Exploiting the Facile Release of Trifluoroacetate for the α-Methylenation of the Sterically Hindered Carbonyl Groups on (+)-Sclareolide and (−)-Eburnamonine
作者:Mark V. Riofski、Jinu P. John、Mary M. Zheng、Julia Kirshner、David A. Colby
DOI:10.1021/jo102114f
日期:2011.5.20
applied this method to produce semisynthetic derivatives of the natural products (+)-sclareolide and (−)-eburnamonine, in which the carbonylgroup is proximal to bulky functional groups. Mechanistic insight is also provided from a time course of 19F NMR. Biological evaluation of the natural-product-derived enones led to the identification of a derivative of (−)-eburnamonine with significant cytotoxicity
报道了一种用于羰基的α-甲基化的有效方法,并且该转化通过在烯烃形成过程中容易地消除三氟乙酸盐来完成。该方法代表了在空间障碍情况下对现有方案的改进,并且我们已经证明了该方法在一系列酮,内酰胺和内酯中的实用性。此外,我们已经应用此方法生产了天然产物(+)-香紫苏内酯和(-)-金枪鱼碱的半合成衍生物,其中羰基基团靠近庞大的官能团。还提供19分钟的时间过程的机械洞察力1 H NMR。对天然产物衍生的烯酮的生物学评估导致鉴定出在耐药MDA-MB-231乳腺癌细胞中具有显着细胞毒性(LC 50 = 14.12μM)的(-)-氨丁胺衍生物。