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. Author manuscript; available in PMC: 2011 May 9.
Published in final edited form as: Bioorg Med Chem Lett. 2009 Nov 13;20(1):60–64. doi: 10.1016/j.bmcl.2009.11.031

Scheme 3.

Scheme 3

Reagents and condition: (a) (i) BSA, CH3CN, 78 °C, 30 min, then TMSOTf, 75 °C, 18 h, 43%, (ii) TBAF, THF, rt, 4 h; (b) (i) anomer separation on silica gel, 43%, (ii) NH3/CH3OH, 110 °C, 18 h, 71%.