4-Fluorobenzophenone → 1-(4-Fluorophenyl)-2-(1-methyl-1H-tetrazol-5-yl)-1-phenylethanol

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A solution of 1,5-dimethyltetrazole (29.25 g; 0.298 mole) in dry THF (400 mL) was cooled to -78° C. and treated with n-butyllithium (133 mL of a 2.5M solution in hexane; 0.3325 mole) over 30 minutes. The mixture was stirred at -78° C. for 30 minutes and treated with 4-fluorobenzophenone (50 g, 0.25 mole. The mixture was stirred at -78° C. for 30 minutes and allowed to warm up to 23° C. over 2 hours. The reaction was quenched with 2N HCl (100 mL) and the organic solvent was removed by evaporation. The residue was extracted with CHCl3 (2×100 mL) and the combined organic layers were dried (Na2SO4) and evaporated to afford a brown oil. Purification by chromatography using 20% EtOAc-hexane as eluent afforded the title compound as a white solid (46.3 g; 62%). m.p.=113°-114° C. (crystallized from EtOAc-hexane). MS (CI): m/e=299 for (M+H)+ ;

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