[CH2:1]([O:3][C:4](=[O:24])[C:5]([O:8][C:9]1[C:18]2[C:13](=[CH:14][CH:15]=[CH:16][CH:17]=2)[CH:12]=[C:11]([O:19]C(OC)=O)[CH:10]=1)([CH3:7])[CH3:6])[CH3:2].[O-]CC.[Na+].CC(O)=O>CCO>[CH2:1]([O:3][C:4](=[O:24])[C:5]([O:8][C:9]1[C:18]2[C:13](=[CH:14][CH:15]=[CH:16][CH:17]=2)[CH:12]=[C:11]([OH:19])[CH:10]=1)([CH3:7])[CH3:6])[CH3:2]1.35 g (4.1 mmol) of 2-(3-methoxycarbonyloxy-naphthalen-1-yloxy)-2-methyl-propionic acid ethyl ester was dissolved in 30 ml of EtOH and cooled down to 5° C.; while stirring, 1.66 ml=1.45 g (4.5 mmol) of a solution of sodium ethoxide (21% in EtOH) was added and the reaction mixture then warmed up to ambient temperature. After 1 hour, it was poured into crashed ice/MeCl2, the pH was adjusted to 5-6 with AcOH (1N) and the reaction mixture was subsequently extracted twice with MeCl2; the organic phases were washed with water, dried (MgSO4) and evaporated. The crude product was purified by flash chromatography (SiO2, gradient of MeCl2/MeOH) to finally give 0.95 g of the title compound as light brown oil.
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