Total Synthesis of Malyngamides K, L, and 5′′-<i>epi</i>-C and Absolute Configuration of Malyngamide L
作者:Jun-Tao Zhang、Xian-Liang Qi、Jie Chen、Bao-Sheng Li、You-Bai Zhou、Xiao-Ping Cao
DOI:10.1021/jo2003852
日期:2011.5.20
product, and the discrepancy in the specific rotation data suggested that the correct structure of malyngamide L should be 3, in which the absolute configuration of the amine part was enantiomeric to that in compound 2. Then the absolute configuration of the stereogenic center at C(3′′) and C(4′′) in malyngamide L was confirmed by synthesis of compound 3.
加速,对映选择性和一般合成途径,可合成一类麦芽酰胺,K(1),L(3)和5''- epi -C(4),带有环己烯酮环或重度氧化的六元环,以及开发出氯乙烯结构基序。的关键步骤是硼酸的Suzuki交叉偶联反应6 - 8与不饱和羧酸的酰胺5a中,b拥有该氯乙烯基碘化物功能为的骨架的结构1 - 4。关键中间体10a,b使用Ogilvie的方法制备了氯乙烯碘化物官能团。合成化合物2的NMR数据与报道的产物完全一致,比旋光数据的差异表明,麦芽酰胺L的正确结构应为3,其中胺部分的绝对构型为对映体与化合物2中的相同。然后,通过化合物3的合成,确定了麦芽酰胺L中C(3'')和C(4'')的立体中心的绝对构型。