作者:Francesco Mingoia、Maxime Vitale、David Madec、Guillaume Prestat、Giovanni Poli
DOI:10.1016/j.tetlet.2007.11.202
日期:2008.1
A formal synthesis of podophyllotoxin was carried out in nine steps. The key pseudo-domino step was accomplished through the succession of an intermolecular palladium-catalyzed allylic alkylation and an intramolecular Mizoroki-Heck coupling reaction. (C) 2007 Elsevier Ltd. All rights reserved.
New Picropodophyllin Analogs via Palladium-Catalyzed Allylic Alkylation−Hiyama Cross-Coupling Sequences
engaged into Hiyama couplings with various iodoarenes, to give the corresponding 4-(α-styryl)-γ-lactones. The use of a specifically substituted iodoarene generated an advanced tetracyclic lactone intermediate incorporating rings A−D of lignans belonging to the podophyllotoxin family. Subsequent electrophilic aromatic substitution with a variety of electron-rich arenes afforded the target picropodophyllin