that decreases the number of steps and chromatographic purifications, and which also enhances the stereoselective nature of the synthesis. This new route also allows access to the C21 methyl group of the OHC scaffold, and several new analogues with varying stereochemistry at this location were evaluated for their ability to up‐regulate the Hh pathway.
氧
固醇(OHC)是
胆固醇的代谢副产物,已知其可充当刺猬(Hh)信号传导途径的激动剂。以前,我们报道了23(S)-羟基
胆固醇[23(S)-OHC,4 ]是Hh信号的有效激活剂,具有将小鼠胚胎成纤维细胞功能分化为成骨命运的能力。求23(S)-适用于体内评估的OHC,我们开发了一种经过修订的合成路线,该路线减少了步骤和色谱纯化的数量,还增强了合成的立体选择性。该新途径还允许接近OHC支架的C21甲基,并且评估了在该位置具有不同立体
化学的几种新类似物上调Hh途径的能力。