Phosphorus tribromide → HCID 15291211, compound

Participants

Reaction Steps

To a solution of 4-(N-acetyl-N-methylamino)benzyl alcohol (543.0 mg, 3.0 mmol), prepared as in step 2, dissolved in dry CH2Cl2 (11.5 mL) was added dropwise 1M PBr3 in CH2Cl2 (3.6 mL, 3.6 mmol) at 0° C. The reaction was stirred at ambient temperature until TLC indicated complete reaction (~5 hours). The resulting solution was partitioned between ethyl acetate and brine. The combined organic layers were decolorized with charcoal, dried (MgSO4), filtered through celite and concentrated in vacuo. Purification by flash chromatography on silica gel (40% ethyl acetate/hexane) provided 4-(N-acetyl-N-methylamino)benzyl bromide as a colorless solid (595 mg, 81.0%). 1H NMR (300 MHz, CDCl3) δ7.46 (2H, d, J=8.5 Hz), 7.18 (2H, d, J=8.5 Hz), 4.50 (2H, s), 3.27 (3H, s), 1.88 (3H, br s). MS m/e 242 (M+H)+, 259/261 (M+NH4)+. Analysis calc'd for C10H12NOBr: C, 49.61; H, 5.00; N, 5.79. Found: C, 49.35; H, 4.97; N, 5.65.

Provenance & Evidence