Scheme 5.
Reactions of benzyl azide 21; i. 24, Cu(OAc)2, Na ascorbate, t-BuOH, H2O, 20 °C, 16 h, 72%; ii. HCl (6 M), 1,4-dioxane, 80 °C, 48 h, 96%; iii. Ph3P, THF/H2O (10:1), then HCl, rt, 1 h, 74%.
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