Scheme 10.
Reaction conditions: (a) Ph-Me, 110 °C, 24 h, (95% yield); (b) NH3 aq., 1,4 dioxane, reflux, 48 h, (43% yield); (c) Dowex 500WX8, MeOH/H2O, 50 °C, 12 h, (72% yield).
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