5050-64-6Relevant academic research and scientific papers
Arylboronic Acid Catalyzed Dehydrative Mono-/Dialkylation Reactions of β-Ketoacids and Alcohols
Feng, Juhua,Hu, Haipeng,Ni, Hailiang,Qiu, Yuqian,Wang, Cuilin,Wang, Guangtu,Wang, Hanguang,Wang, Wei,Wu, Xin,Yue, Guizhou,Zou, Ping
, p. 832 - 836 (2022/02/05)
The dehydrative mono-/dialkylation reactions of alcohols and β-ketoacids were realized under arylboronic acid catalysis, furnishing a series of β-aryl ketones and β-ketoesters in yields of 15–99%, with CO2 and H2O being the byproduct
Preparation method of 4, 5-dihydroisoxazole derivative
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Paragraph 0073-0083; 0140-0146, (2021/02/13)
The invention discloses a preparation method of a 4, 5-dihydroisoxazole derivative, and relates to a prepartion method of a 4, 5-dihydroisoxazole derivative represented by formula (II). The method comprises the steps: reacting hydroxylamine hydrochloride
TEMPO-Mediated Selective Synthesis of Isoxazolines, 5-Hydroxy-2-isoxazolines, and Isoxazoles via Aliphatic δ-C(sp3)-H Bond Oxidation of Oximes
Mondal, Santanu,Biswas, Sourabh,Ghosh, Krishna Gopal,Sureshkumar, Devarajulu
, p. 2439 - 2446 (2021/08/03)
Selective synthesis of three different bioactive heterocycles; isoxazolines, 5-hydroxy-2-isoxazolines and isoxazoles from the same starting material using TEMPO (2,2,6,6-Tetramethylpiperidin-1-oxyl) as a radical initiator is reported. Selectivity was achi
Selectfluor-Bu4NI-Mediated C(sp3)-H Oxidation in Aqueous Media: Synthesis of Δ2-Isoxazolines from Oximes
Shi, Di,Qin, Hai-Tao,Zhu, Chen,Liu, Feng
supporting information, p. 5084 - 5088 (2015/08/18)
The direct functionalization of an aliphatic C-H bond within a complex molecule through a free-radical pathway is a valuable tool in synthetic chemistry. Herein, we developed an efficient transition-metal-free approach to generate Δ2-isoxazolines from oximes by radical-mediated C(sp3)-H oxidation. Investigation of the mechanism suggested that in the presence of Selectfluor and Bu4NI, the homolysis of the in situ formed O-I bond generated an iminoxyl radical that facilitated subsequent 1,5-H transfer and C(sp3)-H oxidation. The title reaction involves Selectfluor-Bu4NI-mediated C-O bond formation in aqueous media under metal-free conditions. A variety of Δ2-isoxazolines are directly synthesized from oximes by remote intramolecular functionalization of C(sp3)-H bonds.
TEMPO-mediated aliphatic C-H Oxidation with Oximes and hydrazones
Zhu, Xu,Wang, Yi-Feng,Ren, Wei,Zhang, Feng-Lian,Chiba, Shunsuke
, p. 3214 - 3217 (2013/07/26)
A method for aliphatic C-H bond oxidation of oximes and hydrazones mediated by 2,2,6,6-tetramethylpiperidin-1-oxyl (TEMPO) has been developed, which enables the concise assembly of substituted isoxazole and pyrazole skeletons.
Insertion of Nitrogen Oxide and Nitrosonium Ion into the Cyclopropane Ring: A New Route to 2-Isoxazolines and its Mechanistic Studies
Mizuno, Kazuhiko,Ichinose, Nobuyuki,Tamai, Toshiyuki,Otsuji, Yoshio
, p. 4669 - 4675 (2007/10/02)
The 9,10-dicyanoanthracene (DCA)-sensitized photoreaction of 1,2-diarylcyclopropanes 1a-d in nitrogen oxide (NO)-saturated CH3CN afforded 3,5-diaryl-2-isoxazolines 2a-d in excellent yields.The reaction of 1a-d with NOBF4 or with a mixture of NO and O2 in
Formation of 2-Substituted 2-Isoxazolinium Salts by the Reaction of 1,1,2,2-Tetrasubstituted Cyclopropanes with NOBF4
Ichinose, Nobuyuki,Mizuno, Kazuhiko,Otsuji, Yoshio
, p. 457 - 458 (2007/10/02)
The reaction of 1,1,2,2-tetraphenyl- and 1-methyl-1,2,2-triphenylcyclopropanes with NOBF4 gave 2-phenyl-2-isoxazolinium tetrafluoroborates via the phenyl migration from 3-phenyl-2-isoxazolidinium or 1-isoxazolinium intermediates.
Thermal Decomposition of Silver Salts of Aryldinitromethanes in the Presence of Unsaturated Systems. Possible Formation of Arylnitrocarbenes
Coutouli-Argyropoulou, E.,Alexandrou, N.E.
, p. 4158 - 4162 (2007/10/02)
Decomposition of several silver salts of aryldinitromethanes at 100 deg C in the presence of 1,1-diarylethylenes leads to the formation of Δ2-isoxazoline N-oxides in moderate yields and to Δ2-isoxazolines as byproducts. The spectral data of the new compou
