The tandem acylation-heterocyclization of ketene dithioacetals was performed via soft enolization in MgBr2·OEt2/NEt3 system. A series of 3,6-substituted 2-methylthio-4-pyrones were obtained with a wide functional group tolerance. The reaction showed a good scalability, and the isolation of the products was performed by crystallization without the use of chromatography. Some transformations of the obtained
在MgBr 2 ·OEt 2 /NEt 3体系中通过软烯醇化进行
乙烯酮二
硫缩醛的串联酰化-杂环化反应。获得了一系列具有广泛官能团耐受性的3,6-取代2-甲
硫基-4-
吡喃酮。该反应表现出良好的可扩展性,产物的分离通过结晶进行,无需使用色谱法。所获得的2-甲
硫基-4-
吡喃酮的一些转化,包括用N-亲核试剂取代SMe基团,已被证明可用于制备官能化4-
吡喃酮作为几种
生物活性分子的类似物。