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
描述了一种以 60-84% 的产率将 O-炔丙基羟胺转化为 2-异恶唑啉的方法。对于3-烷基炔丙基或3-芳基炔丙基羟胺,这是通过在K 2 CO 3 存在下加热盐酸盐的甲醇溶液来实现的。在 3-未取代化合物的情况下,盐酸盐首先转化为游离碱,在甲醇中加热后重新排列。在一个案例中,通过在室温下用甲基肼处理超过 19 小时,该方法被扩展为能够以 65% 的产率将邻炔丙基邻苯二甲酰亚胺直接转化为 2-异恶唑啉。