1-Hydroxybenzotriazole hydrate → 4-[5-(3-Chloro-4-cyclohexylphenyl)-1,2,4-oxadiazol-3-yl]benzenemethanol

Participants

Reaction Conditions

Reaction Steps

N,N-Dicyclohexylcarbodiimide (0.615 g, 0.003 mol) is added to a solution of 3-chloro-4-cyclohexyl benzoic acid (0.475 g, 0.002 mol), N-hydroxy-4-hydroxymethylbenzamidine (0.45 g, 0.003 mol) and N-hydroxybenzotriazole monohydrate (0.457 g, 0.003 mol) in N,N-dimethylformamide (10 mL). The reaction mixture is stirred at 130-135° C. for 2 hrs. It is then cooled to 0-5° C., filtered and washed with dichloromethane (2×20 mL). The filtrate is evaporated under reduced pressure and the residue is treated with demineralized water (20 mL). It is extracted with ethyl acetate (3×15 mL) and the combined extract is dried over sodium sulfate. Removal of solvent under reduced pressure gives a crude residue which is purified by column chromatography (silica gel 230-400, ethyl acetate:toluene, 15:85) to give {4-[5-(3-chloro-4-cyclohexylphenyl)-[1,2,4]-oxadiazol-3-yl]phenyl}methanol.

Provenance & Evidence