Generalized Method for the Production of 1,3‐Benzoxazine, 1,3‐Benzothiazine, and Quinazoline Derivatives from 2‐(Hydroxy, Thio, or Amino) Aromatic Acids Using Triphenylphosphine Thiocyanogen
作者:Kaylene M. Pritchard、Jasim M. Al‐Rawi、Andrew B. Hughes
DOI:10.1081/scc-200061564
日期:2005.6.1
derivatives has been achieved, respectively. It was also found that 3‐hydroxypyridine‐2‐carboxylic acid and 2‐hydroxynicotinic acid using a modified method gave 2‐thioxo‐2,3‐dihydro‐4H‐pyrido[2,3‐e][1,3]oxazin‐4‐one and 2‐thioxo‐2,3‐dihydro‐4H‐pyrido[3,2‐e][1,3]oxazin‐4‐one, respectively. The structures of the new compounds were confirmed by the analysis of their IR, 1H, and 13C NMR spectra.
摘要 开发了一种改进的一锅法合成 1,3-苯并恶嗪,其中省略了不稳定硫氰的制备。发现该方法适用于取代(甲基、甲氧基、卤素和羟基)2-羟基苯甲酸和 2-羟基萘甲酸。该方法扩展到 2-硫代、2-氨基和 N-甲基氨基苯甲酸,分别实现了 1,3-苯并噻嗪和喹唑啉衍生物的合成。还发现使用改进方法的 3-羟基吡啶-2-羧酸和 2-羟基烟酸得到 2-硫代-2,3-二氢-4H-吡啶并[2,3-e][1,3]恶嗪-分别为 4-one 和 2-thioxo-2,3-dihydro-4H-pyrido[3,2-e][1,3]oxazin-4-one。新化合物的结构通过其 IR、1H 和 13C NMR 光谱的分析得到证实。