The Preparation of 2-Isoxazolines from <i>O</i>-Propargylic Hydroxylamines via a Tandem Rearrangement-Cyclisation Reaction
作者:Stephen Lindell、Lewis Pennicott
DOI:10.1055/s-2006-926232
日期:——
A method for the conversion of O-propargylic hydroxylamines into 2-isoxazolines in 60-84% yield is described. For 3-alkylpropargyl or 3-arylpropargyl hydroxylamines this was achieved by heating a methanolic solution of the hydrochloride salt in the presence of K2CO3. In the case of the 3-unsubstituted compounds, the hydrochloride salts were first converted to the free bases, which rearranged upon heating