2β-methyl-19-norsteroids are described. By means of optical rotatory dispersion and NMR spectroscopy it is shown that the introduction of 2β-methyl and 2β-acetoxy substituents into 19-nortestosterones changes the normal half chair conformational of A ring to a twist form as cited in the cholestane series.
描述了2β-甲基-19-降糖甾体的合成。通过旋光色散和NMR光谱法表明,将2β-甲基和2β-乙酰氧基取代基引入19-去
甲睾酮中可以将胆甾烷系列中所引用的A环的正常半椅构象改变为扭曲形式。