Ethyl Acetate → methyl (2Z)-2-(2-amino-5-fluoro-1,3-thiazol-4-yl)-2-hydroxyiminoacetate

Participants

Reaction Conditions

Reaction Steps

To a solution of methyl 4-chloro-4-fluoro-2-(hydroxyimino)-3-oxobutyrate (7.8 g) in N,N-dimethylacetamide (80 ml) was added thiourea (15 g) under stirring at 30° C. and then the stirring was continued for 12 hours at the same temperature. The resulting solution was powered into a mixture of ethyl acetate (300 ml) and water (400 ml), and adjusted to pH 3.0 with saturated aqueous sodium hydrogencarbonate. The separated organic phase was washed with water (400 ml), and brine (400 ml), and dried with magnesium sulfate and evaporated in vacuo to give methyl 2-(2-amino-5-fluorothiazol-4-yl)-2-(Z)-(hydroxyimino)acetate (2.17 g).

Provenance & Evidence