C[O:2][C:3]([C:5]1[CH:21]=[CH:20][C:8]2[C:9]([CH2:13][C:14]3[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=3)([CH3:12])[CH2:10][O:11][C:7]=2[CH:6]=1)=[O:4].[OH-].[Na+].C(O)C.Cl>O1CCCC1.O>[CH2:13]([C:9]1([CH3:12])[C:8]2[CH:20]=[CH:21][C:5]([C:3]([OH:4])=[O:2])=[CH:6][C:7]=2[O:11][CH2:10]1)[C:14]1[CH:19]=[CH:18][CH:17]=[CH:16][CH:15]=1A mixture of 3-Benzyl-3-methyl-2,3-dihydro-benzofuran-6-carboxylic acid methyl ester (300 mg, 1.06 mmol) obtained in Example 4(B), sodium hydroxide (260 mg, 6.5 mmol), ethanol (10 ml) and water (1 ml) in tetrahydrofuran (10 ml), is stirred for 12 h at room temperature. The reaction medium is acidified by adding a 1.2 M hydrochloric acid solution and extracted with ethyl acetate. The organic phase is washed with water, dried (Na2SO4), and concentrated in a rotary evaporator. The product is obtained as a white solid (300 mg, 100%). Mp: 165° C.
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