A strategically novel kinetic resolution of β-substituted olefiniccarboxylicacids is developed by asymmetric bromolactonization using an organocatalyst, 4-tBuPh-tris 1b. The cyclization stage, which provides δ-lactone, is proposed to be operative for discrimination of each enantiomer of carboxylicacids.
通过使用有机催化剂4 - t BuPh-tris 1b进行不对称溴分子内酯化,开发出了具有战略意义的新型β-取代烯烃羧酸动力学拆分方法。提出提供δ-内酯的环化阶段可用于区分羧酸的每种对映体。