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. Author manuscript; available in PMC: 2011 Sep 21.
Published in final edited form as: Bioorg Med Chem Lett. 2008 Sep 11;18(20):5443–5447. doi: 10.1016/j.bmcl.2008.09.032

Scheme 2.

Scheme 2

Reagents: (a) H2, Pd/C, rt, 92%; (b) R1SO2Cl (7a–k) or R1NCO (8a–r), DCM, PS-DIEA, 70–90%. All compounds purified by mass-directed HPLC to analytical purity (>98%).