In the present work, homonuclear coordination complex including Zn (II) and N-hexadecylimidazole ligand was used for the first time as a highly efficient homogeneous neutral organocatalyst for the synthesis of 3,4-dihydro-2H-1,3-benzoxazine monomers. Therefore, N-alkyl or N-aryl substituted, both mono-benzoxazine and bis-benzoxazine, were successfully synthesized (21 examples) via Mannich-type condensation reactions. Effortlessly obtaining the pure product with high yields and the short reaction time makes this method more useful and advantageous than the common existing benzoxazine synthesis methods.

中文翻译：

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基于 N-烷基咪唑的同核配位络合物作为中性有机催化剂，可更快有效地构建 3,4-二氢-2H-1,3-恶嗪支架

在目前的工作中，包括 Zn (II) 和N-十六烷基咪唑配体的同核配位络合物首次用作合成 3,4-二氢-2 H -1,3-苯并恶嗪单体的高效均相中性有机催化剂. 因此，通过曼尼希型缩合反应成功合成了N-烷基或N-芳基取代的单苯并恶嗪和双苯并恶嗪（21 个实例）。毫不费力地以高收率和短反应时间获得纯产物，使该方法比现有的常见苯并恶嗪合成方法更有用和更有利。