an ADCM has been checked. As a demonstration of this annulation, a total synthesis of each of the natural lignan lactones, justicidin E 19 and taiwanin C 20, has also been performed. Since these 4-arylnaphthalenes are expected to exhibit biological activity, the anti-platelet activating factor (anti-PAF) activity of justicidin E has been assayed.
两种芳基(宝石)的酸处理-二卤代环丙基)
甲醇(ADCM)1和3可以很好的收率和优异的选择性得到α-和β-卤代
萘。这些替代的环空反应涉及两种不同类型的高度区域选择性酸诱导的
环丙烷环裂解,其中优先形成更稳定的阳离子中间体决定了选择性。已经检查了制备方法和ADCM非对映异构体之间环合的立体
化学模式。为了证明这种环化反应,还对每种天然
木脂素内酯,justicidin E 19和taiwanin C 20进行了全合成。由于预期这些4-芳基
萘表现出
生物活性,因此已经测定了正义肽E的抗血小板活化因子(抗PAF)活性。