Novel Synthesis of 2,4-Dihydro-5-amino[1,2,4]triazol-3-ones from 1,3-Disubstituted Thioureas
作者:Weike Su、Can Jin、Chuangwei Liu
DOI:10.1055/s-0028-1087563
日期:2009.3
A facile two-step synthesis of 2,4-dihydro-5-amino-[1,2,4]triazol-3-ones is described. Firstly, 1,3-disubstituted thioureas reacted with bis(trichloromethyl) carbonate (BTC) in the presence of a base such as NaHCO3 to form the intermediate 4-(arylimino)-1,3-thiazetidin-2-ones almost quantitatively. Then the intermediates were treated with hydrazine monohydrate to give 2,4-dihydro-5-amino[1,2,4]triazol-3-ones in high yields. In the case of highly sterically hindered thioureas, carbodiimides were unexpectedly obtained in high yields under the same conditions.
描述了一种简单的两步合成2,4-二氢-5-氨基-[1,2,4]三唑-3-酮的方法。首先,1,3-二取代硫脲在如NaHCO3的碱性环境下与双(三氯甲基)碳酸酯(BTC)反应,几乎定量地形成中间体4-(芳基亚氨基)-1,3-噻唑烷-2-酮。然后,将中间体与单水合肼反应,得到高产率的2,4-二氢-5-氨基[1,2,4]三唑-3-酮。在高度立体位阻的硫脲的情况下,在相同条件下意外地得到高产率的氨基脲。