Scheme 6.
Reactions of aldehyde 14: i. NaBH4, THF, rt, 1 h, 98%.; ii. HI (57%), CHCl3, 30 h, 94%; iii. Bu4NN3, acetone/H2O (4:1), rt, 3 h, 91%; iv. 24, Cu(OAc)2, Na ascorbate, t-BuOH, H2O, rt, 12 h, 81%; v. HCl (6 M), 1,4-dioxane, 70 °C, 48 h, 94%.
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