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. Author manuscript; available in PMC: 2013 Oct 7.
Published in final edited form as: Bioorg Med Chem Lett. 2009 Feb 20;19(7):1916–1920. doi: 10.1016/j.bmcl.2009.02.057

Scheme 1.

Scheme 1

Reagents and conditions: (a) MP-B(OAc)3, DCE, rt, 16 h (77–97%); (b) 4 N HCl/dioxane, MeOH (98%); (c) R2COCl, DCM, DIEA, rt (65–95%) or (i) R2COH, PS-DCC, HOBt, DCM, DIEA; (ii) MP-CO32−(58–90%).