Benzo-condensed 1,3-oxathiin-2-ones 4, 8, 11, 14 were prepared according to the reaction sequences shown in the Schemes 1 and 3. Due to the facile thermal extrusion of CO2 these compounds proved to be very useful synthetic thiete equivalents for the preparation of heterocyclic ring systems containing sulfur. Some examples of hetero Diels-Alder reactions are compiled in the Schemes 2 and 4.
根据方案1和方案3所示的反应序列,制备了苯并缩合的1,3-噁三嗪-2-酮4、8、11、14。由于
二氧化碳的易热脱离,这些化合物被证明是非常有用的
硫含杂环环体系合成的
硫代等效物。方案2和方案4中汇编了一些杂环Diels-Alder反应的例子。