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. Author manuscript; available in PMC: 2008 Feb 8.
Published in final edited form as: Bioorg Med Chem. 2006 Jul 7;14(19):6525–6538. doi: 10.1016/j.bmc.2006.06.019

Scheme 3.

Scheme 3

Reagents and conditions: (a) Et3N, THF, reflux, for S-49 from 47. (a′) NaH, THF, 0 °C, for S-50 from 48; (b) i—EtOH, AcCl, 0 °C, ii—CSCl2, aq NaHCO3, CHCl3.