[Cl:1][C:2]1[CH:18]=[CH:17][C:5]([O:6][C:7]2[CH:12]=[CH:11][C:10]([OH:13])=[C:9]([CH2:14][CH:15]=[CH2:16])[CH:8]=2)=[CH:4][CH:3]=1>C(OCC)(=O)C.[Pd]>[Cl:1][C:2]1[CH:18]=[CH:17][C:5]([O:6][C:7]2[CH:12]=[CH:11][C:10]([OH:13])=[C:9]([CH2:14][CH2:15][CH3:16])[CH:8]=2)=[CH:4][CH:3]=1A mixture of the product from step 4 (15.7 g, 60 mmol) and 10% Pd/C (3.1 g) in ethyl acetate (300 mL) was stirred under hydrogen (1 atm). After the reaction was completed (ca. 30 min), the mixture was filtered through celite and the filtrate was concentrated to give 15.7 g of the title compound as an oil which solidified upon standing.
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