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. Author manuscript; available in PMC: 2009 Aug 1.
Published in final edited form as: Bioorg Med Chem. 2008 Jun 20;16(15):7291–7301. doi: 10.1016/j.bmc.2008.06.030

Scheme 4a.

Scheme 4a

a Reagents: (i) (a) n-BuLi, -78 °C, THF; (b) B(OMe)3; (ii) t-BuOH, NaOH, (t-BuOCO)2O; (iii) Cu(OAc)2, NEt3, Mol sieves (4Å), rt; (iv) TFA, CH2Cl2; (v) 4-Chloro-4′-fluorobutyrophenone, KI, K2CO3, DME.