Sodium Nitrite → Ethyl 2-(6-chloro-5-(2,2,2-trifluoroethoxy)-4'-(trifluoromethyl)biphenyl-3-yl)-3-cyclopropylpropanoate

Temperature

90 °C

Ethyl 2-(6-amino-5-(2,2,2-trifluoroethoxy)-4′-(trifluoromethyl)biphenyl-3-yl)-3-cyclopropylpropanoate (0.85 g, 1.78 mmol) was dissolved in a mixture of MeCN/H2O/HCl 15 mL/15 mL/2 mL at 0° C. A solution of NaNO2 (0.185 g, 2.68 mmol) in water (2 mL) was added drop wise at 0° C., and the reaction mixture was stirred for 40 min, at the same temperature. A solution of CuCl (1.8 g, 17.8 mmol) in water (10 mL) was added drop wise at 0° C. The reaction mixture was heated to 90° C. for 2 h. The reaction mixture was extracted with EtOAc (3×50 mL), and the combined organic layers were washed with water (50 mL) followed by brine (50 mL). The solution was dried over Na2SO4, filtered and concentrated under reduced pressure to give an oil. The oil was purified by chromatography over silica gel (hexane/EtOAc) to give ethyl 2-(6-chloro-5-(2,2,2-trifluoroethoxy)-4′-(trifluoromethyl)biphenyl-3-yl)-3-cyclopropylpropanoate (0.528 g) as a yellow oil.

1. extractionThe reaction mixture was extracted with EtOAc (3×50 mL)
2. washthe combined organic layers were washed with water (50 mL)
3. dry with materialThe solution was dried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customto give an oil
7. customThe oil was purified by chromatography over silica gel (hexane/EtOAc)

ORD record

ord-cf1e49777496468081d196782406a150

Source dataset

uspto-grants-2013_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08367863B2