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250 mg of 3,4-dihydro-2,2-dimethyl-4-(2-pyridyl)-2H-1-benzopyran were dissolved in 10 ml of nitromethane and cooled in an ice-bath under a nitrogen atmosphere. 280 mg of finely powdered aluminum chloride were added followed, after 5 minutes, by 700 mg of 2-iodobenzoyl chloride. After stirring at 0° C. for 30 minutes and at room temperature for 1 hour the mixture was diluted with diethyl ether and washed with sodium hydroxide solution. The organic phase was dried over sodium sulphate and evaporated. The residue was chromatographed on silica gel using ethyl acetate/petroleum ether (1:2) for the elution to give 230 mg of 3,4-dihydro-2,2-dimethyl-6-(2-iodobenzoyl)-4-(2-pyridyl)-2H-1-benzopyran.

1. temperaturecooled in an ice-bath under a nitrogen atmosphere
2. washwashed with sodium hydroxide solution
3. dry with materialThe organic phase was dried over sodium sulphate
4. customevaporated
5. customThe residue was chromatographed on silica gel
6. washfor the elution