我们开发了一种新颖且方便的立体选择路径,用于制备吡咯并-1,5-苯并恶嗪酮(PBO)。这一创新途径设想了使用(-)-薄荷醇作为方便的手性助剂和关键的S N Ar,用于立体选择性地制备叔芳基-烷基醚。作为进一步的进步,我们利用这种新构想的合成路线来制备2取代的PBO类似物,以对其自身进行生物学评估或获得各种其他功能化选择。
The Stereoselective Synthesis of 2-Aryl-2-hydroxybutanoic Acid via Menthyl Chiral Auxiliaries
作者:Ji-Ming Xiang、Bao-Lin Li
DOI:10.1002/hlca.201000024
日期:2010.10
In the presence of titanium(IV) tetraethoxide ((EtO)4Ti), menthyl arylglyoxylates are prepared by transesterification of ethyl arylglyoxylates and natural (−)‐(1R,2S,5R)‐menthol. Using menthyl as a chiral auxiliary, the corresponding novel (R)‐menthyl 2‐aryl‐2‐hydroxybutanoates are synthesized by the addition of Et2Zn with menthyl arylglyoxylates. The structures of the products are characterized by