The liquid-phase synthesis of oxadiazolines via 1,3-dipolar cycloaddition reaction on poly(ethylene glycol) support (PEG) is described. 1,3-Dipolar cycloadditions of nitrile oxide generated in situ on soluble polymer with a variety of imines provided a library of 1,2,4-oxadiazolines in good yields and purity. The reactions were run in the homogeneous phase and the synthetic sequences were performed in parallel one-pot fashion. Quantitative conversion in the 1,3-dipolar cycloaddition reaction was verified by 1H NMR analysis. The polymer bound products were isolated in excellent yields by simple precipitation of the soluble support.
描述了通过聚
乙二醇载体 (P
EG) 上的 1,3-偶极环加成反应液相合成恶二唑啉。在可溶性聚合物上原位产生的氧化腈与各种
亚胺的 1,3-偶极环加成反应提供了具有良好产率和纯度的
1,2,4-恶二唑啉库。反应在均相中进行,合成序列以平行一锅法进行。 1,3-偶极环加成反应中的定量转化率通过 1 H NMR 分析进行验证。通过可溶性载体的简单沉淀,以优异的产率分离出聚合物结合的产物。