Cesium carbonate → HCID 67308549, compound

Participants

Reaction Steps

0.43 g of 4-bromo-2-fluorobenzonitrile, 2.2 g of caesium carbonate, 0.12 g of 9,9-dimethyl-4,5-bis(diphenylphosphino)xanthene and 0.04 g of palladium acetate are added successively to a solution of 0.40 g of 9H-carbazole-4-carboxylic acid methyl ester, obtained according to stage 2 of Example 1, in 30 ml of dioxane under an inert argon atmosphere. The reaction mixture is refluxed for 3 hours, and then cooled, filtered and concentrated under reduced pressure. The residue is purified by silica gel chromatography, elution being carried out with a mixture of heptane and ethyl acetate (96/4 by volume), so to give 496 mg of 9-(4-cyano-3-fluorophenyl)-9H-carbazole-4-carboxylic acid methyl ester, the characteristics of which are the following:

Provenance & Evidence