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Conditions: (a) (MeO)2TrCl, Py, Et3N, rt, 80%; (b) Ac2O, Py, rt, 94%; (c) HCl, MeOH, CH2Cl2, 0°C, 90%; (d) i) 2-Chloro-4H-1,3,2-benzodioxaphosphorin-4-one, Py, dioxane, rt; ii) tributylammonium pyrophosphate, n-Bu3N, DMF, rt; iii) I2, H2O, Py, rt; (e) i) DBU, CH3CN, rt; ii) H2O, NH4OH, rt, 10% (over two steps).
