Water → HCID 178502623, compound

Participants

Reaction Steps

A solution of 11 g (0.0617 mol) of benzofuran-2,3-dione dioxime in 50 ml of dimethylformamide is added dropwise to a suspension of 2.4 g (0.06 mol) of 60% strength sodium hydride in 25 ml of dimethylformamide, and stirring is effected at 20° C. for one hour. 7.55 g (0.06 mol) of dimethyl sulphate are then added dropwise and stirring is continued at 20° C. for a further 16 hours. The reaction mixture is poured into water and the resulting mixture is extracted with ethyl acetate, the organic phase is dried over sodium sulphate and concentrated under reduced pressure. The residue is chromatographed over silica gel using hexane/acetone (7:3). Stirring the residue with diethyl ether affords 0.7 g of benzofuran-2,3-dione 3-(O-methyl-oxime) 2-oxime (VIII-1) as a mixture of stereoisomers consisting of 90.6% of isomer A and 9% of isomer B (HPLC).

Provenance & Evidence