4-Fluorobenzonitrile → HCID 178513323, compound

Participants

Reaction Steps

In another embodiment, intermediate compounds I-(3-(4-fluorophenyl)-1,2,4-oxadiazol-5-yl)ethanol and 1-(3-(4-fluorophenyl)-1,2,4-oxadiazol-5-yl)ethanone may be prepared as described in Scheme 10D. In this route, 4-fluoro-benzonitrile is reacted with hydroxylamine hydrochloride to provide 4-fluoro-N-hydroxybenz-imidamide. In one embodiment, the reaction is performed at refluxing temperatures. In another embodiment, the reaction is performed in the presence of a lower alkyl alcohol such as ethanol, and a base such as sodium hydroxide or potassium hydroxide. The resultant compound is then reacted with 2-hydroxy-propionic acid to provide 1-(3-(4-fluorophenyl)-1,2,4-oxadiazol-5-yl)ethanol. In one embodiment, the reaction is performed in the presence of DMSO, DCC, and HOBt. 1-(3-(4-Fluorophenyl)-1,2,4-oxadiazol-5-yl)ethanol is then oxidized to 1-(3-(4-fluorophenyl)-1,2,4-oxadiazol-5-yl)ethanone. In one embodiment, the oxidation is performed using manganese dioxide in dioxane.

Provenance & Evidence