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. Author manuscript; available in PMC: 2012 Dec 15.
Published in final edited form as: Bioorg Med Chem Lett. 2011 Oct 13;21(24):7426–7430. doi: 10.1016/j.bmcl.2011.10.011

Scheme 5.

Scheme 5

Reagents and conditions: (a) MsCl, Et3N, CH2Cl2; (b) N-Et mesitylenesulfonamide, NaH, DMF; (c) HBr, PhOH, HOAc, CH2Cl2; K2CO3 (aq); HCl (aq); (d) KSAc, DMF.