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。
A novel synthesis of α- and β-halonaphthalenes via regioselective ring cleavage of aryl(gem-dihalocyclopropyl)methanols and its application to total synthesis of lignan lactones, justicidin e and taiwanin c
作者:Shinzo Seko、Yoo Tanabe、Gohfu Suzukamo
DOI:10.1016/s0040-4039(00)97197-1
日期:1990.1
two types of aryl(gem-dihalocyclopropyl)methanols (ADCM) gave α- and β-halonaphthalenes in good yields with excellent selectivity. With the new method used as the key step, the two title natural lignanlactones were synthesized in seven steps.