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. Author manuscript; available in PMC: 2010 Jul 13.
Published in final edited form as: Phytochemistry. 2006 Jul 31;67(17):1849–1855. doi: 10.1016/j.phytochem.2006.06.020

Scheme 1.

Scheme 1

Reagents and conditions: i) Pd-H2/EtOH, then NaBH4/EtOH; ii) SOCl2, then 1,8-DBU/CH2Cl2, reflux; iii) AD-mix-α, ButOH/H2O (1:1 v/v), MeSO2NH2, 0° C; iv) 3M HCl, MeOH/H2O (3:1 v/v).