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. Author manuscript; available in PMC: 2013 Jan 1.
Published in final edited form as: Bioorg Med Chem Lett. 2011 Oct 28;22(1):601–605. doi: 10.1016/j.bmcl.2011.10.074

Scheme 2.

Scheme 2

Reagents and conditions: (a) EDC, CH2Cl2, rt, 24 h, 65%; (b) TFA, CH2Cl2, rt, 24 h, 90%; (c) 2,4,6-trimethylbenzoylsulfonyl chloride, Et3N, CH2Cl2, rt, 24 h, 85%.