Scheme 5.
Reagents and Conditions: (a) 10% w/w Pd/C, ethyl acetate, rt, 1 h, 19%; (b) 10% w/w Pd/C, MeOH, rt, 2 h; and (c) NaBH4, MeOH, 0 °C to rt, 2 h, 31%.
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