1
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Zhou H, Li Z, Chen J, Zhou S, Wang X, Zhang L, Chen J, Lv N. Synthesis of polysubstituted pyridazines via Cu-mediated C(sp 3)-C(sp 3) coupling/annulation of saturated ketones with acylhydrazones. Chem Commun (Camb) 2024; 60:9546-9549. [PMID: 39145417 DOI: 10.1039/d4cc02760d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/16/2024]
Abstract
Pyridazine is a significant skeleton that widely exists in drugs and bioactive molecules. We herein describe expeditious approaches to access polysubstituted pyridazines from readily accessible unactivated ketones and acylhydrazones via Cu-promoted C(sp3)-C(sp3) coupling/cyclization sequences in a single-step fashion. Notably, the disparate 3,4,6-trisubstituted pyridazines and 3,5-disubstituted pyridazines could be obtained by tailoring the ketone's structure and reaction conditions. These transformations feature good functional group compatibility, excellent step-economy, and chemoselectivity. The potential synthetic utility of these conversions is illustrated by scale-up reactions and late-stage derivatizations of the as-prepared pyridazine products.
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Affiliation(s)
- Honggui Zhou
- College of Chemistry & Materials Engineering, Wenzhou University, Wenzhou 325035, China.
| | - Zhefeng Li
- College of Chemistry & Materials Engineering, Wenzhou University, Wenzhou 325035, China.
| | - Juehong Chen
- College of Chemistry & Materials Engineering, Wenzhou University, Wenzhou 325035, China.
| | - Si Zhou
- College of Chemistry & Materials Engineering, Wenzhou University, Wenzhou 325035, China.
| | - Xinyu Wang
- College of Chemistry & Materials Engineering, Wenzhou University, Wenzhou 325035, China.
| | - Linwei Zhang
- College of Chemistry & Materials Engineering, Wenzhou University, Wenzhou 325035, China.
| | - Jiuxi Chen
- College of Chemistry & Materials Engineering, Wenzhou University, Wenzhou 325035, China.
| | - Ningning Lv
- College of Chemistry & Materials Engineering, Wenzhou University, Wenzhou 325035, China.
- Key Lab of Biohealth Materials and Chemistry of Wenzhou, Wenzhou 325035, China
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2
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Bao M, Bohórquez ARR, Arman H, Doyle MP. Photoinduced [4 + 2]-cycloaddition reactions of vinyldiazo compounds for the construction of heterocyclic and bicyclic rings. Chem Sci 2024; 15:12042-12046. [PMID: 39092125 PMCID: PMC11290432 DOI: 10.1039/d4sc03558e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2024] [Accepted: 06/27/2024] [Indexed: 08/04/2024] Open
Abstract
Highly selective formal [4 + 2]-cycloaddition of vinyldiazoacetates with azoalkenes from α-halohydrazones, as well as with cyclopentadiene and furan, occurs with light irradiation at room temperature, producing highly functionalized heterocyclic and bicyclic compounds in good yields and excellent diastereoseletivity. Under blue light these vinyldiazoacetate reagents selectively form unstable cyclopropenes that undergo intermolecular cycloaddition reactions at a faster rate than their competitive ene dimerization. [4 + 2]-cycloaddition of vinyldiazoacetates with in situ formed azoalkenes produces bicyclo[4.1.0]tetrahydropyridazine derivatives and, together with their cycloaddition using cyclopentadiene and furan that form tricyclic compounds, they occur with high chemoselectivity and diastereocontrol, good functional group tolerance, and excellent scalability. Subsequent transformations portray the synthetic versatility of these structures.
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Affiliation(s)
- Ming Bao
- Department of Chemistry, The University of Texas at San Antonio San Antonio Texas 78249 USA
| | - Arnold R Romero Bohórquez
- Department of Chemistry, The University of Texas at San Antonio San Antonio Texas 78249 USA
- Grupo de Investigación en Compuestos Orgánicos de Interés Medicinal (CODEIM), Parque Tecnológico Guatiguará, Universidad Industrial de Santander A. A. 678 Piedecuesta Colombia
| | - Hadi Arman
- Department of Chemistry, The University of Texas at San Antonio San Antonio Texas 78249 USA
| | - Michael P Doyle
- Department of Chemistry, The University of Texas at San Antonio San Antonio Texas 78249 USA
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3
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Meng Y, Gu J, Xin M, Jiang Y, Du Z, Lu G, Jiang J, Chan ASC, Ke Z, Zou Y. Chalcone-Based Synthesis of Tetrahydropyridazines via Cloke-Wilson-Type Rearrangement-Involved Tandem Reaction between Cyclopropyl Ketones and Hydrazines. J Org Chem 2024; 89:2726-2740. [PMID: 38307838 DOI: 10.1021/acs.joc.3c02824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2024]
Abstract
A facile and efficient approach for the synthesis of multisubstituted tetrahydropyridazines starting from cyclopropyl ketones and hydrazines has been developed. The transformation is chalcone-based and takes place via a Cloke-Wilson-type rearrangement-involved tandem reaction catalyzed by TfOH in HFIP.
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Affiliation(s)
- Yingfen Meng
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, People's Republic of China
| | - Jiayi Gu
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, People's Republic of China
| | - Meixiu Xin
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, People's Republic of China
| | - Yi Jiang
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, People's Republic of China
| | - Zhibo Du
- Zhongshan WanHan Pharmceutical Company, Ltd., Zhongshan 528451, People's Republic of China
| | - Guoqing Lu
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, People's Republic of China
| | - Jiayao Jiang
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, People's Republic of China
| | - Albert S C Chan
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, People's Republic of China
| | - Zhuofeng Ke
- School of Materials Science & Engineering, PCFM Lab, Sun Yat-sen University, Guangzhou 510006, People's Republic of China
| | - Yong Zou
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou 510006, People's Republic of China
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4
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Wu Y, Wu X, Liu L, Yu JT, Pan C. Photocatalytic Carbosulfonylation/Cyclization of N-Homoallyl and N-Allyl Aldehyde Hydrazones toward Sulfonylated Tetrahydropyridazines and Dihydropyrazoles. Org Lett 2024; 26:122-126. [PMID: 38160407 DOI: 10.1021/acs.orglett.3c03733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
N'-Benzylidene-N-homoallylacetohydrazides were designed and synthesized as novel skeletons for the construction of functionalized tetrahydropyridazines. A series of aryl- and alkylsulfonylated tetrahydropyridazines were obtained in yields of up to 94% employing sulfonyl chlorides as the sulfonyl radical sources under visible-light irradiation. Besides, sulfonylated dihydropyrazoles were also produced from N-allyl-N'-benzylideneacetohydrazides. Mechanistic investigations indicated that both energy transfer and single electron transfer processes were involved in accomplishing the radical 6/5-endo-trig cyclization to the C═N bond.
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Affiliation(s)
- Yechun Wu
- School of Petrochemical Engineering, Changzhou University, Changzhou 213164, P. R. China
| | - Xian Wu
- School of Petrochemical Engineering, Changzhou University, Changzhou 213164, P. R. China
| | - Lingli Liu
- School of Petrochemical Engineering, Changzhou University, Changzhou 213164, P. R. China
| | - Jin-Tao Yu
- School of Petrochemical Engineering, Changzhou University, Changzhou 213164, P. R. China
| | - Changduo Pan
- School of Petrochemical Engineering, Changzhou University, Changzhou 213164, P. R. China
- School of Chemistry and Chemical Engineering, Jiangsu University of Technology, Changzhou 213001, P. R. China
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5
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Katiyar S, Kumar A, Sashidhara KV. Silver-catalyzed decarboxylative cyclization for the synthesis of substituted pyrazoles from 1,2-diaza-1,3-dienes and α-keto acids. Chem Commun (Camb) 2022; 58:7297-7300. [PMID: 35678363 DOI: 10.1039/d2cc01793h] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A silver-catalyzed decarboxylative cyclization process has been developed for the synthesis of substituted pyrazoles from the readily available 1,2-diaza-1,3-dienes and α-keto acids. Under the optimized conditions, a series of multisubstituted pyrazoles were well prepared in moderate to good yields. In addition, the synthetic utility of this protocol has been demonstrated by synthesizing analogs of FDA approved drugs such as anti-inflammatory drug, lonazolac and antiobesity drug, rimonabant.
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Affiliation(s)
- Sarita Katiyar
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Sector 10, Jankipuram Extension, Sitapur Road, Lucknow 226031, UP, India. .,Academy of Scientific and Innovative Research, CSIR- Human Resource Development Centre, (CSIR-HRDC) Campus, Sector 19, Kamla Nehru Nagar, Ghaziabad, Uttar Pradesh - 201002, India
| | - Abhishek Kumar
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Sector 10, Jankipuram Extension, Sitapur Road, Lucknow 226031, UP, India.
| | - Koneni V Sashidhara
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Sector 10, Jankipuram Extension, Sitapur Road, Lucknow 226031, UP, India. .,Academy of Scientific and Innovative Research, CSIR- Human Resource Development Centre, (CSIR-HRDC) Campus, Sector 19, Kamla Nehru Nagar, Ghaziabad, Uttar Pradesh - 201002, India.,Sophisticated Analytical Instrument Facility & Research, CSIR-Central Drug Research Institute, Sector 10, Jankipuram Extension, Sitapur Road, Lucknow 226031, UP, India
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6
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Shen LW, Zhang YP, You Y, Zhao JQ, Wang ZH, Yuan WC. Inverse Electron-Demand Aza-Diels-Alder Reaction of α,β-Unsaturated Thioesters with In Situ-Generated 1,2-Diaza-1,3-dienes for the Synthesis of 1,3,4-Thiadiazines. J Org Chem 2022; 87:4232-4240. [PMID: 35212520 DOI: 10.1021/acs.joc.1c03072] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A highly regioselective inverse electron-demand aza-Diels-Alder reaction of α,β-unsaturated thioesters with 1,2-diaza-1,3-dienes generated in situ from α-halogeno hydrazones was developed. With α,β-unsaturated thioesters as C═S dienophiles, the developed protocol enables the formation of diverse 3,6-dihydro-2H-1,3,4-thiadiazine derivatives in excellent yields. In the presence of lithium aluminum hydride, 3,6-dihydro-2H-1,3,4-thiadiazine derivatives could be further transformed into 5,6-dihydro-4H-1,3,4-thiadiazines in good yields.
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Affiliation(s)
- Li-Wen Shen
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China.,Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yan-Ping Zhang
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Yong You
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Jian-Qiang Zhao
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Zhen-Hua Wang
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Wei-Cheng Yuan
- Innovation Research Center of Chiral Drugs, Institute for Advanced Study, Chengdu University, Chengdu 610106, China
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7
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Jangir N, Poonam, Dhadda S, Jangid DK. Recent advances in the synthesis of five‐ and six‐membered heterocycles as bioactive skeleton: A concise overview. ChemistrySelect 2022. [DOI: 10.1002/slct.202103139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Nidhi Jangir
- Department of Chemistry (Centre of Advanced Study) University of Rajasthan JLN Marg Jaipur Rajasthan India- 302004
| | - Poonam
- Department of Chemistry (Centre of Advanced Study) University of Rajasthan JLN Marg Jaipur Rajasthan India- 302004
| | - Surbhi Dhadda
- Department of Chemistry (Centre of Advanced Study) University of Rajasthan JLN Marg Jaipur Rajasthan India- 302004
| | - Dinesh K. Jangid
- Department of Chemistry (Centre of Advanced Study) University of Rajasthan JLN Marg Jaipur Rajasthan India- 302004
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8
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Hazarika H, Chutia K, Das B, Gogoi P. One-pot synthesis of 3-substituted-3-hydroxyindolin-2-ones: three component coupling of N-protected isatin, aryne precursor and 1,3-cyclodione under metal-free conditions. NEW J CHEM 2022. [DOI: 10.1039/d1nj04295e] [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 transition-metal free synthetic strategy for the direct synthesis of 3-substituted-3-hydroxy-indolin-2-ones via three component coupling of N-protected isatin, aryne precursor, and 1,3-cyclodione.
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Affiliation(s)
- Hemanta Hazarika
- Applied Organic Chemistry Group, Chemical Science and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, UP, 201002, India
| | - Kangkana Chutia
- Applied Organic Chemistry Group, Chemical Science and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, India
| | - Babulal Das
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Pranjal Gogoi
- Applied Organic Chemistry Group, Chemical Science and Technology Division, CSIR-North East Institute of Science and Technology, Jorhat 785006, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, UP, 201002, India
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9
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Aza-Diels-Alder reaction of both electron-deficient azoalkenes with electron-deficient 3-phencaylideneoxindoles and 3-aryliminooxindol-2-ones. GREEN SYNTHESIS AND CATALYSIS 2021. [DOI: 10.1016/j.gresc.2021.08.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
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10
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Wang C, Fang L, Wang Z. Base-induced inverse-electron-demand aza-Diels-Alder reaction of azoalkenes and 1,3,5-triazinanes: Facile approaches to tetrahydro-1,2,4-triazines. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153303] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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11
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Cheng D, Shen Y, Wu Z, Xu X, Yan J. Metal-Free Tandem Oxidative Cyclization for the Synthesis of 1,2-Dihydropyridazines and Pyrazoles. J Org Chem 2021; 86:8563-8575. [PMID: 34133155 DOI: 10.1021/acs.joc.1c00020] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Mediated by 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ), a novel oxidative coupling of hydrazones and 1,3-diarylpropenes has been disclosed to generate appealing β,γ-unsaturated hydrazones, which further undergo 5-exo-trig or 6-endo-trig cascade cyclization to give the respective 1,2-dihydropyridazines or pyrazoles selectively under metal-free conditions. The mechanisms of the coupling and subsequent cyclization are proposed.
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Affiliation(s)
- Dongping Cheng
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Yinqiang Shen
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Ziliang Wu
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Xiaoliang Xu
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Jizhong Yan
- College of Pharmaceutical Science, Zhejiang University of Technology, Hangzhou 310014, P. R. China
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12
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One-pot formal [3+3] cycloaddition of isocyanoacetates with in situ-derived azoalkenes for the synthesis of 1,4-dihydropyrimidine derivatives. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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13
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Mlostoń G, Urbaniak K, Sobiecka M, Heimgartner H, Würthwein EU, Zimmer R, Lentz D, Reissig HU. Hetero-Diels-Alder Reactions of In Situ-Generated Azoalkenes with Thioketones; Experimental and Theoretical Studies. Molecules 2021; 26:2544. [PMID: 33925483 PMCID: PMC8123831 DOI: 10.3390/molecules26092544] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 04/20/2021] [Accepted: 04/22/2021] [Indexed: 11/18/2022] Open
Abstract
The hetero-Diels-Alder reactions of in situ-generated azoalkenes with thioketones were shown to offer a straightforward method for an efficient and regioselective synthesis of scarcely known N-substituted 1,3,4-thiadiazine derivatives. The scope of the method was fairly broad, allowing the use of a series of aryl-, ferrocenyl-, and alkyl-substituted thioketones. However, in the case of N-tosyl-substituted cycloadducts derived from 1-thioxo-2,2,4,4-tetramethylcyclobutan-3-one and the structurally analogous 1,3-dithione, a more complicated pathway was observed. By elimination of toluene sulfinic acid, the initially formed cycloadducts afforded 2H-1,3,4-thiadiazines as final products. Advanced DFT calculations revealed that the observed high regioselectivity was due to kinetic reaction control and that the (4 + 2)-cycloadditions of sterically less unhindered thiones occurred via highly unsymmetric transition states with shorter C..S-distances (2.27-2.58 Å) and longer N..C-distances (3.02-3.57 Å). In the extreme case of the sterically very hindered 2,2,4,4-tetramethylcyclobutan-1,3-dione-derived thioketones, a zwitterionic intermediate with a fully formed C‒S bond was detected, which underwent ring closure to the 1,3,4-thiadiazine derivative in a second step. For the hypothetical formation of the regioisomeric 1,2,3-thiadiazine derivatives, the DFT calculations proposed more symmetric transition states with considerably higher energies.
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Affiliation(s)
- Grzegorz Mlostoń
- Department of Organic and Applied Chemistry, Faculty of Chemistry, University of Lodz, 12 Tamka Street, 91-403 Lodz, Poland; (K.U.); (M.S.)
| | - Katarzyna Urbaniak
- Department of Organic and Applied Chemistry, Faculty of Chemistry, University of Lodz, 12 Tamka Street, 91-403 Lodz, Poland; (K.U.); (M.S.)
| | - Malwina Sobiecka
- Department of Organic and Applied Chemistry, Faculty of Chemistry, University of Lodz, 12 Tamka Street, 91-403 Lodz, Poland; (K.U.); (M.S.)
| | - Heinz Heimgartner
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland;
| | - Ernst-Ulrich Würthwein
- Organisch-Chemisches Institut and Center for Multiscale Theory and Computation (CMTC), Westfälische Wilhelms-Universität Münster, Corrensstrasse 40, 48149 Münster, Germany
| | - Reinhold Zimmer
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany; (R.Z.); (D.L.)
| | - Dieter Lentz
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany; (R.Z.); (D.L.)
| | - Hans-Ulrich Reissig
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany; (R.Z.); (D.L.)
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14
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Chen T, Che C, Guo Z, Dong XQ, Wang CJ. Diastereoselective synthesis of functionalized tetrahydropyridazines containing indole scaffolds via an inverse-electron-demand aza-Diels–Alder reaction. Org Chem Front 2021. [DOI: 10.1039/d1qo00623a] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A base-promoted and catalyst-free unprecedented inverse-electron-demand aza-Diels–Alder reaction between the in situ generated azoalkenes and 3-vinylindoles has been developed to afford tetrahydropyridazines containing indole scaffolds.
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Affiliation(s)
- Taotao Chen
- Engineering Research Centre of Organosilicon Compounds & Materials
- Ministry of Education
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan
| | - Chao Che
- Engineering Research Centre of Organosilicon Compounds & Materials
- Ministry of Education
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan
| | - Zhefei Guo
- Engineering Research Centre of Organosilicon Compounds & Materials
- Ministry of Education
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan
| | - Xiu-Qin Dong
- Engineering Research Centre of Organosilicon Compounds & Materials
- Ministry of Education
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan
| | - Chun-Jiang Wang
- Engineering Research Centre of Organosilicon Compounds & Materials
- Ministry of Education
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan
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15
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Ye R, Sun J, Han Y, Yan CG. Molecular diversity of TEMPO-mediated cycloaddition of ketohydrazones and 3-phenacylideneoxindoles. NEW J CHEM 2021. [DOI: 10.1039/d0nj06036d] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
This reaction selectively proceeded via aza-Diels–Alder reaction, [3+2] cycloaddition and ring-opening of oxindole to give diverse spirooxindoles and polysubstituted pyrazoles.
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Affiliation(s)
- Rong Ye
- College of Chemistry & Chemical Engineering
- Yangzhou University
- Yangzhou 225002
- People's Republic of China
| | - Jing Sun
- College of Chemistry & Chemical Engineering
- Yangzhou University
- Yangzhou 225002
- People's Republic of China
| | - Ying Han
- College of Chemistry & Chemical Engineering
- Yangzhou University
- Yangzhou 225002
- People's Republic of China
| | - Chao-Guo Yan
- College of Chemistry & Chemical Engineering
- Yangzhou University
- Yangzhou 225002
- People's Republic of China
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16
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Tu JL, Tang W, Liu F. Photoredox-neutral alkene aminoarylation for the synthesis of 1,4,5,6-tetrahydropyridazines. Org Chem Front 2021. [DOI: 10.1039/d1qo00325a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A mild and redox-neutral protocol is developed for the synthesis of 1,4,5,6-tetrahydropyridazines via photoredox catalysis.
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Affiliation(s)
- Jia-Lin Tu
- Jiangsu Key Laboratory of Neuropsychiatric Diseases and Department of Medicinal Chemistry
- College of Pharmaceutical Sciences
- Soochow University
- Suzhou
- People's Republic of China
| | - Wan Tang
- Jiangsu Key Laboratory of Neuropsychiatric Diseases and Department of Medicinal Chemistry
- College of Pharmaceutical Sciences
- Soochow University
- Suzhou
- People's Republic of China
| | - Feng Liu
- Jiangsu Key Laboratory of Neuropsychiatric Diseases and Department of Medicinal Chemistry
- College of Pharmaceutical Sciences
- Soochow University
- Suzhou
- People's Republic of China
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17
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Zhang X, Pan Y, Wang H, Liang C, Ma X, Jiao W, Shao H. Strategy to Construct 1,2,3‐Triazoles by K
2
CO
3
‐Mediated [4+1] Annulation Reactions of
N
‐Acetyl Hydrazones with Bifunctional Amino Reagents. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202001375] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Xiaoke Zhang
- Natural Products Research Centre,Chengdu Institute of Biology Chinese Academy of Sciences Chengdu People's Republic of China
- Zunyi Medical University Zunyi Guizhou People's Republic of China
- University of Chinese Academy of Sciences People's Republic of China
| | - Yang Pan
- Natural Products Research Centre,Chengdu Institute of Biology Chinese Academy of Sciences Chengdu People's Republic of China
- University of Chinese Academy of Sciences People's Republic of China
| | - Haibo Wang
- Natural Products Research Centre,Chengdu Institute of Biology Chinese Academy of Sciences Chengdu People's Republic of China
- Zhejiang Hongyuan Pharmaceutical Co., Ltd. Chem & APIs. Industrial Zone, Linhai Taizhou Zhejiang People's Republic of China
- University of Chinese Academy of Sciences People's Republic of China
| | - Chong Liang
- Natural Products Research Centre,Chengdu Institute of Biology Chinese Academy of Sciences Chengdu People's Republic of China
| | - Xiaofeng Ma
- Natural Products Research Centre,Chengdu Institute of Biology Chinese Academy of Sciences Chengdu People's Republic of China
| | - Wei Jiao
- Natural Products Research Centre,Chengdu Institute of Biology Chinese Academy of Sciences Chengdu People's Republic of China
| | - Huawu Shao
- Natural Products Research Centre,Chengdu Institute of Biology Chinese Academy of Sciences Chengdu People's Republic of China
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18
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Xu K, Zheng Y, Ye Y, Liu D, Zhang W. Desymmetrization of meso-Dicarbonatecyclohexene with β-Hydrazino Carboxylic Esters via a Pd-Catalyzed Allylic Substitution Cascade. Org Lett 2020; 22:8836-8841. [PMID: 33170017 DOI: 10.1021/acs.orglett.0c03211] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The desymmetrization of meso-dicarbonatecyclohexene with β-hydrazino carboxylic esters has been achieved via a RuPHOX/Pd-catalyzed allylic substitution cascade for the construction of chiral hexahydrocinnoline derivatives with high performance. Mechanistic studies reveal that the reaction exploits a pathway different from that of our previous work and that the first nitrogen nucleophilic process is the rate-determining step. The protocol could be conducted on a gram scale without any loss of catalytic behavior, and the corresponding chiral hexahydrocinnolines can undergo diverse transformations.
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Affiliation(s)
- Kai Xu
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, P. R. China
| | - Yan Zheng
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, P. R. China
| | - Yong Ye
- Green Catalysis Center, College of Chemistry, Zhengzhou University, 100 Kexue Road, Zhengzhou 450001, P. R. China
| | - Delong Liu
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, P. R. China
| | - Wanbin Zhang
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Pharmacy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, P. R. China.,Green Catalysis Center, College of Chemistry, Zhengzhou University, 100 Kexue Road, Zhengzhou 450001, P. R. China
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19
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Yang T, Deng Z, Wang KH, Li P, Huang D, Su Y, Hu Y. Synthesis of CF 3-Substituted 1,6-Dihydropyridazines by Copper-Promoted Cascade Oxidation/Cyclization of Trifluoromethylated Homoallylic N-Acylhydrazines. J Org Chem 2020; 85:12304-12314. [DOI: 10.1021/acs.joc.0c01568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Tianyu Yang
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
| | - Zhoubin Deng
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
| | - Ke-Hu Wang
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
| | - Pengfei Li
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
| | - Danfeng Huang
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
| | - Yingpeng Su
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
| | - Yulai Hu
- College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
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20
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Regio- and stereochemistry in the aza-Diels–Alder reaction of an azoalkene with furan and 2,3-dihydrofuran: a molecular electron density theory study. Struct Chem 2020. [DOI: 10.1007/s11224-020-01572-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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21
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Li Z, Li S, Kan T, Wang X, Xin X, Hou Y, Gong P. Silver(I)‐ and Base‐Mediated formal [4+3] Cycloaddition of
in Situ
generated 1,2‐Diaza‐1,3‐dienes with
C,N
‐Cyclic Azomethine Imines: An Efficient Protocol for the Synthesis of Tetrazepine Derivatives. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000398] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Zefei Li
- School of Pharmaceutical EngineeringShenyang Pharmaceutical University 103 Wenhua Road, Shenhe District Shenyang 110016 People's Republic of China
| | - Shuaikang Li
- School of Pharmaceutical EngineeringShenyang Pharmaceutical University 103 Wenhua Road, Shenhe District Shenyang 110016 People's Republic of China
| | - Tianjiao Kan
- School of Pharmaceutical EngineeringShenyang Pharmaceutical University 103 Wenhua Road, Shenhe District Shenyang 110016 People's Republic of China
| | - Xinyue Wang
- School of Pharmaceutical EngineeringShenyang Pharmaceutical University 103 Wenhua Road, Shenhe District Shenyang 110016 People's Republic of China
| | - Xin Xin
- School of Pharmaceutical EngineeringShenyang Pharmaceutical University 103 Wenhua Road, Shenhe District Shenyang 110016 People's Republic of China
| | - Yunlei Hou
- School of Pharmaceutical EngineeringShenyang Pharmaceutical University 103 Wenhua Road, Shenhe District Shenyang 110016 People's Republic of China
| | - Ping Gong
- School of Pharmaceutical EngineeringShenyang Pharmaceutical University 103 Wenhua Road, Shenhe District Shenyang 110016 People's Republic of China
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22
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Pan L, Jin F, Fu R, Gao K, Zhou S, Bao X. Oxidative Ring-Opening of 1H
-Pyrazol-5-amines and Its Application in Constructing Pyrazolo-Pyrrolo-Pyrazine Scaffolds by Domino Cyclization. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000265] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Lei Pan
- College of Chemistry, Chemical Engineering and Materials Science; Soochow University; 199 Ren-Ai Road, Suzhou Industrial Park 215123 Suzhou Jiangsu China
| | - Feng Jin
- College of Chemistry, Chemical Engineering and Materials Science; Soochow University; 199 Ren-Ai Road, Suzhou Industrial Park 215123 Suzhou Jiangsu China
| | - Rui Fu
- College of Chemistry, Chemical Engineering and Materials Science; Soochow University; 199 Ren-Ai Road, Suzhou Industrial Park 215123 Suzhou Jiangsu China
| | - Ke Gao
- College of Chemistry, Chemical Engineering and Materials Science; Soochow University; 199 Ren-Ai Road, Suzhou Industrial Park 215123 Suzhou Jiangsu China
| | - Shaofang Zhou
- College of Chemistry, Chemical Engineering and Materials Science; Soochow University; 199 Ren-Ai Road, Suzhou Industrial Park 215123 Suzhou Jiangsu China
| | - Xiaoguang Bao
- College of Chemistry, Chemical Engineering and Materials Science; Soochow University; 199 Ren-Ai Road, Suzhou Industrial Park 215123 Suzhou Jiangsu China
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23
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Duan L, Wang X, Gu Y, Hou Y, Gong P. Regioselective construction of pyridazine and tetrahydrocinnoline derivatives via [4 + 2] cycloaddition–elimination with α-halogeno hydrazones and enaminones. Org Chem Front 2020. [DOI: 10.1039/d0qo00555j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Herein, we report the de novo construction of pyridazine scaffolds via a [4 + 2] cycloaddition–elimination reaction with α-halogeno hydrazones and enaminones.
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Affiliation(s)
- Liancheng Duan
- School of Pharmaceutical Engineering
- Shenyang Pharmaceutical University
- Shenyang
- China
| | - Xin Wang
- School of Pharmaceutical Engineering
- Shenyang Pharmaceutical University
- Shenyang
- China
| | - Yucheng Gu
- Syngenta Jealott's Hill International Research Center
- Berkshire RG42 6EY
- UK
| | - Yunlei Hou
- School of Pharmaceutical Engineering
- Shenyang Pharmaceutical University
- Shenyang
- China
| | - Ping Gong
- School of Pharmaceutical Engineering
- Shenyang Pharmaceutical University
- Shenyang
- China
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24
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Feng J, He T, Xie Y, Yu Y, Baell JB, Huang F. I 2-Promoted [4 + 2] cycloaddition of in situ generated azoalkenes with enaminones: facile and efficient synthesis of 1,4-dihydropyridazines and pyridazines. Org Biomol Chem 2020; 18:9483-9493. [PMID: 33179698 DOI: 10.1039/d0ob01958e] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A facile and efficient strategy for the synthesis of 1,4-dihydropyridazines and pyridazines through I2-promoted [4 + 2] cycloaddition of in situ generated azoalkenes with enaminones has been developed. The switch in selectivity is attributed to the judicious choice of different reaction temperatures. The key features of this work include controllable and selective synthesis, good functional group tolerance, good to excellent reaction yields, metal/base-free conditions, and also applicability to one-pot methodology.
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Affiliation(s)
- Jiajun Feng
- School of Pharmaceutical Sciences, Nanjing Tech University, Nanjing 211816, P. R. China.
| | - Tiantong He
- School of Pharmaceutical Sciences, Nanjing Tech University, Nanjing 211816, P. R. China.
| | - Yuxing Xie
- School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, Nanjing 210023, P. R. China
| | - Yang Yu
- School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211816, P. R. China
| | - Jonathan B Baell
- School of Pharmaceutical Sciences, Nanjing Tech University, Nanjing 211816, P. R. China. and Medicinal Chemistry Theme, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria 3052, Australia
| | - Fei Huang
- School of Pharmaceutical Sciences, Nanjing Tech University, Nanjing 211816, P. R. China. and School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, Nanjing 210023, P. R. China
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25
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Yin W, Fang L, Wang Z, Gao F, Li Z, Wang Z. Synthesis of Bicyclo[4.1.0]tetrahydropyridazines by a Sequential [4 + 2] and [1 + 2] Annulation Reaction of Azoalkenes and Crotonate-Derived Sulfur Ylides. Org Lett 2019; 21:7361-7364. [PMID: 31483675 DOI: 10.1021/acs.orglett.9b02661] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The base-induced unprecedented tandem [4 + 2] and [1 + 2] annulation reaction of in situ formed 1,2-diaza-1,3-dienes and crotonate-derived sulfur ylides is reported. This protocol provides a novel and practical method for the synthesis of cyclopropane-fused tetrahydropyridazines with a quaternary carbon center in synthetically useful yield. In this tandem reaction, three new bonds were formed in one pot, and the crotonate-derived sulfur ylide serves as a C3 synthon.
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Affiliation(s)
- Wenhao Yin
- School of Chemistry and Chemical Engineering , Chongqing University , Chongqing 401331 , China
| | - Ling Fang
- College of Environment and Resources , Chongqing Technology and Business University , Chongqing 400067 , China
| | - Zhiyong Wang
- School of Chemistry and Chemical Engineering , Chongqing University , Chongqing 401331 , China
| | - Fang Gao
- School of Chemistry and Chemical Engineering , Chongqing University , Chongqing 401331 , China
| | - Zhefeng Li
- School of Chemistry and Chemical Engineering , Chongqing University , Chongqing 401331 , China
| | - Zhiyong Wang
- School of Chemistry and Chemical Engineering , Chongqing University , Chongqing 401331 , China
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26
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Ye R, Yan CG. Construction of Spiro[indoline-3,3′-pyridazines] and Spiro[indene-2,3′-pyridazines] via TEMPO-Mediated Oxidative Aza-Diels-Alder Reactions. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900955] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Rong Ye
- College of Chemistry & Chemical Engineering; Yangzhou University; 225002 Yangzhou China
| | - Chao-Guo Yan
- College of Chemistry & Chemical Engineering; Yangzhou University; 225002 Yangzhou China
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27
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Mishra M, De PB, Pradhan S, Punniyamurthy T. Stereospecific Copper(II)-Catalyzed Tandem Ring Opening/Oxidative Alkylation of Donor-Acceptor Cyclopropanes with Hydrazones: Synthesis of Tetrahydropyridazines. J Org Chem 2019; 84:10901-10910. [PMID: 31385502 DOI: 10.1021/acs.joc.9b01506] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Aerobic copper(II)-catalyzed tandem ring opening and oxidative C-H alkylation of donor-acceptor cyclopropanes with bisaryl hydrazones is accomplished to produce tetrahydropyridazines, in which copper(II) plays dual role as a Lewis acid as well as redox catalyst. The reaction is stereospecific, and optically active cyclopropanes can be reacted with high optical purities (89-98% enantiomeric excess). The substrate scope, functional group tolerance, dual role of the copper(II) catalyst, and the use of air as an oxidant are the important practical features. A product bearing a 3-bromoaryl group can be subjected to Pd-catalyzed Suzuki coupling with boronic acid in high yield.
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Affiliation(s)
- Manmath Mishra
- Department of Chemistry , Indian Institute of Technology Guwahati , Guwahati 781039 , India
| | - Pinaki Bhusan De
- Department of Chemistry , Indian Institute of Technology Guwahati , Guwahati 781039 , India
| | - Sourav Pradhan
- Department of Chemistry , Indian Institute of Technology Guwahati , Guwahati 781039 , India
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28
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Hu S, Du S, Yang Z, Ni L, Chen Z. Synthesis of Multi‐substituted Dihydropyrazoles by Copper‐Mediated [4+1] Cycloaddition Reaction of
N
‐Sulfonylhydrazones and Sulfoxonium Ylides. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900212] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Sipei Hu
- Department of ChemistryZhejiang Sci-Tech University Hangzhou 310018 People's Republic of China
| | - Shiying Du
- Department of ChemistryZhejiang Sci-Tech University Hangzhou 310018 People's Republic of China
| | - Zuguang Yang
- Department of ChemistryZhejiang Sci-Tech University Hangzhou 310018 People's Republic of China
| | - Lingfang Ni
- Department of ChemistryZhejiang Sci-Tech University Hangzhou 310018 People's Republic of China
| | - Zhengkai Chen
- Department of ChemistryZhejiang Sci-Tech University Hangzhou 310018 People's Republic of China
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29
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Chen Z, Meng L, Ding Z, Hu J. Construction of Versatile N-Heterocycles from in situ Generated 1,2-Diaza-1,3-dienes. CURR ORG CHEM 2019. [DOI: 10.2174/1385272823666190227162840] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
N-Heterocyclic architectures are omnipresent in many bioactive natural
products, synthetic drugs, and materials science, thus have evoked a vast research interest
of academic, as well as industrial chemists. Recently, several efficient methods have been
developed for the preparation of various nitrogen-containing compounds with in situ generated
1,2-diaza-1,3-dienes from the easily available precursors including α -haloketohydrazones,
α-hydroxyl ketohydrazones, thiadiazole dioxides or their analogues, and
other simple hydrazones. These methods are considered powerful tools in the synthesis of
five-, six- and seven-membered ring heterocyclic compounds with good to excellent levels
of conversions and selectivities. This review mainly summarizes recent advances on the
chemistry of construction of versatile N-heterocycles from in situ generated 1,2-diaza-1,3-
dienes and presents an extensive summary of the application scopes and limitations of the corresponding cyclization
reactions. Moreover, enantioselective approaches are also covered.
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Affiliation(s)
- Zhangpei Chen
- Center for Molecular Science and Engineering, Northeastern University, Shenyang 110819, China
| | - Lingxin Meng
- Center for Molecular Science and Engineering, Northeastern University, Shenyang 110819, China
| | - Zhiqiang Ding
- Center for Molecular Science and Engineering, Northeastern University, Shenyang 110819, China
| | - Jianshe Hu
- Center for Molecular Science and Engineering, Northeastern University, Shenyang 110819, China
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30
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Huo H, A R, Gong Y. Formal [3 + 3] Cycloaddition Reactions between Electron-Deficient Cyclopropenes and Hydrazones: A Route to Alkyl 1,4,5,6-Tetrahydropyridazine-3-carboxylates. J Org Chem 2019; 84:2093-2101. [DOI: 10.1021/acs.joc.8b03105] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Hengrui Huo
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China
| | - Runa A
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China
| | - Yuefa Gong
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, China
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31
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Wu Q, Shao PL, He Y. Synthesis of 1,4,5,6-tetrahydropyridazines and pyridazines via transition-metal-free (4 + 2) cycloaddition of alkoxyallenes with 1,2-diaza-1,3-dienes. RSC Adv 2019; 9:21507-21512. [PMID: 35521294 PMCID: PMC9066181 DOI: 10.1039/c9ra02712b] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Accepted: 07/04/2019] [Indexed: 12/19/2022] Open
Abstract
We developed an economical and practical protocol for the synthesis of 1,4,5,6-tetrahydropyridazines. A diverse range of alkoxyallenes and 1,2-diaza-1,3-dienes undergo (4 + 2) cycloaddition to generate the desired products in excellent yields. The high efficiency, wide substrate scope and good functional group tolerance of this process, coupled with operational simplicity, render the method synthetically attractive. The utility of the cycloaddition is also demonstrated by the preparation of various pyridazines from 1,4,5,6-tetrahydropyridazines. We developed an economical and practical protocol for the synthesis of 1,4,5,6-tetrahydropyridazines and pyridazines via cyclization of alkoxyallenes and 1,2-diaza-1,3-dienes.![]()
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Affiliation(s)
- Qi Wu
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research
- School of Pharmaceutical Sciences
- Chongqing University
- Chongqing 401331
- People's Republic of China
| | - Pan-Lin Shao
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research
- School of Pharmaceutical Sciences
- Chongqing University
- Chongqing 401331
- People's Republic of China
| | - Yun He
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research
- School of Pharmaceutical Sciences
- Chongqing University
- Chongqing 401331
- People's Republic of China
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32
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Neog K, Dutta D, Das B, Gogoi P. Aryne insertion into the PO bond: one-pot synthesis of quaternary phosphonium triflates. Org Biomol Chem 2019; 17:6450-6460. [DOI: 10.1039/c9ob01157a] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel transition-metal free synthetic strategy for the direct synthesis of quaternary phosphonium triflates via insertion of aryne into phosphine oxide.
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Affiliation(s)
- Kashmiri Neog
- Applied Organic Chemistry Group
- Chemical Science and Technology Division
- CSIR-North East Institute of Science and Technology
- Jorhat 785006
- India
| | - Dhiraj Dutta
- Applied Organic Chemistry Group
- Chemical Science and Technology Division
- CSIR-North East Institute of Science and Technology
- Jorhat 785006
- India
| | - Babulal Das
- Department of Chemistry
- Indian Institute of Technology Guwahati
- Guwahati-781039
- India
| | - Pranjal Gogoi
- Applied Organic Chemistry Group
- Chemical Science and Technology Division
- CSIR-North East Institute of Science and Technology
- Jorhat 785006
- India
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33
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Wei L, Shen C, Hu YZ, Tao HY, Wang CJ. Enantioselective synthesis of multi-nitrogen-containing heterocycles using azoalkenes as key intermediates. Chem Commun (Camb) 2019; 55:6672-6684. [PMID: 31134230 DOI: 10.1039/c9cc02371b] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Chiral multi-nitrogen-containing heterocycles, such as pyrazole, imidazole and pyridazine, are widely found in naturally occurring organic compounds and pharmaceuticals, and hence, their stereoselective and efficient synthesis is an important issue in organic synthesis. Out of the variety of methods that have been developed over the past century, the catalytic asymmetric cyclization and cycloaddition reactions are recognized as the most synthetically useful strategies due to their step-, atom- and redox-economic nature. In particular, the recently developed annulation reactions using azoalkenes as key intermediates show their great ability to construct diverse types of multi-nitrogen-containing heterocycles. In this feature article, we critically analyse the strategic development and the efficient transformation of azoalkenes to chiral heterocycles and α-functionalized ketone derivatives since 2010. The plausible mechanism for each reaction model is also discussed.
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Affiliation(s)
- Liang Wei
- Engineering Research Center of Organosilicon Compounds & Materials, Ministry of Education, College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China.
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34
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Arunprasath D, Devi Bala B, Sekar G. Luxury of
N
‐Tosylhydrazones in Transition‐Metal‐Free Transformations. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201801031] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Dhanarajan Arunprasath
- Department of ChemistryIndian Institute of Technology Madras Chennai – 600036 Tamil Nadu India
| | | | - Govindasamy Sekar
- Department of ChemistryIndian Institute of Technology Madras Chennai – 600036 Tamil Nadu India
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35
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Lopes SMM, Cardoso AL, Lemos A, Pinho E Melo TMVD. Recent Advances in the Chemistry of Conjugated Nitrosoalkenes and Azoalkenes. Chem Rev 2018; 118:11324-11352. [PMID: 30495939 DOI: 10.1021/acs.chemrev.8b00375] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This review aims to present the most recent contributions in the chemistry of nitrosoalkenes and azoalkenes, highlighting the chemical behavior that makes them important and versatile building blocks in organic synthesis. These are heterodienes used in the assembly of a variety of heterocyclic systems, spanning from five- to seven-membered heterocycles, as well as for the functionalization of heterocycles.
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Affiliation(s)
- Susana M M Lopes
- CQC and Department of Chemistry , University of Coimbra , 3004-535 Coimbra , Portugal
| | - Ana L Cardoso
- CQC and Department of Chemistry , University of Coimbra , 3004-535 Coimbra , Portugal
| | - Américo Lemos
- Centro de Investigação em Química do Algarve, Faculdade de Ciências e Tecnologia , University of Algarve , Campus de Gambelas, 8005-139 Faro , Portugal
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36
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Mari G, De Crescentini L, Favi G, Santeusanio S, Mantellini F. 1,2-Diaza-1,3-diene-Based Multicomponent Reactions in Sequential Protocols to Synthesize Arylamino-5-hydrazonothiophene-3-carboxylates. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801228] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Giacomo Mari
- Department of Biomolecular Sciences; Section of Organic Chemistry and Organic Natural Compounds; University of Urbino “Carlo Bo”; Via I Maggetti 24 61029 Urbino (PU) Italy
| | - Lucia De Crescentini
- Department of Biomolecular Sciences; Section of Organic Chemistry and Organic Natural Compounds; University of Urbino “Carlo Bo”; Via I Maggetti 24 61029 Urbino (PU) Italy
| | - Gianfranco Favi
- Department of Biomolecular Sciences; Section of Organic Chemistry and Organic Natural Compounds; University of Urbino “Carlo Bo”; Via I Maggetti 24 61029 Urbino (PU) Italy
| | - Stefania Santeusanio
- Department of Biomolecular Sciences; Section of Organic Chemistry and Organic Natural Compounds; University of Urbino “Carlo Bo”; Via I Maggetti 24 61029 Urbino (PU) Italy
| | - Fabio Mantellini
- Department of Biomolecular Sciences; Section of Organic Chemistry and Organic Natural Compounds; University of Urbino “Carlo Bo”; Via I Maggetti 24 61029 Urbino (PU) Italy
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37
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Liu BB, Bai HW, Liu H, Wang SY, Ji SJ. Cascade Trisulfur Radical Anion (S3•–) Addition/Electron Detosylation Process for the Synthesis of 1,2,3-Thiadiazoles and Isothiazoles. J Org Chem 2018; 83:10281-10288. [DOI: 10.1021/acs.joc.8b01450] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Bei-Bei Liu
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, People’s Republic of China
| | - Hui-Wen Bai
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, People’s Republic of China
| | - Huan Liu
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, People’s Republic of China
| | - Shun-Yi Wang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, People’s Republic of China
| | - Shun-Jun Ji
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215123, People’s Republic of China
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38
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Guo YQ, Zhao MN, Ren ZH, Guan ZH. Copper-Promoted 6- endo-trig Cyclization of β,γ-Unsaturated Hydrazones for the Synthesis of 1,6-Dihydropyridazines. Org Lett 2018; 20:3337-3340. [PMID: 29790767 DOI: 10.1021/acs.orglett.8b01240] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A novel and efficient strategy for the synthesis of 1,6-dihydropyridazines via copper-promoted 6- endo-trig cyclization of readily available β,γ-unsaturated hydrazones have been developed. A series of 1,6-dihydropyridazines have been synthesized by this method with good yields, high functional group tolerance, and remarkable regioselectivity under mild conditions. Importantly, the 1,6-dihydropyridazines can be efficiently converted to biologically important pyridazines in the presence of NaOH.
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Affiliation(s)
- Yong-Qiang Guo
- Key Laboratory of Synthetic and Nature Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science , Northwest University , Xi'an 710127 , P. R. China
| | - Mi-Na Zhao
- Key Laboratory of Synthetic and Nature Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science , Northwest University , Xi'an 710127 , P. R. China
| | - Zhi-Hui Ren
- Key Laboratory of Synthetic and Nature Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science , Northwest University , Xi'an 710127 , P. R. China
| | - Zheng-Hui Guan
- Key Laboratory of Synthetic and Nature Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science , Northwest University , Xi'an 710127 , P. R. China
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39
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Yu J, Cai C. Photocatalytic oxidative cyclization of α-halo hydrazones with tetrahydroisoquinoline for construction of isoquino[3,4-a][1,2,4]-triazines. CATAL COMMUN 2018. [DOI: 10.1016/j.catcom.2018.02.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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40
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Wang Z, Yang Y, Gao F, Wang Z, Luo Q, Fang L. Synthesis of 5-(Trifluoromethyl)pyrazolines by Formal [4 + 1]-Annulation of Fluorinated Sulfur Ylides and Azoalkenes. Org Lett 2018; 20:934-937. [DOI: 10.1021/acs.orglett.7b03811] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Zhiyong Wang
- School
of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China
| | - Yanzhou Yang
- School
of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China
| | - Fang Gao
- School
of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China
| | - Zhiyong Wang
- School
of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China
| | - Qian Luo
- College
of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China
| | - Ling Fang
- College
of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China
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41
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Zhang ZJ, Song J. An isothiourea-catalyzed asymmetric formal [4 + 2] cycloaddition of in situ generated azoalkenes with C1 ammonium enolates. Org Chem Front 2018. [DOI: 10.1039/c8qo00657a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
An efficient isothiourea-catalyzed stereoselective formal [4 + 2] cycloaddition of α-chloro cyclic hydrazones with carboxylic acids has been developed.
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Affiliation(s)
- Zi-Jing Zhang
- Department of Chemistry
- University of Science and Technology of China
- Hefei 230026
- China
| | - Jin Song
- Department of Chemistry
- University of Science and Technology of China
- Hefei 230026
- China
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42
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Zhao J, Jiang M, Liu JT. Transition metal-free aminofluorination of β,γ-unsaturated hydrazones: base-controlled regioselective synthesis of fluorinated dihydropyrazole and tetrahydropyridazine derivatives. Org Chem Front 2018. [DOI: 10.1039/c7qo01105a] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Various base-controlled regioselective reactions of β,γ-unsaturated hydrazones with Selectfluor were achieved under transition metal-free conditions.
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Affiliation(s)
- Juan Zhao
- Key Laboratory of Organofluorine Chemistry
- Shanghai Institute of Organic Chemistry
- University of Chinese Academy of Sciences
- Chinese Academy of Sciences
- Shanghai 200032
| | - Min Jiang
- Key Laboratory of Organofluorine Chemistry
- Shanghai Institute of Organic Chemistry
- University of Chinese Academy of Sciences
- Chinese Academy of Sciences
- Shanghai 200032
| | - Jin-Tao Liu
- Key Laboratory of Organofluorine Chemistry
- Shanghai Institute of Organic Chemistry
- University of Chinese Academy of Sciences
- Chinese Academy of Sciences
- Shanghai 200032
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43
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Mari G, Verboni M, De Crescentini L, Favi G, Santeusanio S, Mantellini F. Assembly of fully substituted 2,5-dihydrothiophenes via a novel sequential multicomponent reaction. Org Chem Front 2018. [DOI: 10.1039/c8qo00343b] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A sequential multicomponent reaction between ketoesters, isothiocyanates and 1,2-diaza-1,3-dienes to create 2,5-dihydrothiophenes that can be converted into thiophenes.
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Affiliation(s)
- Giacomo Mari
- Department of Biomolecular Sciences
- Section of Organic Chemistry and Organic Natural Compounds
- University of Urbino “Carlo Bo”
- 61029 Urbino (PU)
- Italy
| | - Michele Verboni
- Department of Biomolecular Sciences
- Section of Organic Chemistry and Organic Natural Compounds
- University of Urbino “Carlo Bo”
- 61029 Urbino (PU)
- Italy
| | - Lucia De Crescentini
- Department of Biomolecular Sciences
- Section of Organic Chemistry and Organic Natural Compounds
- University of Urbino “Carlo Bo”
- 61029 Urbino (PU)
- Italy
| | - Gianfranco Favi
- Department of Biomolecular Sciences
- Section of Organic Chemistry and Organic Natural Compounds
- University of Urbino “Carlo Bo”
- 61029 Urbino (PU)
- Italy
| | - Stefania Santeusanio
- Department of Biomolecular Sciences
- Section of Organic Chemistry and Organic Natural Compounds
- University of Urbino “Carlo Bo”
- 61029 Urbino (PU)
- Italy
| | - Fabio Mantellini
- Department of Biomolecular Sciences
- Section of Organic Chemistry and Organic Natural Compounds
- University of Urbino “Carlo Bo”
- 61029 Urbino (PU)
- Italy
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44
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Jiang SP, Liu Z, Lu WQ, Wang GW. Synthesis of fullerotetrahydropyridazines via the copper-catalyzed heteroannulation of [60]fullerene with hydrazides. Org Chem Front 2018. [DOI: 10.1039/c7qo01032j] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fullerotetrahydropyridazines have been efficiently synthesized via the copper-catalyzed reaction of [60]fullerene with hydrazides.
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Affiliation(s)
- Sheng-Peng Jiang
- CAS Key Laboratory of Soft Matter Chemistry
- Hefei National Laboratory for Physical Sciences at Microscale
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- and Department of Chemistry
- University of Science and Technology of China
| | - Zhan Liu
- CAS Key Laboratory of Soft Matter Chemistry
- Hefei National Laboratory for Physical Sciences at Microscale
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- and Department of Chemistry
- University of Science and Technology of China
| | - Wen-Qiang Lu
- CAS Key Laboratory of Soft Matter Chemistry
- Hefei National Laboratory for Physical Sciences at Microscale
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- and Department of Chemistry
- University of Science and Technology of China
| | - Guan-Wu Wang
- CAS Key Laboratory of Soft Matter Chemistry
- Hefei National Laboratory for Physical Sciences at Microscale
- iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)
- and Department of Chemistry
- University of Science and Technology of China
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45
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Mari G, De Crescentini L, Favi G, Santeusanio S, Lillini S, Mantellini F. Unexpected Synthesis of 2,3,5,6-Tetrahydro-1H
-pyrrolo[3,4-c
]pyridine-1,3,6-triones by a Double Michael Addition/CS2
Extrusion/Double Cyclization Sequence. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701097] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Giacomo Mari
- Department of Biomolecular Sciences; Organic Chemistry Section and Organic Natural Compounds; University of Urbino “Carlo Bo”; Via I Maggetti 24 61029 Urbino (PU) Italy
| | - Lucia De Crescentini
- Department of Biomolecular Sciences; Organic Chemistry Section and Organic Natural Compounds; University of Urbino “Carlo Bo”; Via I Maggetti 24 61029 Urbino (PU) Italy
| | - Gianfranco Favi
- Department of Biomolecular Sciences; Organic Chemistry Section and Organic Natural Compounds; University of Urbino “Carlo Bo”; Via I Maggetti 24 61029 Urbino (PU) Italy
| | - Stefania Santeusanio
- Department of Biomolecular Sciences; Organic Chemistry Section and Organic Natural Compounds; University of Urbino “Carlo Bo”; Via I Maggetti 24 61029 Urbino (PU) Italy
| | - Samuele Lillini
- Organic Chemistry Section and Organic Natural Compounds; Dompé Farmaceutici s.p.a.; 80131 Naples Italy
| | - Fabio Mantellini
- Department of Biomolecular Sciences; Organic Chemistry Section and Organic Natural Compounds; University of Urbino “Carlo Bo”; Via I Maggetti 24 61029 Urbino (PU) Italy
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46
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Zhao QQ, Chen J, Yan DM, Chen JR, Xiao WJ. Photocatalytic Hydrazonyl Radical-Mediated Radical Cyclization/Allylation Cascade: Synthesis of Dihydropyrazoles and Tetrahydropyridazines. Org Lett 2017. [DOI: 10.1021/acs.orglett.7b01609] [Citation(s) in RCA: 75] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Quan-Qing Zhao
- CCNU-uOttawa
Joint Research Centre, Key Laboratory of Pesticides and Chemical Biology,
Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan 430079, China
| | - Jun Chen
- CCNU-uOttawa
Joint Research Centre, Key Laboratory of Pesticides and Chemical Biology,
Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan 430079, China
| | - Dong-Mei Yan
- CCNU-uOttawa
Joint Research Centre, Key Laboratory of Pesticides and Chemical Biology,
Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan 430079, China
| | - Jia-Rong Chen
- CCNU-uOttawa
Joint Research Centre, Key Laboratory of Pesticides and Chemical Biology,
Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan 430079, China
| | - Wen-Jing Xiao
- CCNU-uOttawa
Joint Research Centre, Key Laboratory of Pesticides and Chemical Biology,
Ministry of Education, College of Chemistry, Central China Normal University, 152 Luoyu Road, Wuhan 430079, China
- State
Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
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47
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Morita S, Matsuo JI. Synthesis of various 6-substituted 1,4,5,6-tetrahydropyridazines by substitution of a 1,4,5,6-tetrahydro-6-tosylhydrazinopyridazines. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.01.069] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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48
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Huang R, Tao HY, Wang CJ. PPh 3-Mediated [4 + 2]- and [4 + 1]-Annulations of Maleimides with Azoalkenes: Access to Fused Tetrahydropyridazine/Pyrrolidinedione and Spiro-dihydropyrazole/Pyrrolidinedione Derivatives. Org Lett 2017; 19:1176-1179. [PMID: 28211696 DOI: 10.1021/acs.orglett.7b00215] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Unprecedented PPh3-mediated [4 + 2]- and [4 + 1]-annulation of maleimides with in situ formed azoalkenes have been successfully developed, affording fused tetrahydropyridazine/pyrrolidinedione and spiro-dihydropyrazole/pyrrolidinedione derivatives in good yields under mild reaction conditions. Maleimides serve as C2 synthons in the [4 + 2]-annulation using 1,2-dichloroethane as the solvent in the presence of 20 mol % of PPh3. With a stoichiometric amount of PPh3 in acetone, maleimides serve as C1 synthons, and the in situ formed phosphorus ylide is the key intermediate to realize this [4 + 1]-annulation.
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Affiliation(s)
- Rong Huang
- College of Chemistry and Molecular Sciences, Wuhan University , Wuhan 430072, China.,State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry , Shanghai 230012, China
| | - Hai-Yan Tao
- College of Chemistry and Molecular Sciences, Wuhan University , Wuhan 430072, China.,State Key Laboratory of Elemento-organic Chemistry, Nankai University , Tianjin 300071, China
| | - Chun-Jiang Wang
- College of Chemistry and Molecular Sciences, Wuhan University , Wuhan 430072, China.,State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry , Shanghai 230012, China
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49
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Zhao HW, Pang HL, Zhao YD, Liu YY, Zhao LJ, Chen XQ, Song XQ, Feng NN, Du J. Construction of 2,3,4,5-tetrahydro-1,2,4-triazines via [4 + 2] cycloaddition of α-halogeno hydrazones to imines. RSC Adv 2017. [DOI: 10.1039/c6ra27767e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
In the presence of sodium carbonate, the [4 + 2] cycloaddition of α-halogeno hydrazones to imines proceeded readily, and furnished 2,3,4,5-tetrahydro-1,2,4-triazines in moderate to high chemical yields.
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Affiliation(s)
- Hong-Wu Zhao
- College of Life Science and Bio-engineering
- Beijing University of Technology
- Beijing 100124
- P. R. China
| | - Hai-Liang Pang
- College of Life Science and Bio-engineering
- Beijing University of Technology
- Beijing 100124
- P. R. China
| | - Yu-Di Zhao
- College of Life Science and Bio-engineering
- Beijing University of Technology
- Beijing 100124
- P. R. China
| | - Yue-Yang Liu
- College of Life Science and Bio-engineering
- Beijing University of Technology
- Beijing 100124
- P. R. China
| | - Li-Jiao Zhao
- College of Life Science and Bio-engineering
- Beijing University of Technology
- Beijing 100124
- P. R. China
| | - Xiao-Qin Chen
- College of Life Science and Bio-engineering
- Beijing University of Technology
- Beijing 100124
- P. R. China
| | - Xiu-Qing Song
- College of Life Science and Bio-engineering
- Beijing University of Technology
- Beijing 100124
- P. R. China
| | - Ning-Ning Feng
- College of Life Science and Bio-engineering
- Beijing University of Technology
- Beijing 100124
- P. R. China
| | - Juan Du
- College of Life Science and Bio-engineering
- Beijing University of Technology
- Beijing 100124
- P. R. China
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50
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Chen DZ, Xiao WJ, Chen JR. Synthesis of spiropyrazoline oxindoles by a formal [4 + 1] annulation reaction between 3-bromooxindoles and in situ-derived 1,2-diaza-1,3-dienes. Org Chem Front 2017. [DOI: 10.1039/c7qo00163k] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A formal [4 + 1] annulation reaction of 3-bromooxindoles and in situ-derived 1,2-diaza-1,3-dienes has been developed to provide an efficient route to various spiropyrazoline oxindoles with high yields.
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Affiliation(s)
- Dong-Zhen Chen
- Key Laboratory of Pesticide & Chemical Biology
- Ministry of Education
- College of Chemistry
- Central China Normal University
- Wuhan
| | - Wen-Jing Xiao
- Key Laboratory of Pesticide & Chemical Biology
- Ministry of Education
- College of Chemistry
- Central China Normal University
- Wuhan
| | - Jia-Rong Chen
- Key Laboratory of Pesticide & Chemical Biology
- Ministry of Education
- College of Chemistry
- Central China Normal University
- Wuhan
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