Efficient and Convenient Protocol for the Synthesis of Novel 1,2,4-Triazolo[3,4-b][1,3,4]Thiadiazines
作者:Naser Foroughifar、Akbar Mobinikhaledi、Sattar Ebrahimi
DOI:10.1080/00397910903261387
日期:2010.7.27
The novel triazolothiadiazine analogs 5a–p were obtained via a multistep synthetic sequence beginning with 5-substituted 4-amino-1,2,4-triazole-3-thiols 1. Compound 1, in reaction with various aromatic aldehydes 2 in acetic acid, afforded Schiff bases 3a–p. Cyclization of 3a–p with ethyl chloroacetate 4 in the presence of sodium hydride at room temperature gave triazolothiadiazines 5a–p in good yields
新型三唑噻二嗪类似物 5a-p 是通过多步合成序列获得的,从 5-取代的 4-氨基-1,2,4-三唑-3-硫醇 1 开始。化合物 1,在乙酸中与各种芳香醛 2 反应,提供希夫碱 3a–p。在室温下,在氢化钠存在下,3a-p 与氯乙酸乙酯 4 环化得到三唑噻二嗪 5a-p,收率良好。