1
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Lee WCC, Wang J, Zhu Y, Zhang XP. Asymmetric Radical Bicyclization for Stereoselective Construction of Tricyclic Chromanones and Chromanes with Fused Cyclopropanes. J Am Chem Soc 2023; 145:11622-11632. [PMID: 37129381 PMCID: PMC10249947 DOI: 10.1021/jacs.3c01618] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Asymmetric radical bicyclization processes have been developed via metalloradical catalysis (MRC) to stereoselectively construct chiral chromanones and chromanes bearing fused cyclopropanes. Through optimization of a versatile D2-symmetric chiral amidoporphyrin ligand platform, a Co(II)-metalloradical system can homolytically activate both diazomalonates and α-aryldiazomethanes containing different alkene functionalities under mild conditions for effective radical bicyclization, delivering cyclopropane-fused tricyclic chromanones and chromanes, respectively, in high yields with excellent control of both diastereoselectivities and enantioselectivities. Combined computational and experimental studies, including the electron paramagnetic resonance (EPR) detection and 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO) trapping of key radical intermediates, shed light on the working details of the underlying stepwise radical mechanisms of the Co(II)-catalyzed bicyclization processes. The two catalytic radical processes provide effective synthetic tools for stereoselective construction of valuable cyclopropane-fused chromanones and chromanes with newly generated contiguous stereogenic centers. As a specific demonstration of synthetic application, the Co(II)-catalyzed radical bicyclization has been employed as a key step for the first asymmetric total synthesis of the natural product (+)-Radulanin J.
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Affiliation(s)
- Wan-Chen Cindy Lee
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Jingyi Wang
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Yiling Zhu
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - X Peter Zhang
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
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2
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Jen H, Yoo EJ. Cascade cycloadditions of
N‐aromatic
zwitterions and allylic sulfonium ylides: Dual roles of the allylic sulfonium ylide in the cascade reaction. B KOREAN CHEM SOC 2022. [DOI: 10.1002/bkcs.12648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Hyundug Jen
- Department of Applied Chemistry Kyung Hee University Yongin Republic of Korea
| | - Eun Jeong Yoo
- Department of Applied Chemistry Kyung Hee University Yongin Republic of Korea
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3
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Hua TB, Ma YH, He XY, Wang L, Yan JY, Yang QQ. A formal [4 + 1] cycloaddition reaction of Baylis–Hillman bromides with sulfur ylides: facile access to α-alkenyl lactones. Org Chem Front 2022. [DOI: 10.1039/d2qo00451h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A formal [4 + 1] cycloaddition reaction of Baylis–Hillman adducts with sulfur ylides has been developed for the first time.
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Affiliation(s)
- Ting-Bi Hua
- College of Materials and Chemical Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, 8 Daxue Road, Yichang, Hubei 443002, China
| | - Yu-Hong Ma
- College of Materials and Chemical Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, 8 Daxue Road, Yichang, Hubei 443002, China
| | - Xiao-Yu He
- College of Materials and Chemical Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, 8 Daxue Road, Yichang, Hubei 443002, China
| | - Long Wang
- College of Materials and Chemical Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, 8 Daxue Road, Yichang, Hubei 443002, China
- Hubei Three Gorges Laboratory, Yichang, Hubei 443007, China
| | - Jia-Ying Yan
- College of Materials and Chemical Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, 8 Daxue Road, Yichang, Hubei 443002, China
- Hubei Three Gorges Laboratory, Yichang, Hubei 443007, China
| | - Qing-Qing Yang
- College of Materials and Chemical Engineering, Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials, China Three Gorges University, 8 Daxue Road, Yichang, Hubei 443002, China
- Hubei Three Gorges Laboratory, Yichang, Hubei 443007, China
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4
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Ushakov P, Ioffe S, Sukhorukov AY. Recent advances in the application of ylide-like species in [4+1]-annulation reactions: an update review. Org Chem Front 2022. [DOI: 10.1039/d2qo00698g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this review, advances in [4+1]‐annulation reactions involving sulfonium, sulfoxonium and ammonium ylides, as well as diazo compounds and carbenes are summarized over the last 6 years. Newly emerged methods...
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5
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Dai Y, Di J, Hao Z, Meng X, Zhang L. Synthesis of Spiro[benzo[
b
]thiophene‐2(3
H
),1′‐cyclopropan]‐3‐ones via Domino Reaction Between Thioaurones and Sulfur Ylides. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Yayue Dai
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion Tianjin Key Laboratory of Drug Targeting and Bioimaging School of Chemistry & Chemical Engineering Tianjin University of Technology Tianjin 300384 P. R. China
| | - Jianhao Di
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion Tianjin Key Laboratory of Drug Targeting and Bioimaging School of Chemistry & Chemical Engineering Tianjin University of Technology Tianjin 300384 P. R. China
| | - Zeyang Hao
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion Tianjin Key Laboratory of Drug Targeting and Bioimaging School of Chemistry & Chemical Engineering Tianjin University of Technology Tianjin 300384 P. R. China
| | - Xiangtai Meng
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion Tianjin Key Laboratory of Drug Targeting and Bioimaging School of Chemistry & Chemical Engineering Tianjin University of Technology Tianjin 300384 P. R. China
| | - Lei Zhang
- Tianjin Engineering Technology Center of Chemical Wastewater Source Reduction and Recycling School of Science Tianjin Chengjian University Tianjin 300384 P. R. China
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6
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Yuan WC, Lei CW, Zhao JQ, Wang ZH, You Y. Organocatalytic Asymmetric Cyclopropanation of 3-Acylcoumarins with 3-Halooxindoles: Access to Spirooxindole-cyclopropa[ c]coumarin Compounds. J Org Chem 2021; 86:2534-2544. [PMID: 33423494 DOI: 10.1021/acs.joc.0c02653] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
A highly diastereo- and enantioselective cyclopropanation reaction of 3-acylcoumarins with 3-halooxindoles catalyzed by an organocatalyst through a [2 + 1] Michael/intramolecular cyclization process was developed. This scenario provides a facile strategy to access spirooxindole-cyclopropa[c]coumarin compounds bearing three continuous stereocenters, including two vicinal quaternary all-carbon stereocenters with high to excellent diastereo- and enantioselectivities. The HRMS study revealed the vital importance of the ammonium ylide intermediate in the catalytic process.
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Affiliation(s)
- Wei-Cheng Yuan
- Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Chuan-Wen Lei
- School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang, 550025, China
| | - Jian-Qiang Zhao
- Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Zhen-Hua Wang
- Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Yong You
- Institute for Advanced Study, Chengdu University, Chengdu 610106, China
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7
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Qiu Y, Lu K, Wei B, Qian Z, He Z. P III-Mediated Intramolecular Cyclopropanation and Synthesis of Cyclopropa[ c]coumarins. CHINESE J ORG CHEM 2021. [DOI: 10.6023/cjoc202104036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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8
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Fu J, Tsapy Takia IR, Chen P, Liu W, Jiang C, Yao W, Zeng X, Wang Y, Han X. Synthesis of 2-chromanone-fused [3.2.0] bicycles through a phosphine-mediated tandem [3 + 2] cyclization/intramolecular Wittig reaction. Org Chem Front 2021. [DOI: 10.1039/d1qo01013a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A phosphine-mediated tandem [3 + 2] cyclization/intramolecular Wittig reaction of alkynone is described. 2-Chromanone-fused bicyclo[3.2.0]heptenones were synthesized in moderate to high yields with remarkably high regio- and diastereoselectivities.
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Affiliation(s)
- Junfeng Fu
- School of Biological and Chemical Engineering, Zhejiang University of Science & Technology, Liuhe Road 318, Hangzhou, 310023, P. R. China
| | - Ingrid Rakielle Tsapy Takia
- School of Biological and Chemical Engineering, Zhejiang University of Science & Technology, Liuhe Road 318, Hangzhou, 310023, P. R. China
| | - Peng Chen
- School of Biological and Chemical Engineering, Zhejiang University of Science & Technology, Liuhe Road 318, Hangzhou, 310023, P. R. China
| | - Wei Liu
- School of Biological and Chemical Engineering, Zhejiang University of Science & Technology, Liuhe Road 318, Hangzhou, 310023, P. R. China
| | - Chengjun Jiang
- School of Biological and Chemical Engineering, Zhejiang University of Science & Technology, Liuhe Road 318, Hangzhou, 310023, P. R. China
| | - Weijun Yao
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou, 310018, P. R. China
| | - Xiaofei Zeng
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou, 311121, P. R. China
| | - Yongjiang Wang
- School of Biological and Chemical Engineering, Zhejiang University of Science & Technology, Liuhe Road 318, Hangzhou, 310023, P. R. China
| | - Xiaoyu Han
- School of Biological and Chemical Engineering, Zhejiang University of Science & Technology, Liuhe Road 318, Hangzhou, 310023, P. R. China
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9
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Sun JC, Wang XH, Ji CB, Peng YY, Zeng XP. Enantioselective Construction of Chiral Cyclopropa[ c]coumarins via Lewis Base-Catalyzed Cyclopropanation. J Org Chem 2020; 85:14963-14970. [PMID: 33136397 DOI: 10.1021/acs.joc.0c01782] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The first highly enantioselective construction of chiral cyclopropa[c]coumarins was described. Using commercially available (bis)cinchona alkaloid (DHQ)2PYR as the chiral Lewis base catalyst, together with Cs2CO3 as the achiral base, the reaction of a series of coumarin-3-carboxylate and 3-benzoyl coumarins with tert-butyl 2-bromoacetate could give rise to the corresponding cyclopropa[c]coumarins bearing three continuous chiral stereocenters in 83-93% ee and 90-97% ee, respectively. The reaction is proposed to proceed via an in situ generated ammonium ylide intermediate.
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Affiliation(s)
- Jun-Chao Sun
- Key Laboratory of Small Functional Organic Molecule, Ministry of Education and Jiangxi Key Laboratory of Green Chemistry, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
| | - Xiao-Hui Wang
- Key Laboratory of Small Functional Organic Molecule, Ministry of Education and Jiangxi Key Laboratory of Green Chemistry, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
| | - Cong-Bin Ji
- Jiangxi Provincial Research of Targeting Pharmaceutical Engineering Technology, Shangrao Normal University, Shangrao, Jiangxi 334001, China
| | - Yi-Yuan Peng
- Key Laboratory of Small Functional Organic Molecule, Ministry of Education and Jiangxi Key Laboratory of Green Chemistry, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
| | - Xing-Ping Zeng
- Key Laboratory of Small Functional Organic Molecule, Ministry of Education and Jiangxi Key Laboratory of Green Chemistry, Jiangxi Normal University, Nanchang, Jiangxi 330022, China
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10
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Hasegawa M, Suga T, Soeta T, Ukaji Y. Synthesis of 3,6-Dihydro-2 H-1,2-oxazines via Dimethylsulfoxonium Methylide Addition to α,β-Unsaturated Nitrones. J Org Chem 2020; 85:11258-11264. [PMID: 32786638 DOI: 10.1021/acs.joc.0c01349] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A unique and efficient formation of 3,6-dihydro-2H-1,2-oxazines starting from α,β-unsaturated nitrones has been achieved. The nucleophilic addition of dimethylsulfoxonium methylide to the C═N bond of an α,β-unsaturated nitrone to form an aziridine N-oxide followed by the Meisenheimer rearrangement affords 3,6-dihydro-2H-1,2-oxazine in up to 70% yield. Methylene was confirmed to be incorporated at the C3 position of the ring. A wide range of β-aryl-substituted α,β-unsaturated nitrones were applicable to this reaction.
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Affiliation(s)
- Megumi Hasegawa
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
| | - Takuya Suga
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
| | - Takahiro Soeta
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
| | - Yutaka Ukaji
- Division of Material Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa, Ishikawa 920-1192, Japan
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11
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Sun JC, Li JL, Ji CB, Peng YY, Zeng XP. Construction of Cyclopropa[c]coumarins via cascade Michael-alkylation process of 3-cyanocoumarin with 2-bromomalonate. Tetrahedron 2020. [DOI: 10.1016/j.tet.2019.130852] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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12
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Abstract
Cyclopropanes, one of the most important strained rings, have gained much attention for more than a century because of their interesting and unique reactivity. They not only exist in many natural products, but have also been widely used in the fields of organic synthesis, medicinal chemistry and materials science as versatile building blocks. Based on the sustainable development in this area, this review mainly focuses on the recent advances in the synthesis of cyclopropanes classified by the type of catalytic system, including regio-, diastereo-, and enantio-selective reactions.
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Affiliation(s)
- Wanqing Wu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, Guangdong Engineering Research Center for Green Fine Chemicals, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China.
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13
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Kang JW, Li X, Chen FY, Luo Y, Zhang SC, Kang B, Peng C, Tian X, Han B. Protecting group-directed annulations of tetra-substituted oxindole olefins and sulfur ylides: regio- and chemoselective synthesis of cyclopropane- and dihydrofuran-fused spirooxindoles. RSC Adv 2019; 9:12255-12264. [PMID: 35515867 PMCID: PMC9063500 DOI: 10.1039/c9ra02192b] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Accepted: 04/10/2019] [Indexed: 12/21/2022] Open
Abstract
Protecting group-controlled regio- and chemoselective synthesis of cyclopropane- and dihydrofuran-fused spirooxindoles containing vicinal quaternary carbon centers.
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Affiliation(s)
- Jing-Wen Kang
- State Key Laboratory Breeding Base of Systematic Research Development and Utilization of Chinese Medicine Resources School of Pharmacy
- Chengdu University of Traditional Chinese Medicine
- Chengdu 611137
- P. R. China
| | - Xiang Li
- State Key Laboratory Breeding Base of Systematic Research Development and Utilization of Chinese Medicine Resources School of Pharmacy
- Chengdu University of Traditional Chinese Medicine
- Chengdu 611137
- P. R. China
| | - Fei-Yu Chen
- State Key Laboratory Breeding Base of Systematic Research Development and Utilization of Chinese Medicine Resources School of Pharmacy
- Chengdu University of Traditional Chinese Medicine
- Chengdu 611137
- P. R. China
| | - Yuan Luo
- State Key Laboratory Breeding Base of Systematic Research Development and Utilization of Chinese Medicine Resources School of Pharmacy
- Chengdu University of Traditional Chinese Medicine
- Chengdu 611137
- P. R. China
| | - Shu-Cang Zhang
- State Key Laboratory Breeding Base of Systematic Research Development and Utilization of Chinese Medicine Resources School of Pharmacy
- Chengdu University of Traditional Chinese Medicine
- Chengdu 611137
- P. R. China
| | - Bin Kang
- State Key Laboratory Breeding Base of Systematic Research Development and Utilization of Chinese Medicine Resources School of Pharmacy
- Chengdu University of Traditional Chinese Medicine
- Chengdu 611137
- P. R. China
| | - Cheng Peng
- State Key Laboratory Breeding Base of Systematic Research Development and Utilization of Chinese Medicine Resources School of Pharmacy
- Chengdu University of Traditional Chinese Medicine
- Chengdu 611137
- P. R. China
| | - Xu Tian
- Key Laboratory of Molecular Target & Clinical Pharmacology and the State Key Laboratory of Respiratory Disease
- School of Pharmaceutical Sciences & the Fifth Affiliated Hospital
- Guangzhou Medical University
- Guangzhou 511436
- P. R. China
| | - Bo Han
- State Key Laboratory Breeding Base of Systematic Research Development and Utilization of Chinese Medicine Resources School of Pharmacy
- Chengdu University of Traditional Chinese Medicine
- Chengdu 611137
- P. R. China
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14
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Shen J, Yang Y, Hou X, Zeng W, Yu A, Zhao X, Meng X. Darzens reaction of thioisatins and sulfonium salts: approach to the synthesis of thiochromenone derivatives with anticancer potency. Org Biomol Chem 2018; 16:3487-3494. [PMID: 29691546 DOI: 10.1039/c8ob00402a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new Darzens reaction of thioisatins and sulfonium salts has, for the first time, been reported. This reaction allows efficient access to thiochromenone derivatives in good to excellent yields under mild reaction conditions. The substrate scope includes both electron-withdrawing and electron-donating groups on both the thioisatins and sulfonium salts. Moreover, some of the synthesized thiochromenone derivatives have been found to show potent anticancer activities against six different cancer cell lines using the methylthiazoltetrazolium (MTT) assay.
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Affiliation(s)
- Jinhui Shen
- Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion, School of Chemistry & Chemical Engineering, Tianjin University of Technology, Tianjin 300384, P. R. China.
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15
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Wu GL, Wu QP. Metal-Free Multicomponent Reaction for Synthesis of 4,5-Disubstituted 1,2,3-(NH
)-Triazoles. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201701587] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Guang-Long Wu
- School of Chemistry and Chemical Engineering; Beijing Institute of Technology; Beijing 100081 People's Republic of China
| | - Qin-Pei Wu
- School of Chemistry and Chemical Engineering; Beijing Institute of Technology; Beijing 100081 People's Republic of China
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16
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Abstract
Cyclopropanes have gained much attention by virtue of their interesting structure and unique reactivity. This review discusses the recent advances in the synthesis of cyclopropanes, and some of the related applications will be discussed.
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Affiliation(s)
- Wanqing Wu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province
- Guangdong Engineering Research Center for Green Fine Chemicals
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou 510640
| | - Zhiming Lin
- Key Laboratory of Functional Molecular Engineering of Guangdong Province
- Guangdong Engineering Research Center for Green Fine Chemicals
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou 510640
| | - Huanfeng Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province
- Guangdong Engineering Research Center for Green Fine Chemicals
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou 510640
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17
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Meisinger N, Roiser L, Monkowius U, Himmelsbach M, Robiette R, Waser M. Asymmetric Synthesis of 2,3-Dihydrobenzofurans by a [4+1] Annulation Between Ammonium Ylides and In Situ Generated o-Quinone Methides. Chemistry 2017; 23:5137-5142. [PMID: 28165173 PMCID: PMC5419452 DOI: 10.1002/chem.201700171] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Indexed: 12/31/2022]
Abstract
A highly enantio‐ and diastereoselective [4+1] annulation between in situ generated ammonium ylides and o‐quinone methides for the synthesis of a variety of 2,3‐dihydrobenzofurans has been developed. The key factors controlling the reactivity and stereoselectivity were systematically investigated by experimental and computational means and the energy profiles obtained provide a deeper insight into the mechanistic details of this reaction.
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Affiliation(s)
- Nicole Meisinger
- Johannes Kepler University Linz, Institute of Organic Chemistry, Altenbergerstrasse 69, 4040, Linz, Austria
| | - Lukas Roiser
- Johannes Kepler University Linz, Institute of Organic Chemistry, Altenbergerstrasse 69, 4040, Linz, Austria
| | - Uwe Monkowius
- Johannes Kepler University Linz, Institute of Inorganic Chemistry, Altenbergerstrasse 69, 4040, Linz, Austria
| | - Markus Himmelsbach
- Johannes Kepler University Linz, Institute of Analytical Chemistry, Altenbergerstrasse 69, 4040, Linz, Austria
| | - Raphaël Robiette
- Université catholique de Louvain, Institute of Condensed Matter and Nanosciences, Place Louis Pasteur 1 box L4.01.02, 1348, Louvain-la-Neuve, Belgium
| | - Mario Waser
- Johannes Kepler University Linz, Institute of Organic Chemistry, Altenbergerstrasse 69, 4040, Linz, Austria
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18
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Jin SJ, Guo JM, Zhu YS, Wang QL, Bu ZW. A copper-catalyzed tandem reaction for the construction of coumarin fused 9H-pyrrolo[1,2-a]indoles. Org Biomol Chem 2017; 15:8729-8737. [DOI: 10.1039/c7ob02307c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient copper-catalyzed Friedel–Crafts alkylation/cyclization/isomerization sequence of 3-arylcarbonyl coumarins and 3-methyl indole was developed to afford a wide range of functionalized coumarin fused 9H-pyrrolo[1,2-a]indoles with a 6-6-5-5-6 pentacyclic core.
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Affiliation(s)
- Shao-Jing Jin
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng 475004
- China
| | - Jiao-Mei Guo
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng 475004
- China
| | - Yan-Shuo Zhu
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng 475004
- China
| | - Qi-Lin Wang
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng 475004
- China
| | - Zhan-Wei Bu
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng 475004
- China
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19
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Midya SP, Gopi E, Satam N, Namboothiri INN. Synthesis of fused cyanopyrroles and spirocyclopropanes via addition of N-ylides to chalconimines. Org Biomol Chem 2017; 15:3616-3627. [DOI: 10.1039/c7ob00529f] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
DABCO-ylides react as a one-carbon source with chalconimines to afford fused cyanopyrrolesvia[4 + 1] annulation and spirocyclopropanesvia[2 + 1] annulation.
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Affiliation(s)
- Siba Prasad Midya
- Department of Chemistry Indian Institute of Technology
- Mumbai 400 076
- India
| | - Elumalai Gopi
- Department of Chemistry Indian Institute of Technology
- Mumbai 400 076
- India
| | - Nishikant Satam
- Department of Chemistry Indian Institute of Technology
- Mumbai 400 076
- India
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