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. Author manuscript; available in PMC: 2009 Jul 21.

Published in final edited form as: Carbohydr Res. 2008 May 8;343(10-11):1594–1604. doi: 10.1016/j.carres.2008.05.003

Scheme 2 — i) DIPCDI, HOBt, DMF, dichloromethane (CH₂Cl₂), 86%; ii) Thiolacetic acid, AIBN, 84%; iii) Piperidine, CH₂Cl₂; iv) AcS(CH₂)₆COOH (15), DIPCDI, HOBt, DMF, CH₂Cl₂, 86% in two steps; v) TFA, 72%; vi) 2-Amino ethanol, DIPCDI, HOBt, DMF, CH₂Cl₂; vii) Hydrazine hydrate, EtOH; viii) Dithiothreitol, water, 85% in three steps; ix) 17, DIPCDI, HOBt, DMF; x) Hydrazine hydrate, EtOH; xi) 95% TFA, 2.5% 1,2-ethanedithiol.