Synthesis of 3-Acyl-isoxazoles and Δ<sup>2</sup>-Isoxazolines from Methyl Ketones, Alkynes or Alkenes, and <i>tert</i>-Butyl Nitrite via a Csp<sup>3</sup>–H Radical Functionalization/Cycloaddition Cascade
A novel metal-free tandem Csp3–H bond functionalization of ketones and 1,3-dipolar cycloaddition has been developed. An efficient approach to a variety of oxazole and isoxazoline derivatives is demonstrated using the 1,3-dipolar cycloaddition of alkynes and alkenes to nitrile oxides generated by reactions of methylketones with tert-butyl nitrite. This new protocol provides access to a variety of isoxazolines
Exploiting the 1,3-dithiane of 2-oxopropanenitrile oxide to limit competing dimerization in 1,3-dipolar cycloaddition reactions
作者:Stuart J. Barrow、Christopher J. Easton、G.Paul Savage、Gregory W. Simpson
DOI:10.1016/s0040-4039(97)00275-x
日期:1997.3
The 1,3-dithiane of 2-oxopropanenitrile oxide is less prone to dimerization than the parent compound and, as a consequence, it undergoes more efficient cycloaddition reactions with a range of mono- and 1,1- and 1,2-di-substituted alkenes.