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. Author manuscript; available in PMC: 2012 May 1.
Published in final edited form as: Bioorg Med Chem Lett. 2010 Dec 3;21(9):2711–2714. doi: 10.1016/j.bmcl.2010.11.119

Scheme 1.

Scheme 1

Reagents and conditions: (a) SOCl2, MeOH (99%); cylcobutane carbonyl chloride, DIEA, DCM (96%); (c) LiOH, THF, H2O (95%); (d) EDCI, HOBt, DIEA, dioxane, reflux, 24 h (45–59%).