Trichloroacetonitrile → Methyl 2-fluoro-4-{5-[2'-(trifluoromethyl)biphenyl-4-yl]-1,2,4-oxadiazol-3-yl}benzoate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

In a microwave vial were added 4-(2-trifluoromethylphenyl)benzoic acid (Fluorochem, 53.2 mg; 0.20 mmol; 1 eq.), triphenylphosphine polymer bound (375 mg; 0.60 mmol; 3 eq.) and trichloroacetonitrile (30 μl; 0.30 mmol; 1.50 eq.). Anhydrous THF (2 mL) was added and the reaction vessel was sealed and heated to 100° C. for 5 min in the microwave. After cooling, the reaction vessel was uncapped and without filtering, Intermediate 1 (46.7 mg; 0.22 mmol; 1.10 eq.) in anhydrous THF (2 mL) was added to the solution along with DIEA (69 μl; 0.40 mmol; 2 eq.). The reaction was capped and heated at 150° C. for 15 min. After cooling, the reaction vessel was uncapped again and the resin was filtered, the filtrate passed through an NH2 SPE column (2 g) and washed by additional THF (2×2 mL). Solvents were evaporated, affording the title compound as a brown solid (61.9 mg; 70%). It was used in the next step without further purification. LC/MS (Method A): 443.3 (M+H)+. HPLC (Method A), Rt 5.98 min (Purity: 87.9%).

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