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. Author manuscript; available in PMC: 2011 Jun 26.
Published in final edited form as: Tetrahedron. 2010 Jun 26;66(26):4784–4795. doi: 10.1016/j.tet.2010.04.006

Scheme 6.

Scheme 6

Synthesis of acid, ester, and amide derivatives. Conditions: a) TfOH, ethylene glycol, 1,2-dichloroethane, 65 °C, 1 h, 100%. b) Cl3CCOCl, 1,2-dichloroethane, 65 °C, 2 h, 74%.