Stereoselective Synthesis of Fluoroalkenoates and Fluorinated Isoxazolidinones: N-Substituents Governing the Dual Reactivity of Nitrones
作者:G. K. Surya Prakash、Zhe Zhang、Fang Wang、Martin Rahm、Chuanfa Ni、Marc Iuliucci、Ralf Haiges、George A. Olah
DOI:10.1002/chem.201303509
日期:2014.1.13
α‐Fluoroalkenoates and 4‐fluoro‐5‐isoxazolidinones are of vast interest due to their potential biological applications. We now demonstrate the syntheses of (E)‐α‐fluoroalkenoates and 4‐fluoro‐5‐isoxazolidinones by the reactions between nitrones and α‐fluoro‐α‐bromoacetate. By altering N‐substituents in nitrones, (E)‐α‐fluoroalkenoates and 4‐fluoro‐5‐isoxazolidinones can be achieved, respectively, with
α-氟链烯酸酯和4-氟-5-异恶唑烷酮因其潜在的生物学应用而备受关注。现在,我们通过硝酮与α-氟代-α-溴乙酸酯之间的反应证明(E)-α-氟代链烯酸酯和4-氟代-5-异恶唑烷酮的合成。通过改变硝酮中的N-取代基,可以实现高化学选择性和立体选择性,分别获得(E)-α-氟代链烯酸酯和4-氟-5-异恶唑烷酮。已经进行了实验和计算研究以阐明反应机理。线性自由能关系研究进一步表明,N取代基效应主要是电子起源的。