Butoconazole is a fungostatic drug, and it is formally classified as an imidazole, but only because of the presence of an imidazole ring in the structure. It is believed that butoconazole, like miconazole, econazole, and other "pure" representatives of the imidazole class, also inhibits the biosynthesis of estrosterin in the cytoplasmatic membrane of fungi; however, it is very possible that this is not the only mechanism of its action. It is effective for vaginal infections caused by various types of candida. It is also used only externally and vaginally. Synonyms of this drug are femstat, listomin, and others.
Terconazole: Terconazole, 1-[4-[[2-(2,4-dichlorophenyl)-2-(1H-1,2,4-triazol-1-yl-methyl)-1,3-dioxolan-4-yl]methoxy]phenyl]-4-(1-methylethyl)-piperazine (35.2.19), is chemically very similar to ketoconazole, the only difference being that instead of an imidazole ring it contains a triazole ring and the piperazine ring, instead of an acetyl group is substituted by an isopropyl group. It is synthesized from 2,4-dichloroacetophenone, which is reacted with glycerol in the presence of p-toluenesulfonic acid to make a ketal, 2-(2,4-dichlorophenyl)-2-methyl-4-hydroxymethyl-1,3-dioxolane (35.2.13). Brominating this with molecular bromine at the methyl group and then acylating the free hydroxyl group with benzoyl chloride gives 2-(2,4-dichlorophenyl)-2-bromomethyl-4-benzoyloxymethyl-1,3-dioxolane
(35.2.14). Reacting this with 1,2,4-triazole in the presence of sodium, followed by the hydrolysis of the protecting benzoyl group with sodium hydroxide gives 2-(2,4-dichlorophenyl)-2-(1H-1,2,4-triazol-1-ylmethyl)-4-hydroxymethyl-1,3-dioxolane
(35.2.15). Treating this with methanesulfonyl chloride gives the corresponding mesylate 35.2.16.
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