2-(Benzyloxy)-5-bromobenzaldehyde → (2-(Benzyloxy)-5-bromophenyl)methanol

A mixture of 2-benzyloxy-5-bromobenzaldehyde (14.55 g) and sodium borohydride (2.6 g) in ethanol (250 ml) was stirred under argon for 1 hour. The solvent was evaporated, the residue dissolved in ethyl acetate and added dropwise to 0.1M hydrochloric acid solution (200 ml) at 0° C. The organic solution was washed with saturated aqueous sodium hydrogen carbonate (100 ml) and brine (100 ml), dried (sodium sulphate), filtered and evaporated to give 2-benzyloxy-5-bromobenzyl alcohol (14.85 g) as an oil. To a solution of 2-benzyloxy-5-bromobenzyl alcohol (14.75 g) in diethyl ether (150 ml) was added dropwise, at 0° C., to a solution of phosphorus tribromide (13.68 g) in diethyl ether (40 ml). The mixture was warmed to ambient temperature, diluted with diethyl ether (200 ml) and filtered through a pad of silica gel (200 g) washing with 1 litre of diethyl ether. The combined organic solution was washed with saturated aqueous sodium hydrogen carbonate (150 ml) and brine (150 ml), dried (sodium sulphate), filtered and evaporated to give 2-benzyloxy-5-bromobenzyl bromide (15.2 g).

1. customThe solvent was evaporated
2. dissolutionthe residue dissolved in ethyl acetate
3. additionadded dropwise to 0.1M hydrochloric acid solution (200 ml) at 0° C
4. washThe organic solution was washed with saturated aqueous sodium hydrogen carbonate (100 ml) and brine (100 ml)
5. dry with materialdried (sodium sulphate)
6. filtrationfiltered
7. customevaporated

ORD record

ord-07b92932188c4a8f97586dd4ec9e041d

Source dataset

uspto-grants-1998_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05811459