Science & Technology (KAIST), Daejeon 305-701, Republic of Korea
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196
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Lu T, Lu Z, Ma ZX, Zhang Y, Hsung RP. Allenamides: a powerful and versatile building block in organic synthesis. Chem Rev 2013; 113:4862-904. [PMID: 23550917 PMCID: PMC4539064 DOI: 10.1021/cr400015d] [Citation(s) in RCA: 272] [Impact Index Per Article: 24.7] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Ting Lu
- Division of Pharmaceutical Sciences, School of Pharmacy, University of Wisconsin, Madison, WI 53705
| | - Zhenjie Lu
- Division of Pharmaceutical Sciences, School of Pharmacy, University of Wisconsin, Madison, WI 53705
| | - Zhi-Xiong Ma
- Division of Pharmaceutical Sciences, School of Pharmacy, University of Wisconsin, Madison, WI 53705
| | - Yu Zhang
- Discovery Research, Dow AgroSciences LLC, Indianapolis, IN 46268
| | - Richard P. Hsung
- Division of Pharmaceutical Sciences, School of Pharmacy, University of Wisconsin, Madison, WI 53705
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197
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Bekkaye M, Su Y, Masson G. Metal-Free Dioxygenation of Enecarbamates Mediated by a Hypervalent Iodine Reagent. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300501] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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198
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Liu H, Yan X, Chen C, Liu Q, Xi C. Copper-mediated electrophilic imination of alkenylzirconocenes with O-benzoyl ketoximes and aldoximes. Chem Commun (Camb) 2013; 49:5513-5. [PMID: 23660950 DOI: 10.1039/c3cc41574k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Copper-mediated electrophilic imination of alkenylzirconocenes generated in situ from alkynes and zirconocenes is accomplished under mild reaction conditions. The reaction can be used to prepare various 2-azadienes.
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Affiliation(s)
- Hailan Liu
- Institute of Chemistry and Chemical Engineering, Hebei Normal University, Shijiazhuang 050091, China
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199
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Lefranc J, Minassi A, Clayden J. Carbolithiation of N-alkenyl ureas and N-alkenyl carbamates. Beilstein J Org Chem 2013; 9:628-32. [PMID: 23616806 PMCID: PMC3628850 DOI: 10.3762/bjoc.9.70] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2013] [Accepted: 02/24/2013] [Indexed: 11/23/2022] Open
Abstract
N-Alkenyl ureas and N-alkenyl carbamates, like other N-acyl enamines, are typically nucleophilic at their β-carbon. However, by incorporating an α-aryl substituent, we show that they will also undergo attack at the β-carbon by organolithium nucleophiles, leading to the products of carbolithiation. The carbolithiation of E and Z N-alkenyl ureas is diastereospecific, and N-tert-butoxycarbonyl N-alkenyl carbamates give carbolithiation products that may be deprotected in situ to provide a new connective route to hindered amines.
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Affiliation(s)
- Julien Lefranc
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, UK
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200
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Senczyszyn J, Brice H, Clayden J. Spirocyclic Dihydropyridines by Electrophile-Induced Dearomatizing Cyclization of N-Alkenyl Pyridinecarboxamides. Org Lett 2013; 15:1922-5. [DOI: 10.1021/ol400571j] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Jemma Senczyszyn
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Heloise Brice
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Jonathan Clayden
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
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