18753-56-5Relevant articles and documents
Green preparation method of isoxazole compound participating in water-soluble vitamin E
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Paragraph 0141-0144, (2021/11/03)
The invention provides a green synthesis method of an isoxazole compound represented by the formula (III), wherein the aldehyde oxime compound represented by the formula (I) is a substrate and is in an aqueous solution of a surfactant with a mass concentration 1 wt % - 5 wt % in N - chlorosuccinimide. The alkyne compound represented by the formula (II) is reacted 6 - 16h at room temperature under the common action of the basic substance, and the resulting reaction solution is post-treated to obtain the isoxazole compound represented by the formula (III). Water serves as a reaction solvent, the use amount of the organic solvent is reduced, and zero emission of the solvent is realized.
A direct access to isoxazoles from ynones using trimethylsilyl azide as amino surrogate under metal/catalyst free conditions
Kumar, Gadi Ranjith,Kumar, Yalla Kiran,Reddy, Maddi Sridhar
supporting information, p. 6589 - 6592 (2016/06/01)
A general method for isoxazoles from readily available ynones using trimethylsilyl azide as an amino surrogate, likely via an unprecedented hydroazidation of the alkyne and denitrogenative cyclization, is demonstrated. The method neither required any cata
Synthesis of 3,5-disubstituted isoxazoles via cope-type hydroamination of 1,3-dialkynes
Wang, Liangguang,Yu, Xiaoqiang,Feng, Xiujuan,Bao, Ming
, p. 2418 - 2421 (2012/07/13)
An efficient method for the synthesis of 3,5-disubstituted isoxazoles is described. The reactions of 1,3-dialkynes with hydroxylamine proceeded smoothly in DMSO under mild reaction conditions to produce 3,5-disubstituted isoxazoles in satisfactory to excellent yields.
Application of [3+2]-cycloaddition in the synthesis of valdecoxib
Reddy, Anumula Raghupathi,Goverdhan, Gilla,Sampath, Aalla,Mukkanti, Khagga,Reddy, Padi Pratap,Bandichhor, Rakeshwar
, p. 639 - 649 (2012/01/13)
A large scale synthesis of valdecoxib 1 is described. Our work features potential application of [3+2]-dipolar cycloaddition involving enamine and in situ-generated nitrile oxide derivatives. Dr. Reddy's Laboratories Ltd.
METHODS FOR THE SYNTHESIS OF HETEROAROMATIC COMPOUNDS
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Page/Page column 38, (2008/06/13)
Methods of making heteroaromatic compounds comprising a 5- membered ring, and dihydro forms thereof, by a metal catalysed 5-endo-cyclisation of alkynes (acetylenes) are disclosed. The methods involve the use of a catalyst comprising a silver salt, more preferably a silver (I) salt, which is employed as a heterogeneous catalyst for the cyclisation reaction. The methods can produce different types of heteroaromatic compounds and are capable of producing highly substituted products, i.e. products in which the 5-membered ring is disubstituted, trisubstituted or, with further simple reactions, tetrasubstituted. The methods described herein generally the advantages that they use conditions and reagents that are benign, cheap and flexible and amenable to scale up, and in which the only by-product is water.