Chlorosulfonic acid → 2-Methoxy-5-(2-oxopropyl)benzenesulfonyl chloride

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Reaction Steps

The (3-aminosulfonyl-4-methoxy)phenylacetone (4) is a novel compound and it may be prepared in analogy to a process described in U.S. Pat. No. 544,958 for related compounds. The starting compound is 4-methoxyphenyl acetone which is chlorosulfonated by chlorosulfonic acid at 0-5° C. After treating the reaction mixture with water, the resulting 3-chlorosulfonyl-4-methoxyphenylacetone (9) is formed in solid state and is isolated by filtration. The compound (9) is then treated in ethyl acetate solution with aqueous ammonia at 5° C. The formed crystals of crude (4) are recovered by filtration. The crude (4) may be purified by crystallization, e.g. from ethanol.

Provenance & Evidence