Microwave-Assisted Dehydrosulfurization: An Efficient, Solvent-Free Synthesis of 5-(1-Adamantyl)-2-arylamino-1,2,4-triazolo[3,4-b][1,3,4]thiadiazoles
作者:Ali A. El-Emam、Ebtehal S. Al-Abdullah、Ihsan A. Shehata、Omar A. Al-Deeb
DOI:10.3987/com-06-10906
日期:——
A fast and efficient microwave-assisted synthesis of 2-arylamino-5-(1-adamantyl)-1,2,4-triazolo[3,4-b][1,3,4]thiadiazoles is described. The reaction of 3-(l-adamantyl)-5-mercapto-l,2,4-triazole (2) with arylisothiocyanates in DMF at room temperature yielded the corresponding N,N'-disubstituted thioureas (3a-e) in high yields. Compounds (3a-e) were desulfurized via microwave irradiation for 5 min to
描述了一种快速高效的微波辅助合成 2-arylamino-5-(1-adamantyl)-1,2,4-triazolo[3,4-b][1,3,4]thiadiazoles。3-(l-金刚烷基)-5-巯基-l,2,4-三唑 (2) 与芳基异硫氰酸酯在 DMF 中在室温下以高产率反应生成相应的 N,N'-二取代硫脲 (3a-e) . 化合物(3a-e)通过微波辐射脱硫5分钟,得到相应的5-(l-金刚烷基)-2-芳氨基-1,2,4-三唑并[3,4-b][1,3,4 ]噻二唑(4a-e)。化合物(4a-e)也通过微波辐射(2)和相应的芳基异硫氰酸酯的混合物8分钟以高产率制备。尝试通过微波辐射制备脂肪族类似物 (6a-e) 未成功,通过在 DMF 中将化合物 (2) 与相应的脂肪族异硫氰酸酯长时间加热,它们的收率很低。化合物(6a-e)通过(2)与溴化氰反应产生2-氨基类似物(7),其随后与相应的脂肪族卤化物反应以良好的产率独立获得。