Pd(II)-Catalyzed Synthesis of Benzisoxazolones from Benzohydroxamic Acids via C–H Activation
摘要:
A Pd-catalyzed method for the synthesis of benzisoxazolones from benzohydroxamic acids using Oxone as an oxidant in a one-pot procedure has been developed. In this process, the reaction appears to be suitable for construction of various benzisoxazolones.
Chemistry of 5-oxodihydroisoxazoles. Part 18.1 Synthesis of oxazoles by the photolysis and pyrolysis of 2-acyl-5-oxo-2,5-dihydroisoxazoles
作者:Rolf H. Prager、Jason A. Smith、Ben Weber、Craig M. Williams
DOI:10.1039/a700134g
日期:——
N-Acylisoxazol-5-ones lose carbon dioxide under
photochemical and thermal conditions affording iminocarbenes which
undergo intramolecular cyclisation through the oxygen of the acyl group
to give oxazoles. Under photochemical conditions those acylisoxazolones
with electron withdrawing groups at C-4 usually give high yields of
oxazoles, while those with electron donating groups at C-4 give only
poor yields: the reverse is observed under thermal conditions.
Mild Oxidation of Diarylacetylenes to 1,2-Diketones Using Oxone in Trifluoroacetic Acid
作者:Ming-Jung Wu、Jean-Ho Chu、Yen-Ju Chen
DOI:10.1055/s-0029-1216800
日期:2009.7
A variety of 1,2-diaryldiketones were synthesized in 15-90% yields by treatment of diarylacetylenes with Oxone as the oxidant in trifluoroacetic acid. Oxidation of 1-nitro-2-(phenylethynyl)benzene and 2,4′-(ethyne-1,2-diyl)bis(nitrobenzene) furnished 1-benzoylbenzo[c]isoxazol-3(1H)-one and benzo[c]isoxazol-3-yl(4-nitrophenyl)methanone as the major products, respectively.
Reaction of 2,3-epoxy-3-(2-nitrophenyl)propiophenone(2-nitrochalcone epoxide) with hydrogen chloride
作者:Ian P. Sword
DOI:10.1039/j39710000820
日期:——
The reaction of 2,3-epoxy-3-(2-nitrophenyl)propiophenone(2-nitrochalconeepoxide) with ethereal hydrogenchloride gives 6-chloro-1,3-dihydroxy-2-phenylquinolin-4(1H)-one; the corresponding unchlorinated product is obtained in the presence of quinol.