The preparation of a number of piperazine derivatives bearing amino acid substituents on the nitrogen is described; these compounds undergo oxidation with MCPBA to yield bis(N-oxides) in which both oxygen atoms are axially orientated and hydrogen bonded to the amide NHs, giving highly defined conformations to the molecules; the structure of the valine derivative (8c) was confirmed by X-ray analysis.
描述了多种在氮上具有
氨基酸取代基的
哌嗪衍
生物的制备;这些化合物与MCPBA进行氧化反应,形成双(N-氧化物),其中两个氧原子呈轴向取向并与酰胺NH之间形成氢键,从而为分子赋予高度定义的构象;缬
氨酸衍
生物(8c)的结构通过X射线分析得到了确认。