Scheme 2a.
aReagents and conditions: (a) R’CH2Br, Cs2CO3, DMF. (b) R”X, Cs2CO3, DMF. (c) H2O2/AcOH. (d) m-chloroperoxybenzoic acid, CH2Cl2. (e) KOtBu, N-fluorobenzenesulfonimide, THF. (f) LiN(SiMe3)2, N-fluorobenzenesulfonimide, THF.
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