Dimethylformamide → 5-Fluoro-3-methyl-benzo[b]thiophene-2-carbaldehyde

To a solution of 5-fluoro-3-methyl-benzo[b]thiophene (4.83 g, 29.1 mmol) in THF (50 mL) at −30° C. under N2 was added n-butyllithium (20.0 mL of a 1.6 M solution in hexanes, 32.0 mmol) dropwise. The resulting orange solution was stirred for 1 h and then DMF (3.4 mL, 43.7 mmol) was added in one portion. The solution was warmed slowly to room temperature and stirred overnight. Saturated aqueous NH4Cl was added and the mixture was extracted with ethyl acetate (3×200 mL). The combined organics were washed with water (100 mL) and brine (100 mL), dried over Na2SO4, filtered and concentrated under reduced pressure to give the title compound (5.55 g, 97%) as a yellow solid: 1H NMR (300 MHz, CDCl3) δ 10.32 (s, 1H), 7.80 (dd, J=9.0, 4.8 Hz, 1H), 7.53 (dd, J=9.3, 2.6 Hz, 1H), 7.31-7.24 (m, 1H), 2.76 (s, 3H).

1. stirringstirred overnight
2. extractionthe mixture was extracted with ethyl acetate (3×200 mL)
3. washThe combined organics were washed with water (100 mL) and brine (100 mL)
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure

ORD record

ord-50f53108dbbd4ab3b02370c109b5fc6f

Source dataset

uspto-grants-2011_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07879872B2