5-Morpholino-1,2,3,4-thiatriazole as a Sulfur-Transfer Reagent in the Reactions with Thioketones
作者:Grzegorz Mlostoń、Marta Woźnicka、Heinz Heimgartner
DOI:10.1002/hlca.200790060
日期:2007.3
decomposition of 5-morpholino-1,2,3,4-thiatriazole (7), which leads to the extrusion of an active form of sulfur, in the presence of different thioketones is described. The interception of the S-atom by the CS bond leads to in situ formation of an elusive thiocarbonyl S-sulfide of type 5. This intermediate is a prone 1,3-dipole, which undergoes effectively [2+3] cycloadditions with thioketones to yield 1
描述了5-吗啉代-1,2,3,4-噻三唑(7)的热分解,这导致在不同的硫酮存在下硫的活性形式的挤出。CS原子对S原子的拦截导致原位形成5型难以捉摸的硫代羰基S硫化物。该中间体是易于产生的1,3-偶极子,其与硫酮有效地进行[2 + 3]环加成反应,从而以区域选择性的方式产生1,2,4-三硫杂环戊烷衍生物。出乎意料的是,3,3-二氯-2,2,4,4-四甲基-3-硫代氧杂环丁酮(1c)不会导致预期的对称1,2,4-三硫杂环戊烷。该结果可以通过降低相应的硫磺5c的稳定性来解释。。在等摩尔量的两种不同的硫酮的存在下进行的三组分反应导致形成8型的“混合” 1,2,4-三硫杂环戊烷。