Acetic Acid → HCID 20145020, compound

Participants

Reaction Steps

To a mixture of ethyl 5-acetyl-2-methylamino-4-thiazolecarboxylate (7.1 g), 30% acetic acid solution of hydrogen bromide (10 ml) and acetic acid (50 ml) was added pyridinium hydrobromide perbromide (9.9 g) at ambient temperature and stirred for 2.5 hours. The reaction mixture was poured into water (300 ml) and the precipitate was collected by filtration. The precipitate was dissolved in a mixture of ethyl acetate and water and the resultant mixture was adjusted to pH 7.0 with 20% aqueous potassium carbonate. The organic extract was washed with brine, dried over magnesium sulfate and evaporated in vacuo. The residue was washed with ethyl ether to give ethyl 5-(2-bromoacetyl)-2-methylamino-4-thiazolecarboxylate (6.6 g). mp 130°-131.5° C.

Provenance & Evidence