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. Author manuscript; available in PMC: 2013 Jun 26.
Published in final edited form as: Bioorg Med Chem Lett. 2008 Jul 31;18(22):5912–5915. doi: 10.1016/j.bmcl.2008.07.110

Scheme 2.

Scheme 2

Reagents and conditions: (i). Pd(PPh3)4, CuI, piperidine, DMF, 0 °C-rt, 50–82%; (ii). H2, 5% Pd-C, methanol, rt, 85–90%; (iii). I2, PPh3, imidazole, 0 °C, CH2Cl2, rt, 80–92%; (iv). PPh3, neat, 110 °C, 80–92%.