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. Author manuscript; available in PMC: 2012 Jun 1.
Published in final edited form as: Bioorg Med Chem Lett. 2011 Apr 5;21(11):3420–3422. doi: 10.1016/j.bmcl.2011.03.111

Scheme 2.

Scheme 2

Synthesis of triazole-linked r(UTRA) phosphoramidite. Steps: (a) CuSO4, sodium ascorbate, THF/ethanol/water, 60 °C, 12 h, 79%; (b) iPr2NEt, ClP(OCH2CH2CN)N(iPr)2, CH2Cl2, rt, 6 h, 47 %.