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. Author manuscript; available in PMC: 2008 Dec 8.
Published in final edited form as: J Nat Prod. 2007 Jul 4;70(7):1073–1083. doi: 10.1021/np0680735

Scheme 8.

Scheme 8

a

aReagents and conditions: (a) MeI, K2CO3, DMSO, 23 °C, 3 h, 28%. (b) H2, Pd/C, EtOAc, 23 °C, 2 h, 73%. (c) 3, EDCI, HOBt, NMM, DMF, 23 °C, 11 h, 61%. (d) H2, Pd/C, EtOAc, 23 °C, 2 h, 82%.