Stereoselective synthesis of optically active cyclic α- and β-amino esters through lipase-catalyzed transesterification or interesterification processes
A series of cyclic α- and β-amino esters belonging to a family of indolines and quinolines have been efficiently synthesized to study their behavior in lipase-mediated kinetic resolution reactions. The influence of the fused ring structure to the benzene ring and the position of the ester functionality relative to the amino group have been demonstrated, finding excellent values of enantiodiscrimination
Biomimetic asymmetric reduction of 2-functionalized quinolines has been successfully developed with the chiral and regenerable NAD(P)H model CYNAM in the presence of transfer catalyst simple achiral phosphoric acids, providing the chiral 2-functionalized tetrahydroquinolines with up to 99% ee. Using this methodology as a key step, a chiral and potent opioid analgesic containing a 1,2,3,4-tetrahydroquinoline