A general access to isoxazoles with outstanding functional group compatibility from the readily available ynones using trimethylsilyl azide as an amino surrogate under exceptionally simple conditions is described.
Rao,K.S.R.K.M.; Rao,N.V.S., Indian Journal of Chemistry, 1968, vol. 6, p. 66 - 68
作者:Rao,K.S.R.K.M.、Rao,N.V.S.
DOI:——
日期:——
Synthesis of 3,5-Disubstituted Isoxazoles through a 1,3-Dipolar Cycloaddition Reaction between Alkynes and Nitrile Oxides Generated from <i>O</i>
-Silylated Hydroxamic Acids
by 1,3‐dipolar cycloaddition between alkynyl dipolarophiles and nitrile oxide dipoles generated in‐situ from O‐silylated hydroxamicacids in the presence of trifluoromethanesulfonic anhydride and NEt3. Thanks to the mild, metal‐free and oxidant‐free conditions that this strategy offers, the reaction was successfully applied to a wide variety of alkynyl dipolarophiles, demonstrating the tolerance of this