Three-component synthesis of fluorinated pyrazoles from fluoroalkylamines, NaNO<sub>2</sub> and electron-deficient alkynes
作者:Pavel K. Mykhailiuk
DOI:10.1039/c4ob02670e
日期:——
Three-component reaction between RCF2CH2NH2.HCl, NaNO2 and electron-deficient alkynes significantly depends on substituent "R". The reaction gives the fluorinated pyrazoles in high yields when "R" is a fluorine atom or a fluoroalkyl group. With other "R" unexpected products are formed.
gel-supported sodium hydrogen sulfate (NaHSO4/SiO2) or Amberlyst 15 as solid acid catalyst, and then the corresponding 3-acylisoxaszoles were obtained by reacting with alkynes via the 1,3-dipolar [3+2] cycloaddition. These heterogeneous catalysts are easily separable from the reaction mixture and reused. This synthetic method provides a facile, efficient, and reusable production of 3-acylisoxazoles.
Acid-catalyzed nitronate cycloaddition reactions. Useful syntheses and simple transformations of 3-acyl- and 3-alkenylisoxazolines
作者:Peter A. Wade、Nayan V. Amin、Hwa Kwo Yen、David T. Price、George F. Huhn
DOI:10.1021/jo00198a005
日期:1984.11
A Convenient Synthetic Method of Isoxazole Derivatives Using Copper(II) Nitrate
作者:Ken-ichi Itoh、Tadashi Aoyama、Hiroaki Satoh、Kenta Hasegawa、Natsumi Meguro、Akira C. Horiuchi、Toshio Takido、Mitsuo Kodomari
DOI:10.3987/com-14-12979
日期:——
3-Acetylisoxazoles were synthesized by the reaction of alkenes or alkynes in acetone as solvent with copper(II) nitrate and formic acid. In the case of ethyl acetate as solvent, 3-benzoylisoxazoles were yielded by the reaction of alkynes and acetophenone with copper(II) nitrate and nitric acid. This synthetic method provides a convenient production of isoxazole derivatives.
Application of silica gel-supported polyphosphoric acid (PPA/SiO2) as a reusable solid acid catalyst to the synthesis of 3-benzoylisoxazoles and isoxazolines
3-Benzoylisoxazoles were synthesized by the reaction of alkynes and benzoylnitromethane using silica gel-supported polyphosphoric acid (PPA/SiO2). This reaction provides a convenient, efficient, and reusable synthetic method of isoxazole derivatives. (C) 2011 Elsevier Ltd. All rights reserved.