反应详情

A mixture of 5-iodo-4-methyl-2-(trifluoromethyl)pyridine (39.1 mg, 0.136 mmol), N-bromosuccinimide (29.1 mg, 0.163 mmol), and benzoyl peroxide (3.3 mg, 0.0136 mmol) in CCl4 (1 mL) was heated at reflux under N2 overnight. Water was added and the mixture was extracted with CH2Cl2 (3×20 mL). The combined extracts were dried (MgSO4) and concentrated in vacuo to give the crude product. This was purified by flash chromatography (Si, 12×160 mm, 1-5% EtOAc in hexanes gradient) to afford 4-(bromomethyl)-5-iodo-2-(trifluoromethyl)pyridine. Rf=0.41 (10% EtOAc/hexanes). 1H NMR (600 MHz, CDCl3): δ 9.03 (s, 1H); 7.76 (s, 1H); 4.51 (s, 3H).

1. temperaturewas heated
2. temperatureat reflux under N2 overnight
3. extractionthe mixture was extracted with CH2Cl2 (3×20 mL)
4. dry with materialThe combined extracts were dried (MgSO4)
5. concentrationconcentrated in vacuo
6. customto give the crude product
7. customThis was purified by flash chromatography (Si, 12×160 mm, 1-5% EtOAc in hexanes gradient)