Bromine → Methyl 2-amino-4-methylbenzo[d]thiazole-5-carboxylate

Participants

Reaction Conditions

Reaction Steps

56 g of N-(2-methyl-3-methoxycarbonylphenyl)thiourea (0.25 mol) were dissolved in 2 l of chlorobenzene, and the mixture was cooled to 0° C. 40 g of bromine (0.25 mol) in 100 ml of chlorobenzene were then added dropwise. The reaction mixture was heated at 90° C. for 3 h, and the precipitate was filtered off with suction and washed with methylene chloride. The precipitate was then dissolved in ethyl acetate and extracted with sodium bicarbonate solution. After washing and drying, the product was obtained by stripping off the solvent. Yield: 43 g (80%).

Provenance & Evidence