Tetrabutylammonium Fluoride → 5-(2-chloro-6-fluorophenyl)-2-(4-ethynylphenyl)-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-[(trimethylsilyl)ethynyl]phenyl}-2,4-dihydro-3H-1,2,4-triazol-3-one (0.200 g, 0.570 mmol) in DCM was added TBAF (0.362 g, 1.11 mmol). The reaction mass was stirred at RT for 2-3 h. The reaction mass was quenched in water and filtered through celite bed and concentrated. The obtained crude product was purified with column chromatography on silica gel eluting with 2.0% MeOH:DCM to afford 0.400 g of the desired product. 1H NMR (300 MHz, DMSO d6): δ 4.21 (s, 1H), 7.50 (t, J=9.3 Hz, 1H), 7.58 (d, J=8.4 Hz, 3H), 7.67-7.71 (m, 1H), 7.96 (d, J=8.1 Hz, 2H), 12.69 (br s, 1H).

Provenance & Evidence