Pyridine → Chloro-oxo-acetic acid 2-oxo-3-phenyl-2,3-dihydro-benzofuran-5-yl ester

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Oxalyl chloride (17.5 parts) and pyridine (0.5 parts) were added to a suspension of 5-hydroxy-2-oxo-3-phenyl-2,3-dihydrobenzfuran (22.6 parts) in dichloromethane (200 parts). After six hours reflux, chloro-oxo-acetic acid 2-oxo-3-phenyl-2,3-dihydro-benzofuran-5-yl ester was isolated and phenol (9.9 parts) added and the mixture refluxed for eighteen hours. Removal of the solvent gave the crude product oxalic acid (2-oxo-3-phenyl-2,3-dihydro-benzofuran-5-yl)ester phenyl ester (33.3 parts; 89%). Trituration in methanol and recrystallisation from ethyl acetate gave a pure product. Analysis C,70.4; H,3.7; C22H13O6 requires C,70.8; H,3.5%. M.pt.134° C., 1H and 13Cnmr gave spectra consistent with structure.

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