Synthesis of C-17-Functionalized Spongiane Diterpenes: Diastereoselective Synthesis of (−)-Spongian-16-oxo-17-al, (−)-Acetyldendrillol-1, and (−)-Aplyroseol-14
作者:Manuel Arnó、Miguel A. González、Ramón J. Zaragozá
DOI:10.1021/jo026536f
日期:2003.2.1
The diastereoselective synthesis of spongiane diterpenes (-)-spongian-16-oxo-17-al 2, (-)-acetyldendrillol-1 15, and (-)-aplyroseol-14 16 has been completed efficiently via the common intermediate 14. Compound 14 was prepared in five synthetic steps from (+)-podocarp-8(14)-en-13-one 13, easily available from commercial (-)-abietic acid. The key steps in the syntheses were a regioselective reduction
海绵双萜(-)-海绵-16-oxo-17-al 2,(-)-乙酰基登基醇-1 15和(-)-aplyroseol-14 16的非对映选择性合成已通过常见的中间体14有效完成。由五个合成步骤由(+)-罗汉松-8(14)-en-13-一13制备14,可容易地从商业(-)-松香酸获得。合成的关键步骤是1,4-二醛单元的区域选择性还原,一锅缩醛化-乙酰化和反式内酯化。15和16的合成使我们对C-17上的天然(-)-乙酰基树枝钻1的构型进行了修订,并对aplyroseol-14进行了结构上的重新分配。因此,aplyroseol-14 16为海绵型双萜类化合物提供了前所未有的基于δ-内酯的结构。