Molecular iodine-catalyzed C3-alkylation of 4-hydroxycoumarins with secondary benzyl alcohols

Recent advances in 4-hydroxycoumarin chemistry. Part 1: Synthesis and reactions

“…hydroxycoumarin 1 at the 3-position with propargylic alcohol 49 using (C 6 F 5 ) 3 B(Reddy et al, 2010), Yb(OTf) 3(Chatterjee and Roy, 2012;Huang et al, 2007b), FeCl 3(Maiti et al, 2011), and iodine in nitromethane(Lin et al, 2009) (Scheme 25).…”