反应详情

温度

108 °C

4,5-Dimethoxy-benzene-1,2-diamine (2.02 g; 12.0 mmoles) and 3,3,3-trifluoro-2-hydroxy-propionic acid (2.67 g; 18.5 mmoles) were suspended in 6N HCl (5 mL; 30 mmoles) and water (4 mL) under a nitrogen atmosphere. The reaction was stirred vigorously and heated to 108° C. for 18 hrs, then cooled to room temperature. The reaction was diluted with water (40 mL) and with ethyl acetate (40 mL), then sodium bicarbonate (3.84 g; 46.0 mmoles) was added slowly and in portions to quench the reaction. The aqueous layer was separated and extracted with ethyl acetate (3×30 mL). The extracts were combined, washed with water (30 mL) and brine (40 mL), then dried over Na2SO4. The filtrate was concentrated in vacuo to yield a crude dark orange solid which was then purified by column chromatography (SiO2; 30% ethyl acetate/CH2Cl2) to yield the title compound as a bright orange solid.

1. temperaturecooled to room temperature
2. customto quench
3. customthe reaction
4. customThe aqueous layer was separated
5. extractionextracted with ethyl acetate (3×30 mL)
6. washwashed with water (30 mL) and brine (40 mL)
7. dry with materialdried over Na2SO4
8. concentrationThe filtrate was concentrated in vacuo
9. customto yield a crude dark orange solid which
10. customwas then purified by column chromatography (SiO2; 30% ethyl acetate/CH2Cl2)