反应详情

A solution of 1-acetyl-6-bromomethylindole-2-carboxylic acid methyl ester (3.1 g.) in toluene (25 ml.) was added dropwise with stirring to a solution of 1-trimethylsilylimidazole (5.60 g.) in toluene (25 ml.) at 80° C. The mixture was stirred at 80° for 2 hours and then evaporated. Water was added and the mixture was extracted several times with ethyl acetate. The combined extracts were washed with water, dried (Na2SO4) and evaporated to give an oil which was dissolved in a concentrated solution of ammonia in ethanol (40 ml.). The solution was allowed to stand at room temperature for 2.5 hours and then evaporated and the residue was chromatographed on silica gel. Elution with chloroform gave a solid which was crystallized from ethyl acetate to give 6-(1-imidazolylmethyl)indole-2-carboxylic acid methyl ester (1.49 g.), m.p. 204°-205° C.

1. customevaporated
2. additionWater was added
3. extractionthe mixture was extracted several times with ethyl acetate
4. washThe combined extracts were washed with water
5. dry with materialdried (Na2SO4)
6. customevaporated
7. customto give an oil which
8. waitto stand at room temperature for 2.5 hours
9. customevaporated
10. customthe residue was chromatographed on silica gel
11. washElution with chloroform
12. customgave a solid which
13. customwas crystallized from ethyl acetate