1
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Young HA, Proulx C. On-resin Cα-functionalization of N-arylglycinyl peptides with boronic acids. Org Biomol Chem 2022; 20:6245-6249. [PMID: 35616496 DOI: 10.1039/d2ob00524g] [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 late-stage α-C-H functionalization reaction of resin-bound, electron-rich N-aryl peptides with boronic acid nucleophiles under mild conditions is reported. We explore the impact of the N-arylglycinyl peptide structure on reactivity, and present a scope of the optimized reaction where both the peptide sequence and nature of boronic acid derivatives are varied.
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Affiliation(s)
- Hailey A Young
- Department of Chemistry, North Carolina State University, Raleigh, NC 27695-8204, USA.
| | - Caroline Proulx
- Department of Chemistry, North Carolina State University, Raleigh, NC 27695-8204, USA.
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2
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Battula S, Desai AA, Soni JY, Mehta DP. Accessing Grignard Reluctant Aldehyde in 2-Oxoaldehyde by Organocuprates to Give [1,2] Addition and Oxidative Coupling Reactions. ACS OMEGA 2022; 7:5069-5078. [PMID: 35187323 PMCID: PMC8851654 DOI: 10.1021/acsomega.1c06031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/28/2021] [Accepted: 01/20/2022] [Indexed: 06/14/2023]
Abstract
Novel finding of aldehyde in 2-oxoaldehyde (2OA) is presented as it unprecedentedly disinclines to react with Grignard reagents but reacts with moderate organocuprate reagents in anaerobic condition to give [1,2] addition (α-hydroxyketones) reaction. In the presence of air, the reaction produces an efficient protocol for the synthesis of 1,2-diones through a copper-catalyzed oxidative cross-coupling reaction at room temperature. Mechanistic studies indicate that α-hydroxy ketone perhaps is generated before the hydrolysis step/acid work-up process. The α-keto group of 2OA causes to exhibit this peculiar aldehyde behavior toward these organometallic reagents.
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Affiliation(s)
- Satyanarayana Battula
- Tarsadia
Institute of Chemical Sciences, Uka Tarsadia
University, Bardoli, Gujarat 394350, India
| | - Aman A. Desai
- Aether
Industries Pvt. Ltd., Sachin, Surat, Gujarat 394230, India
| | - Jigar Y. Soni
- Department
of Chemistry, Madhav University, Abu Road, Sirohi, Rajasthan 307026, India
| | - Dhruv P. Mehta
- Aether
Industries Pvt. Ltd., Sachin, Surat, Gujarat 394230, India
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3
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Liang J, Fu Y, Bao X, Ou L, Sang T, Yuan Y, Huo C. Cyanation of glycine derivatives. Chem Commun (Camb) 2021; 57:3014-3017. [PMID: 33623936 DOI: 10.1039/d0cc08126d] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
We report a catalytic oxidative C-H cyanation of glycine derivatives using a simple copper(i) catalyst with NFSI as an oxidant via a radical process to furnish α-cyano glycine derivatives, which are useful intermediates for organic synthesis. CuCl acted as both a one-electron reductant and a transition-metal catalyst in this transformation. NFSI served as a one-electron oxidant and generated a N-centered radical as a H-abstractor. The reaction displayed broad substrate scope and mild reaction conditions.
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Affiliation(s)
- Jia Liang
- Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional Materials, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, China.
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4
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Konwar D, Bora U. Recent Developments in Transition‐Metal‐Catalyzed Regioselective Functionalization of Imidazo[1, 2‐
a
]pyridine. ChemistrySelect 2021. [DOI: 10.1002/slct.202100144] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Dipika Konwar
- Department of Chemical Sciences Tezpur University, Napaam, Tezpur PIN 784028 Assam India
| | - Utpal Bora
- Department of Chemical Sciences Tezpur University, Napaam, Tezpur PIN 784028 Assam India
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5
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Wang H, Ying P, Yu J, Su W. Alternative Strategies Enabling Cross-Dehydrogenative Coupling: Access to C—C Bonds. CHINESE J ORG CHEM 2021. [DOI: 10.6023/cjoc202009053] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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6
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Yi N, Ouyang M, Liu H, Yan M, Wen X, Xiong Y, Yi B. Thiocyanation of α-amino carbonyl compounds for the synthesis of aromatic thiocyanates. JOURNAL OF CHEMICAL RESEARCH 2020. [DOI: 10.1177/1747519820923553] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A procedure for K2S2O8-mediated thiocyanation of α-amino carbonyl compounds has been developed for the synthesis of aromatic thiocyanates. A series of α-amino carbonyl compounds have been investigated, and the desired products are obtained in 74%–93% yields. This strategy has the advantages of simple reaction conditions without use of a transition-metal catalyst, high regioselectivity, and high efficiency. Moreover, we found that arylamine thiocyanates can also be obtained from α-amino carbonyl compounds and potassium thiocyanate in the presence of CoCl2·6H2O, I2, and dimethyl sulfoxide through the cleavage of the C–N bond. To explore the reaction mechanism, we designed several control experiments and proposed a possible mechanism using the experimental results and related literature reports.
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Affiliation(s)
- Niannian Yi
- Hunan Provincial Key Laboratory of Environmental Catalysis and Waste Recycling, College of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan, P.R. China
| | - Mingjing Ouyang
- Hunan Provincial Key Laboratory of Environmental Catalysis and Waste Recycling, College of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan, P.R. China
| | - Huimin Liu
- Hunan Provincial Key Laboratory of Environmental Catalysis and Waste Recycling, College of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan, P.R. China
| | - Miao Yan
- Hunan Provincial Key Laboratory of Environmental Catalysis and Waste Recycling, College of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan, P.R. China
| | - Xiaoyong Wen
- Hunan Provincial Key Laboratory of Environmental Catalysis and Waste Recycling, College of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan, P.R. China
| | - Yi Xiong
- Hunan Provincial Key Laboratory of Environmental Catalysis and Waste Recycling, College of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan, P.R. China
| | - Bing Yi
- Hunan Provincial Key Laboratory of Environmental Catalysis and Waste Recycling, College of Chemistry and Chemical Engineering, Hunan Institute of Engineering, Xiangtan, P.R. China
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7
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Guo T, Fu XH, Zhang M, Li YL, Ma YC. Catalyst-free direct cross-dehydrogenative coupling of imidazoheterocycles with glyoxal hydrates: an efficient approach to 1,2-diketones. Org Biomol Chem 2019; 17:3150-3158. [PMID: 30838358 DOI: 10.1039/c9ob00095j] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
An efficient and convenient methodology for catalyst-free cross-dehydrogenative coupling of imidazoheterocycles with glyoxal hydrates in good yields was developed. This methodology exhibits a broad substrate scope and excellent functional group tolerance and offers a straightforward means to produce different heterocycles such as imidazoheterocyclic quinoxaline, imidazoheterocyclic hydantoin and imidazoheterocyclic α-keto ketamine under relatively mild conditions. Biological evaluation showed that the most potent compound 3m possesses significant in vitro antiproliferative activities against human-derived lung cancer cell lines with an IC50 value of 14.8 μM.
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Affiliation(s)
- Tao Guo
- College of Chemistry, Chemical and Environmental Engineering, Henan University of Technology, Zhengzhou, Henan 450001, P. R. China.
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8
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Nandwana N, Patel OPS, Srivathsa MR, Kumar A. Dual Role of Glyoxal in Metal-Free Dicarbonylation Reaction: Synthesis of Symmetrical and Unsymmetrical Dicarbonyl Imidazoheterocycles. ACS OMEGA 2019; 4:10140-10150. [PMID: 31460106 PMCID: PMC6648449 DOI: 10.1021/acsomega.9b00716] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Accepted: 05/22/2019] [Indexed: 05/28/2023]
Abstract
A practical and efficient method has been developed for the dicarbonylation of imidazoheterocycles using glyoxals as dicarbonyl precursors under metal-free conditions in acetic acid. A series of symmetrical and unsymmetrical dicarbonyl imidazoheterocycles was synthesized in good yields. Aryl and alkyl glyoxals also demonstrated excellent reactivity under similar reaction conditions and delivered corresponding dicarbonyl imidazoheterocycles in high yields. It is believed that the glyoxal plays a dual role both as a dicarbonyl source and as an oxidant in this transformation. A probable mechanistic pathway has been proposed based on control experiments and electrospray ionization high-resolution mass spectrometry analysis.
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9
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Gao YC, Huang ZB, Xu L, Li ZD, Lai ZS, Tang RY. Iodine-promoted radical alkyl sulfuration of imidazopyridines with dialkyl azo compounds and elemental sulfur. Org Biomol Chem 2019; 17:2279-2286. [PMID: 30724304 DOI: 10.1039/c8ob03191f] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Dialkyl azo compounds were found to be effective alkyl radical sources for direct alkyl sulfuration with imidazopyridines using elemental sulfur under metal-free conditions. Iodine, an inexpensive and mild reagent, could promote alkyl sulfuration. A variety of quaternary cyanoalkyl radicals were successfully coupled with elemental sulfur. A subsequent C-H sulfuration of imidazopyridines afforded a diverse array of imidazopyridine derivatives bearing cyanoalkylthio groups. The cyano group could be modified and further underwent condensation with 2-aminothiazole to afford an interesting heterocyclic amide. Control experiments showed that iodine could greatly suppress the self-coupling of cyanoalkyl radicals, thus making the sulfuration proceed smoothly.
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Affiliation(s)
- Yong-Chao Gao
- Department of Applied Chemistry, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China.
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10
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HFIP-Promoted Bischler Indole Synthesis under Microwave Irradiation. Molecules 2018; 23:molecules23123317. [PMID: 30558133 PMCID: PMC6321335 DOI: 10.3390/molecules23123317] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Revised: 12/10/2018] [Accepted: 12/11/2018] [Indexed: 11/21/2022] Open
Abstract
1,1,1,3,3,3-Hexafluoropropan-2-ol (HFIP) was found to be effective for the Bischler indole synthesis under microwave irradiation in the absence of a metal catalyst. Under the catalysis of HFIP, a wide range of α-amino arylacetones were successfully transformed into indole derivatives with moderate to good yields.
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11
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Sun B, Deng J, Li D, Jin C, Su W. Photocatalytic aerobic cross-coupling reaction of N-substituted anilines with N-aryl glycine esters: Synthesis of α-aryl α-amino esters. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.10.067] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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12
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Zhu ZQ, Xiao LJ, Zhou CC, Song HL, Xie ZB, Le ZG. A visible-light-promoted cross-dehydrogenative-coupling reaction of N -arylglycine esters with imidazo[1,2- a ]pyridines. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.07.047] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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13
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Zhang JR, Zhan LZ, Wei L, Ning YY, Zhong XL, Lai JX, Xu L, Tang RY. Metal-Free Thiolation of Imidazopyridines with Functionalized Haloalkanes Using Elemental Sulfur. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201701190] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Jun-Rong Zhang
- Department of Applied Chemistry, College of Materials and Energy; South China Agricultural University; Guangzhou 510642 People's Republic of China
| | - Ling-Zhi Zhan
- Department of Applied Chemistry, College of Materials and Energy; South China Agricultural University; Guangzhou 510642 People's Republic of China
| | - Liang Wei
- Department of Applied Chemistry, College of Materials and Energy; South China Agricultural University; Guangzhou 510642 People's Republic of China
| | - Yun-Yun Ning
- Department of Applied Chemistry, College of Materials and Energy; South China Agricultural University; Guangzhou 510642 People's Republic of China
| | - Xiao-Lin Zhong
- Department of Applied Chemistry, College of Materials and Energy; South China Agricultural University; Guangzhou 510642 People's Republic of China
| | - Jing-Xiong Lai
- Department of Applied Chemistry, College of Materials and Energy; South China Agricultural University; Guangzhou 510642 People's Republic of China
| | - Li Xu
- Department of Applied Chemistry, College of Materials and Energy; South China Agricultural University; Guangzhou 510642 People's Republic of China
| | - Ri-Yuan Tang
- Department of Applied Chemistry, College of Materials and Energy; South China Agricultural University; Guangzhou 510642 People's Republic of China
- Key Laboratory of Natural Pesticide & Chemical Biology, Ministry of Education; South China Agricultural University; Guangzhou 510642 People's Republic of China
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14
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Sun B, Wang Y, Li D, Jin C, Su W. A copper/O2-mediated direct sp3 C–H/N–H cross-dehydrogen coupling reaction of acylated amines and N-aryl glycine esters. Org Biomol Chem 2018; 16:2902-2909. [DOI: 10.1039/c8ob00176f] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We described a mild and efficient CDC reaction between N-aryl glycine esters and various acylated amines for the synthesis of α-amino α-amide acid esters with an excellent regioselectivity in the presence of copper salts.
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Affiliation(s)
- Bin Sun
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals
- Zhejiang University of Technology
- Hangzhou
- PR China
| | - Yao Wang
- College of Pharmaceutical Sciences
- Zhejiang University of Technology
- Hangzhou
- PR China
| | - Deyu Li
- College of Pharmaceutical Sciences
- Zhejiang University of Technology
- Hangzhou
- PR China
| | - Can Jin
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals
- Zhejiang University of Technology
- Hangzhou
- PR China
- College of Pharmaceutical Sciences
| | - Weike Su
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals
- Zhejiang University of Technology
- Hangzhou
- PR China
- College of Pharmaceutical Sciences
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15
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Wei Y, Wang J, Wang Y, Yao X, Yang C, Huo C. Auto-oxidation promoted sp3 C–H arylation of glycine derivatives. Org Biomol Chem 2018; 16:4985-4989. [DOI: 10.1039/c8ob01068d] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
An auto-oxidation promoted sp3 C–H arylation reaction between N-aryl glycine derivatives and electron-rich arenes, leading to the formation of N-aryl α-aryl α-amino acid derivatives, is described. This atom-economical and environmentally benign reaction proceeds smoothly under mild reaction conditions and requires only Brønsted acid and oxygen (balloon). A plausible radical involved mechanism is proposed.
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Affiliation(s)
- Yuanyuan Wei
- College of Chemistry and Chemical Engineering
- Northwest Normal University Lanzhou
- Gansu 730070
- China
| | - Jie Wang
- College of Chemistry and Chemical Engineering
- Northwest Normal University Lanzhou
- Gansu 730070
- China
| | - Yajun Wang
- College of Chemistry and Chemical Engineering
- Northwest Normal University Lanzhou
- Gansu 730070
- China
| | - Xiaoqiang Yao
- College of Chemistry and Chemical Engineering
- Northwest Normal University Lanzhou
- Gansu 730070
- China
| | - Caixia Yang
- College of Chemistry and Chemical Engineering
- Northwest Normal University Lanzhou
- Gansu 730070
- China
| | - Congde Huo
- College of Chemistry and Chemical Engineering
- Northwest Normal University Lanzhou
- Gansu 730070
- China
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16
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San Segundo M, Guerrero I, Correa A. Co-Catalyzed C(sp3)–H Oxidative Coupling of Glycine and Peptide Derivatives. Org Lett 2017; 19:5288-5291. [DOI: 10.1021/acs.orglett.7b02567] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Marcos San Segundo
- Department of Organic Chemistry-I, University of the Basque Country (UPV-EHU), Joxe Mari Korta R&D Center, Av. Tolosa 72, 20018 Donostia-San Sebastián, Spain
| | - Itziar Guerrero
- Department of Organic Chemistry-I, University of the Basque Country (UPV-EHU), Joxe Mari Korta R&D Center, Av. Tolosa 72, 20018 Donostia-San Sebastián, Spain
| | - Arkaitz Correa
- Department of Organic Chemistry-I, University of the Basque Country (UPV-EHU), Joxe Mari Korta R&D Center, Av. Tolosa 72, 20018 Donostia-San Sebastián, Spain
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