rac-1-[4-(4-fluoro-phenyl)-1-oxo-2,8-diaza-spiro[4.5]dec-8-yl]-cyclohexanecarbonitrile 生成 (R)-1-[4-(4-fluoro-phenyl)-1-oxo-2,8-diaza-spiro[4.5]dec-8-yl]-cyclohexanecarbonitrile 、 (S)-1-[4-(4-fluoro-phenyl)-1-oxo-2,8-diaza-spiro[4.5]dec-8-yl]-cyclohexanecarbonitrile