2-(Bromomethyl)-1,3-difluorobenzene → HCID 68709545, compound

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Reaction Conditions

Reaction Steps

1-Hydroxypyrazole (49.3 mg, 0.59 mmol, 1.0 eq) was mixed with 165.8 mg (0.80 mmol, 1.36 eq) of 2,6-difluorobenzyl bromide in ˜1-2 mL of anhydrous CHCl3 under argon. The mixture was heated at 80° C. for 18 h under inert atmosphere in a sealed flask without condenser. The residue was partitioned between 37 weight percent aqueous HCl and toluene. The aqueous layer was collected and the toluene fraction extracted again with 37 weight percent aqueous HCl. The combined aqueous HCL fractions were neutralized with 5N aqueous NaOH to pH˜11-12 and then back-extracted with 3×30 mL of CHCl3. The organic layers were combined, washed with brine, dried over Na2SO4 and concentrated under reduced pressure to yield 86.3 mg (70.1% yield) of 2-(2,6-difluorobenzyl)-1-hydroxy-1H-pyrazole as a tan brown solid. 1H NMR (CDCl3 300 MHz) δ 7.37 (m, 1H), 7.18 (d, 1H), 6.95 (t, 2H), 6.85 (d, 1H), 6.11 (t, 1H), 5.43 (s, 2.00 H). LC/MS (ES) M+1=211.2

Provenance & Evidence