作者:Frank W. Eastwood、Patrick Perlmutter、Qi Yang
DOI:10.1039/a604091h
日期:——
The efficiency of the ring enlargement of 2-substituted
N-acylaziridines to dihydrooxazoles followed by nickel peroxide
oxidation to give 2,4-disubstituted oxazoles as a synthetic route is
examined. Sodium iodide-promoted ring enlargements work well for
N-acylaziridines bearing electron-donating 2-substituents. For
N-acylaziridines bearing electron-withdrawing 2-substituents,
the best results are obtained using acid-promoted
rearrangement.
本研究考察了将 2-取代的 N-酰基氮丙啶扩环为二氢噁唑,然后通过过氧化镍氧化得到 2,4-二取代噁唑的合成路线的效率。碘化钠促进的扩环对带有电子捐献型 2-取代基的 N-酰基吖嗪类效果良好。而对于含有抽电子 2-取代基的 N-酰基吖嗪类化合物,使用酸促进重排法则能获得最佳效果。