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. Author manuscript; available in PMC: 2010 Apr 29.
Published in final edited form as: J Am Chem Soc. 2009 Apr 29;131(16):5792–5799. doi: 10.1021/ja809554x

Scheme 2. Assembly of the Trisaccharide Core.a.

Scheme 2

aReagents and Conditions: (a) 1, MeOTf, DTBP, DCM, MS 4 Å, 0 °C; 55–72% (7:1 β:α); (b) TBAF, AcOH, THF; 98%; (c) 3, Sn(OTf)2 (4 × 0.25 equiv), DTBP, THF, MS 4 Å, −35 °C; 65–75% (8:1 α:β).