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Trost’s Iterative Approach to Trans-Fused Polycyclic Ethers. BnBr=benzyl bromide, Cp=η5-cyclopentadienyl, DBU=1,8-diazabicyclo[5.4.0]undec-7-ene, DMDO=dimethyl dioxirane, DMF=N,N-dimethylformamide, PCC=pyridinium chlorochromate, THF=tetrahydrofuran, TsOH=p-toluenesulfonic acid.
