The use N‐sulfonyl‐protected hydroxylamines as bi‐nucleophiles in iron‐catalyzed propargylic substitutions allows the selective one‐potsynthesis of four classes of substituted isoxazoles or isoxazolines from the same propargylic alcohols (21 examples) by simply tuning the nature of the base. By using an iron(III) catalyst and a base such as triethylamine (3 equiv), isoxazoles 3 are obtained in good
Highly Diastereoselective Baldwin Rearrangement of Isoxazolines into <i>cis</i>-Acylaziridines
作者:Eric Gayon、Olivier Debleds、Marie Nicouleau、Frederic Lamaty、Arie van der Lee、Emmanuel Vrancken、Jean-Marc Campagne
DOI:10.1021/jo101273d
日期:2010.9.3
An atom-economical and practical synthesis of cis-N-benzenesulfonamide acylaziridines through the Baldwin rearrangement of various N-benzenesulfonamide isoxazolines has been reported. A detailed experimental study revealed the beneficial effect of microwaves and pointed out the crucial role of the temperature in the reaction course. Moderate to good yields and excellent cis stereoselectivities were