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.
A practical, general protocol for the synthesis of a broad range of α-ketothioamides via denitration of readily available α-nitroketones with sulfur and amines has been reported.
Trimethylsilylnitrate−Chromium Trioxide and Trimethylsilylnitrate−DMSO: Novel Reagent Systems for One Step Conversion of Olefins into α-Nitro Ketones and Cyclic Ethers into Lactones<sup>1</sup>
作者:Shatrughan P. Shahi、Anuradha Gupta、Sangeeta V. Pitre、M. Venkat Ram Reddy、R. Kumareswaran、Yashwant D. Vankar
DOI:10.1021/jo980167z
日期:1999.6.1
Peroxy nitrates. Unstable products of olefin nitration with dinitrogen tetroxide in the presence of oxygen. New route to .alpha.-nitroketones