Diiodomethane → 2-Iodo-5-(trifluoromethyl)benzonitrile

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To a solution of 2-amino-5-(trifluoromethyl)benzonitrile (15.1 g) and diiodomethane (24 mL) in acetonitrile (150 mL) at 35° C. was added t-butyl nitrite (21 mL) dropwise. The reaction was maintained at approximately 35° C. during the addition. The reaction was aged for 30 min and then heated to 60° C. for 30 minutes. The reaction mixture was cooled, diluted with ether and washed twice with water, twice with aqueous sodium bisulfite, water and then brine. The solution was dried over anhydrous MgSO4, filtered through a silica gel plug and then concentrated giving afford a red oil. The product was purified by silica gel chromatography eluting sequentially with hexanes, 3:1 hexanes/CH2Cl2 and 1:1 hexanes/CH2Cl2 to afford 2-iodo-5-(trifluoromethyl)benzonitrile. 1H NMR (CDCl3, 500 MHz) δ 8.10 (d, J=8.5 Hz, 1H), 7.85 (d, J=1.8 Hz, 1H), 7.52 (dd, J=8.5, 1.8 Hz, 1H).

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