2-Fluoronicotinic acid → HCID 57721337, compound

Participants

Reaction Steps

A mixture of 2-fluoronicotinic acid (Aldrich, 0.42 g, 2.9 mmol) in thionyl chloride (15 mL) was refluxed for two hours before being concentrated in vacuo to a residue which was used without further purification. The residue was dissolved in anhydrous DCM (5 mL) then added dropwise to a 0° C. solution of 2-(2-(tert-butyldiphenylsilyloxy)ethyl)aniline (1.10 g, 2.9 mmol) and TEA (0.43 mL, 3.1 mmol) in anhydrous DCM (15 mL). The reaction was then stirred at ambient temperature for 16 hours before being quenched with water then stirred for an additional thirty minutes. The layers were separated and the aqueous layer extracted with DCM. The combined organic layers were washed sequentially with water, saturated aqueous NaHCO3, and brine before being dried over anhydrous MgSO4, and then concentrated in vacuo. The resultant residue was purified by silica gel flash chromatography, eluting with 4:1 hexane/EtOAc, to afford the desired compound as a white solid (1.1 g, 72%). 1H NMR (DMSO-d6) δ 9.93 (s, 1H), 8.41 (d, 1H, J=4.4 Hz), 8.22 (t, 1H, J=7.6 Hz), 7.27-7.60 (m, 15H), 3.84 (t, 2H, J=6.7 Hz), 2.98 (t, 2H, J=6.7 Hz), 0.92 (s, 9H); HRMS(ESI+), 499.2217 (M+H)+ calc, 499.2230 (M+H)+ found.

Provenance & Evidence