Benzonitrile → 2-Aminobenzothiazole-6-carbonitrile

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Two grams of 4-aminobenzonitrile was dissolved in about 40 mL acetic acid and the solution was cooled to about 16° C. About 3.3 g of potassium thiocyanate was added and the flask was equipped with an addition funnel. The addition funnel was charged with about 2.7 g bromine and about 5 mL acetic acid. This dark solution was then added to the benzonitrile solution in a dropwise fashion under good agitation and allowed to stir for about 16 hours. The slurry was then drowned into water and filtered. The presscake was washed well with water, reslurried in dilute aqueous alkali and filtered. Again the presscake was washed well with water. After drying in vacuo, about 2 grams of the title compound was isolated. 1H NMR 6.8 (d, 1H, J=8.7 Hz), 6.9 (br s, 2H), 7.6 (dd, 1H, J=2 Hz, J=8.7 Hz), 8.0 (d, 1H, J=2 Hz), LC/MS 2.34 min, 174 (M−H−), RP-HPLC RT 7.7 minutes.

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