were obtained from the reaction of primary nitro compounds [methyl nitroacetate, 2-nitro-1-phenylethanone, (nitromethyl)benzene, 1-nitropropane, and (phenylsulfonyl)nitromethane] with dipolarophiles in refluxing mesitylene in the presence of a small amount of p-toluenesulfonic acid. The formation of these products can be explained in terms of 1,3-dipolar cycloaddition of nitrileoxide generated by a
Synthesis of pyrrolo[3,4-d]isoxazolines via a one-pot radical functionalization/cycloaddition of methyl ketone, tert-butyl nitrite, and maleimide
作者:Hang Wang、Rui Cheng、Gangqiang Wang、Yang Shi、Jian Wang、Haibing Guo、Leslie Trigoura、Yalan Xing、Shaofa Sun
DOI:10.1016/j.tetlet.2020.151652
日期:2020.3
The development of tandem radical Csp3-H functionalization/ cycloaddition of methylketone, tert-butyl nitrite, and maleimide has been reported herein. A variety of pyrrolo[3,4-d]isoxazolines have been successfully synthesized under metal-free conditions with excellent functional group compatibility. X-ray crystallography of the pyrrolo[3,4-d]isoxazoline was obtained and the reaction mechanism was
Catalyst-Free Formation of Nitrile Oxides and Their Further Transformations to Diverse Heterocycles
作者:Luca De Angelis、Alexandra M. Crawford、Yong-Liang Su、Daniel Wherritt、Hadi Arman、Michael P. Doyle
DOI:10.1021/acs.orglett.0c04130
日期:2021.2.5
transfer from tert-butyl nitriteundermildconditions and without the use of a catalyst or an additive is reported. This transformation is broadly applicable to the synthesis of furoxans by dimerization and isoxazoles and isoxazolines by cycloaddition. This methodology is also applied for the millimole-scale synthesis of two biologically active compounds. The formation of the nitrile oxide from a diazoacetamide