Novel method for the synthesis of α- and β-halogenonaphthalenes by regioselective benzannulation of aryl(gem-dihalogenocyclopropyl)methanols: application to the total synthesis of the lignan lactones, justicidin E and taiwanin C<sup>1</sup>
作者:Yoo Tanabe、Shinzo Seko、Yoshinori Nishii、Taichi Yoshida、Naoka Utsumi、Gohfu Suzukamo
DOI:10.1039/p19960002157
日期:——
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。