Both α- and β-C-glycosides can be prepared by SnCl4-mediated addition of titanium enolates from N-acetylthiazolidinethiones to glycals. Subsequent removal of the chiral auxiliary provides enantiomerically pure fragments that are useful for the synthesis of natural products.
通过 SnCl4 介导的 N-acetylthiazolidinethiones 与甘
氨酸的
钛烯醇加成,可以制备 δ- 和 δ²-C 糖苷。随后去除手性助剂可得到对映体纯的片段,这些片段可用于
天然产物的合成。