in a variety of pharmaceutical and agrochemical agents. Herein, we report a highly efficient and practical method using DMF and its derivative for the [4+1] and [5+1] annulation reactions to prepare these heterocycles. This metal free reaction takes advantages of shelf stable DMF as solvent and carbon donor, imidazole chloride as catalyst, the mild reaction condition tolerates a broad substrate range
1,2,4-三唑并[3,4- a ]
吡啶和相关的杂环以及取代的三嗪是在各种药物和农用
化学试剂中普遍发现的支架。在这里,我们报告了一种高效且实用的方法,该方法使用
DMF及其衍
生物进行[4 + 1]和[5 + 1]环化反应,以制备这些杂环。这种无
金属的反应利用了贮存稳定的
DMF作为溶剂和碳供体,使用
咪唑氯化物作为催化剂的优势,温和的反应条件可耐受广泛的底物范围并替代。制备的3-未取代的
1,2,4-三唑并[3,4- a ]
吡啶和衍
生物允许在3-位进一步引入各种官能团。