2-(3-Bromo-4-fluoro-alpha-hydroxybenzyl)-3-methoxymethoxypyridine → 2-(3-Bromo-4-fluorobenzoyl)-3-methoxymethoxypyridine
Reaction equation
[Br:1][C:2]1[CH:3]=[C:4]([CH:17]=[CH:18][C:19]=1[F:20])[CH:5]([C:7]1[C:12]([O:13][CH2:14][O:15][CH3:16])=[CH:11][CH:10]=[CH:9][N:8]=1)[OH:6]>[O-2].[O-2].[Mn+4].C(OCC)(=O)C>[Br:1][C:2]1[CH:3]=[C:4]([CH:17]=[CH:18][C:19]=1[F:20])[C:5]([C:7]1[C:12]([O:13][CH2:14][O:15][CH3:16])=[CH:11][CH:10]=[CH:9][N:8]=1)=[O:6]Participants
4
Procedure
A mixture of 2-(3-bromo-4-fluoro-α-hydroxy-benzyl)-3-methoxymethoxypyridine (14.0 g), activated manganese dioxide (41.8 g) and ethyl acetate (200 mL) was stirred overnight at room temperature, which was then subjected to filtration. The filtrate was concentrated under reduced pressure. The concentrate was purified by means of a silica gel column (ethyl acetate--hexane) to afford 2-(3-bromo-4-fluorobenzoyl)-3-methoxymethoxypyridine (13.0 g) (compound B-5). Physical properties and spectrum data of the product are shown in Table 3 and Table 4.