反应详情

Commercially available 2-aminobenzenesulfonamide can be treated with N-iodosuccinimide (NIS) to afford 2-amino-5-iodo-benzenesulfonamide. Acylation with a malonyl halide monoester, such as ethyl 3-chloro-3-oxo-propionate, or with a dialkyl malonate, such as diethyl malonate, affords the corresponding amide, which can simultaneously be cyclized to the thiadiazine-dioxide and hydrolyzed to the desired acid intermediate (or a salt thereof, e.g., sodium salt).