反应详情

To a 0° C. solution of 3-methyl-4′-trifluoromethyl-biphenyl-4-carboxylic acid methyl ester (300 mg, 1.02 mmol) in THF/MeOH (10/3 mL) is added portion-wise sodium borohydride (386 mg, 10.20 mmol) and heated to reflux. After 1 h TLC (20% EtOAc/hexane) indicates complete consumption of starting material. The reaction mixture is concentrated and the residue is partitioned between EtOAc (100 mL) and 0.2N HCl (20 mL). The aqueous layer is extracted with a second portion of EtOAc (50 mL). The combined organic layers are washed with brine, dried (MgSO4), filtered and concentrated to yield the title compound (268 mg, 99%). 1NMR (400 MHz, CDCl3) δ ppm: 7.69 (s, 4H), 7.50-7.39 (m, 3H), 4.77 (s, 2H), 2.44 (s, 3H).

1. temperatureheated to reflux
2. customconsumption of starting material
3. concentrationThe reaction mixture is concentrated
4. customthe residue is partitioned between EtOAc (100 mL) and 0.2N HCl (20 mL)
5. extractionThe aqueous layer is extracted with a second portion of EtOAc (50 mL)
6. washThe combined organic layers are washed with brine
7. dry with materialdried (MgSO4)
8. filtrationfiltered
9. concentrationconcentrated