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Suman P, Tomar K, Nishad CS, Banerjee B. Metal-free synthesis of carbamoylated dihydroquinolinones via cascade radical annulation of cinnamamides with oxamic acids. Org Biomol Chem 2024; 22:1821-1833. [PMID: 38332745 DOI: 10.1039/d3ob01856c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2024]
Abstract
We report a metal-free procedure for the sustainable synthesis of carbamoylated dihydroquinolinones via tandem addition-cyclization of carbamoyl radicals to cinnamamides. Readily accessible, non-toxic and inexpensive oxamic acids are used as carbamoyl radical precursors. This highly straightforward method provides a mild and environmentally friendly route showing good atom economy and excellent functional group tolerance to obtain diverse medicinally important carbamoylated dihydroquinolinones in one pot. The cascade cyclization is also modular and step-economical with a wide substrate scope and the products were obtained in good to excellent yields. Additionally, the tolerance to air and water, operational simplicity, low cost and scalability enhance the practical value of the proposed synthetic strategy. Preliminary mechanistic studies reveal that cheap and environment-friendly ammonium persulfate acts as a radical initiator in the cascade process and generates carbamoyl radicals from oxamic acids. The synthetic utility of this method is further demonstrated by late stage functionalization of drug molecules with good yields.
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Affiliation(s)
- Pallav Suman
- Department of Chemistry, Central University of Punjab, Bathinda-151401, India.
| | - Kirti Tomar
- Department of Chemistry, Central University of Punjab, Bathinda-151401, India.
| | | | - Biplab Banerjee
- Department of Chemistry, Central University of Punjab, Bathinda-151401, India.
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Vijayakumar A, Manod M, Krishna RB, Mathew A, Mohan C. Diversely functionalized isoquinolines and their core-embedded heterocyclic frameworks: a privileged scaffold for medicinal chemistry. RSC Med Chem 2023; 14:2509-2534. [PMID: 38107174 PMCID: PMC10718595 DOI: 10.1039/d3md00248a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Accepted: 08/23/2023] [Indexed: 12/19/2023] Open
Abstract
Isoquinoline-enrooted organic small-molecules represent a challenging molecular target in the organic synthesis arsenal attributed to their structural diversity and therapeutic importance. Into the bargain, isoquinolines are significant structural frameworks in modern medicinal chemistry and drug development. Consequently, synthetic organic and medicinal chemists have been intensely interested in efficient synthetic tactics for the sustainable construction of isoquinoline frameworks and their derivatives in enantiopure or racemic forms. This review accentuates an overview of the literature on the modern synthetic approaches exploited in synthesising isoquinolines and their core embedded heterocyclic skeletons from 2021 to 2022. In detail, the methodologies and inspected pharmacological studies for the array of diversely functionalized isoquinolines or their core-embedded heterocyclic/carbocyclic structures involving the introduction of substituents at C-1, C-3, and C-4 carbon and N-2 atom, bond constructions at the C1-N2 atom and C3-N2 atom, and structural scaffolding within isoquinoline compounds have been reviewed. This intensive study highlights the need for and relevance of relatively unexplored bioisosterism employing isoquinoline-based small-molecules in drug design.
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Affiliation(s)
- Archana Vijayakumar
- School of Chemical Sciences, Mahatma Gandhi University Kottayam 686560 India
| | - M Manod
- School of Chemical Sciences, Mahatma Gandhi University Kottayam 686560 India
| | - R Bharath Krishna
- Institute for Integrated Programmes and Research in Basic Sciences, Mahatma Gandhi University Kottayam 686560 India
| | - Abra Mathew
- School of Chemical Sciences, Mahatma Gandhi University Kottayam 686560 India
- Department of Chemistry, Indian Institute of Technology Palakkad Kerala 678577 India
| | - Chithra Mohan
- School of Chemical Sciences, Mahatma Gandhi University Kottayam 686560 India
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Tang Y, Duan J, Yang B, He Y, Du C, Zhang X. Visible-light-promoted organic-dye-catalyzed sulfonylation/cyclization to access indolo[2,1- a]isoquinoline derivatives. Org Biomol Chem 2023; 21:8152-8161. [PMID: 37781749 DOI: 10.1039/d3ob01289a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/03/2023]
Abstract
An efficient visible-light-promoted organic-dye-catalyzed radical cascade cyclization was developed for the rapid synthesis of sulfonyl-substituted indolo[2,1-a]isoquinolines and benzimidazo[2,1-a]isoquinolin-6(5H)-ones. Using the economical and environmentally benign Eosin B as the photocatalyst, a wide range of indolo[2,1-a]isoquinoline derivatives were obtained in moderate to good yields. Mechanistic studies indicate that a sulfonyl radical pathway is involved in this reaction. Compared with previous works, this protocol has the advantages of being metal- and base-free, using visible light as a traceless energy source, simple operation and mild reaction conditions, all of which make this methodology more attractive.
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Affiliation(s)
- Yucai Tang
- College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Engineering Technology Research Center of Key Preparation Technology of Biomedical Polymer Materials, Changde 415000, China.
| | - Jinglin Duan
- College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Engineering Technology Research Center of Key Preparation Technology of Biomedical Polymer Materials, Changde 415000, China.
| | - Biyu Yang
- College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Engineering Technology Research Center of Key Preparation Technology of Biomedical Polymer Materials, Changde 415000, China.
| | - Yupeng He
- College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Engineering Technology Research Center of Key Preparation Technology of Biomedical Polymer Materials, Changde 415000, China.
| | - Changyuan Du
- College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Engineering Technology Research Center of Key Preparation Technology of Biomedical Polymer Materials, Changde 415000, China.
| | - Xiangyang Zhang
- College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Engineering Technology Research Center of Key Preparation Technology of Biomedical Polymer Materials, Changde 415000, China.
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Tang Y, Yang Y, Zhou Q, Duan J, Yang B, Du C, He Y. Metal- and additive-free radical-triggered nitration/cyclization to construct indolo[2,1- α]isoquinoline and benzimidazo[2,1- a]isoquinolin-6(5 H)-one derivatives using t-BuONO as nitro reagents. Org Biomol Chem 2023. [PMID: 37309208 DOI: 10.1039/d3ob00630a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
An efficient metal- and additive-free nitro radical-triggered addition/cyclization of 2-aryl-N-acryloyl indoles/2-arylbenzimidazoles for the synthesis of nitro-substituted indolo[2,1-α]isoquinoline and benzimidazo[2,1-a]isoquinolin-6(5H)-one derivatives has been developed. The commercially available and low-cost t-BuONO was used as a nitro reagent. Due to mild reaction conditions, a variety of functional groups could be tolerated to give the corresponding products in moderate to good yields. Moreover, this nitration process could be scaled-up and the nitro group could be readily converted into the amino group, which may find applications in synthetic and medicinal chemistry.
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Affiliation(s)
- Yucai Tang
- College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Hunan Provincial Key Laboratory of Water Treatment Functional Materials, Hunan Province Engineering Research Center of Electroplating Wastewater Reuse Technology, Changde 415000, China.
| | - Yiting Yang
- College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Hunan Provincial Key Laboratory of Water Treatment Functional Materials, Hunan Province Engineering Research Center of Electroplating Wastewater Reuse Technology, Changde 415000, China.
| | - Qian Zhou
- College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Hunan Provincial Key Laboratory of Water Treatment Functional Materials, Hunan Province Engineering Research Center of Electroplating Wastewater Reuse Technology, Changde 415000, China.
| | - Jinglin Duan
- College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Hunan Provincial Key Laboratory of Water Treatment Functional Materials, Hunan Province Engineering Research Center of Electroplating Wastewater Reuse Technology, Changde 415000, China.
| | - Biyu Yang
- College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Hunan Provincial Key Laboratory of Water Treatment Functional Materials, Hunan Province Engineering Research Center of Electroplating Wastewater Reuse Technology, Changde 415000, China.
| | - Changyuan Du
- College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Hunan Provincial Key Laboratory of Water Treatment Functional Materials, Hunan Province Engineering Research Center of Electroplating Wastewater Reuse Technology, Changde 415000, China.
| | - Yupeng He
- College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Hunan Provincial Key Laboratory of Water Treatment Functional Materials, Hunan Province Engineering Research Center of Electroplating Wastewater Reuse Technology, Changde 415000, China.
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Sui K, Leng Y, Wu Y. Synthesis of Difluoroarymethyl-Substituted Benzimidazo[2,1- a]isoquinolin-6(5 H)-ones under Mild Conditions. ACS OMEGA 2023; 8:7517-7528. [PMID: 36872989 PMCID: PMC9979369 DOI: 10.1021/acsomega.2c06689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Accepted: 01/26/2023] [Indexed: 06/18/2023]
Abstract
A highly efficient method for synthesis of difluoroarymethyl-substituted benzimidazo[2,1-a]isoquinolin-6(5H)-ones using 2-arylbenzoimidazoles with α,α-difluorophenylacetic acid as reaction substrates has been developed through radical cascade cyclization. The advantage of this strategy lies in excellent functional group tolerance to generate the corresponding products in good yields under base- and metal-free conditions.
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Liu Y, Ding S, Xu M, Xu J, Cheng D, Wang H, Xu X. Synthesis of arylacylated oxindoles via visible light‐promoted Smiles rearrangement. ChemistrySelect 2022. [DOI: 10.1002/slct.202202563] [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]
Affiliation(s)
- Yihuo Liu
- College of Chemical Engineering Zhejiang University of Technology Hangzhou 310014 P. R. China
| | - Siyu Ding
- College of Chemical Engineering Zhejiang University of Technology Hangzhou 310014 P. R. China
| | - Mingli Xu
- College of Chemical Engineering Zhejiang University of Technology Hangzhou 310014 P. R. China
| | - Jinli Xu
- College of Chemical Engineering Zhejiang University of Technology Hangzhou 310014 P. R. China
| | - Dongping Cheng
- College of Pharmaceutical Sciences Zhejiang University of Technology Hangzhou 310014 P. R. China
| | - Hong Wang
- College of Chemical Engineering Zhejiang University of Technology Hangzhou 310014 P. R. China
| | - Xiaoliang Xu
- College of Chemical Engineering Zhejiang University of Technology Hangzhou 310014 P. R. China
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pan Y, Xu J, Zhang H, Hao R, Shen Z, Huang W. The Synthesis of 5,6‐dihydrobenzo[4,5]imidazo[2,1‐a]isoquinoline Derivatives via Metal‐free Radical Cascade Pathway. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200571] [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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Tang Y, Dai K, Xiang X, Yang Y, Li M. Synthesis of ester-functionalized indolo[2,1- a]isoquinolines via iron-catalyzed radical cascade cyclization of 2-aryl- N-acryloyl indoles with carbazates. Org Biomol Chem 2022; 20:5704-5711. [PMID: 35838169 DOI: 10.1039/d2ob00934j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
An FeCl2·4H2O-catalyzed oxidative alkoxycarbonylation/cyclization reaction of 2-aryl-N-acryloyl indoles with carbazates leading to ester-functionalized indolo[2,1-a]isoquinoline derivatives has been developed. The reaction features mild reaction conditions and broad functional group tolerance. Moreover, the ester group could be easily converted to the corresponding free acid and alcohol, and has high potential applications in organic and pharmaceutical synthesis. A radical pathway was proposed to explain this experiment.
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Affiliation(s)
- Yucai Tang
- College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Hunan Provincial Key Laboratory of Water Treatment Functional Materials, Hunan Province Engineering Research Center of Electroplating Wastewater Reuse Technology, Changde 415000, China.
| | - Kaiming Dai
- College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Hunan Provincial Key Laboratory of Water Treatment Functional Materials, Hunan Province Engineering Research Center of Electroplating Wastewater Reuse Technology, Changde 415000, China.
| | - Xingxian Xiang
- College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Hunan Provincial Key Laboratory of Water Treatment Functional Materials, Hunan Province Engineering Research Center of Electroplating Wastewater Reuse Technology, Changde 415000, China.
| | - Yiting Yang
- College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Hunan Provincial Key Laboratory of Water Treatment Functional Materials, Hunan Province Engineering Research Center of Electroplating Wastewater Reuse Technology, Changde 415000, China.
| | - Min Li
- College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Hunan Provincial Key Laboratory of Water Treatment Functional Materials, Hunan Province Engineering Research Center of Electroplating Wastewater Reuse Technology, Changde 415000, China.
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Zhang J, Yang Z, Yu JT, Pan C. Three-component synthesis of arylsulfonyl-substituted indolo[2,1- a]isoquinolinones and benzimidazo-[2,1- a]isoquinolin-6(5 H)-ones by SO 2 insertion and radical cascade cyclization. Org Biomol Chem 2022; 20:3067-3071. [PMID: 35348170 DOI: 10.1039/d2ob00409g] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
An efficient arylsulfonylation/cyclization of 2-aryl-N-methacryloyl indoles with potassium metabisulfite and aryldiazonium tetrafluoroborates was developed. A series of variously substituted arylsulfonyl indolo[2,1-a]isoquinolin-6(5H)-ones were formed in moderate to good yields via utilization of the nature abundant inorganic salt potassium metabisulfite as a SO2 surrogate. Additionally, this three-component protocol can also be employed for the synthesis of arylsulfonyl-substituted benzimidazo-[2,1-a]isoquinolin-6(5H)-ones.
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Affiliation(s)
- Jie Zhang
- School of Petrochemical Engineering, Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, Changzhou University, Changzhou 213164, P. R. China.
| | - Zixian Yang
- School of Petrochemical Engineering, Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, Changzhou University, Changzhou 213164, P. R. China.
| | - Jin-Tao Yu
- School of Petrochemical Engineering, Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, Changzhou University, Changzhou 213164, P. R. China.
| | - Changduo Pan
- School of Chemical and Environmental Engineering, Jiangsu University of Technology, Changzhou 213001, P. R. China
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Yechun W, Jintao Y. Recent Advances in the Decarboxylative Acylation/Cyclization of α-Keto Acids. CHINESE J ORG CHEM 2022. [DOI: 10.6023/cjoc202205025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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