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. Author manuscript; available in PMC: 2014 Sep 4.
Published in final edited form as: J Am Chem Soc. 2013 Aug 22;135(35):10.1021/ja405990z. doi: 10.1021/ja405990z

Scheme 2.

Scheme 2

Synthesis of trisaccharide donor 15.a

aReagents and conditions: (a) Cu(OTf)2, BH3·THF, THF, 0 °C, 96%; (b) DDQ, CH2Cl2, H2O, 89%; (c) TMSOTf, MS AW-300, CH2Cl2, 0 °C, 75%.