Regio- and Diastereoselective Synthesis of Substituted Triazolo [3,4-b]thiadiazin-6-ols and Triazolo[3,4-b]thiadiazines
作者:Azim Ziyaei Halimehjani、Mahsa Mohammadlou
DOI:10.1055/a-2017-4814
日期:——
for the synthesis of novel 7-aryl-3-alkyl(aryl)-6-methyl-6,7-dihydro-5H-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazin-6-ols has been developed via the reaction of 4-amino-[1,2,4]triazole-3-thiols with nitroepoxides in methanol at room temperature. The products were simply dehydrated in the presence of PTSA in ethanol at 70 °C to afford the corresponding 7-aryl-3-alkyl(aryl)-6-methyl-7H-[1,2,4]triazolo[3,4-b][1
一种高效、无催化剂、区域选择性和非对映选择性方法,用于合成新型 7-aryl-3-alkyl(aryl)-6-methyl-6,7-dihydro-5 H -[1,2,4] triazolo [ 3,4- b ][1,3,4]thiadiazin-6-ols 是通过 4-amino-[1,2,4]triazole-3-thiols 与 nitroepoxides 在室温下在甲醇中反应而开发的。将产物在 PTSA 存在下于 70 °C 乙醇中简单脱水,得到相应的 7-aryl-3-alkyl(aryl)-6-methyl-7 H -[1,2,4]triazolo[ 3,4 ] - b ][1,3,4]噻二嗪,产率为 91–98%。此外,用酸性氯仿处理产物得到相应的 α-((4-amino-5-methyl-4 H -1,2,4-triazol-3-yl)thio)-α-phenylpropan-2-one在定量产率。