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CAS No. : | 65854-91-3 | MDL No. : | MFCD00095895 |
Formula : | C11H14ClNO | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | IZISMXMXCLUHGI-UHFFFAOYSA-N |
M.W : | 211.69 | Pubchem ID : | 182511 |
Synonyms : |
|
Signal Word: | Warning | Class: | N/A |
Precautionary Statements: | P273 | UN#: | N/A |
Hazard Statements: | H302-H412 | Packing Group: | N/A |
GHS Pictogram: |
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* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
57 g (54%) | In tetrahydrofuran; hydrogenchloride; n-butyllithium; hexane; ethyl acetate; | Step B: 1-(2-amino-5-chlorophenyl)-2,2,2-trifluoroethanone To an oven dried, 3L, 3 necked round bottomed flask with an overhead stirrer, argon inlet, and a 500 mL oven dried addition funnel was added <strong>[65854-91-3]N-(4-chlorophenyl)-2,2-dimethylpropanamide</strong> (100 g, 472 mmol) and dry THF (1L). This solution was cooled in an ice bath to 0 C. and the addition funnel was charged with n-butyllithium (387 mL of a 2.5 M solution in hexanes, 968 mmol). The n-butyllithium solution was added dropwise to the amide solution slowly over 1 h, maintaining the temperature below +5 C. The resulting solution was aged at 0 C. for 1 h during which time an orange precipitate formed. To this mixture was added ethyl 1,1,1-trifluoroacetate (115 mL, 968 mmol), dropwise over 1 h. The resulting clear solution was aged an additional 30 min. The reaction was quenched with 5% aqueous HCl. The mixture was diluted with 1L of EtOAc and the layers were separated. The organic phase was washed with brine, dried (MgSO4), filtered and concentrated in vacuo, to give 160 g of a yellow oil. This material was suspended in 1L of 3N aqueous HCl and the solution was heated at reflux for 24 h. The cooled solution was diluted with 1L of EtOAc and the mixture was made basic with concentrated NH4 OH. The layers were separated and the organic phase was washed with brine, dried (MgSO4), filtered, concentrated in vacuo, and chromatographed on 1.5 kg of silica gel using 15 % EtOAc in hexane as eluant. The chromatographed material was recrystallized from boiling hexane to give 57 g (54%) of pure 1-(2-amino-5-chlorophenyl)-2,2,2-trifluoroethanone as bright yellow crystals, mp: 91-92 C. 1H NMR (CDCl3): delta6.46 (br s, 2H), 6.69 (d, 1H, J=9.2 Hz), 7.32 (dd, 1H, J=2.4, 9.2 Hz), 7.70 (d, 1H, J=2.4 Hz). |
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