with two molecules of malononitrile catalyzed by triethylamine at ambient temperature stereoselectively results in the formation of tetracyclic spirooxindoles in 60–90% yields. Thus, a new simple and efficient ‘one-pot’ method to synthesize substituted spirooxindoles was found directly from reasonable starting compounds. Unique stereoselectivety was achieved on two or three centers in this pseudo four-component
发现了一种新型的催化立体选择性级联伪四组分反应。在环境温度下,
三乙胺催化的
靛红,环酮与两个分子的
丙二腈的简单,容易的假四组分反应,立体选择性地形成了60-90%产率的四环螺并氧杂
吲哚。因此,直接从合理的起始化合物中发现了一种新的简单有效的“一锅法”,用于合成取代的螺氧并
吲哚。在该假四组分反应中,在两个或三个中心获得了独特的立体选择性。