Development of Enantioselective Synthetic Routes to the Hasubanan and Acutumine Alkaloids
作者:Nicholas A. Calandra、Sandra M. King、Seth B. Herzon
DOI:10.1021/jo401889b
日期:2013.10.18
reduction–aza-Wittig sequence. The latter serves as a universal precursor to the targets. Key carbon–carbon bond constructions include highly diastereoselective acetylide additions to the N-methyliminium ion derived from 39 and Friedel–Crafts and Hosomi–Sakurai cyclizations to construct the carbocyclic skeleton of the targets. Initially, this strategy was applied to the syntheses of (−)-acutumine (4), (−)-dechloroacutumine
Efficient Entry to the Hasubanan Alkaloids: First Enantioselective Total Syntheses of (−)-Hasubanonine, (−)-Runanine, (−)-Delavayine, and (+)-Periglaucine B
作者:Seth B. Herzon、Nicholas A. Calandra、Sandra M. King
DOI:10.1002/anie.201102226
日期:2011.9.12
Maximized divergence: The hasubanan alkaloids given in the scheme have been synthesized in eight or nine steps from the aryl azide 1. The utility of 5‐trimethylsilylcyclopentadiene as an easily removed, stabilizing stereocontrol element has been demonstrated.