3,5-Dichlorobenzamide → Methyl Acetylamino(3,5-dichlorobenzoylamino)acetate

関与物質

反応手順

A mixture of 3,5-dichlorobenzamide (19.0 g) and methyl glyoxylate (8.8 g) in ethyl acetate (300 ml) was heated under reflux for 8 hours. The solvent was removed and the residual adduct was crystallised from chloroform-light petroleum. A portion (4.0 g) of the adduct was dissolved in a mixture of glacial acetic acid (30 ml) and acetonitrile (10 ml) with stirring, and then concentrated sulphuric acid (4 ml) was added. The mixture was kept at room temperature overnight when water (100 ml) was added. The precipitated solid was washed with water, dried, and crystallised from ethanol to give the product (2.45 g) as a colourless crystalline solid, m.p. 235°-237°.

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