1
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Fernandes RA, Gangani AJ. Palladium-Catalyzed Oxidant Dependent Switchable Aza-Wacker Cyclization and Oxidative Dimerization of Benzimidates. Org Lett 2022; 24:7400-7404. [PMID: 36197317 DOI: 10.1021/acs.orglett.2c02942] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An oxidant dependent switchable palladium-catalyzed synthesis of 1,3-oxazines and benzohydrazonates (azines) from O-homoallyl benzimidates has been developed. The reaction involved aza-Wacker-type intramolecular cyclization of O-homoallyl benzimidates with Cu(OAc)2 as oxidant under Pd-catalysis to deliver 4-methylene-1,3-oxazines, whereas dimerization of O-homoallyl benzimidates with K2S2O8 as oxidant resulted remarkably in benzohydrazonates (azines). The reaction is atom economic with an easily operational procedure for divergent synthesis of important scaffolds.
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Affiliation(s)
- Rodney A Fernandes
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra, India
| | - Ashvin J Gangani
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra, India
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2
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Zhao Q, Yao Q, Dou T, Xu T, Zhang J, Chen X. Catalysts Based on the C−H⋅⋅⋅M Weak Interaction: Synthesis, Characterization and Catalytic Application of Bis(pyrazolyl)borate Cu(I) Complexes in Carbene Insertion into Heteroatom Hydrogen Bonds. ChemistrySelect 2022. [DOI: 10.1002/slct.202200552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Qianyi Zhao
- School of Chemistry and Chemical Engineering Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials Key Laboratory of Green Chemical Media and Reactions Ministry of Education Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals Henan Normal University Xinxiang Henan 453007 China
| | - Qiu‐Yue Yao
- School of Chemistry and Chemical Engineering Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials Key Laboratory of Green Chemical Media and Reactions Ministry of Education Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals Henan Normal University Xinxiang Henan 453007 China
| | - Ting Dou
- School of Chemistry and Chemical Engineering Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials Key Laboratory of Green Chemical Media and Reactions Ministry of Education Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals Henan Normal University Xinxiang Henan 453007 China
| | - Ting Xu
- School of Chemistry and Chemical Engineering Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials Key Laboratory of Green Chemical Media and Reactions Ministry of Education Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals Henan Normal University Xinxiang Henan 453007 China
| | - Jie Zhang
- School of Chemistry and Chemical Engineering Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials Key Laboratory of Green Chemical Media and Reactions Ministry of Education Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals Henan Normal University Xinxiang Henan 453007 China
| | - Xuenian Chen
- School of Chemistry and Chemical Engineering Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials Key Laboratory of Green Chemical Media and Reactions Ministry of Education Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals Henan Normal University Xinxiang Henan 453007 China
- College of Chemistry and Molecular Engineering Zhengzhou University Zhengzhou Henan 450001 China
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3
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Pollack SR, Dion A. Metal-Free Stereoselective Synthesis of ( E)- and ( Z)-N-Monosubstituted β-Aminoacrylates via Condensation Reactions of Carbamates. J Org Chem 2021; 86:11748-11762. [PMID: 34479408 DOI: 10.1021/acs.joc.1c01212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
N-monosubstituted β-aminoacrylates are building blocks, which have been used in the preparation of amino acids and pharmaceuticals. Two efficient, stereoselective methods of preparation, via acid- or base-promoted condensation reactions of carbamates, are described. The base-promoted reaction is E-selective, while acid catalysis can, through the choice of solvent, selectively form E or Z. The acid-catalyzed E-selective process proceeds through a crystallization obviating the need for chromatographic purification.
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Affiliation(s)
- Scott R Pollack
- Department of Process Research & Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Amélie Dion
- Department of Process Research & Development, MRL, Merck & Co., Inc., Rahway, New Jersey 07065, United States
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4
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Baghel AS, Aghi A, Kumar A. Ru(II)-Catalyzed Controlled Cross-Dehydrogenative Coupling of Benzamides with Activated Olefins via Weakly Coordinating Primary Amides. J Org Chem 2021; 86:9744-9754. [PMID: 34196566 DOI: 10.1021/acs.joc.1c01090] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Ru(II)-catalyzed regioselective ortho-alkenylation of primary benzamides with activated olefins has been realized over the competitive cyclized products. This reaction overall proceeds via a cross-dehydrogenative coupling (CDC) reaction using a simple and weakly coordinating primary amide group in the presence of an inexpensive Ru(II) salt and allows the controlled introduction of olefin motifs at the ortho-position of benzamides. The key to the success of this strategy depends on fine-tuning the reaction conditions. The developed protocol has demonstrated excellent regio/diastereoselectivity and a good functional group tolerance with wide substrate scope and obviates the requirement of external auxiliaries as well as the costly metal catalyst. Detailed mechanistic studies indicate the involvement of the base-assisted internal electrophilic-type substitution (BIES) step in the reaction mechanism.
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Affiliation(s)
- Akanksha Singh Baghel
- Department of Chemistry, Indian Institute of Technology Patna, Bihta, Bihar 801106, India
| | - Anjali Aghi
- Department of Chemistry, Indian Institute of Technology Patna, Bihta, Bihar 801106, India
| | - Amit Kumar
- Department of Chemistry, Indian Institute of Technology Patna, Bihta, Bihar 801106, India
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5
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Ayushee, Patel M, Meena P, Jahan K, Bharatam PV, Verma AK. Base-Mediated Anti-Markovnikov Hydroamidation of Vinyl Arenes with Arylamides. Org Lett 2021; 23:565-570. [PMID: 33393787 DOI: 10.1021/acs.orglett.0c04084] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We investigated a base-promoted protocol for the intermolecular anti-Markovnikov hydroamidation of vinyl arenes with arylamides to furnish the arylethylbenzamides with excellent chemo- and regioselectivity. The reaction tolerates an extensive variety of functional groups and has been successfully extended with electronically varied handles, aminobenzamides, electron-rich/electron-deficient heterocyclic amides, and vinyl arenes to afford the hydroamidated products. Excellent chemoselectivity was observed for the amide group over amine. The proposed mechanism and vital role of the solvent was well supported by deuterium labeling studies and control experiments.
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Affiliation(s)
- Ayushee
- Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Monika Patel
- Ramjas College, Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Priyanka Meena
- Department of Chemistry, University of Delhi, Delhi 110007, India
| | - Kousar Jahan
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER) S.A.S. Nagar, Mohali 160062, Punjab, India
| | - Prasad V Bharatam
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER) S.A.S. Nagar, Mohali 160062, Punjab, India
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6
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Surgenor RR, Grote AC, McGeough C, Narayanan A, Wang W, Collier PN. Convergent and Stereoselective Method for the Synthesis of Acyclic α-Chloroenamides. J Org Chem 2020; 85:14158-14165. [PMID: 33045836 DOI: 10.1021/acs.joc.0c01370] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A direct, stereocontrolled synthesis of acyclic α-chloroenamides is presented. Our methodology showed good yields and substrate scope. Mechanistic insights are provided that account for the high levels of stereoselectivity reported. Subsequent synthetic manipulation of the α-chloroenamides provides direct entry to polyfunctionalized acyclic enamides, compounds of wide use in organic chemistry and the pharmaceutical industry.
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Affiliation(s)
- Richard R Surgenor
- Vertex Pharmaceuticals Incorporated, 50 Northern Avenue, Boston, Massachusetts 02210, United States
| | - Andrea C Grote
- Vertex Pharmaceuticals Incorporated, 50 Northern Avenue, Boston, Massachusetts 02210, United States
| | - Catherine McGeough
- Vertex Pharmaceuticals Incorporated, 50 Northern Avenue, Boston, Massachusetts 02210, United States
| | - Arjun Narayanan
- Vertex Pharmaceuticals Incorporated, 50 Northern Avenue, Boston, Massachusetts 02210, United States
| | - Wenyu Wang
- Vertex Pharmaceuticals Incorporated, 50 Northern Avenue, Boston, Massachusetts 02210, United States
| | - Philip N Collier
- Vertex Pharmaceuticals Incorporated, 50 Northern Avenue, Boston, Massachusetts 02210, United States
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7
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Jillella R, Raju S, Hsiao HC, Hsu DS, Chuang SC. Pd-Catalyzed Redox-Neutral C–N Coupling Reaction of Iminoquinones with Electron-Deficient Alkenes without External Oxidants: Access of Tertiary ( E)-Enamines and Application to the Synthesis of Indoles and Quinolin-4-ones. Org Lett 2020; 22:6252-6256. [DOI: 10.1021/acs.orglett.0c01929] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Raveendra Jillella
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Selvam Raju
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Huan-Chang Hsiao
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu 30010, Taiwan
| | - Day-Shin Hsu
- Department of Chemistry and Biochemistry, National Chung Cheng University, Chiayi 62102, Taiwan
| | - Shih-Ching Chuang
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu 30010, Taiwan
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8
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Zhang X, Wang Y, Alduma AL, Arif S. H U, Wang X, Quan Z. Selenium‐Mediated Cyclization Reaction of 2‐Vinylanilines with/without Isonitriles: Efficient Synthesis of 2‐Aminoquinoline/ 3‐Aryl‐1
H
‐indole Derivatives. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.202000119] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Xi Zhang
- Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional MaterialsCollege of Chemistry and Chemical EngineeringNorthwest Normal University Lanzhou Gansu 730070 People's Republic of China
| | - Yong‐Qing Wang
- Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional MaterialsCollege of Chemistry and Chemical EngineeringNorthwest Normal University Lanzhou Gansu 730070 People's Republic of China
| | - Anwar L. Alduma
- Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional MaterialsCollege of Chemistry and Chemical EngineeringNorthwest Normal University Lanzhou Gansu 730070 People's Republic of China
| | - Ullah Arif S. H
- Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional MaterialsCollege of Chemistry and Chemical EngineeringNorthwest Normal University Lanzhou Gansu 730070 People's Republic of China
| | - Xi‐Cun Wang
- Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional MaterialsCollege of Chemistry and Chemical EngineeringNorthwest Normal University Lanzhou Gansu 730070 People's Republic of China
| | - Zheng‐Jun Quan
- Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional MaterialsCollege of Chemistry and Chemical EngineeringNorthwest Normal University Lanzhou Gansu 730070 People's Republic of China
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9
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Cai X, Yang M, Guo H. Tertiary Enamides: Versatile and Available Substrates in Synthetic Chemistry. Curr Org Synth 2020; 16:70-97. [PMID: 31965923 DOI: 10.2174/1570179415666181107122814] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Revised: 09/29/2018] [Accepted: 10/03/2018] [Indexed: 12/31/2022]
Abstract
BACKGROUND Enamines and their variant enamides as powerful and versatile synthons have attracted great attention in synthetic chemistry. Enamides display unique stability and reduce enaminic reactivity in view of the electron-withdrawing effect of N-acyl group. A great deal of satisfactory achievements in the synthesis and application of enamides has been made in recent years. Especially, tertiary enamides without N-H bond regarded as low reactivity of compounds in the past can act as excellent nucleophiles to react with electrophiles for the construction of various nitrous molecules. OBJECTIVE This review focuses on recent advances on tertiary enamides in the synthetic strategies and applications including addition, coupling reaction, functionalization and electro- or photo-chemical reaction. CONCLUSION Tertiary enamides as electron-deficient nucleophiles display a satisfactory balance between stability and reactivity to offer multiple opportunities for the construction of various functionalized nitrogencontaining compounds. Further exploration of the reactive mechanisms involved tertiary enamides and the development of novel and efficient transformations to generate ever more complex building blocks starting from tertiary enamides are particularly worth pursuing.
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Affiliation(s)
- Xiaohua Cai
- School of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China
| | - Mengzhi Yang
- School of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China
| | - Hui Guo
- School of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou 310014, China
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10
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Mechanism and stereospecificity of Z-enamide synthesis from salicylaldehydes with isoxazoles using DFT calculations. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2019.120981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Pal CK, Sahu S, Sahu RK, Singh RK, Jena AK. Magnetically recyclable palladium nanoparticles (Fe
3
O
4
‐Pd) for oxidative coupling between amides and olefins at room temperature. Appl Organomet Chem 2019. [DOI: 10.1002/aoc.4985] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Chandan Kumar Pal
- Organic Synthesis and Nanocatalysis Laboratory, Department of ChemistryNorth Orissa University Baripada 757003 Odisha India
| | - Swagatika Sahu
- Organic Synthesis and Nanocatalysis Laboratory, Department of ChemistryNorth Orissa University Baripada 757003 Odisha India
- Betnoti College Betnoti 757025 Odisha India
| | | | - Rajesh Kumar Singh
- Organic Synthesis and Nanocatalysis Laboratory, Department of ChemistryNorth Orissa University Baripada 757003 Odisha India
| | - Ashis Kumar Jena
- Organic Synthesis and Nanocatalysis Laboratory, Department of ChemistryNorth Orissa University Baripada 757003 Odisha India
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12
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Mahmudov KT, Gurbanov AV, Guseinov FI, Guedes da Silva MFC. Noncovalent interactions in metal complex catalysis. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.02.011] [Citation(s) in RCA: 151] [Impact Index Per Article: 30.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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13
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Debbarma S, Bera SS, Maji MS. Harnessing Stereospecific Z-Enamides through Silver-Free Cp*Rh(III) Catalysis by Using Isoxazoles as Masked Electrophiles. Org Lett 2019; 21:835-839. [DOI: 10.1021/acs.orglett.8b04130] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Suvankar Debbarma
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Sourav Sekhar Bera
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Modhu Sudan Maji
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
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14
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C. Boruah R, S. Nongthombam G. Divergent Synthesis of Steroid Analogs from Steroidal β-Formylenamides, Conjugated Enones and β-Formylvinyl Halides. HETEROCYCLES 2019. [DOI: 10.3987/rev-18-898] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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15
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Panda N, Sahoo K. Synthesis of 4‐Alkenyl Benzoxazoles via Pd‐catalyzed
ortho
C−H Functionalization of 2‐Amidophenols. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201801272] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Niranjan Panda
- Department of ChemistryNational Institute of Technology Rourkela Odisha- 769008 India
| | - Kanchanbala Sahoo
- Department of ChemistryNational Institute of Technology Rourkela Odisha- 769008 India
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16
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17
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Wang WS, Chen P, Tang Y. Regioselective TfOH-mediated hydroamidation of ynamides with nitriles. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.03.060] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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18
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19
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Yang R, Yu JT, Sun S, Zheng Q, Cheng J. Copper-mediated intramolecular aza-Wacker-type cyclization of 2-alkenylanilines toward 3-aryl indoles. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2016.12.053] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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20
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Panda N, Yadav SA, Giri S. Palladium-Catalyzed Oxidative Sulfamidation: A Stereoselective Synthesis for Enesulfonamides. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201601048] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Niranjan Panda
- Department of Chemistry; National Institute of Technology Rourkela; Odisha 769008 India
| | | | - Santanab Giri
- Department of Chemistry; National Institute of Technology Rourkela; Odisha 769008 India
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21
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Delforge A, Georgiou I, Kremer A, Wouters J, Bonifazi D. Synthesis of Tertiary Enamides by Ag2CO3-Promoted Pd-Catalyzed Alkenylation of Acyclic Secondary Amides. Org Lett 2016; 18:4844-4847. [DOI: 10.1021/acs.orglett.6b02305] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Arnaud Delforge
- Namur
Research College and Department of Chemistry, University of Namur, Rue de Bruxelles 61, B-5000 Namur, Belgium
| | - Irene Georgiou
- Namur
Research College and Department of Chemistry, University of Namur, Rue de Bruxelles 61, B-5000 Namur, Belgium
| | - Adrian Kremer
- Namur
Research College and Department of Chemistry, University of Namur, Rue de Bruxelles 61, B-5000 Namur, Belgium
| | - Johan Wouters
- Namur
Research College and Department of Chemistry, University of Namur, Rue de Bruxelles 61, B-5000 Namur, Belgium
| | - Davide Bonifazi
- Namur
Research College and Department of Chemistry, University of Namur, Rue de Bruxelles 61, B-5000 Namur, Belgium
- School
of Chemistry, Cardiff University, Park Place, Main Building, CF10 3AT Cardiff, U.K
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22
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Xing L, Li C. Stereoselective Chlorination and Bromination of Enamides and Enamines via an Electrostatic Attraction Effect Using (1,1-Diacetoxyiodo)benzene and a Halide Source. J Org Chem 2015; 80:10000-8. [DOI: 10.1021/acs.joc.5b01603] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Linlin Xing
- Department of Chemistry,
School of Science, Tianjin University, Tianjin 300072, China
| | - Chunbao Li
- Department of Chemistry,
School of Science, Tianjin University, Tianjin 300072, China
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23
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Hu H, Tian J, Liu Y, Liu Y, Shi F, Wang X, Kan Y, Wang C. Aza-Wacker-type reaction between electron-deficient olefins and N-alkylsulfonamides. J Org Chem 2015; 80:2842-7. [PMID: 25679544 DOI: 10.1021/jo502823m] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A palladium-catalyzed oxidative amination protocol of electron-deficient olefins by aza-Wacker-type reaction with N-alkylsulfonamides was developed. The presence of the stoichiometric amount of methanesulfonic acid was crucial for the success of this transformation. The reactions were conducted in green solvent under mild conditions and scalable with excellent E-type stereoselectivity. In addition, a Pd(II)/Pd(0) catalytic cycle with the existence of a very strong oxidant (Selectfluor) was proposed.
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Affiliation(s)
- Huayou Hu
- Jiangsu Key Laboratory for Chemistry of Low-Dimensional Materials, School of Chemistry and Chemical Engineering, Huaiyin Normal University , Huaian 223300, P. R. China
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24
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Huang L, Arndt M, Gooßen K, Heydt H, Gooßen LJ. Late Transition Metal-Catalyzed Hydroamination and Hydroamidation. Chem Rev 2015; 115:2596-697. [DOI: 10.1021/cr300389u] [Citation(s) in RCA: 739] [Impact Index Per Article: 82.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Liangbin Huang
- Department of Chemistry, TU Kaiserslautern, Erwin-Schrödinger-Strasse Geb. 54, 67663 Kaiserslautern, Germany
| | - Matthias Arndt
- Department of Chemistry, TU Kaiserslautern, Erwin-Schrödinger-Strasse Geb. 54, 67663 Kaiserslautern, Germany
| | - Käthe Gooßen
- Department of Chemistry, TU Kaiserslautern, Erwin-Schrödinger-Strasse Geb. 54, 67663 Kaiserslautern, Germany
| | - Heinrich Heydt
- Department of Chemistry, TU Kaiserslautern, Erwin-Schrödinger-Strasse Geb. 54, 67663 Kaiserslautern, Germany
| | - Lukas J. Gooßen
- Department of Chemistry, TU Kaiserslautern, Erwin-Schrödinger-Strasse Geb. 54, 67663 Kaiserslautern, Germany
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25
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Yan Z, Xu Y, Tian W. A new and concise way to enamides by fluoroalkanosulfonyl fluoride mediated Beckmann rearrangement of α,β-unsaturated ketoximes. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.10.154] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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26
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Zhao MN, Lian XL, Ren ZH, Wang YY, Guan ZH. Palladium-Catalyzed Oxidative Amination of Activated Olefins with N-Alkyl Anilines for Synthesis of Tertiary (E)-Enamines. RSC Adv 2014. [DOI: 10.1039/c4ra11543k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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27
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Gogoi J, Gogoi P, Boruah RC. One-Pot Stereoselective Synthesis of (Z)-β-Ketoenamides from β-Halo α,β-Unsaturated Aldehydes. European J Org Chem 2014. [DOI: 10.1002/ejoc.201400007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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28
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Abstract
2,5- and 2,4,5-substituted oxazoles were prepared in one-pot by the NBS/Me2S-mediated cyclization of enamides in the presence of base.
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Affiliation(s)
- Niranjan Panda
- Department of Chemistry
- National Institute of Technology
- Rourkela-769008, India
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29
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Ji X, Huang H, Wu W, Li X, Jiang H. Palladium-Catalyzed Oxidative Coupling of Aromatic Primary Amines and Alkenes under Molecular Oxygen: Stereoselective Assembly of (Z)-Enamines. J Org Chem 2013; 78:11155-62. [DOI: 10.1021/jo402117r] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Xiaochen Ji
- School
of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Huawen Huang
- School
of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Wanqing Wu
- School
of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Xianwei Li
- School
of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Huanfeng Jiang
- School
of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
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Panda N, Mothkuri R, Pal A, Paital AR. Copper-Catalyzed Synthesis of α-Naphthols from Enol Esters. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201300503] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Chen S, Zheng K, Chen F. Palladium–copper-catalyzed desulfitative amination of benzo[d]oxazole C–H bond. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.09.044] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Panda N, Mothkuri R. Stereoselective synthesis of enamides by Pd-catalyzed hydroamidation of electron deficient terminal alkynes. J Org Chem 2012; 77:9407-12. [PMID: 22978456 DOI: 10.1021/jo301772f] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Hydroamidation of electron-deficient terminal alkynes by amides in presence of Pd-catalyst has been exploited for the stereoselective synthesis of Z-enamides. The possible intramolecular hydrogen bonding between the amido proton and carbonyl oxygen of ester group provides the extra stability to the Z-isomer of vinyl-palladium complex, which subsequently undergoes protodepalladation and leads to the Z-enamide selectively. This process is found to be mild and operationally simple with broad substrate scope.
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Affiliation(s)
- Niranjan Panda
- Department of Chemistry, National Institute of Technology, Rourkela-769008, Odisha, India.
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