reaction as the key step. The triene precursor bearing a substituted diene and a vinylketone as dienophile was synthesized and then tested in the thermal intramolecular cyclization. We have devised a new strategy to assemble the E,Z-diene through the stereoselective aldol reaction of an ester enolate followed by a stereoselective dehydration. Following the thermal cyclization, the corresponding hydrindanone
使用分子内Diels-Alder反应作为关键步骤,实现了植物毒素coronatin的天然成分-coronafacic酸的立体选择性合成。合成了带有取代的二烯和
乙烯基酮的亲二烯体的
三烯前体,然后在分子内热环化中进行了测试。我们设计了一种新的策略,通过酯烯醇酸酯的立体选择性羟醛反应然后进行立体选择性脱
水来组装E,Z-二烯。在热环化之后,由此获得的具有所需相对立体
化学的相应的氢
茚酮可以容易地转化为
天然产物。通过六个步骤完成了冠糖酸的合成,总收率为29%。