Unprecedented Elimination Reactions of Cyclic Aldols: A New Biosynthetic Pathway toward the Taiwaniaquinoid Skeleton
作者:Juan J. Guardia、Antonio Fernández、José Justicia、Houda Zentar、Ramón Alvarez-Manzaneda、Enrique Alvarez-Manzaneda、Rachid Chahboun
DOI:10.3390/molecules28041524
日期:——
The acid treatment of 6,7-seco-abietane dialdehydes gives, in high yield, the corresponding derivatives with the 4a-methyltetrahydrofluorene skeleton of taiwaniaquinoids. A mechanism involving the elimination of formic acid from the cyclic aldol intermediate is proposed here. This process can be postulated as a new biogenetic pathway from abietane diterpenes to taiwaniaquinoids. Using this novel reaction
6,7-seco-abietane 二醛的酸处理以高收率得到具有 taiwaniaquinoids 的 4a-甲基四氢芴骨架的相应衍生物。这里提出了一种涉及从环状羟醛中间体中消除甲酸的机制。这个过程可以假设为从松香二萜到台湾醌的新的生物遗传途径。利用这一新反应,首次获得了具有生物活性的天然铜酚和紫杉醇的对映体特异性合成。