Herein we report the total syntheses of pseudoceramine A-D (2â5) and spermatinamine (1) isolated from the marine sponge Pseudoceratina sp. Direct acyl substitution of α-hydroxyiminoesters with amine nucleophiles was developed as a key transformation. The synthetic compounds confirm the reported structures and importantly gives access to non-symmetrical spermine based natural products carrying two different bromotyrosine building blocks. Our new synthesis of spermatinamine is two steps shorter and more efficient than the previously reported sequence.
在此,我们报告了从海洋海绵中分离出的假
精胺 A-D(2â5)和
精胺(1)的全合成。合成的化合物证实了所报道的结构,重要的是提供了含有两种不同
溴酪氨酸结构单元的非对称精
胺类天然产物。与之前报道的序列相比,我们的
精胺新合成方法缩短了两个步骤,效率更高。