Enantioselective divergent total syntheses of fawcettimine-type Lycopodium alkaloids
作者:Chen Zeng、Jingyun Zhao、Gang Zhao
DOI:10.1016/j.tet.2014.11.041
日期:2015.1
Enantioselective divergent total syntheses of (+)-fawcettimine, (+)-fawcettidine, (+)-lycoflexine, (+)-lycoposerramine Q, (−)-Huperzine Q and (+)-N-oxyhuperzine Q have been described from a common precursor. The syntheses feature a vinylogous Rubottom oxidation and several biomimetic transformations.
Divergent Total Syntheses of (−)-Lycopladine D, (+)-Fawcettidine, and (+)-Lycoposerramine Q
作者:Chen Zeng、Changwu Zheng、Jingyun Zhao、Gang Zhao
DOI:10.1021/ol402906y
日期:2013.11.15
Enantioselective total syntheses of (+)-fawcettidine and (+)-lycoposerramine Q as well as the first totalsynthesis of (−)-lycopladine D from a common intermediate have been accomplished by a divergent path. The common intermediate was derived from a Hajos–Parrish-like diketone by a stereoselective Birch reduction and a Suzuki coupling. The synthesis of (−)-lycopladine D featured an allylic oxidation
The totalsyntheses of four fawcettimine‐related Lycopodium alkaloids, (±)‐fawcettimine, (±)‐fawcettidine, (±)‐lycoposerramine‐Q, and (±)‐lycoflexine, were completed in a highlystereoselective manner. The Pauson–Khand reaction of 4‐methylidene‐6‐siloxyoct‐1‐en‐7‐yne followed by regio‐ and stereoselective hydrogenation led to the short‐step preparation of the bicyclo[4.3.0]nonenone intermediate bearing