反应详情

温度

-55 °C

4.4 ml (11.0 mmol, 2.5M in hexane) of BuLi solution were added dropwise at −10° C. to a solution of 1.54 ml (11.0 mmol) of diisopropylamine in THF (10 ml). Stirring was then carried out for a further 30 min at −10° C. This solution was added dropwise at −75° C. to a solution of 685 mg (5.0 mmol) of 2-methyl-nicotinic acid in THF (2 ml). Stirring was then carried out for 30 min at −75° C. and for 60 min at 0° C., followed by cooling to −55° C. At that temperature, 1.62 g (7.5 mmol) of 1-(3-bromopropyl)-4-fluorobenzene were added and the reaction solution was stirred for 1 h at −55° C. After warming to RT and stirring for a further 16 h at RT, water (30 ml) and conc. hydrochloric acid (3 ml) were added. Extraction with EA (2×30 ml) was then carried out. The combined organic phases were dried over MgSO4, filtered and concentrated in vacuo. The residue was purified by means of CC (EA), yielding 1.28 g (4.7 mmol, 93%) of 2-(4-(4-fluorophenyl)butyl)-nicotinic acid.

1. stirringStirring
2. waitwas then carried out for 30 min at −75° C. and for 60 min at 0° C.
3. stirringthe reaction solution was stirred for 1 h at −55° C
4. temperatureAfter warming to RT
5. stirringstirring for a further 16 h at RT
6. extractionExtraction with EA (2×30 ml)
7. dry with materialThe combined organic phases were dried over MgSO4
8. filtrationfiltered
9. concentrationconcentrated in vacuo
10. customThe residue was purified by means of CC (EA)