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. Author manuscript; available in PMC: 2010 Apr 19.
Published in final edited form as: Chem Rev. 2008 May 20;108(6):1982–2014. doi: 10.1021/cr078198u

Scheme 1.a.

Scheme 1.a

a Reagents and conditions: (a) CH2N2 (excess), EtOH, 48 h; (b) KMnO4, H2O, 0 °C, 48 h; (c) Ac2O, py, 48 h, rt; (d) Ba(OH)2, MeOH, reflux; (e) acetone, HC(OEt)3, TsOH, reflux, 15 h; (f) conc. HCl; (g) H2, Pd/CaCO3, EtOH, 3 h.