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. Author manuscript; available in PMC: 2009 Jun 1.
Published in final edited form as: Bioorg Med Chem. 2008 May 6;16(11):6242–6251. doi: 10.1016/j.bmc.2008.04.030

Scheme 1.

Scheme 1

(a) 1,2-dibromoethane, K2CO3, acetone, reflux; (b) Br2, CH2Cl2, Fe; (c) B-bromo-9-BBN, CH2Cl2, reflux 14 days; (d) 1,3-dribromopropane, K2CO3, acetone, reflux; (e) n-butyllithium, THF, 0 °C.