[C:1](Cl)(=[O:3])[CH3:2].[OH:5][CH2:6][C:7]1[O:11][C:10]([CH:12]=[O:13])=[CH:9][CH:8]=1.P([O-])(O)(O)=O.[Na+]>C(Cl)Cl.N1C=CC=CC=1>[C:1]([O:5][CH2:6][C:7]1[O:11][C:10]([CH:12]=[O:13])=[CH:9][CH:8]=1)(=[O:3])[CH3:2]10.05 ml of acetyl chloride were added at 5° C. to a solution of 16.2 g of 5-hydroxymethyl-2-furancarboxaldehyde and 200 ml of methylene chloride and 11.4 ml of pyridine and 50 ml of methylene chloride were then added. The reaction mixture was stirred for 3 hours at 20° C. and the reaction mixture was treated with an aqueous sodium dihydrogenphosphate solution and extracted with methylene chloride. The extract was dried and concentrated to obtain 19.35 g of the desired product after chromatography on silica by eluting with a hexane/ethyl acetate (7/3) mixture.
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