[CH2:1]([O:8][C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][C:10]=1[CH2:15][C:16]([O:18][CH3:19])=[O:17])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH:20](OC)=[O:21].[H-].[Na+].O>CN(C=O)C>[OH:21][CH:20]=[C:15]([C:10]1[CH:11]=[CH:12][CH:13]=[CH:14][C:9]=1[O:8][CH2:1][C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1)[C:16]([O:18][CH3:19])=[O:17]Methyl 2-benzyloxyphenylacetate (26.99 g) and methyl formate (126.62 g) in dry DMF (300 ml) were added dropwise to a stirred suspension of sodium hydride (50% disp. in oil, 10.13 g) in DMF (300 ml) at 0° C. After stirring at 0° C. for two hours the mixture was poured into water (1000 ml) and washed with ether (2 x 150 ml). The aqueous layer was acidified to pH4 with 6M hydrochloric acid then extracted with ether (2 x 350 ml). The extracts were dried and concentrated under reduced pressure to afford crude methyl 3-hydroxy-2-[2'-benzyloxyphenyl]propenoate as a yellow oil, infrared maxima (film): 1720, 1660 cm-1.
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