Methyl iodide → 2-(5-bromo-1H-indol-3-yl)acetonitrile

To an ice cooled suspension of (5-bromo-1H-indol-3-ylmethyl)-dimethyl-amine (11.2 g, 44.1 mmol) in benzene (145 mL) was added iodomethane (8.2 mL, 130 mmol). The reaction mixture was stirred overnight at room temperature and concentrated. The residue was dissolved in THF (210 mL). Trimethylsilyl cyanide (11.7 mL, 87.7 mmol) and tetrabutylammonium fluoride (140 mL, 140 mmol of a 1.0 M solution in THF) were added. After stirring for 2.5 hours, at room temperature, water (12 mL) was added. The mixture was partially concentrated. The residue was partitioned in ethyl acetate and water. The organic phase was washed with water and brine, dried over anhydrous magnesium sulfate and evaporated to dryness. Purification by flash chromatography using 15-35% ethyl acetate in hexane as an eluant afforded (5-bromo-1H-indol-3-yl)-acetonitrile (5.30 g, 51%) as a mauve solid, mp 105-106° C. 1HNMR (300 MHz, DMSO-d6): δ11.35 (s, 1H), 7.8 (d, 1H, J=2.2 Hz), 7.35-7.45 (m, 2H), 7.2-7.3 (m, 1H), and 4.0 ppm (s, 2H).

1. concentrationconcentrated
2. dissolutionThe residue was dissolved in THF (210 mL)
3. stirringAfter stirring for 2.5 hours, at room temperature
4. concentrationThe mixture was partially concentrated
5. customThe residue was partitioned in ethyl acetate
6. washThe organic phase was washed with water and brine
7. dry with materialdried over anhydrous magnesium sulfate
8. customevaporated to dryness
9. customPurification by flash chromatography

ORD record

ord-6853ae90b66845938f48bcdf12284373

Source dataset

uspto-grants-2008_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07368471B2