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. Author manuscript; available in PMC: 2009 Dec 15.
Published in final edited form as: Bioorg Med Chem. 2008 Nov 1;16(24):10270–10280. doi: 10.1016/j.bmc.2008.10.048

Scheme 3.

Scheme 3

Reagents and conditions: (i) BnPEGBr (n = 0 or 1), K2CO3, CH3CN, 80 °C, 20 h or NaH, DME, 80 °C, 20 h; (ii) H2, Pd/C, EtOH, rt, 18 h (iii) TsCl, Et3N, DMAP, CH2Cl2, 0 °C–rt, 20 h (iv) propargyl alcohol, NaH, THF, 70 °C, 5 h.