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. Author manuscript; available in PMC: 2011 Sep 6.
Published in final edited form as: J Med Chem. 2008 Sep 13;51(19):6044–6054. doi: 10.1021/jm800533c

Scheme 1.

Scheme 1

Synthesis of 7.a

a Reagents: (a) 4, EtOH, reflux; (b) pyridinium tribromide, 33% w.t. in HOAc, room temperature; (c) i. thiourea, EtOH, reflux; ii. pivaloyl chloride, TEA, CH3CN, THF, reflux.