The conformation of ring A of the 3α-hydroxy-2β-piperidino steroid 9, derived from fusidic acid, has been investigated by 1H NMR and is determined by the polarity of the medium: it is primarily in a twist-boat conformation in a non-polar solvent and a chair conformation in a polar solvent.
3α-羟基-2β-
哌啶基类
固醇9的A环结构由
夫西地酸衍生而来,通过1H NMR对其进行了研究,并根据介质的极性进行了确定:在非极性溶剂中,该环主要呈扭曲船形结构,而在极性溶剂中则呈椅子形结构。