反应详情

温度

-100 °C

In a 50 mL three-necked flask, N-(2-fluoroethyl)-N,1-dimethyl-1H-pyrazole-4-carboxamide (500 mg, 2.7 mmol) was combined with THF (10.0 ml) to give a colorless solution. 1,1,4,7,7-Pentamethyldiethylenetriamine (621 μl, 2.97 mmol) was added, and, after cooling down to −100° C., tBuLi (1.6 M in pentane, 2.53 ml, 4.05 mmol) was added dropwise. After stirring 30 min an excess of dry ice was carefully added. After 5 min, the cooling bath was removed and the mixture was allowed to warm up to RT. H2O was added and un-reacted starting material was removed by extraction with CH2Cl2. The aqueous layer was then acidified using 1 N HCl solution, and the acid was extracted using CH2Cl2. After drying over Na2SO4, filtration and concentration in vacuum, the viscous oil was dried in HV to yield 307 mg (50%) of product as a light brown viscous oil. MS: m/z=230.2 [M+H]+.

1. customto give a colorless solution
2. additionwas carefully added
3. customthe cooling bath was removed
4. temperatureto warm up to RT
5. additionH2O was added
6. customun-reacted
7. customwas removed by extraction with CH2Cl2
8. extractionthe acid was extracted
9. dry with materialAfter drying over Na2SO4, filtration and concentration in vacuum
10. customthe viscous oil was dried in HV