Lithium Hydroxide → 2'-Methyl-2-nitro-[1,1'-biphenyl]-4-carboxylic acid

참여 물질

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Methyl 2′-methyl-2-nitro-1,1′-biphenyl-4-carboxylate, prepared in step 1 (2.5 g, 9.2 mmol) was dissolved in dry THF (20 mL) and cooled to 0° C. To this solution was added lithium hydroxide (1.15 g, 27.6 mmol) in water (5 mL) and the mixture was stirred at RT for 4 h. The solvents were concentrated and the aqueous residue was washed with EtOAc. The aqueous layer was separated and acidified with 1.5N HCl to pH 2-3 and extracted with DCM. DCM was washed with water and dried over sodium sulphate and evaporated under reduced pressure to obtain the title compound as a yellow solid (1.6 g, 70%). 1H NMR: (DMSO-d6, 400 MHz) δ 13.67 (bs, 1H), 8.49 (s, 1H), 8.26-8.24 (d, 1H), 7.58-7.56 (m, 1H), 7.35-7.32 (m, 2H), 7.27-7.12 (d, 1H), 7.10 (d, 1H), 2.09-1.99 (s, 3H). LC/MS (Method A): 255.9 (M−H)−. HPLC (Method B) Rt 1.79 min (Purity: 99.16%).

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