4<i>H</i>-1,2-Benzoxazines with Electron-Withdrawing Substituents on the Benzene Ring: Synthesis and Application as Potent Intermediates for Oxygen-Functionalized Aromatic Compounds
作者:Satoshi Nakamura、Masanobu Uchiyama、Tomohiko Ohwada
DOI:10.1021/ja0343151
日期:2003.5.1
4H-1,2-benzoxazine rings functionalized with various electron-withdrawing substituents on the benzene ring. Furthermore, we also show that the resulting 4H-1,2-benzoxazines can be used as precursors of functionalized o-quinone methides and multisubstituted phenols. This type of heterocycle can be a potent intermediate to oxygen-fuctionalized aromatic compounds.
描述了一种合成功能化 4H-1,2-苯并恶嗪衍生物的新通用方法。尽管4H-1,2-苯并恶嗪是恶嗪基团的基本结构之一,但尚未建立杂环的通用合成方法。我们发现当用过量的三氟甲磺酸处理 2-硝基-3-苯基丙酸甲酯时,3-甲氧基羰基-4H-1,2-苯并恶嗪以良好的收率获得。该方法也适用于合成在苯环上用各种吸电子取代基官能化的 4H-1,2-苯并恶嗪环。此外,我们还表明所得 4H-1,2-苯并恶嗪可用作功能化邻醌甲基化物和多取代酚的前体。这种类型的杂环可以成为氧功能化芳族化合物的有效中间体。