Synthesis of New, Unnatural Macrocyclic Trichothecenes: 3-isoverrucarin A ((1?-O)(3?4)abeo-verrucarin A), verrucinol, and verrucene. 46th Communication on verrucarins and roridins
作者:Nicolas Jeker、Christoph Tamm
DOI:10.1002/hlca.19880710808
日期:1988.12.14
A new unnatural macrocyclic trichothecene, an analogue of verrucarine A (1), which was named 3-Isoverrucarin A ((1″-O)(34)abeo-verrucarin A; 3) was synthesized starting from anguidine (5). The two key reactions were the removal of the 4β-acetoxy group of anguidine (5) by a Barton deoxygenation and the final macrolactonization. During the cyclization procedure, two unexpected new macrocyclic by-products
一种新的非天然大环单端孢,verrucarine A的(模拟1),将其命名为3- Isoverrucarin A((1“ - ö)(34)的abeo- -verrucarin A; 3)合成从anguidine(起始5)。这两个关键反应是通过Barton脱氧和最终的大内酯化作用去除了胍基(5)的4β-乙酰氧基。在环化过程中,形成了两种出乎意料的新的大环副产物,分别称为Verrucinol(19)和Verrucene(20)。它们代表新类型的大环毛孢菌烯,即Verrucene的大分子部分(20)仅由(Z,E)-粘康酸残基组成。Verrucene(20)的类似大环内酯26的形成是不可能的,可能是因为环应变太强了。