Acetic Anhydride → 6-Bromo-2-iodopyridin-3-yl acetate

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Reaction Steps

6-bromo-2-iodopyridin-3-ol (150 mg, 0.500 mmol) was added to acetic anhydride (2.4 mL, 25 mmol) at 130° C. It was allowed to stir for 30 min then concentrated and chased with toluene to give the expected product 6-bromo-2-iodopyridin-3-yl acetate (171 mg, 0.500 mmol, 100% yield) by NMR. 1H NMR (400 MHz, DMSO-d6) δ ppm. 7.74 (1H, d, J=8.28 Hz), 7.62 (1H, d, J=8.28 Hz), 2.36 (3H, s). LC-MS retention time: 1.66 min; m/z (MH+): 342, 344. LC data was recorded on a Shimadzu LC-10AS liquid chromatograph equipped with a Waters SunFire 5u C18 4.6×50 mm column using a SPD-10AV UV-Vis detector at a detector wave length of 220 nM. The elution conditions employed a flow rate of 5 ml/min, a gradient of 100% solvent A/0% solvent B to 0% solvent A/100% solvent B, a gradient time of 3 min, a hold time of 1 min, and an analysis time of 4 min where solvent A was 10% acetonitrile/90% H2O/0.1% trifluoroacetic acid and solvent B was 10% H2O/90% acetonitrile/0.1% trifluoroacetic acid. MS data was determined using a Micromass Platform for LC in electrospray mode.

Provenance & Evidence