Sulfuric Acid → HCID 15035299, compound

Participants

Reaction Conditions

Reaction Steps

16.9 g of 3-dimethoxymethyl-2-(α-methoxy-3,4-dimethoxybenzyl)thiophene are dissolved in 200 ml of tetrahydrofuran. 37.5 ml of 1.6M n-butyl lithium in hexane are added dropwise thereto at -78° C., and the reaction mixture is warmed up to -30° C. gradually. After the mixture is chilled at -78° C., 4.3 ml of N,N-dimethylformamide are added thereto. The mixture is stirred for 30 minutes. The reaction mixture is warmed up to ambient temperature. The mixture is acidified with diluted sulfuric acid, stirred for one hour and extracted with chloroform. The extract is washed with aqueous sodium bicarbonate solution and water, dried and evaporated under reduced pressure to remove the solvent. The residue is purified by silica gel column chromatography [solvent: hexane-ethyl acetate (2:1)], and the eluate is condensed. 14.6 g of 2-(α-methoxy-3,4-dimethoxybenzyl)thiophen-3,5-dicarbaldehyde are obtained as an oil.

Provenance & Evidence