An enantiospecificroutetowardsbioactivemerosesquiterpenes, based on the cationic-resin-promotedFriedel–Craftsalkylation of alkoxyarenes with an α,β-unsaturated ketone, is reported. Reaction of ketone 11 with 3,4-methylenedioxyphenol afforded the corresponding chromene. Treatment of 11 with protected phenol 20 gave aryl nordrimane ketone 21, a suitable intermediate in the synthesis of bioactive
Simple, Chemoselective Hydrogenation with Thermodynamic Stereocontrol
作者:Kotaro Iwasaki、Kanny K. Wan、Alberto Oppedisano、Steven W. M. Crossley、Ryan A. Shenvi
DOI:10.1021/ja412342g
日期:2014.1.29
Few methods permit the hydrogenation of alkenes to a thermodynamically favored configuration when steric effects dictate the alternative trajectory of hydrogen delivery. Dissolving metal reduction achieves this control, but with extremely low functional group tolerance. Here we demonstrate a catalytic hydrogenation of alkenes that affords the thermodynamic alkane products with remarkably broad functional group compatibility and rapid reaction rates at standard temperature and pressure.
Formal Synthesis of Ambrox® and 9-Epiambrox
作者:M. Cortés、V. Armstrong、M. E. Reyes、J. López、E. Madariaga
DOI:10.1080/00397919608003554
日期:1996.5
(-)-Drimenol(2) was used as starting material for the synthesis of diastereoisomeric diols 3 and 4, through the nitrile 7, Compounds 3 and 4 are the direct precursors of Ambrox(R) (1) and 9-epiambrox(2).