Oxidative Friedel−Crafts Reaction and its Application to the Total Syntheses of <i>Amaryllidaceae</i> Alkaloids
作者:Kimiaka C. Guérard、Cyrille Sabot、Léanne Racicot、Sylvain Canesi
DOI:10.1021/jo802728u
日期:2009.3.6
numerous natural products. As an illustration of the potential of this transformation, total syntheses of compounds belonging to the Amaryllidaceae alkaloids family such as O-methyljoubertiamine, mesembrine, and its natural derivative the dihydro-O-methylsceletenone have been achieved in eight/nine steps. The synthetic route to these molecules features a novel and efficient transformation on the basis
Concise Total Syntheses of (±)-Joubertiamine, (±)-O-Methyljoubertiamine, (±)-3′-Methoxy-4′-O-methyljoubertiamine, (±)-Mesembrane, and (±)-Crinane
作者:Alakesh Bisai、Mrinal Das、Subhadip De
DOI:10.1055/s-0035-1561583
日期:——
Subsequent simple allylic oxidation of Eschenmoser–Claisen products and synthetic elaborations (reductions/oxidations) enabled the totalsyntheses of the title compounds to be completed in good yields in a few steps. The strategic viability was further tested in the totalsyntheses of Amaryllidaceae alkaloids (±)-mesembrane and (±)-crinane. Towards this end, we synthesized advanced intermediate keto-aldehydes