Trimethylsilylacetylene → 5-(2-chloro-6-fluorophenyl)-2-{4-[(trimethylsilyl)ethynyl]phenyl}-2,4-dihydro-3H-1,2,4-triazol-3-one

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Reaction Steps

To a solution of 5-(2-chloro-6-fluorophenyl)-2-(4-iodophenyl)-2,4-dihydro-3H-1,2,4-triazol-3-one (0.200 g, 0.483 mmol) in DMSO (2 mL) was added ethynyl(trimethyl)silane (0.071 g, 0.724 mmol), copper iodide (0.005 g, 0.007 mmol), bis(triphenylphosphine) palladium(II) chloride (0.200 g, mmol) and TEA (2.0 mL). The reaction mass was stirred at RT for 24 h. The reaction mass was quenched in water and neutralized with dilute acetic acid and extracted with DCM. The organic layer was dried over anhydrous sodium sulphate and concentrated to afford 0.200 g of the desired product. 1H NMR (300 MHz, DMSO d6): δ 2.31 (s, 9H), 7.44-7.47 (m, 3H), 7.54-7.71 (m, 3H), 7.94-8.01 (m, 1H), 77.95 (br s, 1H). MS (m/z): 384.29 (M−H)−.

Provenance & Evidence