The introduction of sulfur units into a variety of symmetrical and unsymmetrical diketopiperazines (DKPs) is described. We investigated different thiolation methods utilizing several bases and electrophilic sulfur reagents, leading to monomethylthio-, bis(methylthio)-, and epithio-DKPs. Their formation proceeded diastereoselectively, facilitating the application in total syntheses of many thiodiketopiperazine (TDKP) natural products. Furthermore, possible side reactions as well as mechanistic studies and stereochemical structural assignments of the obtained products are given.
本文介绍了将
硫单元引入各种对称和不对称二
酮哌嗪(DKPs)的方法。我们利用几种碱和亲电
硫试剂研究了不同的
硫代方法,从而得到了单甲
硫基、双(甲
硫基)和表
硫基 DKPs。它们的形成是非对映选择性的,有利于应用于许多
硫代二
酮哌嗪(TDKP)
天然产物的全合成。此外,还给出了可能的副反应以及所获产物的机理研究和立体
化学结构分配。