C([O:8][C:9]1[CH:10]=[CH:11][C:12]([C:16]2[CH2:25][CH2:24][C:19]3([O:23][CH2:22][CH2:21][O:20]3)[CH2:18][CH:17]=2)=[C:13]([OH:15])[CH:14]=1)C1C=CC=CC=1.O1CCCC1.C(O)C>ClCCl.[Pd]>[O:20]1[C:19]2([CH2:24][CH2:25][CH:16]([C:12]3[CH:11]=[CH:10][C:9]([OH:8])=[CH:14][C:13]=3[OH:15])[CH2:17][CH2:18]2)[O:23][CH2:22][CH2:21]1A flask equipped with magnetic stirrer was charged with 5-(benzyloxy)-2-(1,4-dioxaspiro[4.5]dec-7-en-8-yl)phenol (14.5 g, 42.8 mmol) and tetrahydrofuran (50 ml) and ethanol (100 ml) and palladium (4.54 g, 10% on activated carbon) were added sequentially. The reaction vessel was then evacuated, placed under a hydrogen atmosphere and stirred vigorously for 24 hr. The reaction mixture was filtered through a celite plug, washing with ethyl acetate. The filtrate was concentrated in vacuo to give an off white solid. The crude solid was slurried in dichloromethane (200 ml), affording the title compound (10.2 g, 95%) as a white solid. m/z(ES+) 251(M+H+).
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