Synthesis of 1-Amino-2-naphthalenecarboxylic Acid Derivatives via the Intramolecular Cyclization of 4-(2-Cyanophenyl)-2-butenoic Acid Derivatives and Its Application to the One-Pot Preparation of Benzo[<i>h</i>]quinazoline-2,4(1<i>H</i>,3<i>H</i>)-diones
作者:Kazuhiro Kobayashi、Hiroto Tanaka、Harumi Takabatake、Tomohide Kitamura、Ryoji Nakahashi、Osamu Morikawa、Hisatoshi Konishi
DOI:10.1246/bcsj.72.1071
日期:1999.5
The reaction of 2-(lithiomethyl)benzonitrile with 2-phenylthio-2-alkenoic acid derivatives in diglyme at −78 °C, followed by oxidation with sodium metaperiodate in aqueous MeOH at room temperature and the subsequent elimination reaction in refluxing toluene, gave 4-(2-cyanophenyl)-2-butenoic acid derivatives in moderate-to-fair overall yields. Intramolecular cyclization of these products using NaH in DMF at 0 °C gave 1-amino-2-naphthalenecarboxylic acid derivatives almost quantitatively. Successive treatments with an isocyanate without isolation of the aminonaphthalenecarboxylates under reflux afforded benzo[h]quinazoline-2,4(1H,3H)-diones in moderate-to-good yields.
2- (lithiomethyl)苯甲腈与 2-苯硫基-2-烯酸衍生物在-78 °C的二甘醇中反应,然后在室温下用偏碘酸钠在水性 MeOH 中氧化,随后在回流甲苯中进行消去反应,得到 4-(2-氰基苯基)-2-丁烯酸衍生物,总产率中等至一般。在 0 °C 的 DMF 中使用 NaH 对这些产物进行分子内环化,几乎定量地得到了 1-氨基-2-萘甲酸衍生物。在不分离氨基萘甲酸酯的情况下,用异氰酸酯在回流条件下连续处理,可得到苯并[h]喹唑啉-2,4(1H,3H)-二酮,收率为中等至良好。