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. Author manuscript; available in PMC: 2009 May 15.
Published in final edited form as: Bioorg Med Chem Lett. 2008 Jan 8;18(10):3047–3051. doi: 10.1016/j.bmcl.2008.01.003

Scheme 4.

Scheme 4

Reagents and conditions: (a) N2CHCO2Et, 3 mol% CuSO4, C6H6 reflux ; (b) NaOH, EtOH (87% after 2 steps); (c) diphenylphosphoryl azide, Et3N, t-BuOH; (d) 1M HCl, MeOH (52% overall)