4-Methallyl substituted 1,2,4-triazoline-3-thiones as a source of N-bridgehead heterocycles
作者:Steffen Ernst、Svea Jelonek、Joachim Sieler、Klaus Schulze
DOI:10.1016/0040-4020(95)01038-6
日期:1996.1
4-Methallyl substituted 1,2,4-triazoline-3-thiones 1 upon treatment with sulfuric acid or bromine cyclize to derivatives of thiazolo[2,3-c]-1,2,4-triazole 2 and 3, respectively. However, after methylation of the thiocarbonyl-sulfur by methyl trifluoromethanesulfonate and further treatment with bromine, compounds 1 undergo a cyclization to the imidazo[2,1-c]-1,2,4-triazoline-3-thiones 5.
用硫酸或溴处理后,4-甲基烯丙基取代的1,2,4-三唑啉-3-硫酮1分别环化为噻唑并[2,3-c] -1,2,4-三唑2和3的衍生物。但是,在硫代羰基硫被三氟甲磺酸甲酯甲基化并进一步用溴处理后,化合物1环化成咪唑并[2,1-c] -1,2,4-三唑啉-3-硫酮5。