Sodium Iodide → HCID 19025818, compound

Temperature

0 °C

Part A. A mineral oil suspension of sodium hydride (0.91 g, 50%, 37.8 mmol) was washed with hexane and dried under vacuum, then suspended in dimethylsulfoxide (20 mL). The mixture was cooled to 0° C., and a solution of 2-methyl-1H-benzimidazole (5.00 g, 37.8 mmol) was added dropwise with stirring. The mixture was stirred for 5 hours with warming to ambient temperature, then was treated dropwise with a solution of chloroethyl ether (8.90 mL, 75.6 mmol). Sodium iodide (2.83 g, 18.9 mmol) was added, and the mixture was heated to 90° C. for 18 hours. After being cooled to ambient temperature, the reaction mixture was poured into 400 mL ethyl acetate, and washed with water (3×400 mL). The aqueous phases were back-extracted in sequence with ethyl acetate (400 mL). The organic phases were combined, dried over anhydrous magnesium sulfate, filtered and evaporated. The residual oil was separated by flash chromatography to afford the product, 1-[ 2-(2-chloroethoxy)ethyl]-2-methyl-1H-benzimidazole, as a white solid, m.p. 96°-98° C. 1H NMR (CDCl3): 7.74-7.64 (1H, m); 7.31-7.20 (3H, m); 4.31 (2H, t, J=5.4 Hz); 3.81 (2H, t, J=5.4 Hz); 3.59 (2H, t, J=5.1 Hz); 3.51 (2H, t, J=5.1 Hz); 2.64 (3H, s).

1. washwas washed with hexane
2. customdried under vacuum
3. stirringThe mixture was stirred for 5 hours
4. temperaturewith warming to ambient temperature
5. temperaturethe mixture was heated to 90° C. for 18 hours
6. temperatureAfter being cooled to ambient temperature
7. washwashed with water (3×400 mL)
8. extractionThe aqueous phases were back-extracted in sequence with ethyl acetate (400 mL)
9. dry with materialdried over anhydrous magnesium sulfate
10. filtrationfiltered
11. customevaporated
12. customThe residual oil was separated by flash chromatography

ORD record

ord-d5e10a267ecb4dc68d5e6c876af961c9

Source dataset

uspto-grants-1994_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05310748