Carbon Dioxide → 2-((tert-Butoxycarbonyl)amino)-5-(trifluoromethoxy)benzoic acid

Temperature

-78 °C

A solution of (4-trifluoromethoxy-phenyl)-carbamic acid tert-butyl ester (2.31 g, 8.33 mMol) in anhydrous THF (50 mL) at −78° C. was treated with a 1.4 M solution of sec-butyllithium in cyclohexane (13 mL, 18.33 mMol), at a rate which did not allow the internal temperature to exceed −60° C. The solution was stirred at −78° C. for 15 minutes, then allowed to warm to −40° C. and stirred for 2.5 hours. The reaction was treated with gaseous CO2, stirred 30 minutes while warming to −20° C., then quenched with saturated ammonium chloride. The mixture was warmed to room temperature, and extracted with ethyl acetate (3×50 mL). The combined organic phases were washed with water (50 mL), brine (50 mL), dried over sodium sulfate, and concentrated in-vacuo. The residue was triturated with hot heptane to yield 1.9 g of white powder as product. NMR (500 MHz, DMSO) δ 12.89 (s, 1H), 8.24 (d, 1 H, J=9 Hz), 7.84 (s, 1H), 7.21 (d, 1H, J=7 Hz), 1.51 (s, 9 Hz). Yield=72%.

1. customto exceed −60° C
2. temperatureto warm to −40° C.
3. stirringstirred for 2.5 hours
4. stirringstirred 30 minutes
5. temperaturewhile warming to −20° C.
6. customquenched with saturated ammonium chloride
7. temperatureThe mixture was warmed to room temperature
8. extractionextracted with ethyl acetate (3×50 mL)
9. washThe combined organic phases were washed with water (50 mL), brine (50 mL)
10. dry with materialdried over sodium sulfate
11. concentrationconcentrated in-vacuo
12. customThe residue was triturated with hot heptane

ORD record

ord-d1cf602639b44c16b0f6e6781b2bafea

Source dataset

uspto-grants-2007_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07183270B2