1
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Zhou Y, Akkarasereenon K, Liu L, Lin R, Song L, Tong R. Ecofriendly Protocol for ipso-Bromination of Arylboronic Acids. Org Lett 2024; 26:5151-5156. [PMID: 38864512 DOI: 10.1021/acs.orglett.4c01570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2024]
Abstract
We report a novel and environmentally friendly method for the ipso-bromination of arylboronic acids by exploiting the oxone/KBr system. We discovered that CuBr can catalyze the reaction and increase the yield from 63 to 97%. We believe that CuBr might catalyze the in situ generation of HOBr from oxone/KBr. The mild reaction condition permits tolerance of a diverse array of functional groups with exclusive regio- and chemoselectivity and allows low-cost large-scale reaction without explosion risk.
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Affiliation(s)
- Yiqin Zhou
- Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong 999077, China
| | - Kornkamon Akkarasereenon
- Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong 999077, China
| | - Lifang Liu
- Key Laboratory of Biopesticide and Chemical Biology (Ministry of Education), College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Ran Lin
- College of Bee Science and Biomedicine, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Liyan Song
- Key Laboratory of Biopesticide and Chemical Biology (Ministry of Education), College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Rongbiao Tong
- Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong 999077, China
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2
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Oku Y, Nakajima N, Hamada M, Koyama Y. Dansylated Nitrile N-Oxide as the Fluorescent Dye Clickable to Unsaturated Bonds without Catalyst. Chemistry 2024; 30:e202400092. [PMID: 38311590 DOI: 10.1002/chem.202400092] [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: 01/09/2024] [Revised: 02/02/2024] [Accepted: 02/04/2024] [Indexed: 02/06/2024]
Abstract
Fluorescent polymeric materials have been exploited in the fields of aesthetical purposes, biomedical engineering, and three-dimensional printing applications. While the fluorescent materials are prepared by the polymerization of fluorescent monomer or the blending a fluorescent dye with common polymer, the covalent immobilization of fluorescent dye onto common polymers is not the practical technique. In this paper, dansylated nitrile N-oxide (Dansyl-NO) has been designed and synthesized to be a stable nitrile N-oxide as the derivative of 2-hydroxy-1-naphthaldehyde. While Dansyl-NO shows good reactivity to an alkene and an alkyne to give fluorescent Dansyl-Ene and Dansyl-Yne, respectively, it hardly reacts to a nitrile. The results indicate that Dansyl-NO serves as a fluorescent dye clickable to alkenes and alkynes. To know the effects of solvent on the fluorescent properties, the UV-vis and fluorescence spectra of Dansyl-Ene are measured in three solvents. Dansyl-Ene shows fluorescent solvatochromism, which appears to be red-shifted along with the increase in solvent polarity. Poly(styrene-co-butadiene) directly reacts with Dansyl-NO to give fluorescent modified SB. The emission spectrum of modified SB is blue-shifted compared with that of Dansyl-Ene. The blue-shift could be possibly attributed to the presence of less polar polymer skeleton around the dansyl moieties of modified SB.
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Affiliation(s)
- Yuki Oku
- Department of Pharmaceutical Engineering, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0398, Japan
| | - Noriyuki Nakajima
- Department of Pharmaceutical Engineering, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0398, Japan
- Biotechnology Research Center, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0398, Japan
| | - Masahiro Hamada
- Department of Pharmaceutical Engineering, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0398, Japan
- Biotechnology Research Center, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0398, Japan
| | - Yasuhito Koyama
- Department of Pharmaceutical Engineering, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0398, Japan
- Biotechnology Research Center, Toyama Prefectural University, 5180 Kurokawa, Imizu, Toyama 939-0398, Japan
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3
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Liu Y, Cao J, Zhang M, Zhang Z, Xia C, Guo G, Wang F. Regioselective Cycloaddition of Alkenes with tert-butyl Nitrite: A Cascade Approach to the Formation of Δ 2-Isoxazolines. J Org Chem 2023; 88:15311-15317. [PMID: 37873929 DOI: 10.1021/acs.joc.3c01815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2023]
Abstract
A route for cycloaddition reaction of alkenes and tert-butyl nitrite to synthesize Δ2-isoxazolines has been developed. The overall process involves the formation of multiple chemical bonds without the use of a catalyst. This methodology features mild reaction conditions and good functional group tolerance, providing a direct approach for the preparation of isoxazolines.
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Affiliation(s)
- Yi Liu
- Pharmacy College, Institute of Pharmacology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan 250117, China
| | - Juan Cao
- Pharmacy College, Institute of Pharmacology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan 250117, China
| | - Mei Zhang
- Pharmacy College, Institute of Pharmacology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan 250117, China
| | - Zenghui Zhang
- Pharmacy College, Institute of Pharmacology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan 250117, China
| | - Chengcai Xia
- Pharmacy College, Institute of Pharmacology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan 250117, China
| | - Guili Guo
- Department of Biochemistry and Molecule Biology, School of Clinical and Basic Medical Sciences, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan 250117, China
| | - Fugang Wang
- Pharmacy College, Institute of Pharmacology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan 250117, China
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4
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Hochegger P, Hermann T, Dolensky J, Seebacher W, Saf R, Pferschy-Wenzig EM, Kaiser M, Mäser P, Weis R. Structure-Activity Relationships and Antiplasmodial Potencies of Novel 3,4-Disubstituted 1,2,5-Oxadiazoles. Int J Mol Sci 2023; 24:14480. [PMID: 37833929 PMCID: PMC10572347 DOI: 10.3390/ijms241914480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 09/20/2023] [Accepted: 09/21/2023] [Indexed: 10/15/2023] Open
Abstract
The 4-substituted 3-amino-1,2,5-oxadiazole 1 from the Malaria Box Project of the Medicines for Malaria Venture foundation shows very promising selectivity and in vitro activity against Plasmodium falciparum. Within the first series of new compounds, various 3-acylamino analogs were prepared. This paper now focuses on the investigation of the importance of the aromatic substituent in ring position 4. A number of new structure-activity relationships were elaborated, showing that antiplasmodial activity and selectivity strongly depend on the substitution pattern of the 4-phenyl moiety. In addition, physicochemical parameters relevant for drug development were calculated (logP and ligand efficiency) or determined experimentally (CYP3A4-inhibition and aqueous solubility). N-[4-(3-ethoxy-4-methoxyphenyl)-1,2,5-oxadiazol-3-yl]-3-methylbenzamide 51 showed high in vitro activity against the chloroquine-sensitive strain NF54 of P. falciparum (PfNF54 IC50 = 0.034 µM), resulting in a very promising selectivity index of 1526.
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Affiliation(s)
- Patrick Hochegger
- Institute of Pharmaceutical Sciences, Pharmaceutical Chemistry, University of Graz, Schubertstraße 1, A-8010 Graz, Austria; (P.H.); (J.D.); (W.S.); (R.W.)
| | - Theresa Hermann
- Institute of Pharmaceutical Sciences, Pharmaceutical Chemistry, University of Graz, Schubertstraße 1, A-8010 Graz, Austria; (P.H.); (J.D.); (W.S.); (R.W.)
| | - Johanna Dolensky
- Institute of Pharmaceutical Sciences, Pharmaceutical Chemistry, University of Graz, Schubertstraße 1, A-8010 Graz, Austria; (P.H.); (J.D.); (W.S.); (R.W.)
| | - Werner Seebacher
- Institute of Pharmaceutical Sciences, Pharmaceutical Chemistry, University of Graz, Schubertstraße 1, A-8010 Graz, Austria; (P.H.); (J.D.); (W.S.); (R.W.)
| | - Robert Saf
- Institute for Chemistry and Technology of Materials (ICTM), Graz University of Technology, Stremayrgasse 9, A-8010 Graz, Austria;
| | - Eva-Maria Pferschy-Wenzig
- Institute of Pharmaceutical Sciences, Pharmacognosy, University of Graz, Beethovenstraße 8, A-8010 Graz, Austria;
| | - Marcel Kaiser
- Swiss Tropical and Public Health Institute, Kreuzstraße 2, CH-4123 Allschwil, Switzerland; (M.K.); (P.M.)
- Faculty of Philosophy and Natural Sciences, University of Basel, Swiss TPH, Petersplatz 1, CH-4003 Basel, Switzerland
| | - Pascal Mäser
- Swiss Tropical and Public Health Institute, Kreuzstraße 2, CH-4123 Allschwil, Switzerland; (M.K.); (P.M.)
- Faculty of Philosophy and Natural Sciences, University of Basel, Swiss TPH, Petersplatz 1, CH-4003 Basel, Switzerland
| | - Robert Weis
- Institute of Pharmaceutical Sciences, Pharmaceutical Chemistry, University of Graz, Schubertstraße 1, A-8010 Graz, Austria; (P.H.); (J.D.); (W.S.); (R.W.)
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5
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Zheng T, Xu J, Cheng S, Ye J, Ma S, Tong R. Green Halogenation of Indoles with Oxone-Halide. J Org Chem 2023; 88:11497-11503. [PMID: 37499121 DOI: 10.1021/acs.joc.3c00638] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/29/2023]
Abstract
Oxidative functionalization of indoles is one of the most widely used approaches to exploit the synthetic utility of indoles. In continuation of our research interest in the green oxidation of indoles, we further explore the oxidation of indoles with oxone-halide and discover that the protecting group on the nitrogen of indoles plays a decisive role in controlling the pathways of indole oxidation with oxone-halide. An electron-withdrawing group on the nitrogen of indoles (N-EWG) enables C2 halogenation with stoichiometric halide, while C3 halogenation could be selectively achieved by using stoichiometric halide without dependence on the electronic property of the protecting group on the indole nitrogen. Different from our previous results obtained by using catalytic halide, these findings lead to the development of an environmentally friendly, efficient, and mild protocol for access to 2- or 3-haloindoles (chloro and bromo). As compared to the previous synthetic methods for 2-/3-haloindoles, our method exploits the in situ-generated reactive halogenating species from oxone-halide for halogenation of indoles and thus eliminates the use of stoichiometric halogenating agents and the production of toxic and hazardous organic byproducts derived from oxidants.
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Affiliation(s)
- Tao Zheng
- School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, China
| | - Jun Xu
- School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, China
| | - Shaojun Cheng
- School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, China
| | - Jianghai Ye
- School of Pharmacy, Guizhou University of Traditional Chinese Medicine, Guiyang 550025, China
| | - Shiqiang Ma
- Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon 999077, Hong Kong, China
| | - Rongbiao Tong
- Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon 999077, Hong Kong, China
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6
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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: 11] [Impact Index Per Article: 11.0] [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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7
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Song L, Zhou Y, Liang H, Li H, Lai Y, Yao H, Lin R, Tong R. Two Green Protocols for Halogenative Semipinacol Rearrangement. J Org Chem 2023; 88:504-512. [PMID: 36480595 DOI: 10.1021/acs.joc.2c02496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Semipinacol rearrangement is a special type of Wagner-Meerwein rearrangement that involves carbocation 1,2-rearrangement to provide carbonyl compounds with an α-quaternary carbon center. It has been strategically used for natural product synthesis and construction of highly congested quaternary carbons. Herein, we report a safe and green protocol that uses oxone/halide and Fenton bromide to achieve halogenative semipinacol rearrangement. The key feature of this method is the green in situ generation of reactive halogenating species from oxidation of halide with oxone or H2O2, which produces a nontoxic byproduct (potassium sulfate or water). Easy operation (insensitive to air and moisture) at room temperature without using special equipment adds additional advantage over previous methods.
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Affiliation(s)
- Liyan Song
- Key Laboratory of Biopesticide and Chemical Biology (Ministry of Education), College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Yiqin Zhou
- Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong 999077, China
| | - Hanbin Liang
- Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong 999077, China
| | - Hongzuo Li
- Key Laboratory of Biopesticide and Chemical Biology (Ministry of Education), College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Yunrong Lai
- Key Laboratory of Biopesticide and Chemical Biology (Ministry of Education), College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Hongliang Yao
- Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou, Guangdong 510275, China
| | - Ran Lin
- Key Laboratory of Biopesticide and Chemical Biology (Ministry of Education), College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
| | - Rongbiao Tong
- Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon, Hong Kong 999077, China.,Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou, Guangdong 510275, China
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8
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Shilova AN, Shatokhina NS, Kondrashov EV. Improved Synthesis of 5-(Chloromethyl)isoxazoles from Aldoximes and 2,3-Dichloropropene. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2022. [DOI: 10.1134/s1070428022100268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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9
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Advancements in the synthesis of oxazolines. MONATSHEFTE FUR CHEMIE 2022. [DOI: 10.1007/s00706-022-02976-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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10
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Fawzi M, Oubella A, Bimoussa A, Saadi M, Ammari LE, Ketatni EM, Morjani H, Aititto MY, Auhmani A. Diastereomerically Pure (S)‐
Verbenone‐Isoxazoline
Hybrids: Synthesis, Molecular Structure, Hirshfeld Surface Analysis,
DFT
, Cytotoxic Effect and Apoptosis Induction. J Heterocycl Chem 2022. [DOI: 10.1002/jhet.4573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Mourad Fawzi
- Laboratory of Molecular Chemistry, Unit of Organic Synthesis and Physico‐Molecular Chemistry, Department of Chemistry, Faculty of Sciences Semlalia, PO Box 2390 Marrakech Morocco
| | - Ali Oubella
- Laboratory of Molecular Chemistry, Unit of Organic Synthesis and Physico‐Molecular Chemistry, Department of Chemistry, Faculty of Sciences Semlalia, PO Box 2390 Marrakech Morocco
| | - Abdoullah Bimoussa
- Laboratory of Molecular Chemistry, Unit of Organic Synthesis and Physico‐Molecular Chemistry, Department of Chemistry, Faculty of Sciences Semlalia, PO Box 2390 Marrakech Morocco
| | - Mohamed Saadi
- Laboratoire de Chimie Appliquée des Matériaux, Centre des Sciences des Matériaux, Faculty of Science Mohammed V University in Rabat, Avenue Ibn Batouta, P.O Box 1014 Rabat Morocco
| | - Lahcen El Ammari
- Laboratoire de Chimie Appliquée des Matériaux, Centre des Sciences des Matériaux, Faculty of Science Mohammed V University in Rabat, Avenue Ibn Batouta, P.O Box 1014 Rabat Morocco
| | - El Mostafa Ketatni
- Laboratory of Molecular Chemistry, Materials and Catalysis, Faculty of Science and Technics Sultan Moulay Slimane University, PO Box 523, Beni‐Mellal Morocco
| | - Hamid Morjani
- Unité BioSpecT, EA7506, SFR CAP‐Santé, UFR de Pharmacie Université de Reims Champagne‐Ardenne France
| | - Moulay Youssef Aititto
- Laboratory of Molecular Chemistry, Unit of Organic Synthesis and Physico‐Molecular Chemistry, Department of Chemistry, Faculty of Sciences Semlalia, PO Box 2390 Marrakech Morocco
| | - Aziz Auhmani
- Laboratory of Molecular Chemistry, Unit of Organic Synthesis and Physico‐Molecular Chemistry, Department of Chemistry, Faculty of Sciences Semlalia, PO Box 2390 Marrakech Morocco
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11
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Liang L, Guo LD, Tong R. Achmatowicz Rearrangement-Inspired Development of Green Chemistry, Organic Methodology, and Total Synthesis of Natural Products. Acc Chem Res 2022; 55:2326-2340. [PMID: 35916456 DOI: 10.1021/acs.accounts.2c00358] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The six-membered heterocycles containing oxygen and nitrogen (tetrahydropyrans, pyrans, piperidines) are among the most common heterocyclic structures ubiquitously present in bioactive molecules such as carbohydrates, small-molecule drugs, and natural products. Chemical synthesis of fully functionalized pyrans and piperidines is a research theme of practical importance and scientific significance and, thus, has attracted continuous interest from synthetic chemists. Among the numerous synthetic approaches, Achmatowicz rearrangement (AchR) represents a general and unique strategy that uses biomass-derived furfuryl alcohols as the renewable starting material to obtain fully functionalized six-membered oxygen/nitrogen heterocycles, which provides golden opportunities for organic chemists to address various synthetic challenges.This Account summarizes our 10 years of work on exploiting AchR to address some challenges in organic synthesis ranging from green chemistry and organic methodology to the total synthesis of natural products. We enabled the sustainable and safe use of AchR in a small (academia) or large (industrial) scale by developing two generations of green approaches for AchR (oxone-halide and Fenton-halide), which largely eliminate the use of the most popular, but more toxic and expansive, NBS and m-CPBA. This triggered our intensive interest in developing new green chemistry for important organic reactions, in particular, halogenation/oxidation reactions involving reactive halogenating species with the aim of eliminating the use of commonly used toxic halogen agents such as elemental bromine, chlorine gas, and various N-haloamide reagents (NBS, NCS, and NIS). We successfully employed oxone-halide and Fenton-halide as green alternatives to several mechanistically related organic reactions including arene/alkene halogenation, oxidation or oxidative rearrangement of indoles, oxidation of alcohols/thioacetals, and oxidative halogenation of aldoximes for the in situ generation of nitrile oxide. These green reactions are expected to have a solid impact on the future of organic synthesis in academia and industries.We expanded the synthetic utility of AchR by exploring several new transformations of AchR products and developed a cascade reductive ring expansion, reductive deoxygenation/Heck-Matsuda arylation, palladium-catalyzed C-arylation, and regiodivergent [3 + 2] cycloaddition with 1,3-dicarbonyls. These methodologies offer a new avenue to fully functionalized six-membered heterocycles.The synthetic utility of AchR was demonstrated in our total synthesis of 28 natural products with a pyran/piperidine moiety. The AchR-based strategy endows the total synthesis with scalability, sustainability, and flexibility. The green and scalable approaches developed in our lab for AchR allow us to easily obtain decagrams of synthetically valuable pyrans and/or piperidines with low risk and low cost from biomass-derived furfuryl alcohol/aldehyde.
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12
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Yao JJ, Ding R, Chen X, Zhai H. Asymmetric Total Synthesis of (+)-Alstonlarsine A. J Am Chem Soc 2022; 144:14396-14402. [PMID: 35894835 DOI: 10.1021/jacs.2c06518] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The first asymmetric total synthesis of (+)-alstonlarsine A has been realized. The prominent features of the current synthesis include the following: (i) a Pd/self-adaptable ligand complex-catalyzed asymmetric allylic alkylation of 2-methyl-2-cyclopentenyl carbonate with 2-indolylsubstituted dimethyl malonate to establish the key stereocenter of C15, (ii) an intramolecular nitrile oxide-alkene [3 + 2] cycloaddition (INOC [3 + 2]) to construct the cyclohepta[b]indole backbone with the installment of the requisite stereochemistry of the all-carbon quaternary center of C20, and (iii) a late-stage interrupted Pictet-Spengler reaction (IPSR) to rapidly assemble the core structure of (+)-alstonlarsine A.
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Affiliation(s)
- Jun-Jun Yao
- The State Key Laboratory of Chemical Oncogenomics, Guangdong Provincial Key Laboratory of Nano-Micro Materials Research, School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen 518055, China
| | - Rui Ding
- The State Key Laboratory of Chemical Oncogenomics, Guangdong Provincial Key Laboratory of Nano-Micro Materials Research, School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen 518055, China
| | - Xiaoming Chen
- The State Key Laboratory of Chemical Oncogenomics, Guangdong Provincial Key Laboratory of Nano-Micro Materials Research, School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen 518055, China.,The State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
| | - Hongbin Zhai
- The State Key Laboratory of Chemical Oncogenomics, Guangdong Provincial Key Laboratory of Nano-Micro Materials Research, School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen 518055, China.,Shenzhen Bay Laboratory, Shenzhen 518055, China.,Institute of Marine Biomedicine, Shenzhen Polytechnic, Shenzhen 518055, China.,Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, China
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13
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Song L, Lai Y, Li H, Ding J, Yao H, Su Q, Huang B, Ouyang MA, Tong R. Environmentally Benign and User-Friendly In Situ Generation of Nitrile Imines from Hydrazones for 1,3-Dipolar Cycloaddition. J Org Chem 2022; 87:10550-10554. [PMID: 35866673 DOI: 10.1021/acs.joc.2c01391] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Nitrile imines are highly reactive and versatile dipoles and conventionally generated in situ from unstable hydrazonyl halides under basic conditions. Herein, we report the first green and user-friendly protocol for in situ generation of nitrile imines from Oxone-KBr oxidation of hydrazones and base-promoted dehydrobromination. The nitrile imines were demonstrated for 1,3-dipolar cycloaddition with various dipolarophiles, including alkene and alkyne groups. With its green nature, ease of operation, and air and moisture tolerance, we expect our method will find wide applications in organic synthesis.
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Affiliation(s)
- Liyan Song
- Key Laboratory of Biopesticide and Chemical Biology (Ministry of Education), College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China
| | - Yunrong Lai
- Key Laboratory of Biopesticide and Chemical Biology (Ministry of Education), College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China
| | - Hongzuo Li
- Key Laboratory of Biopesticide and Chemical Biology (Ministry of Education), College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China
| | - Jipeng Ding
- Key Laboratory of Biopesticide and Chemical Biology (Ministry of Education), College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China
| | - Hongliang Yao
- Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou 510275, Guangdong, China
| | - Qian Su
- Key Laboratory of Biopesticide and Chemical Biology (Ministry of Education), College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China
| | - Binbin Huang
- Key Laboratory of Biopesticide and Chemical Biology (Ministry of Education), College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China
| | - Ming-An Ouyang
- Key Laboratory of Biopesticide and Chemical Biology (Ministry of Education), College of Plant Protection, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian, China
| | - Rongbiao Tong
- Guangdong Key Laboratory of Animal Conservation and Resource Utilization, Guangdong Public Laboratory of Wild Animal Conservation and Utilization, Institute of Zoology, Guangdong Academy of Sciences, Guangzhou 510275, Guangdong, China.,Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay, Kowloon 999077, Hong Kong, China
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14
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Alvi S, Jayant V, Ali R. Applications of Oxone® in Organic Synthesis: An Emerging Green Reagent of Modern Era. ChemistrySelect 2022. [DOI: 10.1002/slct.202200704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Shakeel Alvi
- Department of Chemistry, Jamia Millia Islamia, Jamia Nagar, Okhla New Delhi 110025 India
| | - Vikrant Jayant
- Department of Chemistry, Jamia Millia Islamia, Jamia Nagar, Okhla New Delhi 110025 India
| | - Rashid Ali
- Department of Chemistry, Jamia Millia Islamia, Jamia Nagar, Okhla New Delhi 110025 India
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15
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Facile Synthesis of Tricyclic 1,2,4-Oxadiazolines-Fused Tetrahydro-Isoquinolines from Oxime Chlorides with 3,4-Dihydroisoquinoline Imines. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27103064. [PMID: 35630538 PMCID: PMC9145198 DOI: 10.3390/molecules27103064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Revised: 05/05/2022] [Accepted: 05/09/2022] [Indexed: 11/25/2022]
Abstract
A mild and efficient strategy for the synthesis of tricyclic 1,2,4-oxadiazolines-fused tetrahydro-isoquinolines derivatives via [3 + 2] cycloaddition reaction is reported. The reactions provided the functionalized tricyclic 1,2,4-oxadiazolines in high yields (up to 96%). This protocol is simple and easy to handle. Moreover, a gram-scale experiment further highlights the synthetic utility. The chemical structure of the product was determined by X-ray single-crystal structure analysis. A possible mechanism for this transformation is proposed to explain the reaction process.
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16
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Hossain MI, Khan MIH, Kim SJ, Le HV. Synthesis of 3,4,5-trisubstituted isoxazoles in water via a [3 + 2]-cycloaddition of nitrile oxides and 1,3-diketones, β-ketoesters, or β-ketoamides. Beilstein J Org Chem 2022; 18:446-458. [PMID: 35529890 PMCID: PMC9039522 DOI: 10.3762/bjoc.18.47] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2021] [Accepted: 04/08/2022] [Indexed: 11/23/2022] Open
Abstract
Herein we report a method for the synthesis of 3,4,5-trisubstituted isoxazoles in water under mild basic conditions at room temperature via a [3 + 2]-cycloaddition of nitrile oxides and 1,3-diketones, β-ketoesters, or β-ketoamides. We optimized the reaction conditions to control the selectivity of the production of isoxazoles and circumvent other competing reactions, such as O-imidoylation or hetero [3 + 2]-cycloaddition. The reaction happens fast in water and completes within 1–2 hours, which provides an environmentally friendly access to 3,4,5-trisubstituted isoxazoles, an important class of structures found in numerous bioactive natural products and pharmaceuticals. Additionally, we optimized the reaction conditions to produce trifluoromethyl-substituted isoxazoles, a prevalent scaffold in biomedical research and drug discovery programs. We also proposed a plausible mechanism for the selectivity of the [3 + 2]-cycloaddition reaction to produce 3,4,5-trisubstituted isoxazoles. Not to be overlooked are our optimized reaction conditions for the dimerization of hydroximoyl chlorides to form furoxans also known as 1,2,5-oxadiazole 2-oxides, a class of structures with important biological activities due to their unique electronic nature and coordination ability.
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Affiliation(s)
- Md Imran Hossain
- Department of BioMolecular Sciences and Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, Mississippi 38677, USA
| | - Md Imdadul H Khan
- Department of BioMolecular Sciences and Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, Mississippi 38677, USA
| | - Seong Jong Kim
- Natural Products Utilization Research Unit, United States Department of Agriculture, Agricultural Research Service, University of Mississippi, Mississippi 38677, USA
| | - Hoang V Le
- Department of BioMolecular Sciences and Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, Mississippi 38677, USA
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17
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Mechanochemical Dimerization of Aldoximes to Furoxans. Molecules 2022; 27:molecules27082604. [PMID: 35458802 PMCID: PMC9027020 DOI: 10.3390/molecules27082604] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2022] [Revised: 04/12/2022] [Accepted: 04/15/2022] [Indexed: 11/16/2022] Open
Abstract
Solvent-free mechanical milling is a new, environmentally friendly and cost-effective technology that is now widely used in the field of organic synthesis. The mechanochemical solvent-free synthesis of furoxans from aldoximes was achieved through dimerization of the in situ generated nitrile oxides in the presence of sodium chloride, Oxone and a base. A variety of furoxans was obtained with up to a 92% yield. The present protocol has the advantages of high reaction efficiency and mild reaction conditions.
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18
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Holman SDL, Wills AG, Fazakerley NJ, Poole DL, Coe DM, Berlouis LA, Reid M. Electrochemical Synthesis of Isoxazolines: Method and Mechanism. Chemistry 2022; 28:e202103728. [PMID: 35076117 PMCID: PMC9303936 DOI: 10.1002/chem.202103728] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Indexed: 11/11/2022]
Abstract
An electrochemical method for the green and practical synthesis of a broad range of substituted isoxazoline cores is presented. Both aryl and more challenging alkyl aldoximes are converted to the desired isoxazoline in an electrochemically enabled regio‐ and diastereoselective reaction with electron‐deficient alkenes. Additionally, in‐situ reaction monitoring methods compatible with electrochemistry equipment have been developed in order to probe the reaction pathway. Supporting analyses from kinetic (time‐course) modelling and density functional theory support a stepwise, radical‐mediated mechanism, and discounts hypothesised involvement of closed shell [3+2] cycloaddition pathways.
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Affiliation(s)
- Samuel D. L. Holman
- WestCHEM Department of Pure and Applied Chemistry University of Strathclyde Royal College Building 204 George Street Glasgow G1 1XW UK
- GlaxoSmithKline Medicines Research Centre Gunnels Wood Road Stevenage SG1 2NY UK
| | - Alfie G. Wills
- WestCHEM Department of Pure and Applied Chemistry University of Strathclyde Royal College Building 204 George Street Glasgow G1 1XW UK
- GlaxoSmithKline Medicines Research Centre Gunnels Wood Road Stevenage SG1 2NY UK
| | - Neal J. Fazakerley
- GlaxoSmithKline Medicines Research Centre Gunnels Wood Road Stevenage SG1 2NY UK
| | - Darren L. Poole
- GlaxoSmithKline Medicines Research Centre Gunnels Wood Road Stevenage SG1 2NY UK
| | - Diane M. Coe
- GlaxoSmithKline Medicines Research Centre Gunnels Wood Road Stevenage SG1 2NY UK
| | - Leonard A. Berlouis
- WestCHEM Department of Pure and Applied Chemistry University of Strathclyde Royal College Building 204 George Street Glasgow G1 1XW UK
| | - Marc Reid
- WestCHEM Department of Pure and Applied Chemistry University of Strathclyde Royal College Building 204 George Street Glasgow G1 1XW UK
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19
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Le Pors MS, Barri IA, Riafrecha LE, Echeverría GA, Piro OE, Colinas PA. Green Biphasic Synthesis, X‐Ray Diffraction Structure and Conformational Analysis of
O
‐Glycosylmethyl Isoxazoles: Potential Substrates of GLUT‐1 Glucose Transporter. ChemistrySelect 2022. [DOI: 10.1002/slct.202104379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Macarena S. Le Pors
- CEDECOR (UNLP-CICBA) CONICET Departamento de Química Facultad de Ciencias Exactas Universidad Nacional de La Plata, 47 y 115, 1900 La Plata Argentina
| | - Ivan A. Barri
- CEDECOR (UNLP-CICBA) CONICET Departamento de Química Facultad de Ciencias Exactas Universidad Nacional de La Plata, 47 y 115, 1900 La Plata Argentina
| | - Leonardo E. Riafrecha
- CEDECOR (UNLP-CICBA) CONICET Departamento de Química Facultad de Ciencias Exactas Universidad Nacional de La Plata, 47 y 115, 1900 La Plata Argentina
| | - Gustavo A. Echeverría
- Departamento de Física Facultad de Ciencias Exactas Universidad Nacional de La Plata and Institute IFLP (CONICET, CCT−La Plata) C. C. 67 1900 La Plata Argentina
| | - Oscar E. Piro
- Departamento de Física Facultad de Ciencias Exactas Universidad Nacional de La Plata and Institute IFLP (CONICET, CCT−La Plata) C. C. 67 1900 La Plata Argentina
| | - Pedro A. Colinas
- CEDECOR (UNLP-CICBA) CONICET Departamento de Química Facultad de Ciencias Exactas Universidad Nacional de La Plata, 47 y 115, 1900 La Plata Argentina
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20
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Wang KK, Li YL, Zhao YC, Zhang SS, Chen R, Sun A. Facile synthesis of O-acylhydroxamates via reaction of oxime chlorides with carboxylic acids. RSC Adv 2021; 11:40193-40196. [PMID: 35494140 PMCID: PMC9044751 DOI: 10.1039/d1ra06860a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Accepted: 12/03/2021] [Indexed: 12/16/2022] Open
Abstract
A simple and efficient method for the synthesis of O-acylhydroxamate derivatives from oxime chlorides and carboxylic acids was developed. The reaction affords clean and facile access to diverse O-acylhydroxamates in high yields (up to 85%). The chemical structure of a typical product was confirmed using single-crystal X-ray structure analysis. A simple and practical method for synthesizing a broad range of functionalized O-acylhydroxamates in high yields from oxime chlorides and carboxylic acids has been achieved.![]()
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Affiliation(s)
- Kai-Kai Wang
- School of Pharmacy, Xinxiang University Xinxiang 453000 P. R. China +86-373-3682674.,Key Laboratory of Nano-carbon Modified Film Technology Engineering of Henan Province Xinxiang 453000 P. R. China
| | - Yan-Li Li
- Medical College, Xinxiang University Xinxiang 453000 P. R. China
| | - Ying-Chao Zhao
- School of Pharmacy, Xinxiang University Xinxiang 453000 P. R. China +86-373-3682674
| | - Shan-Shan Zhang
- School of Pharmacy, Xinxiang University Xinxiang 453000 P. R. China +86-373-3682674
| | - Rongxiang Chen
- School of Pharmacy, Xinxiang University Xinxiang 453000 P. R. China +86-373-3682674
| | - Aili Sun
- School of Pharmacy, Xinxiang University Xinxiang 453000 P. R. China +86-373-3682674.,Key Laboratory of Nano-carbon Modified Film Technology Engineering of Henan Province Xinxiang 453000 P. R. China
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21
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Chalyk BA, Khutorianskyi AV, Vashchenko BV, Danyleiko K, Grynyova A, Osipova AO, Kozytskiy A, Syniuchenko D, Tsymbaliuk A, Gavrilenko KS, Biitseva AV, Volochnyuk DM, Komarov IV, Grygorenko OO. Reductive Recyclization of sp 3-Enriched Functionalized Isoxazolines into α-Hydroxy Lactams. J Org Chem 2021; 87:1001-1018. [PMID: 34843235 DOI: 10.1021/acs.joc.1c02301] [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
An efficient synthesis (up to a 200 g scale) of 3-hydroxypyrrolidin-2-ones bearing alkyl substituents or functional groups at the C-5 position is described. The reaction sequence started from 1,3-dipolar cycloaddition of in situ generated nitrile oxides with (meth-)acrylates into 3-substituted isoxazoline-5-carboxylates. The catalytic hydrogenolysis of the isoxazoline N-O bond was optimal upon using H2 (1 atm) at rt, with the following order of the catalyst activity: Pd-C > Pd(OH)2-C > Pt-C. The reactions with Pt-C were more selective for the synthesis of pyrrolidones, while Pd-C provided the fastest conversion rates. The stirring efficiency had a positive impact on conversion rather than elevated temperatures (up to 40 °C) or pressure (up to 50 atm). The diastereoselectivity was governed mainly by steric factors, with a dr of 1:1 to 3:1 (cis- and trans-isomers could be separated). Higher homologues (isoxazolinylacetates and -propanoates) were suitable for the synthesis of 6- or 7-substituted 4-hydroxypiperidones and 5-hydroxyazepanones, respectively. The proposed methods are tolerant to functional groups, including CF3 (but not CHF2 or CH2Cl), ester, and most N-Boc-protected amines. The utility of hydroxyl groups in lactams was shown by functional group transformations. Hydrogenolysis of C(5)-functionalized isoxazolines, bearing trimethylsilyl, phosphonate, or sulfone groups, was also studied to demonstrate limitations.
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Affiliation(s)
- Bohdan A Chalyk
- Institute of Organic Chemistry, National Academy of Sciences of Ukraine, Murmanska Street 5, Kyiv 02094, Ukraine
| | - Andrii V Khutorianskyi
- Enamine Ltd., Chervonotkatska Street 78, Kyiv 02094, Ukraine.,Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyiv 01601, Ukraine
| | - Bohdan V Vashchenko
- Enamine Ltd., Chervonotkatska Street 78, Kyiv 02094, Ukraine.,Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyiv 01601, Ukraine
| | - Kyrylo Danyleiko
- Enamine Ltd., Chervonotkatska Street 78, Kyiv 02094, Ukraine.,Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyiv 01601, Ukraine
| | - Anastasiia Grynyova
- Institute of Organic Chemistry, National Academy of Sciences of Ukraine, Murmanska Street 5, Kyiv 02094, Ukraine.,Enamine Ltd., Chervonotkatska Street 78, Kyiv 02094, Ukraine
| | - Anastasiia O Osipova
- Enamine Ltd., Chervonotkatska Street 78, Kyiv 02094, Ukraine.,Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyiv 01601, Ukraine
| | - Andriy Kozytskiy
- Enamine Ltd., Chervonotkatska Street 78, Kyiv 02094, Ukraine.,L. V. Pisarzhevskii Institute of Physical Chemistry of National Academy of Sciences of Ukraine, Nauky Avenue, 31, Kyiv 03028, Ukraine
| | - Darya Syniuchenko
- Enamine Ltd., Chervonotkatska Street 78, Kyiv 02094, Ukraine.,Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyiv 01601, Ukraine
| | - Anton Tsymbaliuk
- Enamine Ltd., Chervonotkatska Street 78, Kyiv 02094, Ukraine.,Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyiv 01601, Ukraine
| | - Konstantin S Gavrilenko
- Enamine Ltd., Chervonotkatska Street 78, Kyiv 02094, Ukraine.,Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyiv 01601, Ukraine
| | - Angelina V Biitseva
- Enamine Ltd., Chervonotkatska Street 78, Kyiv 02094, Ukraine.,Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyiv 01601, Ukraine
| | - Dmitriy M Volochnyuk
- Institute of Organic Chemistry, National Academy of Sciences of Ukraine, Murmanska Street 5, Kyiv 02094, Ukraine.,Enamine Ltd., Chervonotkatska Street 78, Kyiv 02094, Ukraine.,Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyiv 01601, Ukraine
| | - Igor V Komarov
- Enamine Ltd., Chervonotkatska Street 78, Kyiv 02094, Ukraine.,Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyiv 01601, Ukraine
| | - Oleksandr O Grygorenko
- Enamine Ltd., Chervonotkatska Street 78, Kyiv 02094, Ukraine.,Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyiv 01601, Ukraine
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22
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Convenient Synthesis of Pyrazolo[4',3':5,6]pyrano[4,3- c][1,2]oxazoles via Intramolecular Nitrile Oxide Cycloaddition. Molecules 2021; 26:molecules26185604. [PMID: 34577075 PMCID: PMC8469150 DOI: 10.3390/molecules26185604] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 09/13/2021] [Accepted: 09/14/2021] [Indexed: 01/07/2023] Open
Abstract
A simple and efficient synthetic route to the novel 3a,4-dihydro-3H,7H- and 4H,7H-pyrazolo[4′,3′:5,6]pyrano[4,3-c][1,2]oxazole ring systems from 3-(prop-2-en-1-yloxy)- or 3-(prop-2-yn-1-yloxy)-1H-pyrazole-4-carbaldehyde oximes has been developed by employing the intramolecular nitrile oxide cycloaddition (INOC) reaction as the key step. The configuration of intermediate aldoximes was unambiguously determined using NOESY experimental data and comparison of the magnitudes of 1JCH coupling constants of the iminyl moiety, which were greater by approximately 13 Hz for the predominant syn isomer. The structures of the obtained heterocyclic products were confirmed by detailed 1H, 13C and 15N NMR spectroscopic experiments and HRMS measurements.
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23
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Ma F, He C, Wang E, Tong R. Collective Asymmetric Total Syntheses of Marine Decahydroquinoline Alkaloid Lepadins A-E, H, and ent-I. Org Lett 2021; 23:6583-6588. [PMID: 34374548 DOI: 10.1021/acs.orglett.1c02435] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Lepadins are cis-fused decahydroquinoline (DHQ) marine alkaloids that have shown diverse biological activities and have attracted extensive synthetic interest. A new collective synthetic strategy is reported that features a green chemistry approach for constructing the common cis-fused DHQ core, which is achieved through green oxone-halide oxidation for both the aza-Achmatowicz rearrangement and the intramolecular [3 + 2] cycloaddition of nitrile oxide-alkene. Collective total syntheses of lepadins A-E and H are accomplished from the common DHQ core within 10 steps.
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Affiliation(s)
- Foqing Ma
- Department of Chemistry and Hong Kong Branch of the Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), The Hong Kong University of Science and Technology, Hong Kong, China
| | - Chenxi He
- Department of Chemistry and Hong Kong Branch of the Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), The Hong Kong University of Science and Technology, Hong Kong, China
| | - Eryu Wang
- Department of Chemistry and Hong Kong Branch of the Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), The Hong Kong University of Science and Technology, Hong Kong, China
| | - Rongbiao Tong
- Department of Chemistry and Hong Kong Branch of the Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), The Hong Kong University of Science and Technology, Hong Kong, China
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24
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Ma L, Jin F, Cheng X, Tao S, Jiang G, Li X, Yang J, Bao X, Wan X. [2 + 2 + 1] Cycloaddition of N-tosylhydrazones, tert-butyl nitrite and alkenes: a general and practical access to isoxazolines. Chem Sci 2021; 12:9823-9830. [PMID: 34349956 PMCID: PMC8293996 DOI: 10.1039/d1sc02352g] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Accepted: 06/19/2021] [Indexed: 12/11/2022] Open
Abstract
N-Tosylhydrazones have proven to be versatile synthons over the past several decades. However, to our knowledge, the construction of isoxazolines based on N-tosylhydrazones has not been examined. Herein, we report the first demonstrations of [2 + 2 + 1] cycloaddition reactions that allow the facile synthesis of isoxazolines, employing N-tosylhydrazones, tert-butyl nitrite (TBN) and alkenes as reactants. This process represents a new type of cycloaddition reaction with a distinct mechanism that does not involve the participation of nitrile oxides. This approach is both general and practical and exhibits a wide substrate scope, nearly universal functional group compatibility, tolerance of moisture and air, the potential for functionalization of complex bioactive molecules and is readily scaled up. Both control experiments and theoretical calculations indicate that this transformation proceeds via the in situ generation of a nitronate from the coupling of N-tosylhydrazone and TBN, followed by cycloaddition with an alkene and subsequent elimination of a tert-butyloxy group to give the desired isoxazoline.
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Affiliation(s)
- Liang Ma
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University Suzhou 215123 China
| | - Feng Jin
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University Suzhou 215123 China
| | - Xionglve Cheng
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University Suzhou 215123 China
| | - Suyan Tao
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University Suzhou 215123 China
| | - Gangzhong Jiang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University Suzhou 215123 China
| | - Xingxing Li
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University Suzhou 215123 China
| | - Jinwei Yang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University Suzhou 215123 China
| | - Xiaoguang Bao
- 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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25
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Ushakov PY, Sukhorukov AY, Ioffe SL, Tabolin AA. Sequential Formal [4+1]‐Cycloaddition, C−H Functionalization and Suzuki–Miyaura Cross‐Coupling for the Synthesis of Trisubstituted Isoxazolines. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100313] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Pavel Yu. Ushakov
- Laboratory of organic and metal-organic nitrogen-oxygen systems N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences Leninsky prospect, 47 119991 Moscow Russia
- Department of Chemistry M. V. Lomonosov Moscow State University Leninskie gory, 1, str. 3 119991 Moscow Russia
| | - Alexey Yu. Sukhorukov
- Laboratory of organic and metal-organic nitrogen-oxygen systems N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences Leninsky prospect, 47 119991 Moscow Russia
- Plekhanov Russian University of Economics Stremyanny per. 36 117997 Moscow Russia
| | - Sema L. Ioffe
- Laboratory of organic and metal-organic nitrogen-oxygen systems N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences Leninsky prospect, 47 119991 Moscow Russia
| | - Andrey A. Tabolin
- Laboratory of organic and metal-organic nitrogen-oxygen systems N. D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences Leninsky prospect, 47 119991 Moscow Russia
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26
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Lugiņina J, Linden M, Bazulis M, Kumpiņš V, Mishnev A, Popov SA, Golubeva TS, Waldvogel SR, Shults EE, Turks M. Electrosynthesis of Stable Betulin‐Derived Nitrile Oxides and their Application in Synthesis of Cytostatic Lupane‐Type Triterpenoid‐Isoxazole Conjugates. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100293] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Jevgeņija Lugiņina
- Faculty of Materials Science and Applied Chemistry RigaTechnical University P. Valdena Str.3 Riga 1007 Latvia
| | - Martin Linden
- Department of Chemistry Johannes Gutenberg University Mainz Duesbergweg 10–14 Mainz 55128 Germany
| | - Māris Bazulis
- Faculty of Materials Science and Applied Chemistry RigaTechnical University P. Valdena Str.3 Riga 1007 Latvia
| | - Viktors Kumpiņš
- Faculty of Materials Science and Applied Chemistry RigaTechnical University P. Valdena Str.3 Riga 1007 Latvia
| | - Anatoly Mishnev
- Latvian Institute of Organic Synthesis Aizkraukles Str. 21 Riga 1006 Latvia
| | - Sergey A. Popov
- Novosibirsk Institute of Organic Chemistry Academician Lavrentjev Ave. 9 Novosibirsk 630090 Russia
| | - Tatiana S. Golubeva
- The Federal Research Center Institute of Cytology and Genetics Acad. Lavrentyev Ave., 10 Novosibirsk 630090 Russia
| | - Siegfried R. Waldvogel
- Department of Chemistry Johannes Gutenberg University Mainz Duesbergweg 10–14 Mainz 55128 Germany
| | - Elvira E. Shults
- Novosibirsk Institute of Organic Chemistry Academician Lavrentjev Ave. 9 Novosibirsk 630090 Russia
| | - Māris Turks
- Faculty of Materials Science and Applied Chemistry RigaTechnical University P. Valdena Str.3 Riga 1007 Latvia
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27
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Ghosh AK, Hsu CS. Enantioselective Total Synthesis of (+)-EBC-23, a Potent Anticancer Agent from the Australian Rainforest. J Org Chem 2021; 86:6351-6360. [PMID: 33872504 DOI: 10.1021/acs.joc.1c00172] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We describe here an enantioselective synthesis of (+)-EBC-23, a potent anticancer agent from the Australian rainforest. Our convergent synthesis features a [3+2] dipolar cycloaddition of an olefin-bearing 1,3-syn diol unit and an oxime segment containing 1,2-syn diol functionality as the key step. The segments were synthesized in a highly enantioselective manner using Noyori asymmetric hydrogenation of a β-keto ester and Sharpless asymmetric dihydroxylation of an α,β-unsaturated ester. Cycloaddition provided isoxazoline derivative which upon hydrogenolysis furnished the β-hydroxy ketone expediently. A one-pot, acid-catalyzed reaction removed the isopropylidene group, promoted spirocyclization, constructed the complex spiroketal lactone core, and furnished EBC-23 and its C11 epimer. The C11 epimer was also converted to EBC-23 by chemoselective oxidation and reduction sequence. The present synthesis provides convenient access to this family of natural products in an efficient manner.
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28
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Affiliation(s)
- Dominik Gaugele
- Eberhard Karls Universität Tübingen Institut für Organische Chemie Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Martin E. Maier
- Eberhard Karls Universität Tübingen Institut für Organische Chemie Auf der Morgenstelle 18 72076 Tübingen Germany
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29
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Ha H, Kim B, Kwon K, Kim SH, Cho C. Synthesis of TKX‐50 via 2‐Methoxyisopropyl‐Protected Diazidoglyoxime as an Insensitive Intermediate. PROPELLANTS EXPLOSIVES PYROTECHNICS 2021. [DOI: 10.1002/prep.202000287] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Heun‐Jong Ha
- Department of Chemistry and Green-Nano Materials Research Center Kyungpook National University Daegu 41566 Republic of Korea
| | - Bora Kim
- Department of Chemistry and Green-Nano Materials Research Center Kyungpook National University Daegu 41566 Republic of Korea
| | - Kuktae Kwon
- The 4th R&D Institute – 2nd Directorate Agency for Defense Development Daejeon 34186 Republic of Korea
| | - Seung Hee Kim
- The 4th R&D Institute – 2nd Directorate Agency for Defense Development Daejeon 34186 Republic of Korea
| | - Chang‐Woo Cho
- Department of Chemistry and Green-Nano Materials Research Center Kyungpook National University Daegu 41566 Republic of Korea
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30
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Feng Q, Huang H, Sun J. Ru-Catalyzed [3 + 2] Cycloaddition of Nitrile Oxides and Electron-Rich Alkynes with Reversed Regioselectivity. Org Lett 2021; 23:2431-2436. [PMID: 33750136 DOI: 10.1021/acs.orglett.1c00273] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Polarity reversal ("umpolung") of a functional group can override its inherent reactivity and lead to distinct bond-forming modes. Herein we describe a rarely studied cycloaddition between nitrile oxides and electron-rich alkynes with reversed regioselectivity, leading to the useful 4-heterosubstituted isoxazoles. The use of a ruthenium catalyst completely overrides the inherent polarity of nitrile oxides. This reversed regioselectivity was also observed for their reactions with a range of electron-deficient alkynes.
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Affiliation(s)
- Qiang Feng
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China.,Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Hai Huang
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China
| | - Jianwei Sun
- Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology, School of Petrochemical Engineering, Changzhou University, Changzhou 213164, China.,Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
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31
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Hellwig PS, Guedes JS, Barcellos AM, Jacob RG, Silveira CC, Lenardão EJ, Perin G. Synthesis of benzo[ b]chalcogenophenes fused to selenophenes via intramolecular electrophilic cyclization of 1,3-diynes. Org Biomol Chem 2021; 19:596-604. [PMID: 33355583 DOI: 10.1039/d0ob02362k] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
We describe herein an alternative and transition-metal-free procedure for the access of benzo[b]chalcogenophenes fused to selenophenes via intramolecular cyclization of 1,3-diynes. This efficient protocol involves a double cyclization of 1,3-diynyl chalcogen derivatives promoted by the electrophilic species of organoselenium generated in situ by the oxidative cleavage of the Se-Se bond of dibutyl diselenide using Oxone® in acetonitrile as solvent in an open-flask at 80 °C. In this study, 15 selenophenes with broad substrate scope were prepared in moderate to excellent yields (55-98%) with short reaction times (0.5-3.0 h).
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Affiliation(s)
- Paola S Hellwig
- LASOL-CCQFA, Universidade Federal de Pelotas - UFPel, P.O. Box 354, 96010-900, Pelotas, RS, Brazil.
| | - Jonatan S Guedes
- LASOL-CCQFA, Universidade Federal de Pelotas - UFPel, P.O. Box 354, 96010-900, Pelotas, RS, Brazil.
| | - Angelita M Barcellos
- LASOL-CCQFA, Universidade Federal de Pelotas - UFPel, P.O. Box 354, 96010-900, Pelotas, RS, Brazil.
| | - Raquel G Jacob
- LASOL-CCQFA, Universidade Federal de Pelotas - UFPel, P.O. Box 354, 96010-900, Pelotas, RS, Brazil.
| | - Claudio C Silveira
- Departamento de Química, Universidade Federal de Santa Maria - UFSM, CEP: 97105-900, Santa Maria - RS, Brazil
| | - Eder J Lenardão
- LASOL-CCQFA, Universidade Federal de Pelotas - UFPel, P.O. Box 354, 96010-900, Pelotas, RS, Brazil.
| | - Gelson Perin
- LASOL-CCQFA, Universidade Federal de Pelotas - UFPel, P.O. Box 354, 96010-900, Pelotas, RS, Brazil.
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32
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Wang S, Yan C, Zhao W, Liu X, Yuan CS, Zhang HL, Shao X. A tellura-Baeyer-Villiger oxidation: one-step transformation of tellurophene into chiral tellurinate lactone. Chem Sci 2021; 12:5811-5817. [PMID: 34168805 PMCID: PMC8179672 DOI: 10.1039/d1sc00397f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Accepted: 03/08/2021] [Indexed: 01/22/2023] Open
Abstract
Baeyer-Villiger (BV) oxidation is a fundamental organic reaction, whereas the hetero-BV oxidation is uncharted. Herein, a tellura-BV oxidation is discovered. By oxidizing a tellurophene-embedded and electron-rich polycycle (1) with mCPBA or Oxone, an oxygen atom is inserted into the Te-C bond of the tellurophene to form tellurinate lactone mono-2. This reaction proceeds as follows: (i) 1 is oxidized to the tellurophene Te-oxide form (IM-1); (ii) IM-1 undergoes tellura-BV oxidation to give mono-2. Moreover, the hybrid trichalcogenasumanenes 7 and 8 are, respectively, converted to tellurinate lactones mono-9 and mono-10 under the same conditions, indicating that tellura-BV oxidation shows high chemoselectivity. Due to the strong secondary bonding interactions between the Te[double bond, length as m-dash]O groups on tellurinate lactones, mono-2, mono-9, and mono-10 are dimerized to form U-shaped polycycles 2, 9, and 10, respectively. Notably, mono-2, mono-9, mono-10, and their dimers show chirality. This work enables one-step transformation of tellurophene into tellurinate lactone and construction of intricate polycycles.
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Affiliation(s)
- Shitao Wang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University Tianshui Southern Road 222 Lanzhou 730000 China
| | - Chaoxian Yan
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University Tianshui Southern Road 222 Lanzhou 730000 China
| | - Wenlong Zhao
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University Tianshui Southern Road 222 Lanzhou 730000 China
| | - Xiaolan Liu
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University Tianshui Southern Road 222 Lanzhou 730000 China
| | - Cheng-Shan Yuan
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University Tianshui Southern Road 222 Lanzhou 730000 China
| | - Hao-Li Zhang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University Tianshui Southern Road 222 Lanzhou 730000 China
| | - Xiangfeng Shao
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University Tianshui Southern Road 222 Lanzhou 730000 China
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33
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Plumet J. 1,3-Dipolar Cycloaddition Reactions of Nitrile Oxides under "Non-Conventional" Conditions: Green Solvents, Irradiation, and Continuous Flow. Chempluschem 2021; 85:2252-2271. [PMID: 33044044 DOI: 10.1002/cplu.202000448] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Revised: 08/11/2020] [Indexed: 01/15/2023]
Abstract
The 1,3-dipolar cycloaddition reactions (DCs) of nitrile oxides (NOs) to alkenes and alkynes are useful methods for the synthesis of 2-isoxazolines and isoxazoles respectively, which are important classes of heterocyclic compounds in organic and medicinal chemistry. Most of these reactions are carried out in organic solvents and under thermal activation. Nevertheless the use of supercritical carbon dioxide (scCO2 ) and ionic liquids (Ils) as alternative solvents and the application of microwave (MW) and ultrasound (US) as alternative activation procedures have evident advantages from the "Green Chemistry" point of view. The critical discussion on the applications of these "unconventional" activation methods and reaction conditions in the 1,3-DCs of NOs is the objective of the present Review.
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Affiliation(s)
- Joaquín Plumet
- Department of Organic Chemistry. Faculty of Chemistry, Complutense University of Madrid, Ciudad Universitaria, 28040, Madrid, Spain
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34
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Jamieson C, Livingstone K, Little G. Recent Advances in the Generation of Nitrilium Betaine 1,3-Dipoles. SYNTHESIS-STUTTGART 2021. [DOI: 10.1055/a-1389-1281] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
AbstractNitrilium betaine 1,3-dipoles are ubiquitous reagents in organic chemistry, with applications ranging from natural product synthesis to materials science. Given the high reactivity of these zwitterionic motifs, they are invariably generated in situ from a suitable precursor, prior to use. This short review summarises the recent progress in the development of modern approaches towards the formation of these 1,3-dipoles, and their applications within a diverse range of fields.1 Introduction2 Nitrile Ylides2.1 2H-Azirine Rearrangement2.2 Addition of Nitriles to Carbenes3 Nitrile Imines3.1 2,5-Tetrazole Thermolysis3.2 2,5-Tetrazole Photolysis3.3 Diaryl Sydnone Photolysis4 Nitrile Oxides4.1 Hypervalent Iodine4.2 The Nitroso Radical4.3 Green Chemistry Approaches4.4 Other Approaches5 Conclusions
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35
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Zhang XW, He XL, Yan N, Zheng HX, Hu XG. Oxidize Amines to Nitrile Oxides: One Type of Amine Oxidation and Its Application to Directly Construct Isoxazoles and Isoxazolines. J Org Chem 2020; 85:15726-15735. [PMID: 33174420 DOI: 10.1021/acs.joc.0c02281] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A facile oxidative heterocyclization of commercially available amines and tert-butyl nitrite with alkynes or alkenes leading to isoxazoles or isoxazolines is described. The unprecedented strategy of the oxidation of an amine directly to a nitrile oxide was used in this cyclization process. This reaction is highly efficient, regiospecific, operationally simple, mild, and tolerant of a variety of functional groups. Control experiments support a nitrile oxide intermediate mechanism for this novel class of oxidative cyclization reactions. Moreover, synthetic applications toward bioactive molecular skeletons and the late-stage modification of drugs were realized.
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Affiliation(s)
- Xiao-Wei Zhang
- National Engineering Research Center for Carbohydrate Synthesis, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, China.,School of Chemistry and Chemical Engineering, Liaocheng University, No. 1, Hunan Street, Liaocheng, Shandong 252059, China
| | - Xiao-Lin He
- National Engineering Research Center for Carbohydrate Synthesis, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, China.,School of Chemistry and Chemical Engineering, Liaocheng University, No. 1, Hunan Street, Liaocheng, Shandong 252059, China
| | - Nan Yan
- National Engineering Research Center for Carbohydrate Synthesis, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, China.,School of Chemistry and Chemical Engineering, Liaocheng University, No. 1, Hunan Street, Liaocheng, Shandong 252059, China
| | - Hong-Xing Zheng
- National Engineering Research Center for Carbohydrate Synthesis, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, China.,School of Chemistry and Chemical Engineering, Liaocheng University, No. 1, Hunan Street, Liaocheng, Shandong 252059, China
| | - Xiang-Guo Hu
- National Engineering Research Center for Carbohydrate Synthesis, Jiangxi Normal University, 99 Ziyang Road, Nanchang, Jiangxi 330022, China.,School of Chemistry and Chemical Engineering, Liaocheng University, No. 1, Hunan Street, Liaocheng, Shandong 252059, China
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36
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Thari FZ, Tachallait H, El Alaoui NE, Talha A, Arshad S, Álvarez E, Karrouchi K, Bougrin K. Ultrasound-assisted one-pot green synthesis of new N- substituted-5-arylidene-thiazolidine-2,4-dione-isoxazoline derivatives using NaCl/Oxone/Na 3PO 4 in aqueous media. ULTRASONICS SONOCHEMISTRY 2020; 68:105222. [PMID: 32585575 DOI: 10.1016/j.ultsonch.2020.105222] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2020] [Revised: 05/13/2020] [Accepted: 06/06/2020] [Indexed: 06/11/2023]
Abstract
A rapid and green method for the synthesis of novel N-thiazolidine-2,4-dione isoxazoline derivatives 5 from N-allyl-5-arylidenethiazolidine-2,4-diones 3 as dipolarophiles with arylnitrile oxides via 1,3-dipolar cycloaddition reaction. The corresponding N-allyl substituted dipolarophiles were prepared by one-pot method from thiazolidine-2,4-dione with aldehydes using Knoevenagel condensation followed by N-allylation of thiazolidine-2,4-dione in NaOH aqueous solution under sonication. In addition, the isoxazoline derivatives 5 were synthesized by regioselective and chemoselective 1,3-dipolar cycloaddition using inexpensive and mild NaCl/Oxone/Na3PO4 as a Cl source, oxidant and/or catalyst under ultrasonic irradiation in EtOH/H2O (v/v, 2:1) as green solvent. All synthesized products are furnished in good yields in the short reaction time, and then their structures were confirmed by NMR, mass spectrometry and X-ray crystallography analysis.
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Affiliation(s)
- Fatima Zahra Thari
- Equipe de Chimie des Plantes et de Synthèse Organique et Bioorganique, URAC23, Faculty of Science, B.P. 1014, Geophysics, Natural Patrimony and Green Chemistry (GEOPAC) Research Center, Mohammed V University of Rabat, Morocco
| | - Hamza Tachallait
- Equipe de Chimie des Plantes et de Synthèse Organique et Bioorganique, URAC23, Faculty of Science, B.P. 1014, Geophysics, Natural Patrimony and Green Chemistry (GEOPAC) Research Center, Mohammed V University of Rabat, Morocco
| | - Nour-Eddine El Alaoui
- Equipe de Chimie des Plantes et de Synthèse Organique et Bioorganique, URAC23, Faculty of Science, B.P. 1014, Geophysics, Natural Patrimony and Green Chemistry (GEOPAC) Research Center, Mohammed V University of Rabat, Morocco
| | - Aicha Talha
- Equipe de Chimie des Plantes et de Synthèse Organique et Bioorganique, URAC23, Faculty of Science, B.P. 1014, Geophysics, Natural Patrimony and Green Chemistry (GEOPAC) Research Center, Mohammed V University of Rabat, Morocco
| | - Suhana Arshad
- X-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia
| | - Eleuterio Álvarez
- Instituto de Investigaciones Químicas, CSIC-Universidad de Sevilla, Avda. Américo Vespucio 49, 41092 Sevilla, Spain
| | - Khalid Karrouchi
- Laboratory of Analytical Chemistry and Bromatology, Faculty of Medicine and Pharmacy, Mohammed V University, Rabat, Morocco.
| | - Khalid Bougrin
- Equipe de Chimie des Plantes et de Synthèse Organique et Bioorganique, URAC23, Faculty of Science, B.P. 1014, Geophysics, Natural Patrimony and Green Chemistry (GEOPAC) Research Center, Mohammed V University of Rabat, Morocco; Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid, Benguerir, Morocco.
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37
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Reaction of Aldoximes with Sodium Chloride and Oxone under Ball-Milling Conditions. Molecules 2020; 25:molecules25163719. [PMID: 32824070 PMCID: PMC7463692 DOI: 10.3390/molecules25163719] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 08/09/2020] [Accepted: 08/11/2020] [Indexed: 12/20/2022] Open
Abstract
The solvent-free mechanochemical reaction has aroused increasing interest among scientists. Mechanical ball-milling can implement reactions under mild conditions, shorten the reaction time, and improve the reaction efficiency. Particularly, the most attractive characteristic of mechanochemistry is that it can alter the reaction pathway. However, few such examples have been reported so far. In this paper, we report the reaction of aldoximes with NaCl and Oxone under ball-milling conditions to afford N-acyloxyimidoyl chlorides, which are different from those of the liquid-phase counterpart.
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38
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Liao J, Ouyang L, Jin Q, Zhang J, Luo R. Recent advances in the oxime-participating synthesis of isoxazolines. Org Biomol Chem 2020; 18:4709-4716. [PMID: 32525196 DOI: 10.1039/d0ob00963f] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Isoxazoline compounds are used as important intermediates for the synthesis of organic molecules, which are widely used in the chemical and life science industries. Oxime-participating cyclization has emerged as an efficient strategy for the construction of isoxazolines. This review is devoted to highlighting the main achievements (since 2010) in the development of methodologies for the synthesis of isoxazolines. According to the reaction mechanism, the oxime-participating synthesis of isoxazolines can be mainly classified into four reaction types: iminoxyl radical-initiated intramolecular cyclization, intermolecular radical addition-initiated cyclization, intramolecular nucleophilic cyclization, and [3 + 2] cycloaddition. Meanwhile, miscellaneous examples are also illustrated, such as [2 + 2 + 1] cycloaddition. Representative reactions will be discussed for each of the highlighted synthetic strategies. In addition, the enantioselective synthesis of isoxazolines is also illustrated in this review.
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Affiliation(s)
- Jianhua Liao
- School of Pharmaceutical Sciences, Gannan Medical University, Ganzhou, 341000, Jiangxi Province, P. R. China. and School of Pharmacy, University of Wisconsin-Madison, Madison, WI 53705, USA
| | - Lu Ouyang
- School of Pharmaceutical Sciences, Gannan Medical University, Ganzhou, 341000, Jiangxi Province, P. R. China.
| | - Qi Jin
- School of Pharmaceutical Sciences, Gannan Medical University, Ganzhou, 341000, Jiangxi Province, P. R. China.
| | - Jian Zhang
- School of Pharmaceutical Sciences, Gannan Medical University, Ganzhou, 341000, Jiangxi Province, P. R. China.
| | - Renshi Luo
- School of Pharmaceutical Sciences, Gannan Medical University, Ganzhou, 341000, Jiangxi Province, P. R. China.
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39
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Lauro F, Francisco DC, Maria L, Rolando G, Marcela R, Virginia M, Alejandra GE, Yaritza B, Yazmin O. Design and synthesis of a bismethylsulfanyl‐steroid‐azetyl butanol derivative from 2‐nitroestradiol. J Heterocycl Chem 2020. [DOI: 10.1002/jhet.3899] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Figueroa‐Valverde Lauro
- Laboratory of Pharmacochemistry, Faculty of Biological Chemical SciencesUniversity Autonomous of Campeche Campeche Mexico
| | - Diaz C. Francisco
- Escuela de Ciencias BiologicasInstituto Politecnico Nacional Mexico City Mexico
| | - Lopez‐Ramos Maria
- Laboratory of Pharmacochemistry, Faculty of Biological Chemical SciencesUniversity Autonomous of Campeche Campeche Mexico
| | - Garcia‐Martinez Rolando
- Laboratory of Pharmacochemistry, Faculty of Biological Chemical SciencesUniversity Autonomous of Campeche Campeche Mexico
| | | | | | | | - Borges‐Ballote Yaritza
- Laboratory of Pharmacochemistry, Faculty of Biological Chemical SciencesUniversity Autonomous of Campeche Campeche Mexico
| | - Ortiz‐Ake Yazmin
- Laboratory of Pharmacochemistry, Faculty of Biological Chemical SciencesUniversity Autonomous of Campeche Campeche Mexico
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40
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Pan Z, Mao K, Zhu G, Wang C, Zhang J, Rong L. Copper-Catalyzed Annulation Reaction of Alkenes and N-Alkyl(aryl)-1-(methylthio)-2-nitroethenamine: an Approach for the Synthesis of Isoxazole Derivatives. J Org Chem 2020; 85:3364-3373. [PMID: 32037815 DOI: 10.1021/acs.joc.9b03157] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
A copper-catalyzed annulation reaction to access a variety of isoxazoles from alkenes and oxazete in situ generated from N-alkyl(aryl)-1-(methylthio)-2-nitroethenamine was reported. A plausible mechanism underlying the formation of the product was proposed, which represented a new approach for the construction of isoxazolines. This reaction was capable of tolerating alkenes bearing various substituents, which showed a relatively broad substrate scope with good functional group compatibility.
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Affiliation(s)
- Zhengbing Pan
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, 221116 Jiangsu, PR China
| | - Kaimin Mao
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, 221116 Jiangsu, PR China
| | - Guangzhou Zhu
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, 221116 Jiangsu, PR China
| | - Chang Wang
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, 221116 Jiangsu, PR China
| | - Jinpeng Zhang
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, 221116 Jiangsu, PR China.,Key Lab of Environment and Health, School of Public Health, Xuzhou Medical University, Xuzhou, 221006 Jiangsu, PR China
| | - Liangce Rong
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, 221116 Jiangsu, PR China
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41
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Yamamoto T, Togo H. Transformation of arenes into 3-arylpyrazoles and 3-arylisoxazolines with β-bromopropionyl chloride, hydrazine, and hydroxylamine. Tetrahedron 2020. [DOI: 10.1016/j.tet.2019.130920] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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42
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Guo X, Xu G, Zhou L, Yan H, Hao XQ, Wang Q. Synthesis and application of α-carbonyl nitrile oxides. Org Chem Front 2020. [DOI: 10.1039/d0qo00780c] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A strategy has been developed to synthesize α-carbonylfuran and isoxazole using tert-butyl nitrite (TBN) as a nitrogen source.
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Affiliation(s)
- Xuanhua Guo
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Guangqiang Xu
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Li Zhou
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
| | - Huating Yan
- College of Chemistry
- Zhengzhou University
- Zhengzhou
- China
| | - Xin-Qi Hao
- College of Chemistry
- Zhengzhou University
- Zhengzhou
- China
| | - Qinggang Wang
- Key Laboratory of Biobased Materials
- Qingdao Institute of Bioenergy and Bioprocess Technology
- Chinese Academy of Sciences
- Qingdao
- China
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43
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Yang S, Li H, Li P, Yang J, Wang L. Room temperature iron(ii)-catalyzed radical cyclization of unsaturated oximes with hypervalent iodine reagents. Org Biomol Chem 2020; 18:715-724. [DOI: 10.1039/c9ob02424g] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
An iron(ii)-catalyzed radical cyclization of oximes with hypervalent iodine reagents was developed, which enabled the construction of the isoxazoline backbone.
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Affiliation(s)
- Shichao Yang
- Department of Chemistry
- Huaibei Normal University
- Huaibei
- P.R. China
| | - Hongji Li
- Department of Chemistry
- Huaibei Normal University
- Huaibei
- P.R. China
| | - Pinhua Li
- Department of Chemistry
- Huaibei Normal University
- Huaibei
- P.R. China
| | - Jingya Yang
- Department of Chemistry
- Huaibei Normal University
- Huaibei
- P.R. China
| | - Lei Wang
- Department of Chemistry
- Huaibei Normal University
- Huaibei
- P.R. China
- State Key Laboratory of Organometallic Chemistry
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44
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Zhao G, Canterbury DP, Taylor AP, Cheng X, Mikochik P, Bagley SW, Tong R. Synthesis of 2-Arylpiperidines via Pd-Catalyzed Arylation of Aza-Achmatowicz Rearrangement Products with Arylboronic Acids. Org Lett 2019; 22:458-463. [PMID: 31880455 DOI: 10.1021/acs.orglett.9b04220] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The first Pd-catalyzed arylation of aza-Achmatowicz rearrangement products with arylboronic acids is achieved, providing versatile 2-aryldihydropyridinones for facile synthesis of highly functionalized 2-arylpiperidines. Key to this arylation is the use of non-phosphine-ligand palladium precatalyst. The substrate scope is demonstrated with >26 examples, and the utility of 2-aryldihydropyridinones is illustrated by the synthesis of a small collection of 2-arylpiperidines with substituents or functional groups at any carbon (C2-C6) as well as two NK1 receptor antagonists (+)-CP-999,94 and (+)-L-733,060.
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Affiliation(s)
- Guodong Zhao
- Department of Chemistry , The Hong Kong University of Science and Technology , Clearwater Bay, Kowloon , Hong Kong, China
| | - Daniel P Canterbury
- Worldwide Research & Development, Groton Laboratories , Pfizer, Inc. , Groton , Connecticut 06340 , United States
| | - Alexandria P Taylor
- Worldwide Research & Development, Groton Laboratories , Pfizer, Inc. , Groton , Connecticut 06340 , United States
| | - Xiayun Cheng
- Worldwide Research & Development, Groton Laboratories , Pfizer, Inc. , Groton , Connecticut 06340 , United States
| | - Peter Mikochik
- Worldwide Research & Development, Groton Laboratories , Pfizer, Inc. , Groton , Connecticut 06340 , United States
| | - Scott W Bagley
- Worldwide Research & Development, Groton Laboratories , Pfizer, Inc. , Groton , Connecticut 06340 , United States
| | - Rongbiao Tong
- Department of Chemistry , The Hong Kong University of Science and Technology , Clearwater Bay, Kowloon , Hong Kong, China
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45
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Wang XD, Zhu LH, Liu P, Wang XY, Yuan HY, Zhao YL. Copper-Catalyzed Cascade Cyclization Reactions of Diazo Compounds with tert-Butyl Nitrite and Alkynes: One-Pot Synthesis of Isoxazoles. J Org Chem 2019; 84:16214-16221. [PMID: 31779304 DOI: 10.1021/acs.joc.9b02760] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel copper-catalyzed [3 + 2] cycloaddition reaction of alkynes with nitrile oxides generated in situ from the coupling reaction of copper carbene and nitroso radical has been developed. The three-component reaction provides a simple and efficient method for the construction of isoxazoles in a highly regioselective manner in a single step. On the basis of the experimental results and density functional theory calculations, a catalytic cycle (CuI-CuII-Cu0-CuI) for this cascade cyclization reaction is proposed.
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Affiliation(s)
- Xue-Di Wang
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry , Northeast Normal University , Changchun 130024 , China
| | - Li-Han Zhu
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry , Northeast Normal University , Changchun 130024 , China
| | - Pei Liu
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry , Northeast Normal University , Changchun 130024 , China
| | - Xin-Yu Wang
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry , Northeast Normal University , Changchun 130024 , China
| | - Hai-Yan Yuan
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry , Northeast Normal University , Changchun 130024 , China
| | - Yu-Long Zhao
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry , Northeast Normal University , Changchun 130024 , China
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46
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Ou Z, Huang Q, Kou Y, Cheng F, Kalita SJ, Zhao Z, Huang Y. 1,3‐Dipolar Cycloadditions of β‐Fluoroalkyl Vinylsulfones and Nitrile Oxides for Fluoroalkylated Isoxazolines and Isoxazoles. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201900578] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Zhi Ou
- Department of Chemistry School of Chemistry, Chemical Engineering and Life ScienceWuhan University of Technology Wuhan 430070 China
| | - Qian Huang
- Department of Chemistry School of Chemistry, Chemical Engineering and Life ScienceWuhan University of Technology Wuhan 430070 China
| | - Ying‐Da Kou
- Department of Chemistry School of Chemistry, Chemical Engineering and Life ScienceWuhan University of Technology Wuhan 430070 China
| | - Feng Cheng
- Department of Chemistry School of Chemistry, Chemical Engineering and Life ScienceWuhan University of Technology Wuhan 430070 China
| | - Subarna Jyoti Kalita
- Department of Chemistry School of Chemistry, Chemical Engineering and Life ScienceWuhan University of Technology Wuhan 430070 China
| | - Zhen‐Ni Zhao
- Department of Chemistry School of Chemistry, Chemical Engineering and Life ScienceWuhan University of Technology Wuhan 430070 China
| | - Yi‐Yong Huang
- Department of Chemistry School of Chemistry, Chemical Engineering and Life ScienceWuhan University of Technology Wuhan 430070 China
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47
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Wang D, Zhang F, Xiao F, Deng GJ. A three-component approach to isoxazolines and isoxazoles under metal-free conditions. Org Biomol Chem 2019; 17:9163-9168. [PMID: 31595941 DOI: 10.1039/c9ob01909j] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A 1,3-dipolar cycloaddition of 2-methylquinoline, tert-butyl nitrite (TBN) and alkynes or alkenes for the synthesis of biheteroaryls containing both isoxazoline/isoxazole and quinoline motifs has been developed. In this protocol, TBN serves as a convenient N-O source to convert 2-methylquinoline into intermediate nitrile oxides in situ.
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Affiliation(s)
- Dahan Wang
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, Key Laboratory for Green Organic Synthesis and Application of Hunan. Province, College of Chemistry, Xiangtan University, Xiangtan 411105, China.
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48
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Zhang MX, DeHope AJ, Pagoria PF. Environmentally Benign and Scalable Preparation of Diethyl Furoxan-3,4-dicarboxylate Using Silver Carbonate as a Nitrile Oxide Generator. Org Process Res Dev 2019. [DOI: 10.1021/acs.oprd.9b00228] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Mao-Xi Zhang
- Lawrence Livermore National Laboratory, L-282, 7000 East Avenue, Livermore, California 94550, United States
| | - Alan J. DeHope
- Lawrence Livermore National Laboratory, L-282, 7000 East Avenue, Livermore, California 94550, United States
| | - Philip. F. Pagoria
- Lawrence Livermore National Laboratory, L-282, 7000 East Avenue, Livermore, California 94550, United States
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49
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Fang QY, Jin HS, Wang RB, Zhao LM. DABCO-mediated [3+3] cycloaddition of azomethine imines with in situ generated nitrile oxides from hydroximoyl chlorides. Chem Commun (Camb) 2019; 55:10587-10590. [PMID: 31418760 DOI: 10.1039/c9cc05367k] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A novel cross 1,3-dipolar cycloaddition between azomethine imines with in situ generated nitrile oxides has been developed. This is the first example of employing a reaction partner containing two heteroatoms in the [3+3] cycloaddition involving azomethine imines. This strategy not only provides structurally diverse N,O-heterocycles but also greatly enriches the chemistry of azomethine imines and nitrile oxides.
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Affiliation(s)
- Qing-Yun Fang
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, China.
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50
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Tachallait H, Driowya M, Álvarez E, Benhida R, Bougrin K. Water Promoted One-pot Three-Step Synthesis of Novel N-Saccharin Isoxazolines/Isoxazoles Using KI/Oxone Under Ultrasonic Activation. CURR ORG CHEM 2019. [DOI: 10.2174/1385272823666190621115726] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
A green and efficient regioselective protocol was developed for the preparation
of novel isoxazolines and isoxazoles of N-saccharin derivatives via the water-promoted cycloaddition
reaction of nitrile oxides with alkenes and alkynes. It is noteworthy that
KI/Oxone/water-promoted one-pot three-component reactions of aldehyde, hydroxylamine
hydrochloride, and alkene or alkyne were observed to be very satisfactory. The synthesis
of all adducts (4a-j/5a-j) has been carried out by this method with high to excellent yields
(70-95%) at 25°C within 30 min, using ultrasonic probe. All the new compounds were
thoroughly characterized by spectroscopic techniques and also 5b, 5c and 5f were structurally
identified by single-crystal X-ray diffraction methods. X-ray crystallography structure
analysis clearly supported the regioselectivity of the cycloaddition reaction.
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Affiliation(s)
- Hamza Tachallait
- Department of Chemistry, Equipe de Chimie des Plantes et de Synthese Organique et Bioorganique, URAC23, Faculty of Science, B.P. 1014, GEOPAC Research Center, Mohammed V University, Rabat, Morocco
| | - Mohsine Driowya
- Department of Chemistry, Equipe de Chimie des Plantes et de Synthese Organique et Bioorganique, URAC23, Faculty of Science, B.P. 1014, GEOPAC Research Center, Mohammed V University, Rabat, Morocco
| | - Eleuterio Álvarez
- Instituto de Investigaciones Quimicas, CSICUniversidad de Sevilla, Avda. Americo Vespucio, 49, Isla de La Cartuja, 41092 Sevilla, Spain
| | - Rachid Benhida
- Universite Cote d'Azur, CNRS, Institut de Chimie de Nice UMR 7272, 06108 Nice, France
| | - Khalid Bougrin
- Department of Chemistry, Equipe de Chimie des Plantes et de Synthese Organique et Bioorganique, URAC23, Faculty of Science, B.P. 1014, GEOPAC Research Center, Mohammed V University, Rabat, Morocco
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