Dimethylformamide → 6-Phenoxynicotinaldehyde

Temperature

-78 °C

To a solution of 5-bromo-2-phenoxy-pyridine (3.85 g, 15.4 mmol) described in Manufacturing Example 40-1-1 in tetrahydrofuran (60 mL) was added n-butyl lithium (10.6 mL, 1.60 M hexane solution, 16.9 mmol) under nitrogen atmosphere at −78° C., which was stirred for 35 minutes at −78° C. N,N-Dimethylformamide (1.55 mL, 20.0 mmol) was then added to this reaction solution at −78° C., which was stirred for further 10 minutes at room temperature. After allowing to room temperature, the reaction solution was partitioned into water and ethyl acetate. The organic layer was separated, washed with saturated aqueous sodium chloride, dried over anhydrous magnesium sulfate and filtered. The filtrate was concentrated under a reduced pressure. The residue was purified by NH silica gel column chromatography (heptane:ethyl acetate=5:1) to obtain the title compound (1.12 g, 37%).

1. stirringwhich was stirred for further 10 minutes at room temperature
2. customAfter allowing to room temperature
3. customthe reaction solution was partitioned into water and ethyl acetate
4. customThe organic layer was separated
5. washwashed with saturated aqueous sodium chloride
6. dry with materialdried over anhydrous magnesium sulfate
7. filtrationfiltered
8. concentrationThe filtrate was concentrated under a reduced pressure
9. customThe residue was purified by NH silica gel column chromatography (heptane:ethyl acetate=5:1)

ORD record

ord-31adbd0a38aa451e807c0a48507564f4

Source dataset

uspto-grants-2013_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08507530B2