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 dynamickineticresolution (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 bifunctionalorganocatalysts I do not form H-bonded self-aggregates in either