1
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Yuan H, Wu YZ, Fang YH, Chen CH, Liang C, Mo DL. Synthesis of Spirooxindole-1,2-oxazinan-5-ones through 2,2,2-Trifluoroethanol Promoted [3 + 3] Cycloaddition of N-Vinyl Oxindole Nitrones and Oxyallyl Cations. J Org Chem 2023; 88:16155-16166. [PMID: 37975833 DOI: 10.1021/acs.joc.3c01477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2023]
Abstract
A variety of spirooxindole-1,2-oxazinan-5-one derivatives were prepared in moderate to excellent yields through 2,2,2-trifluoroethanol (TFE)-promoted [3 + 3] cycloaddition of N-vinyl oxindole nitrones with oxyallyl cations generated from α-tosyloxy ketones under mild reaction conditions. Mechanistic studies revealed that [3 + 3] cycloaddition might involve two possible reaction pathways, including direct [3 + 3] cycloaddition of N-vinyl oxindole ntirones with oxyallyl cations, or the addition of TFE to N-vinyl oxindole nitrones, sequential addition to oxyallyl cations, elimination, and cyclization. The present method features mild reaction conditions, broad substrate scope, good functional group tolerance, easy gram scalable preparation, and new applications of TFE.
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Affiliation(s)
- Hao Yuan
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Collaborative Innovation Center for Guangxi Ethnic Medicine, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
| | - Yu-Zheng Wu
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Collaborative Innovation Center for Guangxi Ethnic Medicine, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
| | - Yu-Han Fang
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Collaborative Innovation Center for Guangxi Ethnic Medicine, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
| | - Chun-Hua Chen
- Key Laboratory of Chemistry and Engineering of Forest Products, State Ethnic Affairs Commision, Guangxi Key Laboratory of Chemistry and Engineering of Forest Products, Guangxi Collaborative Innovation Center for Chemistry and Engineering of Forest Products, School of Chemistry and Chemical Engineering, Guangxi Minzu University, Nanning 530008, China
| | - Cui Liang
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Collaborative Innovation Center for Guangxi Ethnic Medicine, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
| | - Dong-Liang Mo
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Collaborative Innovation Center for Guangxi Ethnic Medicine, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin 541004, China
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2
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Oliveira PHR, Tordato ÉA, Vélez JAC, Carneiro PS, Paixão MW. Visible-Light Mediated Carbamoylation of Nitrones under a Continuous Flow Regime. J Org Chem 2022; 88:6407-6419. [PMID: 36576774 DOI: 10.1021/acs.joc.2c02266] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Herein, we report a rapid and scalable continuous-flow photocatalytic approach for the carbamoylation of nitrones. This protocol makes use of readily available 4-amido-1,4 dihydropyridines as carbamoyl radical precursors. The scope of this transformation exhibits high compatibility with complex structures containing amino acids, peptides, and glycosides. Importantly, the developed method allows a photocatalytic synthetic strategy in combination with flow conditions, maximizing the potential and efficiency for the synthesis of valuable α-(N-hydroxy)amino amides.
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Affiliation(s)
- Pedro H R Oliveira
- Centre of Excellence for Research in Sustainable Chemistry (CERSusChem), Department of Chemistry, Federal University of São Carlos - UFSCar, São Carlos, São Paulo 13565-905, Brazil
| | - Éverton A Tordato
- Centre of Excellence for Research in Sustainable Chemistry (CERSusChem), Department of Chemistry, Federal University of São Carlos - UFSCar, São Carlos, São Paulo 13565-905, Brazil
| | - Jeimy A C Vélez
- Centre of Excellence for Research in Sustainable Chemistry (CERSusChem), Department of Chemistry, Federal University of São Carlos - UFSCar, São Carlos, São Paulo 13565-905, Brazil
| | - Pablo S Carneiro
- Centre of Excellence for Research in Sustainable Chemistry (CERSusChem), Department of Chemistry, Federal University of São Carlos - UFSCar, São Carlos, São Paulo 13565-905, Brazil
| | - Márcio W Paixão
- Centre of Excellence for Research in Sustainable Chemistry (CERSusChem), Department of Chemistry, Federal University of São Carlos - UFSCar, São Carlos, São Paulo 13565-905, Brazil
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3
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Li MF, Shi SQ, Xu T, Zhang Q, Hao WJ, Wang SL, Wang J, Tu SJ, Jiang B. Stereoselective construction of azepine-containing bridged scaffolds via organocata-lytic bicyclization of yne-allenone esters with nitrones. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.107751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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4
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Baidya M, Ghosh P, Mondal SL. Ascending of Cycloaddition Strategy for N–O Heterocycles. SYNTHESIS-STUTTGART 2022. [DOI: 10.1055/a-1703-6448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
AbstractThe N–O heterocycles are biologically relevant scaffolds and versatile building blocks in contemporary organic synthesis. In this short review, we showcase the involvement and elevation of various cycloaddition strategies towards the production of the N–O heterocycles; 1,2-oxazines and 1,2-oxazinanes, 1,2-oxazepanes, and 1,2-oxazetidines. An overview of the advantages and challenges associated with these synthetic endeavors is provided.1 Introduction2 Six-Membered N–O Heterocycles (1,2-Oxazines and 1,2-Oxazinanes)3 Seven-Membered N–O Heterocycles (1,2-Oxazepanes)4 Four-Membered N–O Heterocycles (1,2-Oxazetidines)5 Summary and Outlook
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5
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Kamal R, Omkar, Kumar V, Kumar R. Hydroxy(tosyloxy)iodobenzene (HTIB): A Convenient Oxidizing Agent for the Synthesis of Heterocycles. ChemistrySelect 2022. [DOI: 10.1002/slct.202103719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Raj Kamal
- Department of Chemistry Kurukshetra University, Kurukshetra- 136119 Haryana India
| | - Omkar
- Department of Chemistry Kurukshetra University, Kurukshetra- 136119 Haryana India
| | - Vipan Kumar
- Department of Chemistry Kurukshetra University, Kurukshetra- 136119 Haryana India
| | - Rajesh Kumar
- Department of Chemistry Mukand Lal National College Yamunanagar Haryana 135001 India
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6
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Masson G, Lyu J, Le T, Claraz A, Allain C, Audebert P. s-Tetrazine: Robust and Green Photoorganocatalyst for Aerobic Oxidation of N,N-Disubstituted Hydroxylamines to Nitrones. Synlett 2021. [DOI: 10.1055/a-1691-0449] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
AbstractEfficient photocatalytic aerobic oxidative dehydrogenation reactions of N,N-disubstituted hydroxylamines to nitrones were developed with an in situ generated photocatalyst based on commercially available 3,6-dichlorotetrazine. This process affords a wide range of nitrones in high yields under mild conditions. In addition, an oxidative (3+3) cycloaddition between an oxyallyl cation precursor and a hydroxylamine was also developed.
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7
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Liu Y, Peng X, She R, Zhou X, Peng Y. Catalytic Asymmetric (3 + 3) Cycloaddition of Oxyallyl Zwitterions with α-Diazomethylphosphonates. Org Lett 2021; 23:7295-7300. [PMID: 34494440 DOI: 10.1021/acs.orglett.1c02809] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The unique structure of oxyallyls represents a significant challenge for their catalytic asymmetric applications. Herein, an unprecedented chiral imidodiphosphoric acid-catalytic enantioselective (3 + 3) cycloaddition between oxyallyl zwitterions generated in situ from α-haloketones and α-diazomethylphosphonates was developed. Pharmaceutically interesting chiral pyridazine-4(1H)-ones were obtained in up to 98% yields with excellent stereoselectivities (up to 99% ee, > 99:1 dr).
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Affiliation(s)
- Yan Liu
- Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Xian Peng
- Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Rui She
- Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Xin Zhou
- Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Yungui Peng
- Key Laboratory of Applied Chemistry of Chongqing Municipality, School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
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8
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Xie YY, Wang YP, Zhao XJ, Wang AF, Chen ZM, Tu YQ. Oxyallyl cation promoted dearomative semipinacol rearrangement: a facile stereodivergent synthesis of spiro-indolines with contiguous quaternary centers. Chem Commun (Camb) 2021; 57:6632-6635. [PMID: 34124740 DOI: 10.1039/d1cc02033a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A novel oxyallyl cation promoted semipinacol rearrangement of indole-type allylic alcohols was disclosed for the stereodivergent synthesis of spiro-indolines. A variety of spiro-indolines were obtained with moderate to good yields. Three contiguous stereocenters, two of which are vicinal quaternary centers, were effectively formed with good diastereoselectivity. It is worth noting that two diastereoisomers of rearranged products can be readily achieved by easily regulating the reaction conditions. This method may provide an applicable approach for the synthesis of natural indole alkaloids.
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Affiliation(s)
- Yu-Yang Xie
- School of Chemistry and Chemical Engineering, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China.
| | - Yun-Peng Wang
- School of Chemistry and Chemical Engineering, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China.
| | - Xiao-Jing Zhao
- School of Chemistry and Chemical Engineering, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China.
| | - Ai-Fang Wang
- School of Chemistry and Chemical Engineering, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China.
| | - Zhi-Min Chen
- School of Chemistry and Chemical Engineering, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China.
| | - Yong-Qiang Tu
- School of Chemistry and Chemical Engineering, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, Frontiers Science Center for Transformative Molecules, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China. and State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, P. R. China.
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9
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Chada RR, Kajare RC, Bhandari MC, Mohammed SZ, Khatravath M, Warudikar K, Punna N. Facile access to [1,2]-oxazine derivatives via annulations of aminoxy-tethered 1,7-enynes. Org Biomol Chem 2021; 19:809-821. [PMID: 33403372 DOI: 10.1039/d0ob02279a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient approach for the highly diastereoselective construction of functionalized cyclopenta[d][1,2]oxazines via sequential oxyamination and Pauson-Khand reaction of readily accessible propargylic alcohols has been developed. Furthermore, the ring closing metathesis of these N-O linked 1,7-enynes afforded vinylated-[1,2]oxazines in good yields. The reduction of the N-O bond of the obtained cyclopenta[d][1,2]oxazine is accomplished to access cyclopentenone-based amino alcohols.
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Affiliation(s)
- Raji Reddy Chada
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad - 500007, India. and Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India
| | - Roshan Chandrakant Kajare
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad - 500007, India. and Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India
| | - Mayur C Bhandari
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India
| | - Siddique Z Mohammed
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad - 500007, India. and Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India
| | - Mahender Khatravath
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad - 500007, India.
| | - Kamalkishor Warudikar
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad - 500007, India. and Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India
| | - Nagender Punna
- Department of Organic Synthesis & Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad - 500007, India. and Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201 002, India
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10
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Liu Y, Liu J, Liu YY, Tang B, Lin H, Li Y, Zhang L. Synthesis of spirocyclic Δ 4-isoxazolines via [3 + 2] cycloaddition of indanone-derived ketonitrones with alkynes. RSC Adv 2021; 11:30415-30425. [PMID: 35480251 PMCID: PMC9041119 DOI: 10.1039/d1ra06063e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Accepted: 09/05/2021] [Indexed: 11/30/2022] Open
Abstract
A [3 + 2] cycloaddition of indanone-derived nitrones and alkynes under mild conditions is developed, allowing facile synthesis of spirocyclicindenyl isoxazolines with structural diversity. The sequential protocol of generated in situ ketonitrone from unsaturated ketones and N-alkylhydroxylamines is also achieved successfully, affording the desired products in considerable yield with moderate to good diastereoselectivity. Moreover, the spirocyclic product can be conveniently transformed into indenyl-based allylic alcohol and enamide. A [3 + 2] cycloaddition of indanone-derived nitrones with alkynes under mild conditions has been developed. It is a highly efficient and straightforward method for the synthesis of diverse spirocyclicindenyl isoxazolines.![]()
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Affiliation(s)
- Yilin Liu
- Hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol (PVA) Fiber Material, Institute of Organic Synthesis, Huaihua University, Huaihua 418000, China
- CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Jiaxue Liu
- Hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol (PVA) Fiber Material, Institute of Organic Synthesis, Huaihua University, Huaihua 418000, China
| | - Yan-Yun Liu
- Hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol (PVA) Fiber Material, Institute of Organic Synthesis, Huaihua University, Huaihua 418000, China
| | - Boxiao Tang
- Hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol (PVA) Fiber Material, Institute of Organic Synthesis, Huaihua University, Huaihua 418000, China
| | - Hongwei Lin
- Hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol (PVA) Fiber Material, Institute of Organic Synthesis, Huaihua University, Huaihua 418000, China
| | - Yuanxiang Li
- Hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol (PVA) Fiber Material, Institute of Organic Synthesis, Huaihua University, Huaihua 418000, China
| | - Lin Zhang
- Hunan Engineering Laboratory for Preparation Technology of Polyvinyl Alcohol (PVA) Fiber Material, Institute of Organic Synthesis, Huaihua University, Huaihua 418000, China
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11
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Mochimatsu T, Aota Y, Kano T, Maruoka K. CuCl
2
‐Mediated Oxidative Intramolecular α‐Arylation of Ketones with Phenolic Nucleophiles via Oxy‐Allyl Cation Intermediates. Chem Asian J 2020; 15:3816-3819. [DOI: 10.1002/asia.202001032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 10/01/2020] [Indexed: 12/12/2022]
Affiliation(s)
- Takuto Mochimatsu
- Department of Chemistry Graduate School of Science Kyoto University Sakyo, Kyoto 606-8502 Japan
| | - Yusuke Aota
- Department of Chemistry Graduate School of Science Kyoto University Sakyo, Kyoto 606-8502 Japan
| | - Taichi Kano
- Department of Chemistry Graduate School of Science Kyoto University Sakyo, Kyoto 606-8502 Japan
| | - Keiji Maruoka
- Department of Chemistry Graduate School of Science Kyoto University Sakyo, Kyoto 606-8502 Japan
- Graduate School of Pharmaceutical Sciences Kyoto University Sakyo, Kyoto 606-8501 Japan
- School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou 510006 P. R. China
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12
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Angyal A, Demjén A, Wölfling J, Puskás LG, Kanizsai I. Acid-Catalyzed 1,3-Dipolar Cycloaddition of 2 H-Azirines with Nitrones: An Unexpected Access to 1,2,4,5-Tetrasubstituted Imidazoles. J Org Chem 2020; 85:3587-3595. [PMID: 32020808 DOI: 10.1021/acs.joc.9b03288] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The first 1,3-dipolar cycloaddition of 2H-azirines with nitrones, a straightforward approach toward the regioselective synthesis of 1,2,4,5-tetrasubstituted imidazoles, is reported. This trifluoroacetic acid-catalyzed protocol tolerates a broad range of aliphatic and aromatic substrates, offering an efficient access to highly diverse, multisubstituted imidazoles in isolated yields up to 83% under mild conditions.
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Affiliation(s)
- Anikó Angyal
- AVIDIN Ltd., Alsó kikötő sor 11/D, Szeged H-6726, Hungary.,Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary
| | - András Demjén
- AVIDIN Ltd., Alsó kikötő sor 11/D, Szeged H-6726, Hungary
| | - János Wölfling
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary
| | | | - Iván Kanizsai
- AVIDIN Ltd., Alsó kikötő sor 11/D, Szeged H-6726, Hungary
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13
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Huang WH, Huang GB, Zhu WR, Weng J, Lu G. Transition metal-free synthesis of α-aryl ketones via oxyallyl cation capture with arylboronic acids. Org Chem Front 2020. [DOI: 10.1039/d0qo00447b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
α-Arylated ketones were accessed via oxyallyl cation capture with arylboronic acids in good yields with broad substrate tolerance.
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Affiliation(s)
- Wei-Hua Huang
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- P. R. China
| | - Gong-Bin Huang
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- P. R. China
| | - Wen-Run Zhu
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- P. R. China
| | - Jiang Weng
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- P. R. China
| | - Gui Lu
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery
- School of Pharmaceutical Sciences
- Sun Yat-sen University
- Guangzhou 510006
- P. R. China
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14
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Straightforward synthesis of 4,5-bifunctionalized 1,2-oxazinanes via Lewis acid promoted regio- and stereo-selective nucleophilic ring-opening of 3,6-dihydro-1,2-oxazine oxides. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.05.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Nguyen TN, Setthakarn K, May JA. Oxyallyl Cation Capture via Electrophilic Deborylation of Organoboronates: Access to α, α'-Substituted Cyclic Ketones. Org Lett 2019; 21:7837-7840. [PMID: 31536365 DOI: 10.1021/acs.orglett.9b02831] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
An umpolung strategy to synthesize α,α'-substituted cyclic ketones through the nucleophilic addition of organoboronates to α-hydroxyl silyl enol ethers is described. The reaction proceeds via the trapping of in situ generated oxyallyl cations via the electrophilic deborylation of C(sp2) and C(sp) borates. This efficient and straightforward method provides direct access to α-substituted silyl enol ethers in high yield with complete regioselectivity. Desilylation in a one-pot procedure provides the corresponding α,α'-disubstituted ketones with high diastereoselectivity.
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Affiliation(s)
- Truong N Nguyen
- Department of Chemistry , University of Houston , 3585 Cullen Boulevard, Fleming Building Room 112 , Houston , Texas 77204-5003 , United States
| | - Krit Setthakarn
- Department of Chemistry , University of Houston , 3585 Cullen Boulevard, Fleming Building Room 112 , Houston , Texas 77204-5003 , United States
| | - Jeremy A May
- Department of Chemistry , University of Houston , 3585 Cullen Boulevard, Fleming Building Room 112 , Houston , Texas 77204-5003 , United States
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16
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Sun L, Liu Y, Wang Y, Li Y, Liu Z, Lu T, Li W. An efficient synthesis of oxazolines via a cascade reaction between azaoxyallyl cations and 1,2-benzisoxazoles. Org Biomol Chem 2019; 17:7526-7530. [PMID: 31368471 DOI: 10.1039/c9ob01366k] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A formal [3 + 2] cycloaddition reaction between the C and O terminals of azaoxyallyl cations formed in situ and 1,2-benzisoxazoles has been realized. This one-pot cycloaddition method provided an effective and practical pathway to synthesize oxazoline in good yields under mild conditions. The title products exhibited unique fluorescence properties.
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Affiliation(s)
- Li Sun
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing, 210009, P. R. China.
| | - Yi Liu
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing, 210009, P. R. China.
| | - Yankai Wang
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing, 210009, P. R. China.
| | - Yuanyuan Li
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing, 210009, P. R. China.
| | - Zhiwen Liu
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing, 210009, P. R. China.
| | - Tao Lu
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing, 210009, P. R. China.
| | - Wenhai Li
- State Key Laboratory of Natural Medicines, Department of Organic Chemistry, China Pharmaceutical University, Nanjing, 210009, P. R. China.
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17
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Sahani RL, Liu RS. Gold-Catalyzed Oxidative Arylations of 3-Butyn-1-ols and 2-Propyn-1-ols with Nitrones to Yield Distinct Fused Indoles Bearing a Heterocyclic Ring. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01491] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Rajkumar Lalji Sahani
- Frontier Research Center on Fundamental and Applied Science of Matters, Department of Chemistry, National Tsing-Hua University, No. 101, Section 2, Kuang-Fu Road, Hsinchu-30013, Taiwan, ROC
| | - Rai-Shung Liu
- Frontier Research Center on Fundamental and Applied Science of Matters, Department of Chemistry, National Tsing-Hua University, No. 101, Section 2, Kuang-Fu Road, Hsinchu-30013, Taiwan, ROC
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18
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Ni Y, Zuo H, Yu H, Wu Y, Zhong F. Synergistic Catalysis-Enabled Thia-Aza-Prins Cyclization with DMSO and Disulfides: Entry to Sulfenylated 1,3-Oxazinanes and Oxazolidines. Org Lett 2018; 20:5899-5904. [DOI: 10.1021/acs.orglett.8b02551] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Yang Ni
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan 430074, China
| | - Honghua Zuo
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan 430074, China
| | - Huaibin Yu
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan 430074, China
| | - Yuzhou Wu
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan 430074, China
| | - Fangrui Zhong
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan 430074, China
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19
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Hu L, Rombola M, Rawal VH. Synthesis of 1,2-Oxazinanes via Hydrogen Bond Mediated [3 + 3] Cycloaddition Reactions of Oxyallyl Cations with Nitrones. Org Lett 2018; 20:5384-5388. [PMID: 30133293 DOI: 10.1021/acs.orglett.8b02301] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Reported herein is the development of [3 + 3] cycloaddition reactions between oxyallyl cations and nitrones to yield 1,2-oxazinane heterocycles. Oxyallyl cation intermediates, generated in situ from α-tosyloxy ketones in the presence of hexafluoro-2-propanol (HFIP), a cosolvent, and a base, are found to react with a range of nitrones to afford 1,2-oxazinanes in good to high yields. The reactions are catalyzed by hydrogen-bond donors such as phenols and squaramides, and dramatically higher diastereoselectivities are observed with 4-nitrophenol.
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Affiliation(s)
- Lingbowei Hu
- Department of Chemistry , University of Chicago , 5735 South Ellis Avenue , Chicago , Illinois 60637 , United States
| | - Michael Rombola
- Department of Chemistry , University of Chicago , 5735 South Ellis Avenue , Chicago , Illinois 60637 , United States
| | - Viresh H Rawal
- Department of Chemistry , University of Chicago , 5735 South Ellis Avenue , Chicago , Illinois 60637 , United States
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20
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Singh R, Nagesh K, Yugandhar D, Prasanthi AVG. Metal- and Oxidant-Free Modular Approach To Access N-Alkoxy Oxindoles via Aryne Annulation. Org Lett 2018; 20:4848-4853. [PMID: 30044101 DOI: 10.1021/acs.orglett.8b01972] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
An unprecedented metal- and oxidant-free (intermolecular) approach to access N-alkoxy oxindoles via [3 + 2] cycloadition of in situ generated electrophilic species viz. aryne and (putative) aza-oxyallyl cation is reported. This approach is amenable to both C3-unsubstituted as well as C3-substituted oxindoles. A one-pot manipulation further makes this reaction highly practical. The versatility of this approach was demonstrated through valuable synthetic transformations.
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Affiliation(s)
- Ritesh Singh
- Department of Medicinal Chemistry , National Institute of Pharmaceutical Education and Research (NIPER) , Raebareli - 229010 , UP , India.,Organic Synthesis and Process Chemistry Division , CSIR-Indian Institute of Chemical Technology , Hyderabad - 500007 , Telangana , India
| | - Kommu Nagesh
- Organic Synthesis and Process Chemistry Division , CSIR-Indian Institute of Chemical Technology , Hyderabad - 500007 , Telangana , India
| | - Doddapaneni Yugandhar
- Organic Synthesis and Process Chemistry Division , CSIR-Indian Institute of Chemical Technology , Hyderabad - 500007 , Telangana , India
| | - A V G Prasanthi
- Organic Synthesis and Process Chemistry Division , CSIR-Indian Institute of Chemical Technology , Hyderabad - 500007 , Telangana , India
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