反应详情

440 mg of 4-(5-iodo-2-pyridyl)-2,2-dimethyl-2H-1-benzopyran-6-carbonitrile, 386 mg of p-tolyltrimethyltin, 144 mg of lithium chloride and 16 mg of bis(triphenylphosphine)palladium dichloride in 4 ml of dimethylformamide were heated at 100° C. for 2 hours. After cooling to room temperature 10% aqueous ammonia and ethyl acetate were added, the phases were separated and the aqueous phase was back-extracted with ethyl acetate. The combined organic phases were dried over sodium sulphate and evaporated. The residue was chromatographed on silica gel using ethyl acetate/petroleum ether (1:4) for the elution to give 268 mg of 4-[5-(4-methylphenyl)-2-pyridyl]-2,2-dimethyl-2H-1-benzopyran-6-carbonitrile which was used without further purification.

1. additionwere added
2. customthe phases were separated
3. extractionthe aqueous phase was back-extracted with ethyl acetate
4. dry with materialThe combined organic phases were dried over sodium sulphate
5. customevaporated
6. customThe residue was chromatographed on silica gel
7. washfor the elution