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. Author manuscript; available in PMC: 2011 Jul 19.
Published in final edited form as: Carbohydr Res. 2010 May 12;345(11):1541–1547. doi: 10.1016/j.carres.2010.05.004

Scheme 3.

Scheme 3

Synthesis of trisaccharide-linked Fmoc-threonine 1.

Reagents and conditions. a. 5, NIS, TfOH, 4Å MS, CH2Cl2, 0 °C, 12 h (11: 51%, 11a: 19%) b. Ac2O, DMAP, Pyridine, 1 h, 47%. C. Zn dust, Ac2O–AcOH–THF, 3 h, 47% d. TFA, CH2Cl2, 2 h, 72%.