synthesized for the in situ generation of Bis-IBX and catalytic oxidations. The seemingly better solubility of the in situ-generated Bis-IBX and the attenuated reactivity arising from its unique structural features and methoxy substituents allowed the catalytic oxidation of activated alcohols selectively using DIDA/oxone. Chemoselectiveoxidations were demonstrated for substrates containing two different
(-)-Ascochlorin was synthesized using palladium-catalyzed three component couplingreaction. Reaction of the aryl iodide 3, isoprene, and sodium p-toluenesulfinate in the presence of Pd 2 (dba) 3 CHCl 3 catalyst and NaHCO 3 gave the 4-aryl-2-methyl-2-butenylsulfone 5 selectively in 68% yield. The allylic sulfone 5 was converted into the useful intermediate 2 in 5 steps, which was subjected to Julia