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The obtained N-protected compound (485 mg, 1 mmol) was hydrogenated (3 atm) by 10
mol % Pd/C (30 mg) in dry methanol (30 mL) for 5 h. After that the reaction mixture was
filtered on Celite to remove the Pd/C, and then evaporated to dryness to give a crude product, which was purified by column chromatography (silica gel), eluting with
EtOAc/Hexane (4:1) solvent mixture, to give the pure catalyst 6 (Yield: 89%).ÕâÊÇL-¸¬°±õ£°·-Cbz Íѱ£»¤²½Ö裬ÎÒ×ö¹ý
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