Iodine → tert-Butyl 4-amino-3-iodobenzylcarbamate

Participants

Reaction Steps

To a mixture of (4-amino-benzyl)-carbamic acid tert-butyl ester (4.8 g, 21.6 mmol) and calcium carbonate (2.7 g, 27 mmol) in methanol (60 mL) was added iodine (5.5 g, 21.6 mmol) in portions. The mixture was heated at reflux overnight and then concentrated in vacuo to give a dark brown residue, which was partitioned between ethyl acetate and saturated sodium bisulfite solution. The organic phase was washed with water and brine, dried over Na2SO4 and filtered. The filtrate was concentrated in vacuo to give a residue, which was purified by chromatography (5%-20% ethyl acetate in hexanes) to give 3.5 g (47%) of the desired product as a brown semi-solid. MS(APCI+): m/z 349.1 (MH+).

Provenance & Evidence