Efficient Large-Scale Synthesis of 9-Alkylfluorenyl Phosphines for Pd-Catalyzed Cross-Coupling Reactions
作者:Christoph A. Fleckenstein、Renat Kadyrov、Herbert Plenio
DOI:10.1021/op7001479
日期:2008.5.1
The reactions of aliphatic alcohols with fluorene coupled with a transfer hydrogenation result in the facile formation of 9-alkylfluorenes, whose deprotonation with nBuLi and quenching of the fluorenyl anion with Cy2PCl in MTBE gave 9-alkylfluorenyl-dicyclohexyl phosphines, which are conveniently isolated as the respective phosphonium tetrafluoroborates after treatment with aqueous HBF4. This route