To a solution of 4 (3.09 mmol, 1.5 g) in 60 mL mixture of MeOH/THF (2:1 v/v), 10% Pd/C (167 mg) was added and hydrogenated under H2 (40 psi) for 24 h. Next, it was filtered, and the solvent was evaporated under reduced pressure to give 1.49 g, (99+%) as a white crystalline solid.
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