101
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Iškauskienė M, Ragaitė G, Sløk FA, Šačkus A. Facile synthesis of novel amino acid-like building blocks by N-alkylation of heterocyclic carboxylates with N-Boc-3-iodoazetidine. Mol Divers 2019; 24:1235-1251. [PMID: 31420788 DOI: 10.1007/s11030-019-09987-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Accepted: 08/08/2019] [Indexed: 01/11/2023]
Abstract
An efficient protocol providing easy access to highly functionalized heterocyclic compounds as novel organic building blocks was developed by coupling alkyl pyrazole-, indazole- and indolecarboxylates with N-Boc-3-iodoazetidine. The synthesized compounds are representatives of constrained non-chiral synthetic azole carboxylates in their N-Boc protected ester forms. Diversification of the prepared heterocyclic building blocks was achieved via application of palladium-catalyzed Suzuki-Miyaura cross-coupling reactions. In total, 34 building blocks were obtained to form a highly diversified small molecule collection. The structure of the novel heterocyclic compounds was investigated and verified by advanced NMR spectroscopy methods.
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Affiliation(s)
- Monika Iškauskienė
- Department of Organic Chemistry, Kaunas University of Technology, Radvilėnų pl. 19, 50254, Kaunas, Lithuania. .,Institute of Synthetic Chemistry, Kaunas University of Technology, K. Baršausko g. 59, 51423, Kaunas, Lithuania.
| | - Greta Ragaitė
- Institute of Synthetic Chemistry, Kaunas University of Technology, K. Baršausko g. 59, 51423, Kaunas, Lithuania
| | - Frank A Sløk
- Vipergen ApS, Gammel Kongevej 23A, 1610, Copenhagen V, Denmark
| | - Algirdas Šačkus
- Department of Organic Chemistry, Kaunas University of Technology, Radvilėnų pl. 19, 50254, Kaunas, Lithuania.,Institute of Synthetic Chemistry, Kaunas University of Technology, K. Baršausko g. 59, 51423, Kaunas, Lithuania
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102
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Kondo M, Takizawa S, Jiang Y, Sasai H. Room-Temperature, Metal-Free, and One-Pot Preparation of 2H-Indazoles through a Mills Reaction and Cyclization Sequence. Chemistry 2019; 25:9866-9869. [PMID: 31150138 DOI: 10.1002/chem.201902242] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Indexed: 11/05/2022]
Abstract
The Mills reaction and cyclization of readily available 2-aminobenzyl alcohols and nitrosobenzenes using thionyl bromide provided 2H-indazoles in up to 88 % yields. In the metal-free process, acetic acid played a crucial role for the both Mills reaction and cyclization. A brominated 2H-indazole could also be obtained through the one-pot sequence.
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Affiliation(s)
- Masaru Kondo
- The Institute of Scientific and Industrial Research (ISIR), Osaka University, Mihogaoka, Ibaraki-shi, Osaka, 567-0047, Japan
| | - Shinobu Takizawa
- The Institute of Scientific and Industrial Research (ISIR), Osaka University, Mihogaoka, Ibaraki-shi, Osaka, 567-0047, Japan.,Artificial Intelligence Research Center, ISIR, Osaka University, Osaka, 567-0047, Japan
| | - Yuzhao Jiang
- The Institute of Scientific and Industrial Research (ISIR), Osaka University, Mihogaoka, Ibaraki-shi, Osaka, 567-0047, Japan
| | - Hiroaki Sasai
- The Institute of Scientific and Industrial Research (ISIR), Osaka University, Mihogaoka, Ibaraki-shi, Osaka, 567-0047, Japan
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103
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Dai P, Tan X, Luo Q, Yu X, Zhang S, Liu F, Zhang WH. Synthesis of 3-Acyl-isoxazoles and Δ 2-Isoxazolines from Methyl Ketones, Alkynes or Alkenes, and tert-Butyl Nitrite via a Csp 3-H Radical Functionalization/Cycloaddition Cascade. Org Lett 2019; 21:5096-5100. [PMID: 31194561 DOI: 10.1021/acs.orglett.9b01683] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
A novel metal-free tandem Csp3-H bond functionalization of ketones and 1,3-dipolar cycloaddition has been developed. An efficient approach to a variety of oxazole and isoxazoline derivatives is demonstrated using the 1,3-dipolar cycloaddition of alkynes and alkenes to nitrile oxides generated by reactions of methyl ketones with tert-butyl nitrite. This new protocol provides access to a variety of isoxazolines with diverse functionalities. An isoxazole generated in this way was found to have significant antifungal activity.
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Affiliation(s)
- Peng Dai
- Jiangsu Key Laboratory of Pesticide Science , College of Sciences, Nanjing Agricultural University , Nanjing 210095 , China
| | - Xin Tan
- Jiangsu Key Laboratory of Pesticide Science , College of Sciences, Nanjing Agricultural University , Nanjing 210095 , China
| | - Qian Luo
- Jiangsu Key Laboratory of Pesticide Science , College of Sciences, Nanjing Agricultural University , Nanjing 210095 , China
| | - Xiang Yu
- Jiangsu Key Laboratory of Pesticide Science , College of Sciences, Nanjing Agricultural University , Nanjing 210095 , China
| | - Shuguang Zhang
- Jiangsu Key Laboratory of Pesticide Science , College of Sciences, Nanjing Agricultural University , Nanjing 210095 , China
| | - Fang Liu
- Jiangsu Key Laboratory of Pesticide Science , College of Sciences, Nanjing Agricultural University , Nanjing 210095 , China
| | - Wei-Hua Zhang
- Jiangsu Key Laboratory of Pesticide Science , College of Sciences, Nanjing Agricultural University , Nanjing 210095 , China
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104
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Murugan A, Babu VN, Polu A, Sabarinathan N, Bakthadoss M, Sharada DS. Regioselective C3-H Trifluoromethylation of 2 H-Indazole under Transition-Metal-Free Photoredox Catalysis. J Org Chem 2019; 84:7796-7803. [PMID: 31117559 DOI: 10.1021/acs.joc.9b00676] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Trifluoromethyl-substituted heteroarenes are biologically active compounds and useful building blocks. In this sequence, we have developed a visible-light-promoted regioselective C3-H trifluoromethylation of 2 H-indazole under metal-free conditions, which proceeds via a radical mechanism. The combination of photocatalysis and hypervalent iodine reagent provides a practical approach to a library of trifluoromethylated indazoles in 35-83% yields.
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Affiliation(s)
- Arumugavel Murugan
- Catalysis & Chemical Biology Laboratory, Department of Chemistry , Indian Institute of Technology Hyderabad , Kandi, 502285 Sangareddy , Telangana , India
| | - Venkata Nagarjuna Babu
- Catalysis & Chemical Biology Laboratory, Department of Chemistry , Indian Institute of Technology Hyderabad , Kandi, 502285 Sangareddy , Telangana , India
| | - Ashok Polu
- Catalysis & Chemical Biology Laboratory, Department of Chemistry , Indian Institute of Technology Hyderabad , Kandi, 502285 Sangareddy , Telangana , India
| | - Nagaraj Sabarinathan
- Catalysis & Chemical Biology Laboratory, Department of Chemistry , Indian Institute of Technology Hyderabad , Kandi, 502285 Sangareddy , Telangana , India
| | - Manickam Bakthadoss
- Department of Chemistry , Pondicherry University , Pondicherry 605014 , India
| | - Duddu S Sharada
- Catalysis & Chemical Biology Laboratory, Department of Chemistry , Indian Institute of Technology Hyderabad , Kandi, 502285 Sangareddy , Telangana , India
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105
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Marín-Luna M, Claramunt RM, Nieto CI, Alkorta I, Elguero J, Reviriego F. A theoretical NMR study of polymorphism in crystal structures of azoles and benzazoles. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2019; 57:275-284. [PMID: 30604430 DOI: 10.1002/mrc.4824] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Revised: 12/07/2018] [Accepted: 12/25/2018] [Indexed: 06/09/2023]
Abstract
The NMR chemical shifts of two azoles and one benzazole whose crystal structures present polymorphism have been computed using the GIPAW approach. 15 N and 13 C nuclei have been studied. Statistical analysis of the computed 13 C and 15 N chemical shifts indicates that the GIPAW chemical shifts reproduce with a high degree of accuracy those experimentally reported. This methodology can be used to identify other polymorphic crystal structures.
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Affiliation(s)
- Marta Marín-Luna
- Departamento de Química Orgánica, Universidad de Vigo, Vigo, 36310, Spain
| | - Rosa M Claramunt
- Departamento de Química Orgánica y Bio-Orgánica, Facultad de Ciencias, UNED, Paseo Senda del Rey, 9, Madrid, E-28040, Spain
| | - Carla I Nieto
- Departamento de Química Orgánica y Bio-Orgánica, Facultad de Ciencias, UNED, Paseo Senda del Rey, 9, Madrid, E-28040, Spain
| | - Ibon Alkorta
- Instituto de Química Médica, CSIC, Juan de la Cierva, 3, Madrid, E-28006, Spain
| | - José Elguero
- Instituto de Química Médica, CSIC, Juan de la Cierva, 3, Madrid, E-28006, Spain
| | - Felipe Reviriego
- Instituto de Ciencia y Tecnología de Polímeros, CSIC, Juan de la Cierva, 3, Madrid, E-28006, Spain
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106
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Nie HJ, Guo AD, Lin HX, Chen XH. Rapid and halide compatible synthesis of 2- N-substituted indazolone derivatives via photochemical cyclization in aqueous media. RSC Adv 2019; 9:13249-13253. [PMID: 35520758 PMCID: PMC9063774 DOI: 10.1039/c9ra02466b] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2019] [Accepted: 04/19/2019] [Indexed: 12/25/2022] Open
Abstract
A straightforward protocol for the rapid construction of privileged indazolone architectures suggests a new avenue of great importance to medicinal chemistry.
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Affiliation(s)
- Hui-Jun Nie
- Department of Chemistry
- Innovative Drug Research Center
- College of Sciences Shanghai University
- Shanghai
- China
| | - An-Di Guo
- Chinese Academy of Sciences Key Laboratory of Receptor Research
- Synthetic Organic & Medicinal Chemistry Laboratory
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203
| | - Hai-Xia Lin
- Department of Chemistry
- Innovative Drug Research Center
- College of Sciences Shanghai University
- Shanghai
- China
| | - Xiao-Hua Chen
- Chinese Academy of Sciences Key Laboratory of Receptor Research
- Synthetic Organic & Medicinal Chemistry Laboratory
- Shanghai Institute of Materia Medica
- Chinese Academy of Sciences
- Shanghai 201203
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107
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Eddahmi M, Moura NMM, Bouissane L, Gamouh A, Faustino MAF, Cavaleiro JAS, Paz FAA, Mendes RF, Lodeiro C, Santos SM, Neves MGPMS, Rakib EM. New nitroindazolylacetonitriles: efficient synthetic accessviavicarious nucleophilic substitution and tautomeric switching mediated by anions. NEW J CHEM 2019. [DOI: 10.1039/c9nj02807b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Efficient synthesis of newN-methylnitroindazolylacetonitriles and their ability to switch between tautomeric forms in the presence of anionic species.
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