Ammonium Chloride → 4'-[3-[Hydroxyimino]-3-(2-methyl-pyridin-4-yl)-1-o-tolyl-propyl]-biphenyl-4-carboxylic acid methyl ester

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A solution of 4′-[3-(2-methyl-pyridin-4-yl)-3-oxo-1-o-tolyl-propyl]-biphenyl-4-carboxylic acid methyl ester (36 mg), hydroxylamine hydrochloride (11 mg) and sodium hydrogencarbonate (14 mg) in a mixture of ethanol (0.5 mL) and water (0.1 mL) was heated under reflux for 1.5 hours. A saturated solution of NH4Cl was added, the phases were separated and the inorganic one was extracted with EtOAc (2×). The combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated in vacuo. The crude product was purified by flash chromatography on silica gel (EtOAc/n-heptane 2:1) to yield the title compound as a mixture of E and Z isomers (3.3:1) as a white foam (28 mg, 75%), MS (ESI+): m/z=465.2 ([M+H]+).

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