Enantioselective Total Synthesis and X-ray Structures of the Tetrahydroprotoberberine Alkaloids (−)-(<i>S</i>)-Tetrahydropalmatrubine and (−)-(<i>S</i>)-Corytenchine
作者:Ahmed L. Zein、Louise N. Dawe、Paris E. Georghiou
DOI:10.1021/np1001169
日期:2010.8.27
Enantioselective total syntheses and X-ray structures of both (S)-tetrahydropalmatrubine (2) and (S)-corytenchine (3) are reported for the first time. They were both derived from (S)-N-norlaudanidine, a benzyltetrahydroisoquinoline that was synthesized with high (>95% ee) enantioselectivity using a chiral auxiliary-assisted Bischler-Napieralski cyclization/reduction approach.
Enantioselective syntheses and X-ray structures of (S)- and (R)-N-norlaudanidine: trace opium constituents
作者:Ahmed L. Zein、Otman O. Dakhil、Louise N. Dawe、Paris E. Georghiou
DOI:10.1016/j.tetlet.2009.10.114
日期:2010.1
The enantioselective synthesis of each of the enantiomers of N-norlaudanidine, a minor Papaver somniferum opium benzyltetrahydoisoquinoline alkaloid is described. This was achieved using a chiral auxiliary-mediated Bischler–Napieralski cyclization-sodium borohydride reduction strategy. The X-ray crystal structures of each of these secondary amines are reported.