Efficient synthesis of 1,2,4-oxadiazine-5-ones via [3+3] cycloaddition of in situ generated aza-oxyallylic cations with nitrile oxides
作者:Gangqiang Wang、Rongxing Chen、Sen Zhao、Liangfeng Yang、Haibing Guo、Shaofa Sun、Jian Wang、Justin Domena、Yalan Xing
DOI:10.1016/j.tetlet.2018.04.025
日期:2018.5
1,2,4-Oxadiazin-5-ones were prepared via [3+3] cycloaddition of in situ generated aza-oxyallylic cations with nitrile oxides in good yields and excellent functional group compatibility. This efficient transformation is metal-free and is promoted by an inorganic base Cs2CO3. In addition, this reaction features simple-operation, mild conditions, and high regioselectivity.
1,2,4-Oxadiazin-5-ones是通过[3 + 3]环合成原位生成的氮杂-氧烯丙基阳离子与腈氧化物而制备的,具有良好的收率和出色的官能团相容性。这种有效的转变是无金属的,并由无机碱Cs 2 CO 3促进。另外,该反应具有操作简单,条件温和和区域选择性高的特征。