反应详情

A solution of n-butyllithium in n-hexane (1.6M solution, 0.25 mL, 0.40 mmol) was added dropwise to a solution of 2-bromo-7-(1-ethylpropyl)-1-methyl-1H-benzimidazole (100 mg, 0.36 mmol) in diethyl ether (4 mL) at 0° C. To the reaction mixture was added a solution of mesitaldehyde (74 mg, 0.50 mmol) in diethyl ether (1 mL) at 0° C. The reaction mixture was stirred for 0.5 hr, and the reaction was quenched by the addition of 1N hydrochloric acid to the mixture, and the mixture was extracted with ethyl acetate. The organics were dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. The residue was purified by preparative HPLC eluting with a 10-100% water/acetonitrile gradient mixture containing 0.1% trifluoroacetic acid. The fractions containing the title compound were concentrated in vacuo, and the residue was diluted with ethyl acetate and washed with saturated aqueous sodium hydrogen carbonate solution. The organics were dried over anhydrous magnesium sulfate, filtered, and concentrated in vacuo. The resulting solid was recrystallized from ethanol/water to give the title compound (20 mg, 0.057 mmol, 16%) as colorless crystals.

1. customthe reaction was quenched by the addition of 1N hydrochloric acid to the mixture
2. extractionthe mixture was extracted with ethyl acetate
3. dry with materialThe organics were dried over anhydrous magnesium sulfate
4. filtrationfiltered
5. concentrationconcentrated in vacuo
6. customThe residue was purified by preparative HPLC
7. washeluting with a 10-100% water/acetonitrile gradient mixture
8. additioncontaining 0.1% trifluoroacetic acid
9. additionThe fractions containing the title compound
10. concentrationwere concentrated in vacuo
11. additionthe residue was diluted with ethyl acetate
12. washwashed with saturated aqueous sodium hydrogen carbonate solution
13. dry with materialThe organics were dried over anhydrous magnesium sulfate
14. filtrationfiltered
15. concentrationconcentrated in vacuo
16. customThe resulting solid was recrystallized from ethanol/water