Gold(<scp>i</scp>) catalysed regio- and stereoselective intermolecular hydroamination of internal alkynes: towards functionalised azoles
作者:Christophe Michon、Joachim Gilbert、Xavier Trivelli、Fady Nahra、Catherine S. J. Cazin、Francine Agbossou-Niedercorn、Steven P. Nolan
DOI:10.1039/c9ob00587k
日期:——
Gold(I) catalysed regio- and stereoselective intermolecular hydroamination of internal alkynes was developed for the effective synthesis of a series of (Z)-functionalised vinylazoles under solvent free conditions. The catalytic hydrogenation of the resulting enamines leads to substituted saturated azoles in good yields.
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.