1
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Suresh S, Palla S, Chung DR, Chien HS, Du BX, Shinde J, Kavala V, Yao CF. Catalyst-free reactions of anilines with β-chloroenones: synthesis of α-chloroenaminones and 1,4-benzodiazepines. Org Biomol Chem 2024. [PMID: 39189549 DOI: 10.1039/d4ob00954a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/28/2024]
Abstract
The Michael addition of anilines to β-chloroenones gives enaminones by the elimination of hydrochloric acid (HCl). These enaminones are transformed into α-chloroenaminones via in situ sp2 C-H functionalization. Anilines that are attached to an electron-donating group react more readily with β-chloroenone to give the corresponding products in excellent yields. A highly atom-economical method has been developed using dimethyl sulfoxide (DMSO) as a green oxidant and solvent. The desired α-functionalized enaminones are formed in good yields with excellent Z-selectivity. We have established the generality of this reaction with many substrates, and scaled-up reactions have been performed to showcase the practical applications. A catalyst-free double annulation of β-chloroenones with o-phenylenediamine has also been demonstrated for the synthesis of 1,4-benzodiazepine derivatives in moderate yields under mild reaction conditions.
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Affiliation(s)
- Sundaram Suresh
- Department of Chemistry, National Taiwan Normal University, No. 88, Sec. 4, Ting-Zhou Rd, Taipei-11677, Taiwan, Republic of China.
| | - Sowndarya Palla
- Department of Chemistry, National Taiwan Normal University, No. 88, Sec. 4, Ting-Zhou Rd, Taipei-11677, Taiwan, Republic of China.
| | - Dai-Ru Chung
- Department of Chemistry, National Taiwan Normal University, No. 88, Sec. 4, Ting-Zhou Rd, Taipei-11677, Taiwan, Republic of China.
| | - Hung-Sheng Chien
- Department of Chemistry, National Taiwan Normal University, No. 88, Sec. 4, Ting-Zhou Rd, Taipei-11677, Taiwan, Republic of China.
| | - Bo-Xun Du
- Department of Chemistry, National Taiwan Normal University, No. 88, Sec. 4, Ting-Zhou Rd, Taipei-11677, Taiwan, Republic of China.
| | - Jivan Shinde
- Department of Chemistry, National Taiwan Normal University, No. 88, Sec. 4, Ting-Zhou Rd, Taipei-11677, Taiwan, Republic of China.
| | - Veerababurao Kavala
- Department of Chemistry, National Taiwan Normal University, No. 88, Sec. 4, Ting-Zhou Rd, Taipei-11677, Taiwan, Republic of China.
| | - Ching-Fa Yao
- Department of Chemistry, National Taiwan Normal University, No. 88, Sec. 4, Ting-Zhou Rd, Taipei-11677, Taiwan, Republic of China.
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2
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Ying J, Zhou T, Liu Y, Zhou L, Wan JP. Transition-Metal-Free C-H Trifluoromethylthiolation of N,N-Disubstituted Enaminones To Access CF 3S-Functionalized Enaminones and Their Application in the Synthesis of CF 3S-Heteroaryls. J Org Chem 2024; 89:9078-9085. [PMID: 38830227 DOI: 10.1021/acs.joc.4c00704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2024]
Abstract
The α-C-H trifluoromethylthiolation of N,N-disubstituted enaminones has been achieved with simple and cheap CF3SO2Na as the CF3S source. The reactions were run at mild temperature (0 °C to rt) using POCl3 as the only reducing reagent. The work represents the first example on the synthesis of α-trifluoromethylthio enaminones via direct C-H functionalization. In addition, the resulting CF3S-functionalized enaminones have been proven as useful building blocks in the synthesis of various CF3S-functionalized heteroaromatic compounds by simple annulation reactions.
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Affiliation(s)
- Jinbiao Ying
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330033, China
| | - Tao Zhou
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330033, China
| | - Yunyun Liu
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330033, China
| | - Liyun Zhou
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330033, China
| | - Jie-Ping Wan
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330033, China
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3
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Shamnad A, Nayak KH, Babu BP. Metal-Free Bisamidation of N-Tosylhydrazones with Carboxylic Acids Promoted by Tetrabutylammonium Iodide and tert-Butyl Hydroperoxide. J Org Chem 2024; 89:6545-6554. [PMID: 38630068 DOI: 10.1021/acs.joc.4c00156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2024]
Abstract
A versatile reaction between N-tosylhydrazones and carboxylic acids to access bisamides is reported. This metal-free, room-temperature reaction was catalyzed by TBAI, while TBHP served as the oxidant. Broad substrate scope and good functional group tolerance are the key features of the strategy. Subsequent intramolecular N-arylation of suitably substituted bisamides readily afforded functionalized 3-indazolones.
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Affiliation(s)
- Ali Shamnad
- Department of Chemistry, National Institute of Technology Karnataka (NITK), Surathkal, Mangalore 575025, Karnataka, India
| | - Kalinga H Nayak
- Department of Chemistry, National Institute of Technology Karnataka (NITK), Surathkal, Mangalore 575025, Karnataka, India
| | - Beneesh P Babu
- Department of Chemistry, National Institute of Technology Karnataka (NITK), Surathkal, Mangalore 575025, Karnataka, India
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4
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Ye J, Liu Y, Luo J, Wan JP. "Alkene-to-Alkene" Difunctionalization of Enaminones for the Synthesis of Polyfunctionalized Alkenes by Transition-Metal-Free C-H and C-N Bond Transformation. Org Lett 2023; 25:8451-8456. [PMID: 37971945 DOI: 10.1021/acs.orglett.3c03353] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2023]
Abstract
The three-component reactions of enaminones, disulfides, and alcohols for the synthesis of polyfunctionalized alkenes have been realized via the C-H and C-N bond transformation on enaminones. The reactions proceed in a novel "alkene-to-alkene" difunctionalization mode without using any transition metal. The application of the alkene products in the synthesis of divergent sulfenyl heteroaryls, including sulfenylated pyrazoles, pyrimidines, and isoxazoles, via simple annulation has also been verified.
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Affiliation(s)
- Jingfeng Ye
- National Engineering Research Center for Carbohydrate Synthesis, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Yunyun Liu
- National Engineering Research Center for Carbohydrate Synthesis, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Jin Luo
- Analytical and Testing Center, Jiangxi Normal University, Nanchang 330022, China
| | - Jie-Ping Wan
- National Engineering Research Center for Carbohydrate Synthesis, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
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5
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Liu D, Song S, Chen L, Zhang M, Liu Z, Lu X, Huang J, Yu F. Access to thiionized-, selenolized-, and alkylated 5-alkylidene 3-pyrrolin-2-one derivatives via a regioselective oxidative annulation reaction. Org Biomol Chem 2023; 21:2596-2602. [PMID: 36891944 DOI: 10.1039/d3ob00014a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
Abstract
A metal-free regioselective oxidative annulation reaction of readily available 2,4-pentanediones with primary amines has been described. This protocol provides a divergent strategy for the incorporation of various radical donors into 5-alkylidene 3-pyrrolin-2-one skeletons, producing a variety of thiionized-, selenolized-, and alkylated 5-alkylidene 3-pyrrolin-2-one derivatives. Moreover, the diverse synthetic transformations of the 5-alkylidene 3-pyrrolin-2-one products were also investigated.
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Affiliation(s)
- Donghan Liu
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, P. R. China.
| | - Siyu Song
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, P. R. China.
| | - Longkun Chen
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, P. R. China.
| | - Mingshuai Zhang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, P. R. China.
| | - Zhuoyuan Liu
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, P. R. China.
| | - Xihang Lu
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, P. R. China.
| | - Jiuzhong Huang
- School of Pharmacy and Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases of Ministry of Education, Gannan Medical University, Ganzhou, 341000, P. R. China.
| | - Fuchao Yu
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, P. R. China.
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6
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Chen D, Wan C, Liu Y, Wan JP. Three-Component Fusion to Pyrazolo[5,1- a]isoquinolines via Rh-Catalyzed Multiple Order Transformation of Enaminones. J Org Chem 2023; 88:4833-4838. [PMID: 36947699 DOI: 10.1021/acs.joc.3c00019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/24/2023]
Abstract
A facile and practical method for the synthesis of fused tricyclic pyrazolo[5,1-a]isoquinolines has been realized via the reactions of enaminones, hydrazine hydrochloride, and internal alkynes. By means of Rh catalysis, the extraordinary high-order bond functionalization, including the transformation of aryl C-H, ketone C═O, and alkenyl C-N bonds in the enaminones, marks the major feature of the cascade reactions. The results disclose the individual advantage of enaminones in the design of novel and efficient synthetic methods.
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Affiliation(s)
- Demao Chen
- National Engineering Research Center for Carbohydrate Synthesis, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, P. R. China
| | - Changfeng Wan
- National Engineering Research Center for Carbohydrate Synthesis, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, P. R. China
| | - Yunyun Liu
- National Engineering Research Center for Carbohydrate Synthesis, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, P. R. China
| | - Jie-Ping Wan
- National Engineering Research Center for Carbohydrate Synthesis, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, P. R. China
- International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing, Jiangsu 210037, P. R. China
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7
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Tian S, Liu Y, Wan C, Wan JP, Hao G. Catalyst-Free Cascade Annulation of Enaminones and Aryl Diazonium Tetrafluoroboronates for Cinnoline Synthesis and the Anti-Inflammatory Activity Study. J Org Chem 2023; 88:2433-2442. [PMID: 36753776 DOI: 10.1021/acs.joc.2c02858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
A simple and concise method for the synthesis of cinnolines has been developed by the reactions of readily available enaminones and aryl diazonium tetrafluoroboronates. The reactions run efficiently to provide cinnolines with broad diversity in the substructure by heating in dimethyl sulfoxide without using any catalyst or additive. In addition, the primary investigation of the anti-inflammatory activity of these products leads to the observation of p-chlorobenzoyl (3f) and p-nitrobenzoyl (3j) cinnolines as attractive anti-inflammatory compounds in vitro.
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Affiliation(s)
- Shanghui Tian
- National Engineering Research Center for Carbohydrate Synthesis, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Yunyun Liu
- National Engineering Research Center for Carbohydrate Synthesis, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Changfeng Wan
- National Engineering Research Center for Carbohydrate Synthesis, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Jie-Ping Wan
- National Engineering Research Center for Carbohydrate Synthesis, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China.,International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing 210037, China
| | - Guifeng Hao
- Center for General Practice Medicine, Department of Rheumatology and Immunology, Zhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College), Hangzhou 310014, China
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8
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Liu N, Cuan X, Li H, Duan X. Progress in the Study of α-Functionalization of Enaminone. CHINESE J ORG CHEM 2023. [DOI: 10.6023/cjoc202207027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
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9
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Lu MZ, Goh J, Maraswami M, Jia Z, Tian JS, Loh TP. Recent Advances in Alkenyl sp 2 C-H and C-F Bond Functionalizations: Scope, Mechanism, and Applications. Chem Rev 2022; 122:17479-17646. [PMID: 36240299 DOI: 10.1021/acs.chemrev.2c00032] [Citation(s) in RCA: 44] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Alkenes and their derivatives are featured widely in a variety of natural products, pharmaceuticals, and advanced materials. Significant efforts have been made toward the development of new and practical methods to access this important class of compounds by selectively activating the alkenyl C(sp2)-H bonds in recent years. In this comprehensive review, we describe the state-of-the-art strategies for the direct functionalization of alkenyl sp2 C-H and C-F bonds until June 2022. Moreover, metal-free, photoredox, and electrochemical strategies are also covered. For clarity, this review has been divided into two parts; the first part focuses on currently available alkenyl sp2 C-H functionalization methods using different alkene derivatives as the starting materials, and the second part describes the alkenyl sp2 C-F bond functionalization using easily accessible gem-difluoroalkenes as the starting material. This review includes the scope, limitations, mechanistic studies, stereoselective control (using directing groups as well as metal-migration strategies), and their applications to complex molecule synthesis where appropriate. Overall, this comprehensive review aims to document the considerable advancements, current status, and emerging work by critically summarizing the contributions of researchers working in this fascinating area and is expected to stimulate novel, innovative, and broadly applicable strategies for alkenyl sp2 C-H and C-F bond functionalizations in the coming years.
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Affiliation(s)
- Ming-Zhu Lu
- College of Advanced Interdisciplinary Science and Technology, Henan University of Technology, Zhengzhou 450001, China.,School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, Singapore 637371, Singapore
| | - Jeffrey Goh
- School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, Singapore 637371, Singapore
| | - Manikantha Maraswami
- School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, Singapore 637371, Singapore
| | - Zhenhua Jia
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Jie-Sheng Tian
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, China
| | - Teck-Peng Loh
- College of Advanced Interdisciplinary Science and Technology, Henan University of Technology, Zhengzhou 450001, China.,School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, Singapore 637371, Singapore.,Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, China
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10
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Duan X, Liu K, Meng Z, Guo Y, Li H, Liu N, Qu W, Duan X, Ma J. 1,3-Dibromo-5, 5-dimethylhydantoin (DBDMH)-Promoted Cross-Coupling of Enaminones with Phenols under Metal-Free Conditions. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.154111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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11
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Liu Y, Zhang T, Wan JP. Ultrasound-Promoted Synthesis of α-Thiocyanoketones via Enaminone C═C Bond Cleavage and Tunable One-Pot Access to 4-Aryl-2-aminothiazoles. J Org Chem 2022; 87:8248-8255. [PMID: 35616657 DOI: 10.1021/acs.joc.2c00708] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Ultrasound has been successfully employed to promote the thiocyanation of the C═C bond in enaminones for the synthesis of α-thiocyanoketones and 2-aminothiazoles. The reactions of enaminones with ammonium thiocyanate provide α-thiocyanoketones with ultrasound irradiation at room temperature. More interestingly, simply further heating the vessel after ultrasonic irradiation leads to the selective synthesis of 2-aminothiazoles with an unconventional 4-aryl substructure.
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Affiliation(s)
- Yunyun Liu
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Tao Zhang
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Jie-Ping Wan
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
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12
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Wang Z, Zhao B, Liu Y, Wan J. Recent Advances in Reactions Using Enaminone in Water or Aqueous Medium. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200144] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Zhouying Wang
- College of Chemistry and Chemical Engineering Jiangxi Normal University Nanchang 330022 People's Republic of China
| | - Baoli Zhao
- Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process Shaoxing University Shaoxing Zhejiang 312000 People's Republic of China
| | - Yunyun Liu
- College of Chemistry and Chemical Engineering Jiangxi Normal University Nanchang 330022 People's Republic of China
| | - Jie‐Ping Wan
- College of Chemistry and Chemical Engineering Jiangxi Normal University Nanchang 330022 People's Republic of China
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13
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Ying J, Liu T, Liu Y, Wan JP. Base-Promoted Annulative Difluoromethylenation of Enaminones with BrCF 2CO 2Et toward 2,2-Difluorinated 2,3-Dihydrofurans. Org Lett 2022; 24:2404-2408. [PMID: 35302379 DOI: 10.1021/acs.orglett.2c00671] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A practical method for the synthesis of 2,2-difluorinated 2,3-dihydrofurans has been established via the [4 + 1] annulation of enaminones and BrCF2CO2Et with Na2CO3 promotion. This new protocol does not employ any transition metal reagent and enables the annulative difluoromethylation by the partial cleavage of the C═C double bond. In addition, the further treatment with hydrochloric acid in one pot leads to β-keto enoic acids (4-oxo-2-butenoic acids) via a formal enaminone C-N carboxylation.
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Affiliation(s)
- Jinbiao Ying
- Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China
| | - Ting Liu
- Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China
| | - Yunyun Liu
- Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China
| | - Jie-Ping Wan
- Key Lab of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China
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14
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Amine-catalyzed synthesis of N2-sulfonyl 1,2,3-triazole in water and the tunable N2-H 1,2,3-triazole synthesis in DMSO via metal-free enamine annulation. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2021.08.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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15
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Kong L, Hu X, Bai LP. TBAI-Catalyzed Oxidative Coupling of Benzyl Ketones to Synthesize 2,3-Diaryl-1,4-Diketones in Water. ACS OMEGA 2022; 7:2337-2343. [PMID: 35071921 PMCID: PMC8772304 DOI: 10.1021/acsomega.1c06216] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Accepted: 12/30/2021] [Indexed: 05/09/2023]
Abstract
An efficient and green route of C-C bond formation was disclosed to construct 2,3-diaryl-1,4-diketones from α-methylene ketones by the catalysis of tetrabutylammonium iodide (TBAI) with tert-butyl hydroperoxide (TBHP) as an oxidant in water. This reaction affords the desired products in good to excellent yields from readily available materials, with a broad substrate scope, good functional group tolerance, and mild reaction conditions. Furthermore, tetrasubstituted furan and pyrrole were smoothly constructed from α-methylene ketones in one pot with 96 and 90% yields, respectively.
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Affiliation(s)
- Lingkai Kong
- State
Key Laboratory of Quality Research in Chinese Medicine, Macau Institute
for Applied Research in Medicine and Health, Macau University of Science and Technology, Taipa, Macau 999078, People’s Republic
of China
- School
of Chemistry and Chemical Engineering, Linyi
University, Linyi, Shandong 276000, People’s Republic of China
| | - Xueping Hu
- School
of Chemistry and Chemical Engineering, Linyi
University, Linyi, Shandong 276000, People’s Republic of China
| | - Li-Ping Bai
- State
Key Laboratory of Quality Research in Chinese Medicine, Macau Institute
for Applied Research in Medicine and Health, Macau University of Science and Technology, Taipa, Macau 999078, People’s Republic
of China
- Guangdong-Hong
Kong-Macao Joint Laboratory of Respiratory Infectious Disease, Macau University of Science and Technology, Taipa 999078, People’s Republic of China
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16
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Liu D, Lu X, Zhang Q, Zhao Y, Zhang B, Sun Y, Dai W, Xu Y, Yu F. Facile approach to multifunctionalized 5-alkylidene-3-pyrrolin-2-ones via regioselective oxidative cyclization of 2,4-pentanediones with primary amines and sodium sulfinates. Org Chem Front 2022. [DOI: 10.1039/d2qo00473a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Highly functionalized 5-alkylidene-3-pyrrolin-2-ones were efficiently synthesized via a four-component cascade cyclization/sulfonylation reaction between readily available 2,4-pentanediones, primary amines and sodium sulfinates under mild conditions.
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Affiliation(s)
- Donghan Liu
- Faculty of Life Science and Technology, Kunming, University of Science and Technology, Kunming, 650500, P. R. China
| | - Xihang Lu
- Faculty of Life Science and Technology, Kunming, University of Science and Technology, Kunming, 650500, P. R. China
| | - Qiaohe Zhang
- Faculty of Life Science and Technology, Kunming, University of Science and Technology, Kunming, 650500, P. R. China
| | - Yuxuan Zhao
- Faculty of Life Science and Technology, Kunming, University of Science and Technology, Kunming, 650500, P. R. China
| | - Biao Zhang
- Faculty of Life Science and Technology, Kunming, University of Science and Technology, Kunming, 650500, P. R. China
| | - Yulin Sun
- Faculty of Life Science and Technology, Kunming, University of Science and Technology, Kunming, 650500, P. R. China
| | - Weifeng Dai
- Faculty of Life Science and Technology, Kunming, University of Science and Technology, Kunming, 650500, P. R. China
| | - Yu Xu
- School of nursing, Xi'an Innovation College of Yan'an University, Xi'an, 710100, P. R. China
| | - Fuchao Yu
- Faculty of Life Science and Technology, Kunming, University of Science and Technology, Kunming, 650500, P. R. China
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17
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Enamines and their variants as intermediates for synthesis of aza-heterocycles with applications in MCRs. Tetrahedron 2022. [DOI: 10.1016/j.tet.2021.132545] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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18
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Sofi FA, Sharma R, Masoodi MH, Tabassum N. Recent developments in oxidative functionalization reactions promoted by TBAI/TBHP. SYNTHETIC COMMUN 2021. [DOI: 10.1080/00397911.2021.2001659] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Firdoos Ahmad Sofi
- Department of Pharmaceutical Sciences, School of Applied Sciences and Technology, University of Kashmir, Srinagar, India
| | - Rohit Sharma
- Department of Forest Products, College of Forestry, Dr. Y.S. Parmar University of Horticulture and Forestry, Nauni, India
| | - Mubashir H. Masoodi
- Department of Pharmaceutical Sciences, School of Applied Sciences and Technology, University of Kashmir, Srinagar, India
| | - Nahida Tabassum
- Department of Pharmaceutical Sciences, School of Applied Sciences and Technology, University of Kashmir, Srinagar, India
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19
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Suresh S, Bhimrao Patil P, Yu P, Fang C, Weng Y, Kavala V, Yao C. A Study of the Reactions of 3‐Bromopropenals with Anilines for the Synthesis of α‐Bromo Enaminones. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100779] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Sundaram Suresh
- Department of Chemistry National Taiwan Normal University 88, Sec. 4, Ting-Zhou Road Taipei Taiwan 116, R.O.C
| | - Prakash Bhimrao Patil
- Department of Chemistry National Taiwan Normal University 88, Sec. 4, Ting-Zhou Road Taipei Taiwan 116, R.O.C
| | - Pao‐Hsing Yu
- Department of Chemistry National Taiwan Normal University 88, Sec. 4, Ting-Zhou Road Taipei Taiwan 116, R.O.C
| | - Chia‐Chi Fang
- Department of Chemistry National Taiwan Normal University 88, Sec. 4, Ting-Zhou Road Taipei Taiwan 116, R.O.C
| | - Yin‐Zhi Weng
- Department of Chemistry National Taiwan Normal University 88, Sec. 4, Ting-Zhou Road Taipei Taiwan 116, R.O.C
| | - Veerababurao Kavala
- Department of Chemistry National Taiwan Normal University 88, Sec. 4, Ting-Zhou Road Taipei Taiwan 116, R.O.C
| | - Ching‐Fa Yao
- Department of Chemistry National Taiwan Normal University 88, Sec. 4, Ting-Zhou Road Taipei Taiwan 116, R.O.C
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20
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Zhang C, Guo H, Chen L, Zhang J, Guo M, Zhu X, Shen C, Li Z. One-Pot Synthesis of Symmetrical and Asymmetrical 3-Amino Diynes via Cu(I)-Catalyzed Reaction of Enaminones with Terminal Alkynes. Org Lett 2021; 23:8169-8173. [PMID: 34636564 DOI: 10.1021/acs.orglett.1c02848] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
An economical and efficient protocol for the direct construction of amino skipped diynes through the Cu(I)-catalyzed reaction of enaminones and terminal alkynes has been described. Different kinds of symmetrical and asymmetrical 3-amino diynes could be obtained in up to 83% yield through a one-pot reaction under mild conditions.
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Affiliation(s)
- Changyuan Zhang
- Key Laboratory of Jiangxi University for Applied Chemistry and Chemical Biology, College of Chemistry and Bio-engineering, Yichun University, Yichun 336000, P.R. China
| | - Huosheng Guo
- Key Laboratory of Jiangxi University for Applied Chemistry and Chemical Biology, College of Chemistry and Bio-engineering, Yichun University, Yichun 336000, P.R. China
| | - Lulu Chen
- Key Laboratory of Jiangxi University for Applied Chemistry and Chemical Biology, College of Chemistry and Bio-engineering, Yichun University, Yichun 336000, P.R. China
| | - Jiantao Zhang
- College of Chemistry, Guangdong University of Petrochemical Technology, Guandu Road, Maoming 525000, P. R. China
| | - Mengping Guo
- Key Laboratory of Jiangxi University for Applied Chemistry and Chemical Biology, College of Chemistry and Bio-engineering, Yichun University, Yichun 336000, P.R. China
| | - Xuncheng Zhu
- Key Laboratory of Jiangxi University for Applied Chemistry and Chemical Biology, College of Chemistry and Bio-engineering, Yichun University, Yichun 336000, P.R. China
| | - Chan Shen
- Key Laboratory of Jiangxi University for Applied Chemistry and Chemical Biology, College of Chemistry and Bio-engineering, Yichun University, Yichun 336000, P.R. China
| | - Zeng Li
- Key Laboratory of Jiangxi University for Applied Chemistry and Chemical Biology, College of Chemistry and Bio-engineering, Yichun University, Yichun 336000, P.R. China
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21
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Yu Q, Liu Y, Wan JP. Metal-free C(sp2)-H perfluoroalkylsulfonylation and configuration inversion: Stereoselective synthesis of α-perfluoroalkylsulfonyl E-enaminones. CHINESE CHEM LETT 2021. [DOI: 10.1016/j.cclet.2021.04.037] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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22
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Liu T, Wan JP, Liu Y. Metal-free enaminone C-N bond cyanation for the stereoselective synthesis of ( E)- and ( Z)-β-cyano enones. Chem Commun (Camb) 2021; 57:9112-9115. [PMID: 34498638 DOI: 10.1039/d1cc03292e] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A highly practical method for C-CN bond formation by C-N bond cleavage on enaminones leading to the efficient synthesis of β-cyano enones is developed. The reactions take place efficiently to provide (E)-β-cyano enones with only a molecular iodine catalyst. In addition, the additional employment of oxalic acid enables the selective synthesis of (Z)-β-cyano enones.
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Affiliation(s)
- Ting Liu
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China.
| | - Jie-Ping Wan
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China.
| | - Yunyun Liu
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China.
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23
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Zhao Y, Mandal D, Guo J, Wu Y, Stephan DW. B(C 6F 5) 3-Catalyzed site-selective N1-alkylation of benzotriazoles with diazoalkanes. Chem Commun (Camb) 2021; 57:7758-7761. [PMID: 34254070 DOI: 10.1039/d1cc03048e] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Alkylation of benzotriazoles is synthetically challenging, often leading to mixtures of N1 and N2 alkylation. Herein, metal-free catalytic site-selective N1-alkylation of benzotriazoles with diazoalkanes is described in the presence of 10 mol% of B(C6F5)3. These reactions provide N1-alkylated benzotriazoles in good to excellent yields and this protocol is successfully adapted to gram-scale syntheses as well as a derivative with antimicrobial activity.
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Affiliation(s)
- Yunbo Zhao
- Institute of Drug Discovery Technology, Ningbo University, Zhejiang, China.
| | - Dipendu Mandal
- Institute of Drug Discovery Technology, Ningbo University, Zhejiang, China.
| | - Jing Guo
- Institute of Drug Discovery Technology, Ningbo University, Zhejiang, China.
| | - Yile Wu
- Institute of Drug Discovery Technology, Ningbo University, Zhejiang, China.
| | - Douglas W Stephan
- Institute of Drug Discovery Technology, Ningbo University, Zhejiang, China. and Department of Chemistry, University of Toronto, Toronto, 80 St. George Street, Ontario M5S 3H6, Canada.
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24
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Liu T, Wei L, Zhao B, Liu Y, Wan JP. Copper-Catalyzed Enaminone C(sp 2)-N Bond Phosphonation for Stereoselective Synthesis of Alkenylphosphonates. J Org Chem 2021; 86:9861-9868. [PMID: 34189914 DOI: 10.1021/acs.joc.1c00862] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A direct enaminone C-N bond coupling functionalization that generates a new C-P bond using dialkyl phosphonate for the efficient and stereoselective synthesis of (E)-alkenylphosphonates is reported. The reactions toward target products proceed well with a broad scope, disclosing a valuable new synthetic application of enaminones by the interesting C(sp2)-N bond elaboration.
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Affiliation(s)
- Ting Liu
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, People's Republic of China
| | - Li Wei
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, People's Republic of China
| | - Baoli Zhao
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, People's Republic of China.,Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process, Shaoxing University, Shaoxing 312000, People's Republic of China
| | - Yunyun Liu
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, People's Republic of China
| | - Jie-Ping Wan
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, People's Republic of China
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25
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Duan X, Li H, Li W, Wang J, Liu N. NBS‐Promoted C−H Amination of Enaminones for the Synthesis of N‐Heterocycle Substituted Enaminones**. ChemistrySelect 2021. [DOI: 10.1002/slct.202101726] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Xiyan Duan
- School of Chemical Engineering & Pharmaceutics Henan University of Science and Technology Luoyang 471003 Henan China
| | - Huimin Li
- School of Chemical Engineering & Pharmaceutics Henan University of Science and Technology Luoyang 471003 Henan China
| | - Weinan Li
- School of Chemical Engineering & Pharmaceutics Henan University of Science and Technology Luoyang 471003 Henan China
| | - Junqi Wang
- School of Chemical Engineering & Pharmaceutics Henan University of Science and Technology Luoyang 471003 Henan China
| | - Ning Liu
- School of Nursing Henan University of Science and Technology Luoyang 471003 Henan China
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26
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Xu Z, Fu L, Fang X, Huang B, Zhou L, Wan JP. Tunable Trifunctionalization of Tertiary Enaminones for the Regioselective and Metal-Free Synthesis of Discrete and Proximal Phosphoryl Nitriles. Org Lett 2021; 23:5049-5053. [PMID: 34137270 DOI: 10.1021/acs.orglett.1c01581] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
This paper reports an unprecedented trifunctionalization of tertiary enaminones for the synthesis phosphoryl nitriles by the reactions of enaminones with diarylphosphine oxides and trimethylsilyl cyanide (TMSCN) without the use of any metal reagent. Employing tetrabutyl ammonium hydroxide (TBAH) as the catalyst (0.2 equiv) enables discrete cyanophosphonation. On the other hand, selective proximal cyanophosphonation has been realized in the presence of acetic acid only (AcOH).
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Affiliation(s)
- Zhongrong Xu
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China
| | - Leiqing Fu
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China
| | - Xia Fang
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China
| | - Bin Huang
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China
| | - Liyun Zhou
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China
| | - Jie-Ping Wan
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China
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27
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Fu L, Liu Y, Wan JP. Pd-Catalyzed Triple-Fold C(sp 2)-H Activation with Enaminones and Alkenes for Pyrrole Synthesis via Hydrogen Evolution. Org Lett 2021; 23:4363-4367. [PMID: 34013729 DOI: 10.1021/acs.orglett.1c01301] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The synthesis of NH-free pyrroles via Pd-catalyzed annulation of enaminones and alkenes is reported. With the catalysis of Pd(II), the activation of triple C(sp2)-H bonds, including one internal C(sp2)-H bond in enaminone, has been activated to provide various pyrroles. The interesting evolution of hydrogen gas from the reactions has been observed by a hydrogen detector.
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Affiliation(s)
- Leiqing Fu
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China.,College of Chemistry and Bio-Engineering, Yichun University, Yichun, Jiangxi 336000, P. R. China
| | - Yunyun Liu
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China
| | - Jie-Ping Wan
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China
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28
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Chen XB, Huang ST, Li J, Yang Q, Yang L, Yu F. Highly Regioselective and Chemoselective [3 + 3] Annulation of Enaminones with ortho-Fluoronitrobenzenenes: Divergent Synthesis of Aposafranones and Their N-Oxides. Org Lett 2021; 23:3032-3037. [PMID: 33792341 DOI: 10.1021/acs.orglett.1c00710] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
A base-promoted unprecedented strategy for the regioselective and chemoselective divergent synthesis of highly functionalized aposafranones and their N-oxides has been developed from the [3 + 3] annulation of enaminones with o-fluoronitrobenzenenes. This novel synthetic strategy offers an alternative method for the construction of aposafranones and their N-oxides are meaningful in the fields of both biology and organic synthesis. The established protocol explores the annulation scope of enaminones, and it expands the application of nitro-based cyclization.
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Affiliation(s)
- Xue-Bing Chen
- College of Science, Honghe University, Mengzi, 661199, Yunnan, China
| | - Shun-Tao Huang
- College of Science, Honghe University, Mengzi, 661199, Yunnan, China
| | - Jie Li
- College of Science, Honghe University, Mengzi, 661199, Yunnan, China
| | - Qi Yang
- College of Science, Honghe University, Mengzi, 661199, Yunnan, China
| | - Li Yang
- College of Science, Honghe University, Mengzi, 661199, Yunnan, China
| | - Fuchao Yu
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650504, People's Republic of China
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29
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Zhang B, Liu D, Sun Y, Zhang Y, Feng J, Yu F. Preparation of Thiazole-2-thiones through TBPB-Promoted Oxidative Cascade Cyclization of Enaminones with Elemental Sulfur. Org Lett 2021; 23:3076-3082. [DOI: 10.1021/acs.orglett.1c00751] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Biao Zhang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, P. R. China
| | - Donghan Liu
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, P. R. China
| | - Yulin Sun
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, P. R. China
| | - Yajing Zhang
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, P. R. China
| | - Jiayi Feng
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, P. R. China
| | - Fuchao Yu
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming 650500, P. R. China
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30
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Galenko EE, Bodunov VA, Kryukova MA, Novikov MS, Khlebnikov AF. Buchner Reaction/Azirine Modification Approach Toward Cycloheptatriene Containing Nitrogen Heterocyclic Scaffolds. J Org Chem 2021; 86:4098-4111. [PMID: 33571409 DOI: 10.1021/acs.joc.0c02928] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The reaction conditions for the Buchner reaction of 2-(diazoacetyl)-2H-azirines with benzene leading to 2-(cyclohepta-2,4,6-trien-1-yl)-2H-azirines have been found. The azirine fragment of these compounds was subsequently used to prepare 5-(cyclohepta-2,4,6-trien-1-yl)isoxazoles and α-(cyclohepta-2,4,6-triene-1-ylcarbonyl)-1H-pyrroles. NMR and DFT calculations showed that the cycloheptatriene-norcaradiene valence isomerization in the corresponding moieties of synthesized azirines, isoxazoles, and pyrroles is very fast at room temperature. Cycloheptatriene valence isomer predominates in azirines and pyrroles, while 5-(cycloheptatrienyl)isoxazoles exist in a pure cycloheptatriene form at 25 °C in chloroform solution. In accordance with the X-ray analysis, two of the synthesized pyrroles crystallized as norcaradiene isomers from a solution of equilibrium mixture of valence isomers. Reductive isoxazole ring opening using the Mo(CO)6/H2O reductive system afforded (Z)-3-amino-3-aryl-1-(cyclohepta-2,4,6-trien-1-yl)prop-2-en-1-ones, which are pure cycloheptatriene isomers. α-(Cycloheptatrieneylcarbonyl)-1H-pyrroles were transformed into the α-(benzylcarbonyl)-1H-pyrroles under cooperative TFA/Rh2(TFA)4 catalysis.
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Affiliation(s)
- Ekaterina E Galenko
- Saint Petersburg State University, Institute of Chemistry, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
| | - Vladimir A Bodunov
- Saint Petersburg State University, Institute of Chemistry, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
| | - Mariya A Kryukova
- Saint Petersburg State University, Institute of Chemistry, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
| | - Mikhail S Novikov
- Saint Petersburg State University, Institute of Chemistry, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
| | - Alexander F Khlebnikov
- Saint Petersburg State University, Institute of Chemistry, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
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31
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Synthesis, Crystal structure and DFT studies of Polyfunctionalized Alkenes: A transition Metal-Free C(sp2)-H Sulfenylation of electron deficient Alkyne. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129089] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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32
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Nguyen KX, Pham PH, Nguyen TT, Yang CH, Pham HTB, Nguyen TT, Wang H, Phan NTS. Trisulfur-Radical-Anion-Triggered C(sp 2)-H Amination of Electron-Deficient Alkenes. Org Lett 2020; 22:9751-9756. [PMID: 33261315 DOI: 10.1021/acs.orglett.0c03846] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A trisulfur-radical-anion (S3̇-)-triggered C(sp2)-H amination of α,β-unsaturated carbonyl derivatives with simple amines has been demonstrated. This protocol provides convenient access to a variety of synthetically valuable N-unprotected and secondary β-enaminones with absolute Z selectivity and tertiary β-enaminones with E selectivity. Mechanistic probe and electronic structure theory calculations suggest that S3̇- initiates the nucleophilic attacks via a thiirane intermediate.
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Affiliation(s)
- Khang X Nguyen
- Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet, District 10, Ho Chi Minh City, Vietnam.,Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam
| | - Phuc H Pham
- Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet, District 10, Ho Chi Minh City, Vietnam.,Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam
| | - Thao T Nguyen
- Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet, District 10, Ho Chi Minh City, Vietnam.,Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam.,Tra Vinh University, 126 Nguyen Thien Thanh, Ward 5, Tra Vinh City, Tra Vinh Province, Vietnam
| | - Chou-Hsun Yang
- Department of Chemistry, University of Colorado Denver, Denver, Colorado 80204, United States
| | - Hoai T B Pham
- Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet, District 10, Ho Chi Minh City, Vietnam.,Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam.,Department of Chemistry, University of Colorado Denver, Denver, Colorado 80204, United States
| | - Tung T Nguyen
- Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet, District 10, Ho Chi Minh City, Vietnam.,Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam
| | - Haobin Wang
- Department of Chemistry, University of Colorado Denver, Denver, Colorado 80204, United States
| | - Nam T S Phan
- Faculty of Chemical Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet, District 10, Ho Chi Minh City, Vietnam.,Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam
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33
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Chauhan S, Verma P, Kandasamy J, Srivastava V. A Practical Synthesis of 3‐Functionalized Coumarins from
o
‐Cresols and Active Methylene Compounds under Metal and Catalyst‐Free Conditions Using
tert
‐Butyl Hydrogen Peroxide. ChemistrySelect 2020. [DOI: 10.1002/slct.202002263] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Swati Chauhan
- Department of ChemistryIndian Institute of Technology (BHU) Varanasi 221005 India
| | - Pratibha Verma
- Department of ChemistryIndian Institute of Technology (BHU) Varanasi 221005 India
| | - Jeyakumar Kandasamy
- Department of ChemistryIndian Institute of Technology (BHU) Varanasi 221005 India
| | - Vandana Srivastava
- Department of ChemistryIndian Institute of Technology (BHU) Varanasi 221005 India
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34
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Nayak MK, Stubbe J, Neuman NI, Narayanan RS, Maji S, Schulzke C, Chandrasekhar V, Sarkar B, Jana A. N,N'-Ethylene-Bridged Bis-2-Aryl-Pyrrolinium Cations to E-Diaminoalkenes: Non-Identical Stepwise Reversible Double-Redox Coupled Bond Activation Reactions. Chemistry 2020; 26:4425-4431. [PMID: 31994763 PMCID: PMC7187269 DOI: 10.1002/chem.202000255] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Indexed: 12/31/2022]
Abstract
This work presents a stepwise reversible two‐electron transfer induced hydrogen shift leading to the conversion of a bis‐pyrrolinium cation to an E‐diaminoalkene and vice versa. Remarkably, the forward and the reverse reaction, which are both reversible, follow two completely different reaction pathways. Establishing such unprecedented property in this type of processes was possible by developing a novel synthetic route towards the starting dication. All intermediates involved in both the forward and the backward reactions were comprehensively characterized by a combination of spectroscopic, crystallographic, electrochemical, spectroelectrochemical, and theoretical methods. The presented synthetic route opens up new possibilities for the generation of multi‐pyrrolinium cation scaffold‐based organic redox systems, which constitute decidedly sought‐after molecules in contemporary chemistry.
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Affiliation(s)
- Mithilesh Kumar Nayak
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad, 500107, India
| | - Jessica Stubbe
- Institut für Chemie und Biochemie, Anorganische Chemie, Freie Universität Berlin, Fabeckstraße 34-36, 14195, Berlin, Germany
| | - Nicolás I Neuman
- Institut für Chemie und Biochemie, Anorganische Chemie, Freie Universität Berlin, Fabeckstraße 34-36, 14195, Berlin, Germany.,Instituto de Desarrollo Tecnológico para la Industria Química, CCT Santa Fe CONICET-UNL, Colectora Ruta Nacional 168, Km 472, Paraje El Pozo, 3000, Santa Fe, Argentina
| | | | - Sandipan Maji
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad, 500107, India
| | - Carola Schulzke
- Institut für Biochemie, Universität Greifswald, Felix-Hausdorff-Straße 4, 17487, Greifswald, Germany
| | - Vadapalli Chandrasekhar
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad, 500107, India.,Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Biprajit Sarkar
- Institut für Chemie und Biochemie, Anorganische Chemie, Freie Universität Berlin, Fabeckstraße 34-36, 14195, Berlin, Germany.,Institut für Anorganische Chemie, Lehrstuhl für Anorganische Koordinationschemie, Universität Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany
| | - Anukul Jana
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad, 500107, India
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35
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Yahata K, Kaneko Y, Akai S. Cobalt-Catalyzed Intermolecular Markovnikov Hydroamination of Nonactivated Olefins: N2-Selective Alkylation of Benzotriazole. Org Lett 2020; 22:598-603. [DOI: 10.1021/acs.orglett.9b04375] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Kenzo Yahata
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Yuki Kaneko
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Shuji Akai
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
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36
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Sorabad GS, Maddani MR. Facile, regioselective oxidative selenocyanation of N-aryl enaminones under transition-metal-free conditions. NEW J CHEM 2020. [DOI: 10.1039/c9nj05845a] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The present selenocyanation is applied for the synthesis of selenocyanated chromones, indoles and anilines in good to excellent yields.
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Affiliation(s)
- Ganesh Shivayogappa Sorabad
- Department of Post-Graduate Studies and Research in Chemistry Mangalore University
- Mangalgangothri-574199
- India
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37
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Soni S, Koley S, Ansari MA, Singh MS. Site‐Specific S‐Allylation of α‐Enolic Dithioesters with Morita‐Baylis‐Hillman Acetates at Room Temperature: Precursor for Thiopyrans. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900580] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Sonam Soni
- Department of Chemistry, Institute of Science Banaras Hindu University Varanasi 221005 India
| | - Suvajit Koley
- Department of Chemistry, Institute of Science Banaras Hindu University Varanasi 221005 India
| | - Monish A. Ansari
- Department of Chemistry, Institute of Science Banaras Hindu University Varanasi 221005 India
| | - Maya Shankar Singh
- Department of Chemistry, Institute of Science Banaras Hindu University Varanasi 221005 India
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38
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Yang N, Yuan G. One-pot synthesis of 1,3,4-oxadiazol-2(3H)-ones with CO 2 as a C1 synthon promoted by hypoiodite. Org Biomol Chem 2019; 17:6639-6644. [PMID: 31243402 DOI: 10.1039/c9ob01200a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
A convenient and efficient route has been developed to synthesize 1,3,4-oxadiazol-2(3H)-ones from CO2, hydrazines and aryl or aliphatic aldehydes. Promoted by hypoiodite (IO-) generated in situ from KI and oxidant TBHP, the one-pot synthesis could proceed smoothly to afford the desired products in moderate to high yields. Mechanism studies revealed that nitrile imine was an important intermediate in this transformation. Notably, a commercial herbicide Oxadiazon could be successfully synthesized by this route.
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Affiliation(s)
- Na Yang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, P.R. China.
| | - Gaoqing Yuan
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, P.R. China.
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39
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Raziullah, Kumar M, Kant R, Koley D. Cu‐Catalyzed Directed C7−H Imidation of Indolines via Cross‐Dehydrogenative Coupling. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900166] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Raziullah
- Medicinal and Process Chemistry DivisionCSIR-Central Drug Research Institute Lucknow 226031 India
| | - Mohit Kumar
- Medicinal and Process Chemistry DivisionCSIR-Central Drug Research Institute Lucknow 226031 India
| | - Ruchir Kant
- Molecular and Structural Biology DivisionCSIR-Central Drug Research Institute Lucknow 226031 India
| | - Dipankar Koley
- Medicinal and Process Chemistry DivisionCSIR-Central Drug Research Institute Lucknow 226031 India
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40
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Khlebnikov AF, Novikov MS, Rostovskii NV. Advances in 2H-azirine chemistry: A seven-year update. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.03.040] [Citation(s) in RCA: 73] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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41
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Zeng X, Liu C, Yang W, Weng Y, Wang X, Hu Y. Metal-Free Method for Direct Synthesis of Functionalized β-Ketoenamines. J Org Chem 2019; 84:3656-3661. [PMID: 30777428 DOI: 10.1021/acs.joc.8b03247] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
A new method for direct synthesis of β-ketoenamines was developed by a BF3·OEt2-catalyzed cyclization of 1-iodoalkyne and α-keto acid followed by an amine-mediated ring-opening in one pot. Its metal-free conditions allowed the easy synthesis of those products bearing the transition metal-sensitive functional groups. Its three-component process achieved wide range of functionalized products.
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Affiliation(s)
- Xiaobao Zeng
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry , Tsinghua University , Beijing 100084 , P. R. China
| | - Chulong Liu
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry , Tsinghua University , Beijing 100084 , P. R. China
| | - Weiguang Yang
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry , Tsinghua University , Beijing 100084 , P. R. China
| | - Yunxiang Weng
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry , Tsinghua University , Beijing 100084 , P. R. China
| | - Xinyan Wang
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry , Tsinghua University , Beijing 100084 , P. R. China
| | - Yuefei Hu
- Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Department of Chemistry , Tsinghua University , Beijing 100084 , P. R. China
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42
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C O bond formation via oxidative-coupling pathway in eutectic mixture of choline chloride/urea as a green solvent. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2018.12.046] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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43
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Gao Y, Liu Y, Wan JP. Visible Light-Induced Thiocyanation of Enaminone C–H Bond to Access Polyfunctionalized Alkenes and Thiocyano Chromones. J Org Chem 2019; 84:2243-2251. [DOI: 10.1021/acs.joc.8b02981] [Citation(s) in RCA: 105] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Yong Gao
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P.R. China
| | - Yunyun Liu
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P.R. China
| | - Jie-Ping Wan
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P.R. China
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44
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Sorabad GS, Maddani MR. Metal-free, green and efficient oxidative α halogenation of enaminones by halo acid and DMSO. NEW J CHEM 2019. [DOI: 10.1039/c8nj06412a] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Metal free oxidative halogenation of N-aryl enaminones has been demonstrated using a DMSO–halo acid combination under mild reaction conditions. The present method is a straightforward approach and is also applied for the synthesis of chromenone derivatives in excellent yields.
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Affiliation(s)
- Ganesh Shivayogappa Sorabad
- Department of Post-Graduate Studies and Research in Chemistry
- Mangalore University
- Mangalagangothri-574199
- India
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45
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Wang K, Chen P, Ji D, Zhang X, Xu G, Sun J. Rhodium-Catalyzed Regioselective N
2
-Alkylation of Benzotriazoles with Diazo Compounds/Enynones via a Nonclassical Pathway. Angew Chem Int Ed Engl 2018; 57:12489-12493. [DOI: 10.1002/anie.201807039] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 08/03/2018] [Indexed: 01/21/2023]
Affiliation(s)
- Kai Wang
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou China
| | - Ping Chen
- Lab of Computational Chemistry and Drug Design; Key Laboratory of Chemical Genomics; Peking University Shenzhen Graduate School; Shenzhen 518055 China
| | - Danqing Ji
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou China
| | - Xinhao Zhang
- Lab of Computational Chemistry and Drug Design; Key Laboratory of Chemical Genomics; Peking University Shenzhen Graduate School; Shenzhen 518055 China
| | - Guangyang Xu
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou China
| | - Jiangtao Sun
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou China
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46
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Wang K, Chen P, Ji D, Zhang X, Xu G, Sun J. Rhodium-Catalyzed Regioselective N
2
-Alkylation of Benzotriazoles with Diazo Compounds/Enynones via a Nonclassical Pathway. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201807039] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Kai Wang
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou China
| | - Ping Chen
- Lab of Computational Chemistry and Drug Design; Key Laboratory of Chemical Genomics; Peking University Shenzhen Graduate School; Shenzhen 518055 China
| | - Danqing Ji
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou China
| | - Xinhao Zhang
- Lab of Computational Chemistry and Drug Design; Key Laboratory of Chemical Genomics; Peking University Shenzhen Graduate School; Shenzhen 518055 China
| | - Guangyang Xu
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou China
| | - Jiangtao Sun
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology; School of Petrochemical Engineering; Changzhou University; 1 Gehu Road 213164 Changzhou China
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47
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Zhou P, Hu B, Zhao S, Zhang Q, Wang Y, Li X, Yu F. An improved Pfitzinger reaction for the direct synthesis of quinoline-4-carboxylic esters/acids mediated by TMSCl. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.07.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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48
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Huang W, Zhu C, Li M, Yu Y, Wu W, Tu Z, Jiang H. TBAI or KI-Promoted Oxidative Coupling of Enamines and N
-Tosylhydrazine: An Unconventional Method toward 1,5- and 1,4,5-Substituted 1,2,3-Triazoles. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201800487] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Wei Huang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, Guangdong Engineering Research Center for Green Fine Chemicals, School of Chemistry and Chemical Engineering; South China University of Technology; Guangzhou 510640 People's Republic of China
| | - Chuanle Zhu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, Guangdong Engineering Research Center for Green Fine Chemicals, School of Chemistry and Chemical Engineering; South China University of Technology; Guangzhou 510640 People's Republic of China
| | - Minke Li
- Drug Discovery Pipeline & Guangdong Provincial Key Laboratory of Biocomputing; Guangzhou Institutes of Biomedicine and Health; Guangzhou 510530 People's Republic of China
| | - Yue Yu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, Guangdong Engineering Research Center for Green Fine Chemicals, School of Chemistry and Chemical Engineering; South China University of Technology; Guangzhou 510640 People's Republic of China
| | - Wanqing Wu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, Guangdong Engineering Research Center for Green Fine Chemicals, School of Chemistry and Chemical Engineering; South China University of Technology; Guangzhou 510640 People's Republic of China
| | - Zhengchao Tu
- Drug Discovery Pipeline & Guangdong Provincial Key Laboratory of Biocomputing; Guangzhou Institutes of Biomedicine and Health; Guangzhou 510530 People's Republic of China
| | - Huanfeng Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, Guangdong Engineering Research Center for Green Fine Chemicals, School of Chemistry and Chemical Engineering; South China University of Technology; Guangzhou 510640 People's Republic of China
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49
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Guo Y, Xiang Y, Wei L, Wan JP. Thermoinduced Free-Radical C–H Acyloxylation of Tertiary Enaminones: Catalyst-Free Synthesis of Acyloxyl Chromones and Enaminones. Org Lett 2018; 20:3971-3974. [DOI: 10.1021/acs.orglett.8b01536] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Yanhui Guo
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China
| | - Yunfeng Xiang
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China
| | - Li Wei
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China
| | - Jie-Ping Wan
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, P. R. China
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50
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Hu B, Zhou P, Rao K, Yang J, Li L, Yan S, Yu F. Copper-catalyzed direct oxidative C(sp 2 )-H α -sulfenylation of enaminones with disulfides or thiophenols: Synthesis of polyfunctionalized aminothioalkenes. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.02.079] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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