Synthesis of homochiral α-cyperone via enantioselective catalysis
作者:Claude Agami、Catherine Kadouri-Puchot、Valérie Le Guen
DOI:10.1016/s0957-4166(00)80168-8
日期:1993.4
The title sesquiterpene was obtained in a five-step synthesis starting from an achiral substrate: oxycarvone. Enantioselectivity is due to a phenylalanine-catalyzed intramolecular aldol reaction.
sets of results give information about the mechanism of carbonyl activation by (S)-proline during asymmetricsyntheses: (i) X-ray structures of two ketols produced by the proline-induced cyclization of triketones; (ii) (S)-Proline-catalyzed asymmetric dehydration of (±)-β ketols leading to opticallyactive enones.