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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):1605–1611. doi: 10.1016/j.carres.2008.05.002

Scheme 2.

Scheme 2

(i) Ph2SO, DTBMP, CH2Cl2, −70 °C, Tf2O then 6, 83%; (ii) a) CH3CO2H–H2O, 80 °C, 1 h; b) Ac2O, Py, DMAP, 92%; (iii) CH3COSH, Py, 16 h, 67%; (iv) a) TFA, H2O, 1 h; b) CH3ONa, CH3OH, pH < 10, 86%.