1
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Lardy SW, Lerda VL, Schmidt VA. Polarity-Driven Thiyl Radical-Catalyzed Aerobic Debenzylation of Ethers and Amines. J Org Chem 2024. [PMID: 39380545 DOI: 10.1021/acs.joc.4c01796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/10/2024]
Abstract
We report the use of a strongly electrophilic thiyl radical derived from commercially available pentafluorothiophenol as a demonstration of highly chemoselective H atom abstraction from electron-rich and relatively weak benzylic C-H bonds adjacent to the O and N atoms. This approach enables the selective oxidative removal of benzyl and p-methoxybenzyl groups from amines and ethers under ambient aerobic conditions.
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Affiliation(s)
- Samuel W Lardy
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United States
| | - Victoria L Lerda
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United States
| | - Valerie A Schmidt
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, California 92093, United States
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2
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Constantinou CT, Gkizis PL, Lagopanagiotopoulou OTG, Skolia E, Nikitas NF, Triandafillidi I, Kokotos CG. Photochemical Aminochlorination of Alkenes without the Use of an External Catalyst. Chemistry 2023; 29:e202301268. [PMID: 37254681 DOI: 10.1002/chem.202301268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 05/25/2023] [Accepted: 05/30/2023] [Indexed: 06/01/2023]
Abstract
The niche field of photochemistry offers opportunities that are not found in "traditional" ground state chemical pathways. Aminochlorinated derivatives are an interesting family of 1,2-difunctionalised compounds that provide access to a variety of natural products and pharmaceutical active substances. A practical, catalyst-free chloroamination protocol is described herein, providing access to intermediates of great importance, utilising mild and photochemical reaction conditions (370 nm), where N-chlorosulfonamides are used as both nitrogen and chlorine sources. A wide variety of olefins, decorated with a plethora of functional groups, was tested providing excellent results (28 examples, 18-88 % yield). Mechanistic studies (UV-Vis, control experiments and quantum yield measurement) were also performed.
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Affiliation(s)
- Constantinos T Constantinou
- Laboratory of Organic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, 15771, Panepistimiopolis, Athens, Greece
| | - Petros L Gkizis
- Laboratory of Organic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, 15771, Panepistimiopolis, Athens, Greece
| | - Olga Thomais G Lagopanagiotopoulou
- Laboratory of Organic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, 15771, Panepistimiopolis, Athens, Greece
| | - Elpida Skolia
- Laboratory of Organic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, 15771, Panepistimiopolis, Athens, Greece
| | - Nikolaos F Nikitas
- Laboratory of Organic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, 15771, Panepistimiopolis, Athens, Greece
| | - Ierasia Triandafillidi
- Laboratory of Organic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, 15771, Panepistimiopolis, Athens, Greece
| | - Christoforos G Kokotos
- Laboratory of Organic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, 15771, Panepistimiopolis, Athens, Greece
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3
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Design of a Nanoscale Ni Catalyst for Debenzylation Reactions via Hydrogenative C–N Bond Cleavage. Catal Letters 2022. [DOI: 10.1007/s10562-022-04196-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
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4
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Darnowski MG, Lanosky TD, Paquette AR, Boddy CN. Synthesis of a Constitutional Isomer of Armeniaspirol A, Pseudoarmeniaspirol A, via Lewis Acid-Mediated Rearrangement. J Org Chem 2022; 87:15634-15643. [PMID: 36322913 DOI: 10.1021/acs.joc.2c02331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The natural product armeniaspirol possesses a unique spirocyclic N,O-ketal in an α,β-dichloro-α,β-unsaturated lactam scaffold that has proved challenging to synthesize. Herein, we characterize the oxidative chlorination of pyrrole-2-carboxylate derivatives that rapidly generates this scaffold. The scope of this oxidation was extended to a series of esters and amides. Pyrrole-2-ketones could not be converted into the lactam due to an oxidative fragmentation. This result was unexpected since chloro-armeniaspirol has been synthesized via oxidative chlorination of a pyrrole-2-ketone. Examination of this successful oxidation showed that the desired scaffold was accessed due to intramolecular trapping from the neighboring free phenol, preventing fragmentation. Using the product of methyl N-methyl pyrrole-2-carboxylate oxidation 7b, we attempted to access the natural product armeniaspirol 2; however, an unanticipated Lewis acid-mediated rearrangement led to formation of a constitutional isomer, pseudoarmeniaspirol A 1. A small panel of pseudoarmeniaspirol analogues was synthesized and evaluated for antibiotic activity, inhibition of the targets of armeniaspirol, ClpXP and ClpYQ, and protonophore activity. While pseudoarmeniaspirol shows antibiotic activity, it does not target ClpXP or ClpYQ and has less protonophore activity than the natural product.
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Affiliation(s)
- Michael G Darnowski
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON K1N 6N5 Canada
| | - Taylor D Lanosky
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON K1N 6N5 Canada
| | - André R Paquette
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON K1N 6N5 Canada
| | - Christopher N Boddy
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON K1N 6N5 Canada
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5
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Deprotection of benzyl-derived groups via photochemically mesolytic cleavage of C–N and C–O bonds. Chem 2022. [DOI: 10.1016/j.chempr.2022.11.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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6
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Shang F, Liu R, Lv M, Ma Y, Liu J, Zhou P, Zhang C, Han KL. Unraveling the Key Role of the Benzyl Group in the Synthesis of CL-20 Precursor HBIW. ACS OMEGA 2022; 7:21912-21924. [PMID: 35785301 PMCID: PMC9244930 DOI: 10.1021/acsomega.2c02161] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Accepted: 06/02/2022] [Indexed: 06/15/2023]
Abstract
As one of the most important energetic material molecules, hexanitrohexaazaisowurtzitane (CL-20) can only be synthesized using an amine with a benzyl group. Moreover, the reaction mechanism remains unexplored and the special role of the benzyl group has not been revealed. To address these issues, we perform an extensive theoretical study to investigate the synthesis mechanism of CL-20 precursor HBIW by employing density functional theory. Our calculated results demonstrate that the benzyl group can reduce the energy of the intermediate and the energy barrier of the rate-determining step due to the π-π stack interaction between two benzene rings of the benzyl group. For the first time, we revealed that the reactions can produce 16 intermediates with different chiralities during the formation of the first two side five-membered rings and only two of which can further form the bottom six-membered ring and finally obtain the product HBIW. The steric hindrance effect of the benzyl group leads to the formation of a higher-energy intermediate first, thereby providing an opportunity to correct the wrong chirality. All of these factors make the diimine with the benzyl group the most suitable reactant for the synthesis of CL-20.
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Affiliation(s)
- Fangjian Shang
- College
of Aeronautical Engineering, Binzhou University, Binzhou 256603, P. R. China
- Shandong
Engineering Research Center of Aeronautical Materials and Devices, Binzhou 256603, P. R. China
| | - Runze Liu
- Institute
of Molecular Sciences and Engineering, Shandong
University, Qingdao 266235, P. R. China
| | - Meiheng Lv
- College
of Science, Shenyang University of Chemical
Technology, Shenyang 110142, P. R. China
| | - Yinhua Ma
- Department
of Physics, Dalian Maritime University, Dalian 116026, P. R. China
| | - Jianyong Liu
- State
Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of
Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
- University
of Chinese Academy of Sciences, Beijing 100049, P. R.
China
| | - Panwang Zhou
- Institute
of Molecular Sciences and Engineering, Shandong
University, Qingdao 266235, P. R. China
| | - Chaoyang Zhang
- Institute
of Chemical Materials, China Academy of
Engineering Physics (CAEP), Mianyang 621900, P. R. China
| | - Ke-li Han
- State
Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of
Chemical Physics, Chinese Academy of Sciences, Dalian 116023, P. R. China
- Institute
of Molecular Sciences and Engineering, Shandong
University, Qingdao 266235, P. R. China
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7
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Sang D, Dong B, Liu Y, Tian J. Chemoselective Cleavage of Acylsulfonamides and Sulfonamides by Aluminum Halides. J Org Chem 2022; 87:3586-3595. [PMID: 35157468 DOI: 10.1021/acs.joc.1c03133] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The chemoselective cleavage of C-N bonds of amides, sulfonamides, and acylsulfonamides by aluminum halides is described. AlCl3 and AlI3 display complementary reactivities toward N-alkyl and N-acyl moieties. N-Alkylacylsulfonamides, secondary N-(tert-butyl)sulfonamides, and tertiary N-(tert-butyl)amides undergo N-dealkylation upon treatments with AlI3 generated in situ from aluminum and iodine in acetonitrile. In contrast, AlCl3 preferentially cleaves N-acyl groups of tertiary and secondary sulfonamides.
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Affiliation(s)
- Dayong Sang
- College of Chemical Engineering and Pharmacy, Jingchu University of Technology, Jingmen, Hubei 448000, P. R. China
| | - Bingqian Dong
- College of Chemical Engineering and Pharmacy, Jingchu University of Technology, Jingmen, Hubei 448000, P. R. China.,School of Chemical Engineering and Pharmacy, Wuhan Institute of Technology, Wuhan, Hubei 430205, P. R. China
| | - Yunfeng Liu
- College of Chemical Engineering and Pharmacy, Jingchu University of Technology, Jingmen, Hubei 448000, P. R. China
| | - Juan Tian
- College of Chemical Engineering and Pharmacy, Jingchu University of Technology, Jingmen, Hubei 448000, P. R. China
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8
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Li W, Yan F, Cai S, Ding L, Li B, Zhang B, Zhang Y, Zhu L. Platinum nanoparticles as recyclable heterogeneous catalyst for selective methylation of amines and imines with formic acid: Indirect utilization of CO2. JOURNAL OF SAUDI CHEMICAL SOCIETY 2022. [DOI: 10.1016/j.jscs.2022.101421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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9
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Lian P, Li R, Wang L, Wan X, Xiang Z, Wan X. Photoredox aerobic oxidation of unreactive amine derivatives through LMCT excitation of copper dichloride. Org Chem Front 2022. [DOI: 10.1039/d2qo01032a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Taking advantage of the chlorine radical as a HAT catalyst, a versatile oxidation system for unreactive amines has been well established.
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Affiliation(s)
- Pengcheng Lian
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
| | - Ruyi Li
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
| | - Lili Wang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
| | - Xiao Wan
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
| | - Zixin Xiang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
| | - Xiaobing Wan
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
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10
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Kim DS, Lee HG. Formation of the Tertiary Sulfonamide C(sp 3)-N Bond Using Alkyl Boronic Ester via Intramolecular and Intermolecular Copper-Catalyzed Oxidative Cross-Coupling. J Org Chem 2021; 86:17380-17394. [PMID: 34762422 DOI: 10.1021/acs.joc.1c01759] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A synthetic strategy for the formation of C(sp3)-N bonds, particularly through a copper-catalyzed oxidative cross-coupling, is rare. Herein, we report a novel synthetic approach for the preparation of tertiary sulfonamides via copper-catalyzed intra- and intermolecular oxidative C(sp3)-N cross-coupling reactions. This method allows the utilization of the readily available C(sp3)-based pinacol boronate as a substrate and the tolerance of a wide range of functional groups under mild reaction conditions. The success of this strategy relies on the unprecedented additive effects of silanol and NaIO4.
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Affiliation(s)
- Dong Sun Kim
- Department of Chemistry, College of National Science, Seoul National University, Gwanak-ro 1, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Hong Geun Lee
- Department of Chemistry, College of National Science, Seoul National University, Gwanak-ro 1, Gwanak-gu, Seoul 08826, Republic of Korea
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11
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Hamada S. [Oxidative Deprotection of p-Methoxybenzyl Ethers by a Nitroxyl Radical Catalyst]. YAKUGAKU ZASSHI 2021; 141:1147-1154. [PMID: 34602511 DOI: 10.1248/yakushi.21-00132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The oxidation of p-methoxybenzyl (PMB) ethers was achieved using a nitroxyl radical catalyst 1, which contains electron-withdrawing ester groups adjacent to the nitroxyl group. The oxidative deprotection of the PMB moieties on the hydroxy groups was observed upon treatment of 1 with one equivalent of the co-oxidant phenyl iodonium bis(trifluoroacetate) (PIFA). This system showed an excellent chemoselectivity profile for the deprotection of PMB ethers from a broad range of functional groups including diverse oxidation-sensitive moieties. The corresponding carbonyl compounds were obtained by treating the PMB-protected alcohols with 1 and an excess amount of PIFA.
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Affiliation(s)
- Shohei Hamada
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University
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12
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Bhattacharya A, Shukla PM, Maji B. Highly Selective and Catalytic C-N Bond Cleavage of Tertiary Sulfonamides: Scope and Mechanistic Insight. ACS OMEGA 2021; 6:18988-19005. [PMID: 34337238 PMCID: PMC8320137 DOI: 10.1021/acsomega.1c02276] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 07/06/2021] [Indexed: 06/13/2023]
Abstract
A highly chemoselective C-N bond cleavage reaction of p-methoxybenzyl- (PMB), 3,4-dimethoxybenzyl- (DMB), or cinnamyl-substituted tertiary sulfonamides in the presence of catalytic Bi(OTf)3 is presented. A wide range of sulfonamide substrates smoothly furnished the corresponding C-N bond cleavage products in good to excellent yields. Great efforts have been made to obtain insights into the reaction mechanism based on a series of control experiments and mass spectroscopy.
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13
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Pickford HD, Nugent J, Owen B, Mousseau JJ, Smith RC, Anderson EA. Twofold Radical-Based Synthesis of N, C-Difunctionalized Bicyclo[1.1.1]pentanes. J Am Chem Soc 2021; 143:9729-9736. [PMID: 34161076 DOI: 10.1021/jacs.1c04180] [Citation(s) in RCA: 41] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Bicyclo[1.1.1]pentylamines (BCPAs) are of growing importance to the pharmaceutical industry as sp3-rich bioisosteres of anilines and N-tert-butyl groups. Here we report a facile synthesis of 1,3-disubstituted BCPAs using a twofold radical functionalization strategy. Sulfonamidyl radicals, generated through fragmentation of α-iodoaziridines, undergo initial addition to [1.1.1]propellane to afford iodo-BCPAs; the newly formed C-I bond in these products is then functionalized via a silyl-mediated Giese reaction. This chemistry also translates smoothly to 1,3-disubstituted iodo-BCPs. A wide variety of radical acceptors and iodo-BCPAs are accommodated, providing straightforward access to an array of valuable aniline-like isosteres.
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Affiliation(s)
- Helena D Pickford
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Jeremy Nugent
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Benjamin Owen
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - James J Mousseau
- Pfizer Worldwide Research and Development, Eastern Point Road, Groton, Connecticut 06340, United States
| | - Russell C Smith
- Janssen PRD, 3210 Merryfield Row, San Diego, California 92121, United States
| | - Edward A Anderson
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
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14
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Fu Y, Wu Q, Du Z. Debenzylative Sulfonylation of Tertiary Benzylamines Promoted by Visible Light. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100144] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Ying Fu
- Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education College of Chemistry and Chemical Engineering Northwest Normal University Lanzhou 730070 China
| | - Qing‐Kui Wu
- Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education College of Chemistry and Chemical Engineering Northwest Normal University Lanzhou 730070 China
| | - Zhengyin Du
- Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education College of Chemistry and Chemical Engineering Northwest Normal University Lanzhou 730070 China
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15
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Liu P, Tung NT, Xu X, Yang J, Li F. N-Methylation of Amines with Methanol in the Presence of Carbonate Salt Catalyzed by a Metal-Ligand Bifunctional Ruthenium Catalyst [( p-cymene)Ru(2,2'-bpyO)(H 2O)]. J Org Chem 2021; 86:2621-2631. [PMID: 33502847 DOI: 10.1021/acs.joc.0c02685] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
A ruthenium complex [(p-cymene)Ru(2,2'-bpyO)(H2O)] was found to be a general and efficient catalyst for the N-methylation of amines with methanol in the presence of carbonate salt. Moreover, a series of sensitive substituents, such as nitro, ester, cyano, and vinyl groups, were tolerated under present conditions. It was confirmed that OH units in the ligand are crucial for the catalytic activity. Notably, this research exhibited the potential of metal-ligand bifunctional ruthenium catalysts for the hydrogen autotransfer process.
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Affiliation(s)
- Peng Liu
- School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210094, People's Republic of China
| | - Nguyen Thanh Tung
- School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210094, People's Republic of China
| | - Xiangchao Xu
- School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210094, People's Republic of China
| | - Jiazhi Yang
- School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210094, People's Republic of China
| | - Feng Li
- School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing 210094, People's Republic of China
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16
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Nishiguchi Y, Tomizuka A, Moriyama K. Formal Ring Contraction of Cyclic
N
‐Sulfonamides via C−N Bond Cleavage and α‐Amination by Oxidation of Halides. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202001034] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Yuna Nishiguchi
- Department of Chemistry Graduate School of Science and Soft Molecular Activation Research Center Chiba University 1-33 Yayoi-cho, Inage-ku Chiba 263-8522 Japan
| | - Akihiko Tomizuka
- Department of Chemistry Graduate School of Science and Soft Molecular Activation Research Center Chiba University 1-33 Yayoi-cho, Inage-ku Chiba 263-8522 Japan
| | - Katsuhiko Moriyama
- Department of Chemistry Graduate School of Science and Soft Molecular Activation Research Center Chiba University 1-33 Yayoi-cho, Inage-ku Chiba 263-8522 Japan
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17
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Hamada S, Sugimoto K, Elboray EE, Kawabata T, Furuta T. Chemoselective Oxidation of p-Methoxybenzyl Ethers by an Electronically Tuned Nitroxyl Radical Catalyst. Org Lett 2020; 22:5486-5490. [PMID: 32633536 DOI: 10.1021/acs.orglett.0c01839] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The oxidation of p-methoxy benzyl (PMB) ethers was achieved using nitroxyl radical catalyst 1, which contains electron-withdrawing ester groups adjacent to the nitroxyl group. The oxidative deprotection of the PMB moieties on the hydroxy groups was observed upon treatment of 1 with 1 equiv of the co-oxidant phenyl iodonium bis(trifluoroacetate) (PIFA). The corresponding carbonyl compounds were obtained by treating the PMB-protected alcohols with 1 and an excess of PIFA.
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Affiliation(s)
- Shohei Hamada
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
| | - Koichi Sugimoto
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
| | - Elghareeb E Elboray
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan.,Department of Chemistry, Faculty of Science, South Valley University, Qena, Egypt
| | - Takeo Kawabata
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Takumi Furuta
- Department of Pharmaceutical Chemistry, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8414, Japan
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18
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Aegurla B, Mandle RD, Shinde PG, Parit RS, Kamble SP, Sudalai A, Senthilkumar B. Triethyl Phosphite/Benzoyl Peroxide Mediated Reductive Dealkylation of
O
‐Benzoylhydroxylamines: A Cascade Synthesis of Secondary Amides. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000611] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Balakrishna Aegurla
- Chemical Engineering & Process Development Division CSIR‐National Chemical Laboratory Dr. Homi Bhabha Road ‐ 411008 Pune Maharashtra India
| | - Ram D. Mandle
- Chemical Engineering & Process Development Division CSIR‐National Chemical Laboratory Dr. Homi Bhabha Road ‐ 411008 Pune Maharashtra India
| | - Prasad G. Shinde
- Organic Chemistry Division CSIR‐National Chemical Laboratory Dr. Homi Bhabha Road ‐ 411008 Pune Maharashtra India
| | - Ratan S. Parit
- Organic Chemistry Division CSIR‐National Chemical Laboratory Dr. Homi Bhabha Road ‐ 411008 Pune Maharashtra India
| | - Sanjay P. Kamble
- Chemical Engineering & Process Development Division CSIR‐National Chemical Laboratory Dr. Homi Bhabha Road ‐ 411008 Pune Maharashtra India
| | - Arumugam Sudalai
- Chemical Engineering & Process Development Division CSIR‐National Chemical Laboratory Dr. Homi Bhabha Road ‐ 411008 Pune Maharashtra India
| | - Beeran Senthilkumar
- Organic Chemistry Division CSIR‐National Chemical Laboratory Dr. Homi Bhabha Road ‐ 411008 Pune Maharashtra India
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19
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Chung Leung GY, Ramalingam B, Loh G, Chen A. Efficient and Practical Synthesis of Sulfonamides Utilizing SO2 Gas Generated On Demand. Org Process Res Dev 2020. [DOI: 10.1021/acs.oprd.9b00552] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Gulice Yiu Chung Leung
- Agency for Science, Technology and Research (A*STAR), Institute of Chemical and Engineering Sciences, 8 Biomedical Grove, Neuros #07-01, 138665, Singapore
| | - Balamurugan Ramalingam
- Agency for Science, Technology and Research (A*STAR), Institute of Chemical and Engineering Sciences, 8 Biomedical Grove, Neuros #07-01, 138665, Singapore
| | - Gabriel Loh
- Agency for Science, Technology and Research (A*STAR), Institute of Chemical and Engineering Sciences, 8 Biomedical Grove, Neuros #07-01, 138665, Singapore
| | - Anqi Chen
- Agency for Science, Technology and Research (A*STAR), Institute of Chemical and Engineering Sciences, 8 Biomedical Grove, Neuros #07-01, 138665, Singapore
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20
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Yamamoto Y, Shimizu E, Ban K, Wada Y, Mizusaki T, Yoshimura M, Takagi Y, Sawama Y, Sajiki H. Facile Hydrogenative Deprotection of N-Benzyl Groups Using a Mixed Catalyst of Palladium and Niobic Acid-on-Carbon. ACS OMEGA 2020; 5:2699-2709. [PMID: 32095693 PMCID: PMC7033673 DOI: 10.1021/acsomega.9b03226] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Accepted: 01/21/2020] [Indexed: 05/12/2023]
Abstract
The palladium-on-carbon (Pd/C)-catalyzed hydrogenative deprotection of the N-benzyl-protecting group was effectively facilitated by the combined use of niobic acid-on-carbon (Nb2O5/C). Nb2O5/C is an acidic heterogeneous catalyst prepared from NbCl5 and activated carbon. The catalysts were easily removed from the reaction mixture and reusable. Deprotected amines were obtained in excellent yields without an additional neutralization process. The facilitating effect of Nb2O5/C was also observed during the Pd/C-catalyzed hydrogenative deprotection of the N-benzyloxycarbonyl (Cbz) and O-benzyl groups.
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Affiliation(s)
- Yuta Yamamoto
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical
University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Eisho Shimizu
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical
University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Kazuho Ban
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical
University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
| | - Yoshiyuki Wada
- Catalysts
Development Center, N. E. Chemcat Corporation, 25-3 Koshindaira, Bando, Ibaraki 306-0608, Japan
| | - Tomoteru Mizusaki
- Catalysts
Development Center, N. E. Chemcat Corporation, 25-3 Koshindaira, Bando, Ibaraki 306-0608, Japan
| | - Masatoshi Yoshimura
- Catalysts
Development Center, N. E. Chemcat Corporation, 678 Ipponmatsu, Numazu, Shizuoka 410-0314, Japan
| | - Yukio Takagi
- Catalysts
Development Center, N. E. Chemcat Corporation, 678 Ipponmatsu, Numazu, Shizuoka 410-0314, Japan
| | - Yoshinari Sawama
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical
University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
- E-mail: (Y.S.)
| | - Hironao Sajiki
- Laboratory
of Organic Chemistry, Gifu Pharmaceutical
University, 1-25-4 Daigaku-nishi, Gifu 501-1196, Japan
- E-mail: . Phone/Fax: (+81)-58-230-8109 (H.S.)
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21
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Yoshinaga T, Iwata T, Shindo M. Mild Environment-friendly Oxidative Debenzylation of N-Benzylanilines Using DMSO as an Oxidant. CHEM LETT 2020. [DOI: 10.1246/cl.190854] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Tatsuro Yoshinaga
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan
| | - Takayuki Iwata
- Institute for Materials Chemistry and Engineering, Kyushu University, Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan
| | - Mitsuru Shindo
- Institute for Materials Chemistry and Engineering, Kyushu University, Kasuga-koen, Kasuga, Fukuoka 816-8580, Japan
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22
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Chen D, Li J, Cui P, Shan Y, Zhao Y, Qiu G. Tandem Oxidative Radical Halogenated Addition of Alkynyl Imines: Regioselective Synthesis of 3-Haloquinolines. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901395] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Dianpeng Chen
- Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu Shandong China
| | - Jianming Li
- Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu Shandong China
| | - Peiying Cui
- Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu Shandong China
| | - Yingying Shan
- Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu Shandong China
| | - Yutong Zhao
- Chemistry and Chemical Engineering; Qufu Normal University; 273165 Qufu Shandong China
| | - Guanyinsheng Qiu
- College of Biological, Chemical Science and Engineering; Jiaxing University; 314001 Jiaxing Zhejiang China
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23
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Deng Z, Li GX, He G, Chen G. Photoredox-Mediated Remote C(sp 3)-H Heteroarylation of N-Alkyl Sulfonamides. J Org Chem 2019; 84:15777-15787. [PMID: 31804068 DOI: 10.1021/acs.joc.9b02502] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A Minisci-type δ-selective C(sp3)-H heteroarylation of sulfonyl-protected primary aliphatic amines with N-heteroarenes under photoredox-catalyzed conditions was developed. The reaction typically uses a slight excess of amine reactant. The use of benziodoxole acetate (BI-OAc) oxidant and hexafluoroisopropanol solvent is critical to achieve high yield. Besides methylene C-H bonds, heteroarylation reactions of δ methyl C-H bonds also worked under more forced conditions. The reactions show a broad scope for both amine and N-heteroarene substrates, offering a straightforward method for synthesis of complex δ-heteroarylalkylmines from simple precursors.
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Affiliation(s)
- Zhiqiang Deng
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry , Nankai University , Tianjin 300071 , China
| | - Guo-Xing Li
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry , Nankai University , Tianjin 300071 , China
| | - Gang He
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry , Nankai University , Tianjin 300071 , China
| | - Gong Chen
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry , Nankai University , Tianjin 300071 , China
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24
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Huang K, Li JN, Qiu G, Xie W, Liu JB. ZnBr 2/Oxone-mediated ipso-cyclization of N-(3-phenylprop-2-yn-1-yl)aniline. RSC Adv 2019; 9:33460-33464. [PMID: 35529126 PMCID: PMC9073544 DOI: 10.1039/c9ra06646b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Accepted: 10/12/2019] [Indexed: 11/21/2022] Open
Abstract
In this work, a selective synthetic strategy towards 1-azaspiro[4.5]deca-3,6,9-trien-8-ones from N-tosyl-N-(prop-2-yn-1-yl)aniline is developed. The transformation proceeds smoothly in a mixed solvent including acetonitrile and water when ZnBr2 and Oxone are employed. Mechanism studies show that the reaction proceeds in a regioselective manner via a radical ipso-cyclization pathway.
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Affiliation(s)
- Keke Huang
- School of Metallurgical and Chemical Engineering, Jiangxi University of Science and Technology 86 Hongqi Road Ganzhou 341000 China
| | - Jia-Ni Li
- College of Biological, Chemical Science and Engineering, Jiaxing University 118 Jiahang Road Jiaxing 314001 China
| | - Guanyinsheng Qiu
- College of Biological, Chemical Science and Engineering, Jiaxing University 118 Jiahang Road Jiaxing 314001 China
- Department of Chemistry, Fudan Unversity Shanghai 200438 China
| | - Wenlin Xie
- School of Chemistry and Chemical Engineering, Hunan University of Science and Technology Xiangtan 411201 China
| | - Jin-Biao Liu
- School of Metallurgical and Chemical Engineering, Jiangxi University of Science and Technology 86 Hongqi Road Ganzhou 341000 China
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25
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Phae-nok S, Pohmakotr M, Kuhakarn C, Reutrakul V, Soorukram D. Site-Specific Synthesis of β-Fluorinated γ-Butyrolactams via Decarboxylative Fluorination of β-Carboxyl-γ-Butyrolactams. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900685] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Supasorn Phae-nok
- Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC); Faculty of Science; Mahidol University; Rama VI Road 10400 Bangkok Thailand
| | - Manat Pohmakotr
- Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC); Faculty of Science; Mahidol University; Rama VI Road 10400 Bangkok Thailand
| | - Chutima Kuhakarn
- Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC); Faculty of Science; Mahidol University; Rama VI Road 10400 Bangkok Thailand
| | - Vichai Reutrakul
- Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC); Faculty of Science; Mahidol University; Rama VI Road 10400 Bangkok Thailand
| | - Darunee Soorukram
- Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH-CIC); Faculty of Science; Mahidol University; Rama VI Road 10400 Bangkok Thailand
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26
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TBAB-mediated radical 6-endo-trig ortho-cyclization of N-aryl-N-(prop-2-yn-1-yl)benzenesulfonamide for the synthesis of 3-bromo-1,2-dihydroquinoline. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.05.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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27
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Poeira DL, Macara J, Faustino H, Coelho JAS, Gois PMP, Marques MMB. Hypervalent Iodine Mediated Sulfonamide Synthesis. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900259] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Diogo L. Poeira
- LAQV@REQUIMTE; Departamento de Química; Faculdade de Ciências e Tecnologia; Universidade Nova de Lisboa; Campus de Caparica 2829-516 Caparica Portugal
| | - João Macara
- LAQV@REQUIMTE; Departamento de Química; Faculdade de Ciências e Tecnologia; Universidade Nova de Lisboa; Campus de Caparica 2829-516 Caparica Portugal
| | - Hélio Faustino
- Research Institute for Medicines (iMed.ULisboa); Faculty of Pharmacy; Universidade de Lisboa; Av. Prof. Gama Pinto 1649-003 Lisboa Portugal
| | - Jaime A. S. Coelho
- Research Institute for Medicines (iMed.ULisboa); Faculty of Pharmacy; Universidade de Lisboa; Av. Prof. Gama Pinto 1649-003 Lisboa Portugal
| | - Pedro M. P. Gois
- Research Institute for Medicines (iMed.ULisboa); Faculty of Pharmacy; Universidade de Lisboa; Av. Prof. Gama Pinto 1649-003 Lisboa Portugal
| | - M. Manuel B. Marques
- LAQV@REQUIMTE; Departamento de Química; Faculdade de Ciências e Tecnologia; Universidade Nova de Lisboa; Campus de Caparica 2829-516 Caparica Portugal
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28
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Yoon S, Kim SE, Kim JH, Yoon I, Tran PT, Ann J, Kim C, Byun WS, Lee S, Kim S, Lee J, Lee J. Structure-activity relationship of leucyladenylate sulfamate analogues as leucyl-tRNA synthetase (LRS)-targeting inhibitors of Mammalian target of rapamycin complex 1 (mTORC1). Bioorg Med Chem 2019; 27:1099-1109. [DOI: 10.1016/j.bmc.2019.01.037] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Revised: 01/16/2019] [Accepted: 01/29/2019] [Indexed: 11/29/2022]
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29
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Wang YH, Liu JB, Ouyang B, Zhou H, Qiu G. TBAI-mediated regioselective 5-exo-dig iodinative oxocyclization of 2-alkynylbenzamides for the synthesis of isobenzofuran-1-imines and isobenzofurans. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.07.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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30
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Haut FL, Speck K, Wildermuth R, Möller K, Mayer P, Magauer T. A Negishi cross-coupling reaction enables the total synthesis of (+)-stachyflin. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.02.048] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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31
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Wang RX, Yuan ST, Liu JB, Wu J, Qiu G. Regioselective 5-exo-dig oxy-cyclization of 2-alkynylbenzamide for the synthesis of isobenzofuran-1-imines and isobenzofuran. Org Biomol Chem 2018; 16:4501-4508. [DOI: 10.1039/c8ob00779a] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A TBAB-mediated regioselective radical cyclization of 2-alkynylbenzamide is described herein for the synthesis of isobenzofuran-1-imines. The reactions proceeded smoothly under mild conditions.
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Affiliation(s)
- Rui-Xiang Wang
- School of Metallurgical and Chemical Engineering
- Jiangxi University of Science and Technology
- Ganzhou 341000
- China
| | - Si-Tian Yuan
- School of Metallurgical and Chemical Engineering
- Jiangxi University of Science and Technology
- Ganzhou 341000
- China
- College of Biological
| | - Jin-Biao Liu
- School of Metallurgical and Chemical Engineering
- Jiangxi University of Science and Technology
- Ganzhou 341000
- China
| | - Jie Wu
- College of Biological
- Chemical Science and Engineering
- Jiaxing University
- Jiaxing 314001
- China
| | - Guanyinsheng Qiu
- College of Biological
- Chemical Science and Engineering
- Jiaxing University
- Jiaxing 314001
- China
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32
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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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33
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You T, Wang Z, Chen J, Xia Y. Transfer Hydro-dehalogenation of Organic Halides Catalyzed by Ruthenium(II) Complex. J Org Chem 2017; 82:1340-1346. [DOI: 10.1021/acs.joc.6b02222] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tingjie You
- College of Chemistry and
Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Zhenrong Wang
- College of Chemistry and
Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Jiajia Chen
- College of Chemistry and
Materials Engineering, Wenzhou University, Wenzhou 325035, China
| | - Yuanzhi Xia
- College of Chemistry and
Materials Engineering, Wenzhou University, Wenzhou 325035, China
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34
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Albano G, Evangelisti C, Aronica LA. Hydrogenolysis of Benzyl Protected Phenols and Aniline Promoted by Supported Palladium Nanoparticles. ChemistrySelect 2017. [DOI: 10.1002/slct.201601736] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Gianluigi Albano
- Dipartimento di Chimica e Chimica Industriale; Università di Pisa; Via Giuseppe Moruzzi 13 56124 Pisa Italy
| | - Claudio Evangelisti
- Consiglio Nazionale delle Ricerche; Istituto di Scienze e Tecnologie Molecolari (CNR-ISTM); Via Gaudenzio Fantoli 16/15 20138 Milano Italy
| | - Laura Antonella Aronica
- Dipartimento di Chimica e Chimica Industriale; Università di Pisa; Via Giuseppe Moruzzi 13 56124 Pisa Italy
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35
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Wezeman T, Comas-Barceló J, Nieger M, Harrity JPA, Bräse S. Synthesis of aminopyrazoles from sydnones and ynamides. Org Biomol Chem 2017; 15:1575-1579. [DOI: 10.1039/c6ob02518h] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Both copper-catalyzed and strain-mediated cycloadditions between ynamides and sydnones allow for a novel synthetic access to aminopyrazoles.
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Affiliation(s)
- T. Wezeman
- Institute of Organic Chemistry (IOC)
- Karlsruhe Institute of Technology (KIT)
- 76131 Karlsruhe
- Germany
| | | | - M. Nieger
- Department of Chemistry
- University of Helsinki
- Finland
| | | | - S. Bräse
- Institute of Organic Chemistry (IOC)
- Karlsruhe Institute of Technology (KIT)
- 76131 Karlsruhe
- Germany
- Institute of Toxicology and Genetics (ITG)
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36
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Qiu G, Li Y, Ma L, Zhou H. KBr/K2S2O8-mediated dibromohydration of N-(2-alkynylaryl)acetamide. Org Chem Front 2017. [DOI: 10.1039/c6qo00840b] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A neighbouring acetamino group-participated regioselective dibromohydration of N-(2-alkynylaryl)acetamide is described here for the synthesis of N-(2-(2,2-dibromo-2-arylacetyl)aryl)acetamide.
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Affiliation(s)
- Guanyinsheng Qiu
- College of Biological
- Chemical Science and Engineering
- Jiaxing University
- Jiaxing 314001
- China
| | - Yuewen Li
- College of Biological
- Chemical Science and Engineering
- Jiaxing University
- Jiaxing 314001
- China
| | - Lele Ma
- College of Biological
- Chemical Science and Engineering
- Jiaxing University
- Jiaxing 314001
- China
| | - Hongwei Zhou
- College of Biological
- Chemical Science and Engineering
- Jiaxing University
- Jiaxing 314001
- China
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37
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He Y, Qiu G. ZnBr2-Mediated oxidative spiro-bromocyclization of propiolamide for the synthesis of 3-bromo-1-azaspiro[4.5]deca-3,6,9-triene-2,8-dione. Org Biomol Chem 2017; 15:3485-3490. [DOI: 10.1039/c7ob00293a] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
ZnBr2-Mediated oxidative ipso-bromocyclization of N-arylpropoilamide was utilized herein for the synthesis of 3-bromo-1-azaspiro[4.5]deca-3,6,9-triene-2,8-dione with high efficiency and a broad tolerance for functional groups.
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Affiliation(s)
- Yicheng He
- College of Biological
- Chemical Science and Engineering
- Jiaxing University
- Jiaxing 314001
- China
| | - Guanyinsheng Qiu
- College of Biological
- Chemical Science and Engineering
- Jiaxing University
- Jiaxing 314001
- China
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38
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Moriyama K, Hamada T, Nakamura Y, Togo H. Catalytic dehydrogenative dual functionalization of ethers: dealkylation–oxidation–bromination accompanied by C–O bond cleavage via aerobic oxidation of bromide. Chem Commun (Camb) 2017; 53:6565-6568. [DOI: 10.1039/c7cc02166f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Catalytic dehydrogenative dual functionalization (DDF) of ethers via oxidation, dealkylation, and α-bromination by the aerobic oxidation of bromide was developed to obtain the corresponding α-bromo ketones in high yields.
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Affiliation(s)
- Katsuhiko Moriyama
- Department of Chemistry
- Graduate School of Science
- Chiba University
- Chiba 263-8522
- Japan
| | - Tsukasa Hamada
- Department of Chemistry
- Graduate School of Science
- Chiba University
- Chiba 263-8522
- Japan
| | - Yu Nakamura
- Department of Chemistry
- Graduate School of Science
- Chiba University
- Chiba 263-8522
- Japan
| | - Hideo Togo
- Department of Chemistry
- Graduate School of Science
- Chiba University
- Chiba 263-8522
- Japan
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39
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Urgoitia G, SanMartin R, Herrero MT, Domínguez E. Vanadium-Catalyzed Oxidative Debenzylation ofO-Benzyl Ethers at ppm Level. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201600593] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Garazi Urgoitia
- Department of Organic Chemistry II; Faculty of Science and Technology; University of the Basque Country (UPV/EHU); Sarriena auzoa z/g 48940 Leioa Spain
| | - Raul SanMartin
- Department of Organic Chemistry II; Faculty of Science and Technology; University of the Basque Country (UPV/EHU); Sarriena auzoa z/g 48940 Leioa Spain
| | - María Teresa Herrero
- Department of Organic Chemistry II; Faculty of Science and Technology; University of the Basque Country (UPV/EHU); Sarriena auzoa z/g 48940 Leioa Spain
| | - Esther Domínguez
- Department of Organic Chemistry II; Faculty of Science and Technology; University of the Basque Country (UPV/EHU); Sarriena auzoa z/g 48940 Leioa Spain
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40
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41
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Moriyama K, Nishinohara C, Togo H. Magnesium Lewis Acid Assisted Oxidative Bromoetherification Involving Bromine Transfer from Alkyl Bromides with Aldehydes by Umpolung of Bromide. Chemistry 2016; 22:11934-9. [PMID: 27304660 DOI: 10.1002/chem.201602055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Indexed: 11/11/2022]
Abstract
An oxidative bromoetherification involving a bromine transfer from alkyl bromides upon reacting them with aldehydes in a Grignard reaction with a concurrent oxidation of bromide was developed to provide substituted tetrahydrofurans in high yields. This reaction, which proceeds through two types of bromine transfer, was promoted by the addition of a Brønsted acid. Mechanistic studies suggested that a magnesium Lewis acid activates hypobromate, which is generated in situ from the reaction of bromide and Oxone to improve the electrophilicity of the bromonium ion (Br(+) ) for the oxidative bromoetherification of alkenyl alcohols. Furthermore, the magnesium Lewis acid catalyzed oxidative bromoetherification of an alkenyl alcohol proceeded to provide a cyclization product in 92 % yield.
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Affiliation(s)
- Katsuhiko Moriyama
- Department of Chemistry, Graduate School of Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan. .,Molecular Chirality Research Center, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan.
| | - Chihiro Nishinohara
- Department of Chemistry, Graduate School of Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan
| | - Hideo Togo
- Department of Chemistry, Graduate School of Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan.
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42
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Zhou L, Li X, Liu W, Zhao Y, Chen J. Cu(II)-catalyzed decarboxylation/elimination of N-arylsulfonyl amino acids to primary aryl sulfonamides. SYNTHETIC COMMUN 2016. [DOI: 10.1080/00397911.2016.1202981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Liandi Zhou
- Department of Chemistry, Jiangxi Normal University, Nanchang, China
| | - Xiaokang Li
- Department of Chemistry, Jiangxi Normal University, Nanchang, China
- Key Laboratory of Organo-pharmaceutical Chemistry, Gannan Normal University, Ganzhou, Jiangxi, China
| | - Wei Liu
- Department of Chemistry, Jiangxi Normal University, Nanchang, China
| | - Yongli Zhao
- Department of Chemistry, Jiangxi Normal University, Nanchang, China
| | - Junmin Chen
- Department of Chemistry, Jiangxi Normal University, Nanchang, China
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43
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Li Z, Tong R. Catalytic Environmentally Friendly Protocol for Achmatowicz Rearrangement. J Org Chem 2016; 81:4847-55. [DOI: 10.1021/acs.joc.6b00469] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Zhilong Li
- Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong, China
| | - Rongbiao Tong
- Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong, China
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44
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Wrigstedt P, Kavakka J, Heikkinen S, Nieger M, Räisänen M, Repo T. The Reactivity of Thymine and Thymidine 5,6-Epoxides with Organometallic Reagents - A Route to Thymidine (6-4) Photoproduct Analogues. J Org Chem 2016; 81:3848-59. [PMID: 27080560 DOI: 10.1021/acs.joc.6b00495] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
This report describes an efficient procedure for the generation and isolation of various thymine and thymidine 5,6-epoxides from the corresponding trans-5,6-bromohydrins by reaction with triethylamine. The quantitative isolation of the epoxides, accomplished by solvent precipitation of triethylamine hydrobromide, enabled their regiospecific ring-opening at C6 position by organometallic nucleophiles. The reaction was amenable to a broad range of alkyl, aryl, alkenyl, and alkynyl organomagnesium, -zinc, -aluminum, or -boron reagents, although the reactivity was strongly affected by the electronic effects of N3 protecting group. Additionally, the reaction featured excellent cis-diastereoselectivity providing access to C6-carbon-functionalized dihydrothymidine cis-alcohols, which are synthetic derivatives of UV-induced DNA lesions, namely, thymidine (6-4) photoproducts.
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Affiliation(s)
- Pauli Wrigstedt
- Department of Chemistry, †Laboratory of Inorganic Chemistry and ‡Laboratory of Organic Chemistry, University of Helsinki , P.O. Box 55, Helsinki FIN-00014, Finland
| | - Jari Kavakka
- Department of Chemistry, †Laboratory of Inorganic Chemistry and ‡Laboratory of Organic Chemistry, University of Helsinki , P.O. Box 55, Helsinki FIN-00014, Finland
| | - Sami Heikkinen
- Department of Chemistry, †Laboratory of Inorganic Chemistry and ‡Laboratory of Organic Chemistry, University of Helsinki , P.O. Box 55, Helsinki FIN-00014, Finland
| | - Martin Nieger
- Department of Chemistry, †Laboratory of Inorganic Chemistry and ‡Laboratory of Organic Chemistry, University of Helsinki , P.O. Box 55, Helsinki FIN-00014, Finland
| | - Minna Räisänen
- Department of Chemistry, †Laboratory of Inorganic Chemistry and ‡Laboratory of Organic Chemistry, University of Helsinki , P.O. Box 55, Helsinki FIN-00014, Finland
| | - Timo Repo
- Department of Chemistry, †Laboratory of Inorganic Chemistry and ‡Laboratory of Organic Chemistry, University of Helsinki , P.O. Box 55, Helsinki FIN-00014, Finland
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45
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Romero-Ibañez J, Xochicale-Santana L, Quintero L, Fuentes L, Sartillo-Piscil F. Synthesis of the Enantiomers of Tedanalactam and the First Total Synthesis and Configurational Assignment of (+)-Piplaroxide. JOURNAL OF NATURAL PRODUCTS 2016; 79:1174-1178. [PMID: 26913637 DOI: 10.1021/acs.jnatprod.5b01041] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Highlighting the recently established methodology for the direct synthesis of glycidic amides from tertiary allyl amines, the synthesis of the enantiomers of tedanalactam were completed in two steps from the corresponding chiral dihydropiperidine. Additionally, the (+)- and (-)-enantiomers of piplaroxide were obtained from their respective tedanalactam precursor, and the absolute configuration of the naturally occurring (+)-piplaroxide was determined. The present approach represents not only the shortest synthesis of (-)-tedanalactam but also the first total synthesis of (+)-piplaroxide, a repellent against the leafcutter ant Atta cephalotes.
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Affiliation(s)
- Julio Romero-Ibañez
- Centro de Investigación de la Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla (BUAP) , 14 Sur Esq. San Claudio, Colonia San Manuel, 72570 Puebla, México
| | - Leonardo Xochicale-Santana
- Centro de Investigación de la Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla (BUAP) , 14 Sur Esq. San Claudio, Colonia San Manuel, 72570 Puebla, México
| | - Leticia Quintero
- Centro de Investigación de la Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla (BUAP) , 14 Sur Esq. San Claudio, Colonia San Manuel, 72570 Puebla, México
| | - Lilia Fuentes
- Centro de Investigación de la Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla (BUAP) , 14 Sur Esq. San Claudio, Colonia San Manuel, 72570 Puebla, México
| | - Fernando Sartillo-Piscil
- Centro de Investigación de la Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla (BUAP) , 14 Sur Esq. San Claudio, Colonia San Manuel, 72570 Puebla, México
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46
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Pandey G, Khamrai J. Asymmetric Total Synthesis and Structural Elucidation of Unusual Oxindole Alkaloid Leucolusine. ASIAN J ORG CHEM 2016. [DOI: 10.1002/ajoc.201600101] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ganesh Pandey
- Molecular Synthesis and Drug Discovery Laboratory; Centre of Biomedical Research; SGPGIMS Campus Lucknow- 226014 India
| | - Jagadish Khamrai
- Molecular Synthesis and Drug Discovery Laboratory; Centre of Biomedical Research; SGPGIMS Campus Lucknow- 226014 India
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47
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Qiu G, Liu T, Ding Q. Tandem oxidative radical brominative addition of activated alkynes and spirocyclization: switchable synthesis of 3-bromocoumarins and 3-bromo spiro-[4,5] trienone. Org Chem Front 2016. [DOI: 10.1039/c6qo00041j] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A K2S2O8-mediated tandem radical brominative addition of alkynoates, oxidative spiro-cyclization, and 1,2-migration of esters is reported for the synthesis of 3-bromocoumarins with high efficiency.
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Affiliation(s)
- Guanyinsheng Qiu
- College of Biological
- Chemical Science and Engineering
- Jiaxing University
- Jiaxing 314001
- China
| | - Tong Liu
- College of Chemical and Engineering
- Jiangxi Normal University
- Nanchang 330013
- China
| | - Qiuping Ding
- College of Chemical and Engineering
- Jiangxi Normal University
- Nanchang 330013
- China
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48
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Efficient and practical approach to esters from acids/ 2-oxoacids/ 2-oxoaldehydes &/ 2-oxoesters. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.10.067] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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49
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Moriyama K, Sugiue T, Nishinohara C, Togo H. Divergent Synthesis of α,γ-Disubstituted γ-Butyrolactones through Diastereoselective Bromolactonization with Alkali Metal Bromide: Asymmetric Total Synthesis of (+)-Dubiusamine C. J Org Chem 2015; 80:9132-40. [PMID: 26313874 DOI: 10.1021/acs.joc.5b01497] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A divergent synthesis of α-substituted bromomethyl γ-lactones was developed, which involves the diastereoselective bromolactonization of α-substituted 4-pentenoic acids and 4-pentenamides via umpolung of bromide by use of alkali metal bromide and Oxone (potassium peroxymonosulfate mixture, 2KHSO5·KHSO4·K2SO4) to obtain mainly cis-products from α-substituted 4-pentenoic acids and trans-products from α-substituted 4-pentenamides, and it was found that the bromonium species generated from KBr and Oxone had higher activity than N-bromosuccinimide. Furthermore, the asymmetric total synthesis of (+)-dubiusamine C, which was isolated as a minor diastereomer from Pandanus dubius, was accomplished for the first time through the cis-selective bromolactonization of (S)-α-methyl-4-pentenoic acid in nine linear steps and 36% overall yield.
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Affiliation(s)
- Katsuhiko Moriyama
- Department of Chemistry, Graduate School of Science, Chiba University , 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
| | - Toru Sugiue
- Department of Chemistry, Graduate School of Science, Chiba University , 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
| | - Chihiro Nishinohara
- Department of Chemistry, Graduate School of Science, Chiba University , 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
| | - Hideo Togo
- Department of Chemistry, Graduate School of Science, Chiba University , 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
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50
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Shen Z, Chen M, Fang T, Li M, Mo W, Hu B, Sun N, Hu X. Transformation of ethers into aldehydes or ketones: a catalytic aerobic deprotection/oxidation pathway. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.04.033] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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