反应详情

温度

-25 °C

Under argon 0.66 ml of a 2 M solution of isopropylmagnesium chloride in tetrahydrofuran are added dropwise to a solution of 0.50 g (4-iodo-phenylethynyl)-triisopropyl-silane in 2.2 ml dry tetrahydrofuran chilled to −25° C. The solution is stirred for 30 min at −25° C. and then combined with 0.26 ml of a 1 M solution of CuCN*2 LiCl in tetrahydrofuran (prepared by dissolving CuCN and LiCl in the ratio 1:2). Shortly afterwards, 0.35 g 4-bromo-2-bromomethyl-1-chlorbenzene are added and the reaction mixture is brought up to −5° C. in the cooling bath. After 6 h stirring at −5° C. the solution is heated to ambient temperature and stirred overnight. Then a mixture of saturated ammonium chloride solution and 25% ammonia solution (9:1) is added and the resulting mixture is added to water. The organic phase is separated off and the aqueous phase is extracted with ethyl acetate, the combined organic phases are dried over sodium sulphate, and the solvent is removed. The residue is purified through silica gel (cyclohexane).

1. customprepared
2. customis brought up to −5° C. in the cooling bath
3. stirringAfter 6 h stirring at −5° C. the solution
4. temperatureis heated to ambient temperature
5. stirringstirred overnight
6. additionis added
7. customThe organic phase is separated off
8. extractionthe aqueous phase is extracted with ethyl acetate
9. dry with materialthe combined organic phases are dried over sodium sulphate
10. customthe solvent is removed
11. customThe residue is purified through silica gel (cyclohexane)