反应详情

24.2 g (92.6 mmol) 5-(4-chlorophenyl)-pentyl bromide 60 in 60 ml ethanol was added to a solution of 10.6 g (0.139 mmol) thiourea in 40 ml ethanol. It was heated for 5 h to reflux, allowed to cool, admixed with 50 ml concentrated ammonia solution and again heated for 3 h to reflux. After cooling it was acidified to pH 1 with ca. 30 ml concentrated HCl and extracted twice with 150 ml ether. It was washed with saturated NaCl solution, dried over sodium sulfate and the solvent was removed on a rotary evaporator, 19.0 g (95%) 79 was obtained. A mixture of 5.00 g (16.3 mmol) 79, 2.25 g (16.3 mmol) potassium carbonate, 3.50 g (16.3 mmol) 6 and 50 ml dimethylformamide was stirred for 12 h at room temperature. It was admixed with water and extracted with ether. The ether phase was washed with water, dried over sodium sulfate and concentrated by evaporation. 7.1 g yellow oil which yielded 5.06 g (71%) of the ethyl ester of 27 after flash chromatography (toluene/heptane 1:2).

1. temperatureIt was heated for 5 h
2. temperatureto reflux
3. temperatureto cool
4. temperatureagain heated for 3 h
5. temperatureto reflux
6. temperatureAfter cooling it
7. extractionextracted twice with 150 ml ether
8. washIt was washed with saturated NaCl solution
9. dry with materialdried over sodium sulfate
10. customthe solvent was removed on a rotary evaporator