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. Author manuscript; available in PMC: 2011 May 27.
Published in final edited form as: Carbohydr Res. 2010 Mar 21;345(8):999–1007. doi: 10.1016/j.carres.2010.03.025

Scheme 4.

Scheme 4

(a) TMSOTf, 4 Å MS, DCM, rt, 73% for 27 and 69% for 28; (b) (i) 5% Pd/C, H2, DCM–MeOH (1:10, v/v), rt; (ii) NaOMe, MeOH, rt. 89% over two steps; (c)(i) 5% Pd/C, H2, DCM–MeOH (1:10, v/v), rt, 87%; (ii) H2NCH2CH2NH2, 50 °C, 75%.