1-(Bromomethyl)-4-chlorobenzene → 5-[1-(4-Chlorobenzyl)-5-methyl-1H-pyrazol-3-yl]-3-[4-(trifluoromethoxy)phenyl]-1,2,4-oxadiazole

Participants

Reaction Steps

To a mechanically stirred solution of 5-(5-methyl-1H-pyrazol-3-yl)-3-[4-(trifluoromethoxy)-phenyl]-1,2,4-oxadiazole (Intermediate C, 60 mg, 0.193 mmol) and 1-(bromomethyl)-4-chlorobenzene (53 mg, 0.215 mmol) in dry THF (2 mL) was added potassium tert-butoxide (24 mg, 0.213 mmol) at a temperature of 0° C. The cooling bath was removed, and the reaction mixture was stirred at rt over night. After the addition of DMF (1 mL), the complete reaction mixture was subjected to preparative HPLC affording the title compound in pure form (68 mg, 81%): 1H NMR (400 MHz, CDCl3) 8.25 (d, 2H), 7.33 (d, 2H), 7.31 (d, 2H), 7.11 (d, 2H), 6.82 (s, 1H), 5.42 (s, 2H), 2.27 (s, 3H); ES-MS m/z 435, HPLC RT (Method K) 1.63 min.

Provenance & Evidence