An efficient and direct method is described for the synthesis of 5-arylamino-1 H-tetrazoles (Isomer A) or 1-aryl-5-amino-1 H-tetrazoles (Isomer B) and 5-aryloxytetrazoles from arylcyanamides or cynates with nano CoFe2O4 as a reusable and efficient heterogeneous catalyst. Isomer A was obtained from arylcyanamides carrying electron-withdrawing substituents on the aryl ring, while isomer B was produced with electron-releasing groups. The significant advantages of this methodology are high yields, elimination of dangerous and harmful hydrazoic acid, simple work-up procedure and the recovery and reusability of the catalyst.
以纳米
CoFe2O4 作为可重复使用的高效异相催化剂,描述了一种从芳基
氰化物或犬牙交错化合物合成 5-芳基
氨基-
1H-四唑(异构体 A)或 1-芳基-5-
氨基-
1H-四唑(异构体 B)和 5-芳氧基
四唑的高效直接方法。异构体 A 是由芳基环上带有电子吸收取代基的芳基
氰化物制得的,而异构体 B 则是由电子释放基团制得的。这种方法的显著优点是产率高、无需使用危险和有害的
苯甲酸、操作步骤简单以及催化剂可回收和重复使用。