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. Author manuscript; available in PMC: 2014 Feb 20.
Published in final edited form as: Tetrahedron Lett. 2013 Feb 20;54(8):861–864. doi: 10.1016/j.tetlet.2012.11.103

Scheme 2.

Scheme 2

i. N3(CH2)3NHBoc, CuSO4, sodium ascorbate, CHCl3, H2O, rt, 16h, 90%; ii. TFA, CH2Cl2, 0°C to rt, 16 h, quant.; iii. 2, DMF, rt, 16 h, 40%; iv. Zn(NO3)2, MeOH, 16 h, quant.