1
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Han G, Zhang W, Acs E, Paquin A, Ronzon Q, Casaretto N, Nay B. Total Synthesis of Cyclotripeptidic Natural Products Anacine, Aurantiomide C, Polonimides A and C, and Verrucine F. Org Lett 2024; 26:2629-2634. [PMID: 38529937 DOI: 10.1021/acs.orglett.4c00658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/27/2024]
Abstract
The total synthesis of cyclotripeptidic natural products possessing a central piperazino[2,1-b]quinazolin-3,6-dione core is described through an original strategy involving the pivotal cyclocondensation of an electrophilic homoserine lactone intermediate. The alkylidene group was spontaneously installed by autoxidation during the cyclocondensation process, while the propionamide side chain was introduced through the nickel-catalyzed aminocarbonylation of a bromoethyl intermediate. This last reaction is unprecedented on such highly functionalized intermediates. Finally, we explored structural modifications and interconversions of the natural products. Overall, this work led to anacine, aurantiomide C, polonimides A and C, and verrucine F.
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Affiliation(s)
- Guanghui Han
- Laboratoire de Synthèse Organique, Ecole Polytechnique, ENSTA Paris, CNRS, Institut Polytechnique de Paris, Route de Saclay, 91128 Palaiseau Cedex, France
| | - Wei Zhang
- Laboratoire de Synthèse Organique, Ecole Polytechnique, ENSTA Paris, CNRS, Institut Polytechnique de Paris, Route de Saclay, 91128 Palaiseau Cedex, France
| | - Emmanuelle Acs
- Laboratoire de Synthèse Organique, Ecole Polytechnique, ENSTA Paris, CNRS, Institut Polytechnique de Paris, Route de Saclay, 91128 Palaiseau Cedex, France
| | - Alexis Paquin
- Laboratoire de Synthèse Organique, Ecole Polytechnique, ENSTA Paris, CNRS, Institut Polytechnique de Paris, Route de Saclay, 91128 Palaiseau Cedex, France
| | - Quentin Ronzon
- Laboratoire de Synthèse Organique, Ecole Polytechnique, ENSTA Paris, CNRS, Institut Polytechnique de Paris, Route de Saclay, 91128 Palaiseau Cedex, France
| | - Nicolas Casaretto
- Laboratoire de Chimie Moléculaire, Ecole Polytechnique, CNRS, Institut Polytechnique de Paris, Route de Saclay, 91128 Palaiseau Cedex, France
| | - Bastien Nay
- Laboratoire de Synthèse Organique, Ecole Polytechnique, ENSTA Paris, CNRS, Institut Polytechnique de Paris, Route de Saclay, 91128 Palaiseau Cedex, France
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2
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Zhu B, He J, Zou K, Li A, Zhang C, Zhao J, Cao H. Base-Catalyzed One-Pot Synthesis of 2,3,6-Substituted Pyridines. J Org Chem 2023; 88:11450-11459. [PMID: 37505995 DOI: 10.1021/acs.joc.3c00375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/30/2023]
Abstract
A three-component reaction catalyzed by base was established, which mainly consisted of ynals, isocyanates, amines and alcohols. This strategy provides a wide range of substrates and represents a simple process for the preparation of different pyridine derivatives in good yields with high regioselectivities.
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Affiliation(s)
- Baofu Zhu
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, P.R. China
| | - Jiaming He
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, P.R. China
| | - Kai Zou
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, P.R. China
| | - Anquan Li
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, P.R. China
| | - Chen Zhang
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, P.R. China
| | - Jiaji Zhao
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, P.R. China
| | - Hua Cao
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, P.R. China
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3
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Jiang W, Li Y, Liu JQ, Wang XS. Copper-Catalyzed Consecutive Ullmann, Decarboxylation, Oxidation, and Dehydration Reaction for Synthesis of Pyrrolo or Pyrido[1,2- a]imidazo[1,2- c]quinazolines. Org Lett 2023; 25:5123-5127. [PMID: 37382582 DOI: 10.1021/acs.orglett.3c01873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/30/2023]
Abstract
A protocol for a copper-catalyzed intermolecular cross-coupling cascade between 2-(2-bromoaryl)-1H-benzo[d]imidazole analogues and proline or pipecolic acid has been developed. The developed protocol allows access to a variety of synthetically useful N-fused pyrrolo or pyrido[1,2-a]imidazo[1,2-c]quinazoline scaffolds with high efficiency and good functional group compatibility. Proline or pipecolic acid plays a dual role in the reaction: as ligand and reactants. A mechanistically consecutive approach for the Ullmann coupling, decarboxylation, oxidation, and dehydration reaction process was presented.
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Affiliation(s)
- Weidong Jiang
- School of Chemistry and Materials Science, Jiangsu Key Laboratory of Green Synthesis for Functional Materials, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China
| | - Ye Li
- School of Chemistry and Materials Science, Jiangsu Key Laboratory of Green Synthesis for Functional Materials, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China
| | - Jian-Quan Liu
- School of Chemistry and Materials Science, Jiangsu Key Laboratory of Green Synthesis for Functional Materials, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China
| | - Xiang-Shan Wang
- School of Chemistry and Materials Science, Jiangsu Key Laboratory of Green Synthesis for Functional Materials, Jiangsu Normal University, Xuzhou, Jiangsu 221116, China
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4
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Liu LQ, Fang YL, Lin JX, Wang YC. Aerobic Copper-Catalyzed Four-Component Reaction of O-Phenylenediamines, Isocyanides, and Selenium Powder for the Assembly of Benzo[4,5]imidazo[2,1- c][1,2,4]selenadiazol-3-imine Derivatives. J Org Chem 2022; 87:15120-15128. [DOI: 10.1021/acs.joc.2c01622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Li-Qiu Liu
- College of Chemistry and Chemical Engineering, Hunan Engineering Laboratory for Analyse and Drugs Development of Ethnomedicine in Wuling Mountains, Jishou University, Jishou 416000, People’s Republic of China
| | - Yi-Ling Fang
- Department of Chemistry and Pharmacy Guilin Normal College, Gulin 541199, People’s Republic of China
| | - Jun-Xu Lin
- College of Chemistry and Chemical Engineering, Hunan Engineering Laboratory for Analyse and Drugs Development of Ethnomedicine in Wuling Mountains, Jishou University, Jishou 416000, People’s Republic of China
| | - Ying-Chun Wang
- College of Chemistry and Chemical Engineering, Hunan Engineering Laboratory for Analyse and Drugs Development of Ethnomedicine in Wuling Mountains, Jishou University, Jishou 416000, People’s Republic of China
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5
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Luo J, Wan J, Wu L, Yang L, Wang T. tert-Butyl Hydroperoxide Promoted the Reaction of Quinazoline-3-oxides with Primary Amines Affording Quinazolin-4(3 H)-ones. J Org Chem 2022; 87:9864-9874. [PMID: 35834782 DOI: 10.1021/acs.joc.2c00898] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient and facile approach for the synthesis of quinazolin-4(3H)-ones via the reaction of quinazoline-3-oxides with primary amines is described. This approach is demonstrated to be applicable for a broad range of substrates and proceeds efficiently under metal-free and mild reaction conditions employing easily available tert-butyl hydroperoxide as the oxidant. Remarkably, 3-(2-(1H-indol-3-yl) ethyl)quinazolin-4(3H)-one 3w, which was conveniently obtained by this process in 70% yield, was an excellent precursor for the synthesis of bioactive evodiamine and rutaempine.
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Affiliation(s)
- Jin Luo
- Analytical and Testing Center, Jiangxi Normal University, Nanchang, Jiangxi 330022, P. R. China
| | - Juelin Wan
- Jiangxi Province Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, P. R. China
| | - Lianlian Wu
- Jiangxi Province Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, P. R. China
| | - Lingyun Yang
- Jiangxi Province Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, P. R. China
| | - Tao Wang
- Jiangxi Province Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, P. R. China
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6
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DMSO as C1 source under metal‐and oxidant‐free conditions: NH4SCN mediated synthesis of quinazolinone and dihydroquinazolin‐4(1H)‐one derivatives. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200274] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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7
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Wu F, Dong W, Fan S, Yuan Y, Liang C, Chen A, Yin Z, Zhang Z. Rapid Synthesis of Luotonin A Derivatives via Synergistic Visible-Light Photoredox and Acid Catalysis. J Org Chem 2022; 87:1302-1312. [PMID: 35014842 DOI: 10.1021/acs.joc.1c02617] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The merging of visible-light photoredox and acid catalysis allowed for an intramolecular Povarov cycloaddition reaction using eosin Y as the photocatalyst and TsOH·H2O as the co-catalyst. A visible-light-promoted dehydrogenative cyclization protocol enabled the construction of Luotonin A derivatives with up to 97% yield.
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Affiliation(s)
- Feng Wu
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China.,Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Wuheng Dong
- Medicine Center, Guangxi University of Science and Technology, Liuzhou, Guangxi 545006, China
| | - Sijie Fan
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
| | - Yao Yuan
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
| | - Caiyun Liang
- Medicine Center, Guangxi University of Science and Technology, Liuzhou, Guangxi 545006, China
| | - Aiyu Chen
- Medicine Center, Guangxi University of Science and Technology, Liuzhou, Guangxi 545006, China
| | - Zuodong Yin
- Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China
| | - Zhaoguo Zhang
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
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8
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Diaryliodonium salt as oxidant in sp3 C-H activation and synthesis of quinazolin-4(3H)-ones. RESULTS IN CHEMISTRY 2022. [DOI: 10.1016/j.rechem.2021.100270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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9
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A Facile Synthesis of Indole Derivatives by a Palladium‐Catalyzed Process Initiated from Ugi Adducts and their Antifungal Activities. ChemistrySelect 2021. [DOI: 10.1002/slct.202104070] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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10
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One-pot synthesis of polysubstituted quinazolin-4(3H)-ones via sequential oxidative Ugi/Staudinger/aza-Wittig reactions starting from tertiary amines. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132368] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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11
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Meng X, Wu D, Zhang Y, Zhao Y. PPTS‐Catalyzed Bicyclization Reaction of 2‐Isocyanobenzaldehydes with Various Amines: Synthesis of Diverse Fused Quinazolines. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202001512] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xiang‐He Meng
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis Faculty of Chemistry Northeast Normal University Changchun 130024 People's Republic of China
| | - Dan‐Ni Wu
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis Faculty of Chemistry Northeast Normal University Changchun 130024 People's Republic of China
| | - Yu‐Jia Zhang
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis Faculty of Chemistry Northeast Normal University Changchun 130024 People's Republic of China
| | - Yu‐Long Zhao
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis Faculty of Chemistry Northeast Normal University Changchun 130024 People's Republic of China
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12
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Wang L, Zhang Y, Chen Z, Wu X. Palladium‐Catalyzed Carbonylative Synthesis of 2‐(Trifluoromethyl)quinazolin‐4(3
H
)‐ones from Trifluoroacetimidoyl Chlorides and Nitro Compounds. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202001502] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Le‐Cheng Wang
- Department of Chemistry Zhejiang Sci-Tech University Hangzhou 310018 People's Republic of China
| | - Yu Zhang
- Department of Chemistry Zhejiang Sci-Tech University Hangzhou 310018 People's Republic of China
| | - Zhengkai Chen
- Department of Chemistry Zhejiang Sci-Tech University Hangzhou 310018 People's Republic of China
| | - Xiao‐Feng Wu
- Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences 116023 Dalian Liaoning People's Republic of China
- Leibniz-Institut für Katalyse e. V. an der Universität Rostock Albert-Einstein-Straße 29a 18059 Rostock Germany
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13
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Chen W, Liu M, Li HJ, Wu YC. Switchable and efficient conversion of 2-amido-aryl oxazolines to quinazolin-4(3 H)-ones and N-(2-chloroethyl)benzamides. Org Chem Front 2021. [DOI: 10.1039/d0qo01368d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Switchable chemoselective conversion of 2-amido-aryl oxazolines to quinazolin-4(3H)-ones or N-(2-chloroethyl)benzamides is achieved.
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Affiliation(s)
- Weiqiang Chen
- School of Marine Science and Technology
- Weihai Marine Organism & Medical Technology Research Institute
- Harbin Institute of Technology
- Weihai 264209
- P. R. China
| | - Mei Liu
- China Building Material Test & Certification Group Zibo Co
- Ltd
- Zibo 255000
- P. R. China
| | - Hui-Jing Li
- School of Marine Science and Technology
- Weihai Marine Organism & Medical Technology Research Institute
- Harbin Institute of Technology
- Weihai 264209
- P. R. China
| | - Yan-Chao Wu
- School of Marine Science and Technology
- Weihai Marine Organism & Medical Technology Research Institute
- Harbin Institute of Technology
- Weihai 264209
- P. R. China
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14
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Zhang J, Xu W, Qu Y, Liu Y, Li Y, Song H, Wang Q. Visible-light-induced radical isocyanide insertion protocol for the synthesis of difluoromethylated spiro[indole-3,3'-quinoline] derivatives. Chem Commun (Camb) 2020; 56:15212-15215. [PMID: 33227101 DOI: 10.1039/d0cc06645a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Herein, we report the first protocol for visible-light-induced radical isocyanide insertion reactions between 3-(2-isocyanobenzyl)-indoles and bromodifluoroacetates or bromodifluoroacetamides. The protocol, which has good functional group tolerance and a broad substrate scope, constitutes an efficient and general route to difluoromethylated spiro[indole-3,3'-quinoline] derivatives.
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Affiliation(s)
- Jingjing Zhang
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Nankai University, Tianjin 300071, People's Republic of China.
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15
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Haibach MC, Ickes AR, Wilders AM, Shekhar S. Recent Advances in Nonprecious Metal Catalysis. Org Process Res Dev 2020. [DOI: 10.1021/acs.oprd.0c00367] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Michael C. Haibach
- Process Research and Development, AbbVie Inc., 1 North Waukegan Road, North Chicago, Illinois 60064, United States
| | - Andrew R. Ickes
- Process Research and Development, AbbVie Inc., 1 North Waukegan Road, North Chicago, Illinois 60064, United States
| | - Alison M. Wilders
- Process Research and Development, AbbVie Inc., 1 North Waukegan Road, North Chicago, Illinois 60064, United States
| | - Shashank Shekhar
- Process Research and Development, AbbVie Inc., 1 North Waukegan Road, North Chicago, Illinois 60064, United States
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16
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Viji M, Vishwanath M, Sim J, Park Y, Jung C, Lee S, Lee H, Lee K, Jung JK. α-Hydroxy acid as an aldehyde surrogate: metal-free synthesis of pyrrolo[1,2- a]quinoxalines, quinazolinones, and other N-heterocycles via decarboxylative oxidative annulation reaction. RSC Adv 2020; 10:37202-37208. [PMID: 35521290 PMCID: PMC9057147 DOI: 10.1039/d0ra07093a] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Accepted: 10/04/2020] [Indexed: 01/18/2023] Open
Abstract
A metal-free and efficient procedure for the synthesis of pyrrolo[1,2-a]quinoxalines, quinazolinones, and indolo[1,2-a]quinoxaline has been developed. The key features of our method include the in situ generation of aldehyde from α-hydroxy acid in the presence of TBHP (tert-butyl hydrogen peroxide), and further condensation with various amines, followed by intramolecular cyclization and subsequent oxidation to afford the corresponding quinoxalines, quinazolinones derivatives in moderate to high yields.
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Affiliation(s)
- Mayavan Viji
- College of Pharmacy, Medicinal Research Center (MRC), Chungbuk National University Cheongju 28160 Republic of Korea +82-43-268-2732 +82-43-261-2635
| | - Manjunatha Vishwanath
- College of Pharmacy, Medicinal Research Center (MRC), Chungbuk National University Cheongju 28160 Republic of Korea +82-43-268-2732 +82-43-261-2635
| | - Jaeuk Sim
- College of Pharmacy, Medicinal Research Center (MRC), Chungbuk National University Cheongju 28160 Republic of Korea +82-43-268-2732 +82-43-261-2635
| | - Yunjeong Park
- College of Pharmacy, Medicinal Research Center (MRC), Chungbuk National University Cheongju 28160 Republic of Korea +82-43-268-2732 +82-43-261-2635
| | - Chanhyun Jung
- College of Pharmacy, Medicinal Research Center (MRC), Chungbuk National University Cheongju 28160 Republic of Korea +82-43-268-2732 +82-43-261-2635
| | - Seohu Lee
- College of Pharmacy, Medicinal Research Center (MRC), Chungbuk National University Cheongju 28160 Republic of Korea +82-43-268-2732 +82-43-261-2635
| | - Heesoon Lee
- College of Pharmacy, Medicinal Research Center (MRC), Chungbuk National University Cheongju 28160 Republic of Korea +82-43-268-2732 +82-43-261-2635
| | - Kiho Lee
- College of Pharmacy, Korea University Sejong 30019 Republic of Korea
| | - Jae-Kyung Jung
- College of Pharmacy, Medicinal Research Center (MRC), Chungbuk National University Cheongju 28160 Republic of Korea +82-43-268-2732 +82-43-261-2635
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17
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Gujjarappa R, Vodnala N, Reddy VG, Malakar CC. A Facile C‐H Insertion Strategy using Combination of HFIP and Isocyanides: Metal‐Free Access to Azole Derivatives. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.202000481] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Raghuram Gujjarappa
- Department of Chemistry National Institute of Technology Manipur, Langol Imphal 795004, Manipur India
| | - Nagaraju Vodnala
- Department of Chemistry National Institute of Technology Manipur, Langol Imphal 795004, Manipur India
| | - Velma Ganga Reddy
- Centre for Advanced Materials & Industrial Chemistry (CAMIC) School of Science RMIT University GPO Box 2476 Melbourne 3001 Australia
| | - Chandi C. Malakar
- Department of Chemistry National Institute of Technology Manipur, Langol Imphal 795004, Manipur India
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