反应详情

温度

-40 °C

A solution of LTMP [freshly prepared at 0° C. from tetramethylpiperidine (154 mg, 1.10 mmol), TMEDA (127.8 mg, 1.10 mmol) and n-BuLi (0.688 mL, 1.10 mmol)] in THF (5 mL) was added to a cooled (−40° C.) stirred solution of 2-anilino-7-chloro-6-fluoro-1-phenyl-1,8-naphthyridin-4(1H)-one (100 mg, 0.273 mmol) in THF(10 mL). The reaction was stirred for 1 h and then cooled to −78° C. Methyl trifluoroacetate (350 mg, 2.74 mmol) was added and stirring was continued for 2 h. The reaction was quenched carefully with water (50 mL), warmed to room temperature and extracted with EtOAc. The combined organic extracts were washed with brine, dried over Na2SO4, and concentrated in vacuo. Silica gel flash chromatography of the residue using 3:1 Hex:EtOAc gave 2-anilino-7-chloro-6-fluoro-1-phenyl-5-(trifluoroacetyl)-1,8-naphthyridin-4(1H)-one (71 mg, 56%) as a light yellow solid: LCMS RT: 3.43 min, MH+: 462.3. The anion generated from LTMP deprotonation can be quenched with other electrophiles including carbon dioxide and 4-nitrophenyl acetate.

1. additionwas added to
2. temperaturecooled to −78° C
3. stirringstirring
4. waitwas continued for 2 h
5. customThe reaction was quenched carefully with water (50 mL)
6. temperaturewarmed to room temperature
7. extractionextracted with EtOAc
8. washThe combined organic extracts were washed with brine
9. dry with materialdried over Na2SO4
10. concentrationconcentrated in vacuo