Synthetic studies of kampanols, novel p21ras farnesyltransferase inhibitors: an efficient synthesis of the tetracyclic ABCD ring system of kampanols
作者:Katsuhiko Iwasaki、Mari Nakatani、Munenori Inoue、Tadashi Katoh
DOI:10.1016/j.tet.2003.09.037
日期:2003.10
An enantioselective synthesis of the tetracyclic ABCD ring system (4) of kampanols, novel Ras farnesyltransferase inhibitors from a microorganism, was efficiently achieved for the first time starting from the known trans-decalone derivative 9. The synthetic method involves the following two key steps: (i) a conjugate addition reaction between the α-methylene ketone 6 and the Grignard reagent (7) of
对映体的四环ABCD环系统(4)的坎帕醇,从微生物的新型Ras法呢基转移酶抑制剂的对映选择性合成是第一次有效地实现了从已知的反十碳六烯衍生物9。合成方法包括以下两个关键步骤:(i)α-亚甲基酮6与邻二取代溴苯衍生物8的格氏试剂(7)之间的共轭加成反应,以在C9处以立体选择性传递偶联产物21(ii)苯酚衍生物5的苯硒介导的环化反应立体选择性地构建必需的四环中间体25,其具有B / C环的顺式融合的连接性。