Like all examined sulfanilamides, this drug is effective in treating infections caused by streptococci, gonococci, pneumococci, staphylococci, and also colon bacillus. Synonyms of this drug are dosulfin, polagin, romezin, and others.

Sulfamethazine: Sulfamethazine, N1-(4,6-dimethyl-2-pyrimidinyl)sulfanilamide (33.1.13), is also synthesized in the aforementioned manner by reacting 4-acetylaminobenzenesulfonyl chloride with 2-amino-4,6-dimethylpyrimidine, which is in turn synthesized by condensing acetylacetone with guanidine followed by hydrolysis of the acetylamino group using a base

This drug is used for pneumococcal, staphylococcal, and streptococcal infections as well as for sepsis, gonorrhea, and other infectious diseases. Synonyms of this drug are sulfadi-amezin and sulfadimidin.

Sulfamethizole: Sulfamethizole, N:-(5-methyl-1,3,4-thiadiazole-2-yl)sulfanilamide (33.1.15), is synthesized in two ways. According to the first, 5-amino-2-methyl-1,3,4-thiadiazole is reacted with 4-nitrobenzenesulfonyl chloride to make a nitro derivative (33.1.14), which is then reduced using iron filings in acetic acid to give the desired sul-famethizole.

The second method of making sulfamethizole consists of reacting 4-acetylaminobenzene-sulfonyl chloride with thiosemicarbazone of acetaldehyde, and subsequent oxidative cyclization of the product (33.1.16) to the substituted 1,3,4-thiadiazole in the presence of potassium ferricyanide in base, along with the simultaneous removal of the protective acetyl group [16,17].

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