Highly enantioselective organocatalytic synthesis of piperidines. Formal synthesis of (−)-Paroxetine
摘要:
A highly enantioselective organocatalytic synthesis of piperidines is reported. The reaction is catalyzed by simple and commercially available secondary amines, affording the corresponding adducts with high yields and enantioselectivities. Moreover, this reaction is used for the formal synthesis of (-)-Paroxetine, a blockbuster drug, in only three steps. (C) 2009 Elsevier Ltd. All rights reserved.
The synthesis of piperidines and piperidinesderivatives in enantiopure fashion has been a challenging goal for organic chemists. In this report we developed a nice cascade reaction for piperidinederivatives based in an amidomalonate Michael addition to enals followed by an intramolecular hemiaminal formation with good yields and enantioselectivities. Moreover we studied the ‘in situ’ intramolecular