1
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Song W, Liu Y, Yan N, Wan JP. Tunable Key [3 + 2] and [2 + 1] Cycloaddition of Enaminones and α-Diazo Compounds for the Synthesis of Isomeric Isoxazoles: Metal-Controlled Selectivity. Org Lett 2023; 25:2139-2144. [PMID: 36946543 DOI: 10.1021/acs.orglett.3c00636] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2023]
Abstract
The three-component reactions of enaminones, α-diazo esters/ketones, and t-butyl nitrite (TBN) for the switchable synthesis of isomeric isoxazoles have been realized. The catalysis with Cu(II) salt provides 3,4-disubsituted isoxazoles via [3 + 2] cycloaddition. On the other hand, the catalysis of Ag(I) with identical substrates leads to isomeric isoxazoles with reversed C3 and C4 substitution based on a key [2 + 1] cycloaddition.
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Affiliation(s)
- Wenli Song
- National Engineering Research Center for Carbohydrate Synthesis, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, People's Republic of China
| | - Yunyun Liu
- National Engineering Research Center for Carbohydrate Synthesis, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, People's Republic of China
| | - Nan Yan
- National Engineering Research Center for Carbohydrate Synthesis, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, People's Republic of China
| | - Jie-Ping Wan
- National Engineering Research Center for Carbohydrate Synthesis, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, People's Republic of China
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2
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Gao H, Chen JY, Peng Z, Feng L, Tung CH, Wang W. Bioinspired Iron-Catalyzed Dehydration of Aldoximes to Nitriles: A General N-O Redox-Cleavage Method. J Org Chem 2022; 87:10848-10857. [PMID: 35914249 DOI: 10.1021/acs.joc.2c01122] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Inspired by OxdA that operates biocatalytic aldoxime dehydration, we have developed an efficient iron catalyst, Cp*Fe(1,2-Cy2PC6H4O) (1), which rapidly converts various aliphatic and aromatic aldoximes to nitriles with release of H2O at room temperature. The catalysis involves redox activation of the N-O bond by a 1e- transfer from the iron catalyst to the oxime. Such redox-mediated N-O cleavage was demonstrated by the isolation of a ferrous iminato intermediate from the reaction of the ketoxime substrate. This iron-catalyzed acceptorless dehydration approach represents a general method for the preparation of nitriles, and it also delivers salicylonitriles by catalyzing the Kemp elimination reaction.
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Affiliation(s)
- Hongjie Gao
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Jia-Yi Chen
- College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Zhiqiang Peng
- College of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Lei Feng
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Chen-Ho Tung
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
| | - Wenguang Wang
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China.,College of Chemistry, Beijing Normal University, Beijing 100875, 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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Okamura H, Yasuno Y, Nakayama A, Kumadaki K, Kitsuwa K, Ozawa K, Tamura Y, Yamamoto Y, Shinada T. Selective oxidation of alcohol- d 1 to aldehyde- d 1 using MnO 2. RSC Adv 2021; 11:28530-28534. [PMID: 35478564 PMCID: PMC9037989 DOI: 10.1039/d1ra05405h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Accepted: 08/16/2021] [Indexed: 12/28/2022] Open
Abstract
The selective oxidation of alcohol-d1 to prepare aldehyde-d1 was newly developed by means of NaBD4 reduction/activated MnO2 oxidation. Various aldehyde-d1 derivatives including aromatic and unsaturated aldehyde-d1 can be prepared with a high deuterium incorporation ratio (up to 98% D). Halogens (chloride, bromide, and iodide), alkene, alkyne, ester, nitro, and cyano groups in the substrates are tolerated under the mild conditions. A facile method for deutrium incorporation into aldehydes by mild reduction of NaBD4 of aldehydes and MnO2 oxidation (98% D) is disclosed.![]()
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Affiliation(s)
- Hironori Okamura
- Graduate School of Science, Osaka City University Sugimoto, Sumiyoshi Osaka 558-8585 Japan
| | - Yoko Yasuno
- Graduate School of Science, Osaka City University Sugimoto, Sumiyoshi Osaka 558-8585 Japan
| | - Atsushi Nakayama
- Graduate School of Science, Osaka City University Sugimoto, Sumiyoshi Osaka 558-8585 Japan
| | - Katsushi Kumadaki
- Graduate School of Science, Osaka City University Sugimoto, Sumiyoshi Osaka 558-8585 Japan
| | - Kohei Kitsuwa
- Graduate School of Science, Osaka City University Sugimoto, Sumiyoshi Osaka 558-8585 Japan
| | - Keita Ozawa
- Graduate School of Science, Osaka City University Sugimoto, Sumiyoshi Osaka 558-8585 Japan
| | - Yusaku Tamura
- Graduate School of Science, Osaka City University Sugimoto, Sumiyoshi Osaka 558-8585 Japan
| | - Yuki Yamamoto
- Graduate School of Science, Osaka City University Sugimoto, Sumiyoshi Osaka 558-8585 Japan
| | - Tetsuro Shinada
- Graduate School of Science, Osaka City University Sugimoto, Sumiyoshi Osaka 558-8585 Japan
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5
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Sadaphal VA, Liu RS. Gold-Catalyzed Synthesis of Diaza-hexatrienes Via Diazo Attack at Vinylgold Carbenes: An Easy Access to 1 H-Pyrazolo[4,3- b]pyridine-5-ones. Org Lett 2021; 23:5496-5500. [PMID: 34232046 DOI: 10.1021/acs.orglett.1c01835] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This work reports a gold-catalyzed stereoselective synthesis of highly substituted E-configured 2,3-diaza-1,3,5-hexatrienes using α-diazo nitriles and cyclopropene derivatives; such products arise from an atypical diazo attack of α-aryldiazo nitriles at vinylgold carbenes. For these 2,3-diaza-1,3,5-hexatrienes, we develop a novel anionic cyclization of derivatives of one family to form 1H-pyrazolo[4,3-b]pyridine-5-ones.
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Affiliation(s)
- Vikas Ashokrao Sadaphal
- Frontier Research Center of Matter Science and Technology, Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan, ROC
| | - Rai-Shung Liu
- Frontier Research Center of Matter Science and Technology, Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan, ROC
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6
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Luo J, Chen G, Chen S, Li Z, Zhao Y, Liu Y. One‐Pot Tandem Protocol for the Synthesis of 1,3‐Bis(β‐aminoacrylate)‐Substituted 2‐Mercaptoimidazole Scaffolds. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000789] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jian Luo
- School of Chemistry and Chemical EngineeringGuangzhou University Guangzhou 510006 China
| | - Guo‐Shu Chen
- School of Chemistry and Chemical EngineeringGuangzhou University Guangzhou 510006 China
| | - Shu‐Jie Chen
- School of Chemistry and Chemical EngineeringGuangzhou University Guangzhou 510006 China
| | - Zhao‐Dong Li
- Department of Applied Chemistry, College of Materials and EnergySouth China Agricultural University Guangzhou 510642 China)
| | - Yu‐Lei Zhao
- School of Chemistry and Chemical EngineeringQufu Normal University Jining Shi, Qufu 273165 China
| | - Yun‐Lin Liu
- School of Chemistry and Chemical EngineeringGuangzhou University Guangzhou 510006 China
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7
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Skaria M, More SA, Kuo T, Cheng M, Liu R. Gold‐Catalyzed Iminations of Terminal Propargyl Alcohols with Anthranils with Atypical Chemoselectivity for C(1)‐Additions and 1,2‐Carbon Migration. Chemistry 2020; 26:3600-3608. [DOI: 10.1002/chem.201905283] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Revised: 12/16/2019] [Indexed: 01/07/2023]
Affiliation(s)
- Manisha Skaria
- Frontier Research Centers of Fundamental and Applied Science of MatterDepartment of ChemistryNational Tsing-Hua University Hsinchu 30013 Taiwan
| | - Sayaji Arjun More
- Frontier Research Centers of Fundamental and Applied Science of MatterDepartment of ChemistryNational Tsing-Hua University Hsinchu 30013 Taiwan
| | - Tung‐Chun Kuo
- Department of ChemistryNational Cheng Kung University Tainan 701 Taiwan
| | - Mu‐Jeng Cheng
- Department of ChemistryNational Cheng Kung University Tainan 701 Taiwan
| | - Rai‐Shung Liu
- Frontier Research Centers of Fundamental and Applied Science of MatterDepartment of ChemistryNational Tsing-Hua University Hsinchu 30013 Taiwan
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8
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Yi X, Feng J, Huang F, Baell JB. Metal-free C-C, C-O, C-S and C-N bond formation enabled by SBA-15 supported TFMSA. Chem Commun (Camb) 2020; 56:1243-1246. [PMID: 31899462 DOI: 10.1039/c9cc08389h] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The construction of intermolecular C-C, C-O, C-S and C-N bonds between diazo compounds and acyclic and cyclic 1,3-dicarbonyl compounds, thiophenol and alkynes was developed by using TFMSA@SBA-15, thus providing a metal-free and eco-friendly platform for forging those chemical bonds.
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Affiliation(s)
- Xiangyan Yi
- School of Pharmaceutical Science, Nanjing Tech University, Nanjing, 211816, China
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9
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Wang H, Lian P, Zheng Y, Li J, Wan X. Cross coupling of sulfonyl radicals with silver-based carbenes: a simple approach to β-carbonyl arylsulfones. Org Biomol Chem 2020; 18:2163-2169. [DOI: 10.1039/d0ob00091d] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
A radical–carbene coupling reaction of sulfonyl radicals and silver-based carbenes has been well established, which provides an efficient approach to various β-carbonyl arylsulfones.
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Affiliation(s)
- Hanghang Wang
- Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
| | - Pengcheng Lian
- Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
| | - Yonggao Zheng
- Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
| | - Jingjing Li
- Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
| | - Xiaobing Wan
- Key Laboratory of Organic Synthesis of Jiangsu Province
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou 215123
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10
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Matouš P, Kadaník M, Timoracký M, Kuneš J, Maříková J, Růžička A, Kočovský P, Pour M. Nucleophile-assisted cyclization of β-propargylamino acrylic compounds catalyzed by gold( i): a rapid construction of multisubstituted tetrahydropyridines and their fused derivatives. Org Chem Front 2020. [DOI: 10.1039/d0qo00653j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A variety of medicinally important multisubstituted tetrahydropyridines, 4-aryl piperidines, isoquinolines and fused pyridines were prepared in 1–3 step sequences via nucleophile-assisted Au(i)-catalyzed cyclizations of easily available azaenynes.
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Affiliation(s)
- Petr Matouš
- Department of Organic and Bioorganic Chemistry
- Charles University
- Faculty of Pharmacy in Hradec Králové
- Hradec Králové 500 05
- Czech Republic
| | - Michal Kadaník
- Department of Organic and Bioorganic Chemistry
- Charles University
- Faculty of Pharmacy in Hradec Králové
- Hradec Králové 500 05
- Czech Republic
| | - Marek Timoracký
- Department of Organic and Bioorganic Chemistry
- Charles University
- Faculty of Pharmacy in Hradec Králové
- Hradec Králové 500 05
- Czech Republic
| | - Jiří Kuneš
- Department of Organic and Bioorganic Chemistry
- Charles University
- Faculty of Pharmacy in Hradec Králové
- Hradec Králové 500 05
- Czech Republic
| | - Jana Maříková
- Department of Organic and Bioorganic Chemistry
- Charles University
- Faculty of Pharmacy in Hradec Králové
- Hradec Králové 500 05
- Czech Republic
| | - Aleš Růžička
- Department of General and Inorganic Chemistry
- University of Pardubice
- Faculty of Chemical Technology
- 532 10 Pardubice
- Czech Republic
| | - Pavel Kočovský
- Department of Organic and Bioorganic Chemistry
- Charles University
- Faculty of Pharmacy in Hradec Králové
- Hradec Králové 500 05
- Czech Republic
| | - Milan Pour
- Department of Organic and Bioorganic Chemistry
- Charles University
- Faculty of Pharmacy in Hradec Králové
- Hradec Králové 500 05
- Czech Republic
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