Results 231 to 240 of about 8,819 (284)

Asymmetric synthesis of chiral spiro bis(isoxazoline) and spiro (isoxazole–isoxazoline) ligands

Tetrahedron: Asymmetry, 2010
Abstract Asymmetric synthesis of novel chiral ligands, bis(isoxazoline) on a spiro[4.4]nonane scaffold and isoxazole–isoxazoline on a spiro[4.5]decane scaffold, has been achieved by utilizing an enantiomerically pure alcohol as the starting material.
Toyohiro Nagano, Hiroaki Sasai, Kazuhiro Takenaka, Shinobu Takizawa   +3 more
openaire   +2 more sources

ChemInform Abstract: Oxidative Conversion of Isoxazolidines to Isoxazolines.

ChemInform, 1998
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
and Lihong Sun, Hung-Jang Gi, Kang Zhao, Pan Li   +3 more
openaire   +3 more sources

Metal-free oxysulfonylation and aminosulfonylation of alkenyl oximes: synthesis of sulfonylated isoxazolines and cyclic nitrones.

Organic and biomolecular chemistry, 2019
Intramolecular oxysulfonylation of alkenyl oximes was reported. Using iodine as the catalyst, TBHP as the oxidant, and sulfonyl hydrazides as the sulfonyl radical source, a variety of sulfonylated isoxazolines were obtained in moderate to excellent ...
Zhong-Qi Xu, Lin-Chuang Zheng, Lin Li, Lili Duan, Yue‐Ming Li   +4 more
semanticscholar   +1 more source

Conversion of 2-isoxazolines to isoxazoles

Tetrahedron, 1965
Abstract A convenient and easy conversion of 2-isoxazolines to isoxazoles is described. The reaction proceeds via N-bromosuccinimide bromination and subsequent dehydrobromination with bases, and has considerable application both to alkyl- and aryl-mono and and 3,5-disubsituted 2-isoxazolines.
G. Bianchi, Paolo Grünanger
openaire   +2 more sources

Steroidal isoxazoles, isoxazolines and isoxazolidines [PDF]

Journal of Heterocyclic Chemistry, 1998
AbstractThe present review considers new useful heterocyclosteroids which contain five‐membered heterocyclic systems, namely, isoxazoles, isoxazolines and isoxazolidines, condensed to the cyclopentanoperhy‐drophenanthrene skeleton, in different positions of the molecule, with changes in their physiological activity and the appearance of new interesting
Sotiris S. Nikolaropoulos, Ch. Camoutsis
openaire   +2 more sources

Water-Assisted Nitrile Oxide Cycloadditions: Synthesis of Isoxazoles and Stereoselective Syntheses of Isoxazolines and 1,2,4-Oxadiazoles.

Angewandte Chemie, 2016
Conventional methods generate nitrile oxides from oxime halides in organic solvents under basic conditions. However, the present work revealed that water-assisted generation of nitrile oxides proceeds under mild acidic conditions (pH 4-5). Cycloadditions
Chatchai Kesornpun, T. Aree, C. Mahidol, S. Ruchirawat, P. Kittakoop   +4 more
semanticscholar   +1 more source

Structure and stability of isoxazoline compounds [PDF]

Russian Journal of General Chemistry, 2013
Structure of isoxazoline compounds formed via the reaction of alkyl-substituted benzonitrile oxides with ethylene was determined by X-ray diffraction method. Isoxazoline ring is flattened, the bond lengths in it depend slightly on the nature of substituents (CH3, C2H5) and their position in the benzene ring and the angle of rotation relative to the ...
T. K. Goncharov, Z. G. Aliev, Sergey M. Aldoshin, V. V. Dubikhin, E. L. Ignat’eva, G. M. Nazin   +5 more
openaire   +1 more source

General 5-Halomethyl Isoxazolines Synthesis Enabled by Copper-Catalyzed Oxyhalogenation of Alkenes.

Journal of Organic Chemistry, 2019
A general and efficient oxyhalogenation of unsaturated ketoximes has been achieved through copper catalysis with diethyl bromomalonate, NCS and NIS, yielding 5-chloromethyl, 5-bromomethyl as well as 5-iodomethyl isoxazolines in good to excellent yields.
Xiaoqing Li, Yu Ding, Lijie Qian, Yang Gao, Xinqiang Wang, Xinhuan Yan, Xiangsheng Xu   +6 more
semanticscholar   +1 more source

2‐Isoxazoline derivatives. Part I. A base‐promoted fragmentation of 2‐isoxazolines

Journal of Heterocyclic Chemistry, 1968
AbstractThe action of bases on 3‐aryl (or alkyl)‐5‐acyl‐2‐isoxazolines has been shown to give rise to the corresponding aromatic (or aliphatic) nitriles and α‐diketones by cleavage of the O‐N and C3C4 bonds of the heterocyclic ring. This fragmentation reaction has been extended to other 2‐isoxazolines substituted in the 5‐position with electron ...
Remo Gandolfi, Giorgio Bianchi, Paolo Grünanger   +2 more
openaire   +2 more sources

ChemInform Abstract: Highly Effective Dehydrogenation of Steroidal Isoxazolines. [PDF]

ChemInform, 1990
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
R. P. Litvinovskaya, A. V. Baranovskii, Vladimir A. Khripach   +2 more
openaire   +2 more sources