Synthesis of Biologically Active (-)-Dehydroiso-.BETA.-lapachone and the Determination of Its Absolute Configuration
作者:Tetsutaro Kimachi、Eri Torii、Yusuke Kobayashi、Misae Doe、Motoharu Ju-ichi
DOI:10.1248/cpb.59.753
日期:——
Synthesis of dehydoriso-β-lapachone (1) in both racemic and enantioenriched forms is achieved starting from reduced naphthoquinone equivalents. As for the synthesis of enantioenriched dehydroiso-β-lapachone, introduction of the asymmetric center was carried out by catalytic asymmetric epoxidation of the unfunctionalized trisubstituted olefin using Shi epoxidation diketal catalyst. The construction
从减少的萘醌当量开始合成外消旋和对映体富集形式的脱氢异-β-拉帕酮 (1)。对于对映体富集的脱氢异-β-拉帕酮的合成,不对称中心的引入是通过使用Shi环氧化二缩酮催化剂对未官能化的三取代烯烃进行催化不对称环氧化来进行的。异丙烯基呋喃-1,2-(β)-萘醌的构建是通过环氧萘的酸性开环反应和随后的硝酸铈(IV)二铵(CAN)氧化来进行的。通过比较合成的(R)-脱氢异-β-拉帕酮的测量旋光值,最终确定天然存在的(-)-脱氢异-β-拉帕酮的绝对构型为(R)。