Boron tribromide → 4-Fluoro-3-(hydroxymethyl)phenol

2-Fluoro-5-hydroxybenzyl alcohol was prepared according to the following procedure: 2-Fluoro-5-hydroxybenzaldehyde: to a stirred solution of 2-fluoro-5-methoxybenzaldehyde (18.3 g) in dichloromethane (200 mL) at 0° C. was added dropwise a solution of boron tribromide in dichloromethane (1M, 120 mL, 1 eq.). The mixture was stirred for 3 h then concentrated to a volume of ˜50 mL and partitioned between ethyl acetate (500 mL) and water (500 mL). The organic layer was washed (water), dried (magnesium sulfate) and concentrated to give a red oil (22.7 g). The oil was purified by column chromatography (SiO2, DCM→DIPE) to give the product as a pink crystalline solid (9.9 g, 59% yield);

1. concentrationthen concentrated to a volume of ˜50 mL
2. custompartitioned between ethyl acetate (500 mL) and water (500 mL)
3. washThe organic layer was washed (water)
4. dry with materialdried (magnesium sulfate)
5. concentrationconcentrated

ORD-Eintrag

ord-dc884d24ad0149bc9a26ea2ecdad2a09

Quelldatensatz

uspto-grants-2006_04

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07022707B2