Scheme 1 Synthetic route of the compound 1 Reagents and conditions:aTsCl,pyridine,CH 2 Cl 2 ,r.t.,12 h; b4-Iodophenol,K 2 CO 3 ,CH 3 CN,refluxing,24 h; cTrimethylsilylacetylene,CuI,PdPPh 3 4 ,toluene,NEt 3 ,refluxing,48 h; d10%KOH,CH 3 OH,THF,refluxing,2 h; eCuI,PdPPh 3 4 ,THF,NEt 3 ,refluxing,48 h |