Efficient and Regioselective Synthesis of 5-Hydroxy-2-isoxazolines: Versatile Synthons for Isoxazoles, β-Lactams, and γ-Amino Alcohols
摘要:
An efficient and highly regioselective protocol was developed for the preparation of 5-hydroxy-2-isoxazolines, which have been proved to be versatile synthons for isoxazles, beta-hydroxy oximes, and gamma-amino alcohols. beta-Lactams, commonly embedded in the skeletons of bioactive natural products, were also synthesized in two steps from beta-hydroxy oximes, providing a new strategy for the synthesis of this kind of compounds.
Three heterocycles from one starting material: A divergent method for the synthesis of isoxazolines, isoxazoles, and 5-hydroxy-2-isoxazolines from oximes is developed using TEMPO as a radical initiator. Oxidants control the selectivity of the product formations.
来自一种原料的三个杂环:使用 TEMPO 作为自由基引发剂开发了一种从肟合成异恶唑啉、异恶唑和 5-羟基-2-异恶唑啉的不同方法。氧化剂控制产物形成的选择性。
Metal-free cascade synthesis of unsymmetrical 2-aminopyrimidines from imidazolate enaminones
作者:Xue Cui、Jianting Ma、Tingting Zeng、Junyu Xu、Youbin Li、Xuesong Wang
DOI:10.1039/d1ra04319f
日期:——
metal-free synthesis of unsymmetrical 2-aminopyrimidines from imidazolate enaminones has been developed. In this procedure, various structural 2-aminopyrimidines, as well as 4,5-dihydroisoxazol-5-ols and pyrazoles were synthesized in moderate to excellent yields. A plausible mechanism was also proposed for the cascade reaction. This method represents an effective strategy towards the synthesis of unsymmetrical