1
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Yue XJ, Pei LP, Wang MC, Jia SK, Mei GJ. Synthesis of 3-indolyl all-carbon quaternary centers via Rh/Brønsted acid co-catalyzed three-component reactions of azoalkenes with indoles and diazoacetates. Org Biomol Chem 2025. [PMID: 40365940 DOI: 10.1039/d5ob00567a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/15/2025]
Abstract
Highly diastereoselective three-component reactions of azoalkenes with indoles and diazoacetates have been developed via a Rh/Brønsted acid co-catalyzed strategy. These transformations provide efficient construction of a range of 3-indolyl all-carbon quaternary centers in good yields and diastereoselectivities. This reaction is proposed to proceed through Michael-type trapping of zwitterionic intermediates generated from metal carbenes and indoles.
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Affiliation(s)
- Xiao-Jing Yue
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
| | - Li-Ping Pei
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
| | - Min-Can Wang
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
| | - Shi-Kun Jia
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
| | - Guang-Jian Mei
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
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2
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Li JC, Li JW, Zhang R, Dong D. Highly Stereoselective Synthesis of α-Oxoketene N,X-Acetals ( X = O, S, or N) under Mild Conditions. Org Lett 2025; 27:1906-1911. [PMID: 39960992 DOI: 10.1021/acs.orglett.5c00174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2025]
Abstract
A straightforward synthesis of α-oxoketene N,X-acetals (X = O, S, or N) from β-oxoamides has been described. The oxyphosphonium intermediates are quickly generated in situ from β-oxoamides in the presence of Hendrickson reagent and triflic anhydride (Tf2O) in a chemoselective manner and undergo a chemoselective nucleophilic substitution with phenols, thiophenols, or aromatic amines to deliver the desired products with high stereoselectivity. The one-pot synthetic protocol features readily available starting materials, mild conditions, simple execution, and a wide range of synthetic potentials of the products.
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Affiliation(s)
- Jia-Cheng Li
- Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
- University of Science and Technology of China, Hefei 230026, P. R. China
| | - Jia-Wang Li
- Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
- University of Science and Technology of China, Hefei 230026, P. R. China
| | - Rui Zhang
- Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
| | - Dewen Dong
- Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P. R. China
- University of Science and Technology of China, Hefei 230026, P. R. China
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3
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Ma JB, Zhao QS, Yin YM, Yang S, Shao JQ, Yan SJ. Cascade [3 + 2]/[4 + 2] Cycloaddition of Enaminones with Vinylene Carbonate for the Synthesis of Functionalized Pyrrolo[2,1- a]isoquinoline Derivatives. Org Lett 2024; 26:9752-9758. [PMID: 39504005 DOI: 10.1021/acs.orglett.4c03638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2024]
Abstract
We developed a protocol for the synthesis of functionalized pyrrolo[2,1-a]isoquinoline derivatives (PIQDs) 3 from enaminones 1 using vinylene carbonate 2. This strategy involved [3 + 2] and [4 + 2] cycloadditions via heating a mixture of substrates 1 with vinylene carbonate 2 and DCE at 60 °C, catalyzed by [Cp*RhCl2]2 and oxidized with Cu(OAc)2 and AgSbF6 promoted by NaOAc. As we increased the reaction temperature to 110 °C under the same conditions, we synthesized PIQDs 4 through sequential C-H activation, alkene insertion, migratory insertion, C-N reductive elimination, β-O elimination, and finally dehydration. As a result, a series of PIQDs 3-4 were generated by forming four bonds (2 C-C and 2 C-N bonds) in a single step. This strategy realizes the synthesis of linear molecules with potential biological activity, specifically natural-like heterocycles (3-4). It expands the application of vinylene carbonate as a C2 synthon in the construction of pyrrole and isoquinoline skeletons for the synthesis of functionalized PIQDs in combinatorial and parallel syntheses via one-pot reactions.
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Affiliation(s)
- Jian-Bo Ma
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China
| | - Qing-Sheng Zhao
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China
| | - Yi-Mai Yin
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China
| | - Shu Yang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China
| | - Jia-Qi Shao
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China
| | - Sheng-Jiao Yan
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China
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4
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Yang S, Guo TT, Ma JB, Jia HT, Liu J, Yan SJ. Radical Cascade Reaction of Heterocyclic Ketene Aminals with Thiocyanates Promoted by Visible Light: Synthesis of Functionalized Fused 2-Iminothiazolines. J Org Chem 2024; 89:13678-13690. [PMID: 39240699 DOI: 10.1021/acs.joc.4c01899] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/08/2024]
Abstract
Herein, a visible-light-promoted radical cascade cyclization of heterocyclic ketene aminals (HKAs) and thiocyanates was developed to access functionalized fused 2-iminothiazolines. This novel cascade reaction can be realized under only visible-light irradiation without the help of external photocatalysts, oxidants, and additives. These multicomponent cascade reactions demonstrate excellent selectivity for the Z-isomers and ensure the formation of the products only in their isomeric form. Preliminary mechanism investigations demonstrated that HKAs and thiocyanates can form electron donor-acceptor complexes for harvesting the energy of visible light to activate substrates and generate reactive radicals. This protocol can be used for synthesizing various natural-like products such as fused 2-iminothiazolines. This approach demonstrates multiple advantages such as commercially available substrates, convenient operation, environmentally friendly, mild conditions, and an efficient multicomponent reaction (2A + B).
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Affiliation(s)
- Shu Yang
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University), Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, P. R. China
| | - Ting-Ting Guo
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University), Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, P. R. China
| | - Jian-Bo Ma
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University), Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, P. R. China
| | - Hui-Ting Jia
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University), Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, P. R. China
| | - Jin Liu
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University), Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, P. R. China
| | - Sheng-Jiao Yan
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University), Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, P. R. China
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5
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Hu XM, Huang R, Wen QL, Duan YG, Cao XL, Yan SJ. Hydroxyl-Directed Rh(III)-Catalyzed C-H Functionalization: Access to Benzo[ de]chromenes. Org Lett 2023; 25:1622-1627. [PMID: 36867606 DOI: 10.1021/acs.orglett.3c00095] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
Abstract
A cascade oxidative annulation reaction of heterocyclic ketene aminals (HKAs) with internal alkynes catalyzed by [Cp*RhCl2]2 and oxidized by Cu(OAc)2·H2O was developed to efficiently synthesize highly functionalized benzo[de]chromene derivatives in good to excellent yields. The reaction proceeded by the sequential cleavage of C(sp2)-H/O-H and C(sp2)-H/C(sp2)-H bonds. These multicomponent cascade reactions were highly regioselective. In addition, all of the benzo[de]chromene products exhibited intense fluorescence emission in the solid state, and they demonstrated concentration-dependent quenching in the presence of Fe3+, indicating that these compounds could be used in the recognition of Fe3+.
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Affiliation(s)
- Xing-Mei Hu
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, P. R. China
| | - Rong Huang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, P. R. China
| | - Qiu-Lin Wen
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, P. R. China
| | - Ying-Gang Duan
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, P. R. China
| | - Xin-Ling Cao
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, P. R. China
| | - Sheng-Jiao Yan
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming 650091, P. R. China
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Yang FY, Han TJ, Jia SK, Wang MC, Mei GJ. Catalytic [2,3]-sigmatropic rearrangement of sulfonium ylides derived from azoalkenes: non-carbenoid Doyle-Kirmse reaction. Chem Commun (Camb) 2023; 59:3107-3110. [PMID: 36808428 DOI: 10.1039/d3cc00160a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
The Sc(III)-catalyzed [2,3]-sigmatropic rearrangement of sulfonium ylides derived from azoalkenes has been established. Owing to the absence of a carbenoid intermediate, this protocol represents the first non-carbenoid variant of the Doyle-Kirmse reaction. Under mild conditions, a variety of tertiary thioethers have been readily prepared in good to excellent yields.
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Affiliation(s)
- Fu-Yuan Yang
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
| | - Tian-Jiao Han
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
| | - Shi-Kun Jia
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
| | - Min-Can Wang
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
| | - Guang-Jian Mei
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou 450001, China.
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Li K, Lv Y, Lu Z, Yun X, Yan S. An environmentally benign multi-component reaction: Highly regioselective synthesis of functionalized 2-(diarylphosphoryl)-1,2-dihydro-pyridine derivatives. GREEN SYNTHESIS AND CATALYSIS 2021. [DOI: 10.1016/j.gresc.2021.10.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
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8
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Duan YG, Hu XM, Cao XL, Lv KH, Yan SJ. Multicomponent Cascade Reaction of 3-Formylchromones: Highly Selective Synthesis of Functionalized 9-Azabicyclo[3.3.1]nonane Derivatives. Org Lett 2021; 23:6866-6871. [PMID: 34410137 DOI: 10.1021/acs.orglett.1c02431] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A novel protocol for the preparation of functionalized 9-azabicyclo[3.3.1]nonane (ABCN) derivatives from 3-formylchromones, enaminones, and heterocyclic ketene aminals (HKAs) through an unprecedented cascade reaction has been developed by simply refluxing the mixture of the substrates 1-3. As a result, a series of ABCNs were produced through a very complex cascade reaction. This protocol can be used in the synthesis of ABCNs that are suitable for combinatorial and parallel syntheses of ABCN natural-like products in a one-pot reaction.
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Affiliation(s)
- Ying-Gang Duan
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China
| | - Xing-Mei Hu
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China
| | - Xin-Ling Cao
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China
| | - Kai-Hong Lv
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China
| | - Sheng-Jiao Yan
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, 650091, P. R. China
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9
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Ying Z, Cen J, Luo F, Wu Y, Liu S, Chen W, Shao J, Yu Y. Substrate-Tuned Domino Annulation for Selective Synthesis of Poly-substituted Benzo[ f]imidazo[2,1- a][2,7]naphthyridines and 3-Azaheterocyclic Substituted 2-Arylquinolines. J Org Chem 2021; 86:4747-4755. [PMID: 33629853 DOI: 10.1021/acs.joc.1c00112] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A domino annulation/oxidation of heterocyclic ketene aminals (HKAs) and 2-aminochalcones has been developed for the selective synthesis of poly-substituted benzo[f]imidazo[2,1-a][2,7]naphthyridines and 3-azaheterocyclic substituted 2-arylquinolines. These reactions proceed well under mild conditions without any additives. Plausible mechanisms for such a polycyclic ring system assembly were also proposed. Moreover, benzo[f]imidazo[2,1-a][2,7]naphthyridine 3g displayed a fluorescence effect, demonstrating the potential applications in organic optical materials.
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Affiliation(s)
- Zhimin Ying
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, People's Republic of China, 310058
| | - Jie Cen
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, People's Republic of China, 310058
| | - Feng Luo
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, People's Republic of China, 310058
| | - You Wu
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, People's Republic of China, 310058
| | - Shuangrong Liu
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, People's Republic of China, 310058
| | - Wenteng Chen
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, People's Republic of China, 310058
| | - Jiaan Shao
- School of Medicine, Zhejiang University City College, Hangzhou, People's Republic of China, 310015
| | - Yongping Yu
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou, People's Republic of China, 310058
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10
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Li K, Huang R, Chen L, Lv Y, Yan SJ. Cu(II)/Iodine(III) Oxide Dimerization of Heterocyclic Ketene Aminals: Tandem TEMPO Oxidation for the Highly Selective Synthesis of Functionalized 2H-Pyrrolo[1,2-a]imidazol-7(3H)-ones. Org Lett 2020; 22:8210-8214. [DOI: 10.1021/acs.orglett.0c02689] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Kun Li
- Key Laboratory of Medicinal Chemistry for Natural Resources, Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
| | - Rong Huang
- Key Laboratory of Medicinal Chemistry for Natural Resources, Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
| | - Li Chen
- Key Laboratory of Medicinal Chemistry for Natural Resources, Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
| | - Ying Lv
- Key Laboratory of Medicinal Chemistry for Natural Resources, Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
| | - Sheng-Jiao Yan
- Key Laboratory of Medicinal Chemistry for Natural Resources, Ministry of Education and Yunnan Province, School of Chemical Science and Technology, Yunnan University, Kunming 650091, China
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11
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Zhang CH, Huang R, Qing X, Lin J, Yan SJ. Cascade reaction of isatins with nitro-substituted enamines: highly selective synthesis of functionalized (Z)-3-(1-(arylamino)-2-oxoarylidene)indolin-2-ones. Chem Commun (Camb) 2020; 56:3488-3491. [DOI: 10.1039/d0cc00923g] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A novel protocol for the construction of functionalized (Z)-3-(1(-arylamino)-2-oxoarylidene)indolin-2-ones (AOIDOs) from isatins 1 with nitro-substituted enamines 2via an unprecedented cascade reaction catalyzed by sulfamic acid is developed.
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Affiliation(s)
- Cong-Hai Zhang
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University)
- Ministry of Education and Yunnan Province
- School of Chemical Science and Technology
- Yunnan University
- Kunming
| | - Rong Huang
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University)
- Ministry of Education and Yunnan Province
- School of Chemical Science and Technology
- Yunnan University
- Kunming
| | - Xia Qing
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University)
- Ministry of Education and Yunnan Province
- School of Chemical Science and Technology
- Yunnan University
- Kunming
| | - Jun Lin
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University)
- Ministry of Education and Yunnan Province
- School of Chemical Science and Technology
- Yunnan University
- Kunming
| | - Sheng-Jiao Yan
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University)
- Ministry of Education and Yunnan Province
- School of Chemical Science and Technology
- Yunnan University
- Kunming
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Luo K, Li W, Lin J, Jin Y. Tandem reaction of heterocyclic ketene aminals with diazoesters: Synthesis of pyrimidopyrrolidone derivatives. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.151136] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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13
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Wang L, Qi C, Guo T, Jiang H. Direct Access to α-Oxoketene Aminals via Copper-Catalyzed Formal Oxyaminalization of Alkenes under Mild Conditions. Org Lett 2019; 21:2223-2226. [DOI: 10.1021/acs.orglett.9b00518] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lu Wang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P.R. China
| | - Chaorong Qi
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P.R. China
- State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, P.R. China
| | - Tianzuo Guo
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P.R. China
| | - Huanfeng Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P.R. China
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