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. Author manuscript; available in PMC: 2011 Jul 1.
Published in final edited form as: Bioorg Med Chem Lett. 2010 May 7;20(13):3946–3949. doi: 10.1016/j.bmcl.2010.05.006

Scheme 4.

Scheme 4

(i) HBTU, DMAP, TEA, DMF glycolic acid, tert-butylester; (ii) Trifluoroacetic acid 98 % over two steps; (iii) HBTU, DMAP, TEA, DMF, choline chloride; 60 %.