Self-association free bifunctional thiourea organocatalysts: synthesis of chiral α-amino acids via dynamic kinetic resolution of racemic azlactones
作者:Joong-Suk Oh、Ji-Woong Lee、Tae Hee Ryu、Jae Heon Lee、Choong Eui Song
DOI:10.1039/c1ob06629c
日期:——
Concentration-independent high enantioselectivity in the dynamic kinetic resolution (DKR) of racemic azlactones affording chiral α-aminoesters has been achieved using self-association free thiourea-based dimeric cinchona alkaloid organocatalysts. Detailed experimental studies and single crystal X-ray analysis confirmed that these bifunctional organocatalysts I do not form H-bonded self-aggregates in either
使用无自缔合的方法可实现提供手性α-氨基酯的外消旋a内酯在动力学动力学拆分(DKR)中与浓度无关的高对映选择性 硫脲基二聚体金鸡纳生物碱有机催化剂。详细的实验研究和单晶X射线分析证实,这些双功能有机催化剂I在溶液或固态下均不形成氢键结合的自聚集体。