反应详情

To a solution of N-[4-cyano-3-(trifluoromethyl)phenyl]-N-(2,2-dimethylpropyl)glycine (1.13 g, 3.58 mmol) in CH2Cl2 (10 mL) at 0° C. was added oxalyl chloride (0.33 mL, 3.76 mmol), followed by DMF (0.01 mL, 0.2 mmol). The resulting solution was stirred 5 min in the cooling bath, 20 min at rt and 1 h at reflux under N2. After cooling to rt, the solution was slowly poured into NH4OH (10 mL of a 30 wt % solution) at 0° C., stirred 30 min, and the layers were separated. The aqueous layer was extracted with CH2Cl2 (×2), combined organics were washed (water, brine), dried over Na2SO4, filtered and concentrated in vacuo. The crude product was recrystallized from IPA/hexanes, affording 0.642 g of the title compound as a colorless, amorphous solid. The mother liquor was concentrated and purified by flash chromatography (EtOAc/hexanes), affording an additional 0.241 g of the title compound: 1H NMR (400 MHz, CDCl3) δ 7.61 (d, J=8.9 Hz, 1H), 7.07 (d, J=2.5 Hz, 1H), 6.85 (dd, J=8.9, 2.6 Hz, 1H), 5.70 (bs, 1H), 5.59 (bs, 1H), 4.12 (s, 2H), 3.38 (s, 2H), 1.03 (s, 9H).

1. temperatureat reflux under N2
2. temperatureAfter cooling to rt
3. stirringstirred 30 min
4. customthe layers were separated
5. extractionThe aqueous layer was extracted with CH2Cl2 (×2)
6. washcombined organics were washed (water, brine)
7. dry with materialdried over Na2SO4
8. filtrationfiltered
9. concentrationconcentrated in vacuo
10. customThe crude product was recrystallized from IPA/hexanes