Quasiracemic Synthesis: Concepts and Implementation with a Fluorous Tagging Strategy to Make Both Enantiomers of Pyridovericin and Mappicine
作者:Qisheng Zhang、Alexey Rivkin、Dennis P. Curran
DOI:10.1021/ja025606x
日期:2002.5.1
The concept of quasiracemic synthesis is introduced and illustrated with syntheses of both enantiomers of pyridovericin (whose absolute configuration is assigned as R) and mappicine. Like racemic synthesis, quasiracemic synthesis provides both enantiomers in a single synthetic sequence; however, separation tagging is used to ensure that quasiracemic mixtures can be analyzed, separated, and identified
介绍了准外消旋合成的概念,并通过吡啶多菌素(其绝对构型指定为 R)和麦匹辛的两种对映异构体的合成进行了说明。与外消旋合成一样,准外消旋合成在单一合成序列中提供两种对映异构体;然而,分离标记用于确保准外消旋混合物可以按需分析、分离和识别。不同链长的氟标签用于标记两种对映体起始材料。将所得准对映体混合以制备准外消旋物,然后在合成的连续步骤中将其像真正的外消旋物一样处理。氟色谱法用于将最终的准外消旋物分离或分层为两种组分,然后将其分离以提供(真正的)对映体产品。