反应详情

To a solution of 5.3 g (24.1 mmol) 2,6-dichloro-4-methyl-pyridine-3-carboxylic acid methylester in CCl4 (92 ml) were added 3.1 g (26.5 mmol) N-Bromosuccinimide, 395 mg (2.4 mmol) AlBN and 1.45 ml (25.3 mmol) acetic acid. The mixture was irradiated with a 200 W Wolfram lamp at 60° C. for 24 h. Subsequently the mixture was filtered through celite and the filtrate was concentrated in vacuo. Purification of the residue by CC (hexane/EtOAc 97:3) provided 5.2 g of a mixture of 2,6-dichloro-4-methyl-pyridine-3-carboxylic acid methylester and 4-(bromomethyl)-2,6-dichloro-pyridine-3-carboxylic acid methylester which was used in subsequent reactions without further purification.

1. filtrationSubsequently the mixture was filtered through celite
2. concentrationthe filtrate was concentrated in vacuo
3. customPurification of the residue by CC (hexane/EtOAc 97:3)