Potassium Cyanide → 2-Iodo-4-nitrobenzonitrile

Temperature

0 °C

Compound 489A (10.0 g, 37.9 mmol) was dissolved in a mixture of 20 mL 12 N HCl/40 mL water and then cooled to 0° C. To this mixture was slowly added a solution of sodium nitrite (5.23 g, 75.8 mmol) in 10 mL water while maintaining the reaction temperature at 0° C. The reaction was stirred for 1 h at 0° C. and then slowly added to a mechanically stirred solution of freshly prepared cuprous cyanide (3.0 g, 33 mmol, prepared as described in Vogel's Textbook of Practical Organic Chemistry, 5th edition, pg. 429) and potassium cyanide (6.30 g, 96.7 mmol) in water (50 mL) at 50° C. The reaction was stirred for 1 h at 50° C., cooled to 25° C. and extracted with methylene chloride (2×200 mL). The organic portion was dried over sodium sulfate, filtered and concentrated in vacuo. The resulting residue was purified by chromatography on silica gel eluting with 4:1 hexane:ethyl acetate to yield 4.6 g (44%) of compound 489B as an orange solid. HPLC: 98% at 2.647 min (retention time) (YMC S5 ODS column, 4.6×50 mm, eluting with 10–90% aqueous methanol over 4 min containing 0.2% phosphoric acid, 4 mL/min, monitoring at 220 nm). C. 4-Amino-2-iodo-benzonitrile (489C)

1. temperaturewhile maintaining the reaction temperature at 0° C
2. stirringThe reaction was stirred for 1 h at 50° C.
3. temperaturecooled to 25° C.
4. extractionextracted with methylene chloride (2×200 mL)
5. dry with materialThe organic portion was dried over sodium sulfate
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. customThe resulting residue was purified by chromatography on silica gel eluting with 4:1 hexane

ORD record

ord-42537e782e2e4b4e8f2addf5a43c86ac

Source dataset

uspto-grants-2006_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07141578B2