Benzoic acid, 4-(2-hydroxyethoxy)-, methyl ester → N-[5-[2-(3,5-dimethoxyphenyl)ethyl]-1H-pyrazol-3-yl]-4-(2-hydroxyethoxy)benzamide

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Reaction Steps

A solution of NaHMDS in THF (1 M, 1.15 ml, 1.15 mmol, 2 eq) was added dropwise at ambient temperature to a mixture of tert-butyl-5-amino-3-[2-(3,5-dimethoxyphenyl)ethyl]pyrazole-1-carboxylate (200 mg, 0.58 mmol, 1 eq) and methyl 4-(2-hydroxyethoxy)benzoate (136 mg, 0.69 mmol, 1.2 eq) in THF (1 ml). The reaction mixture was stirred at ambient temperature for 1 h. It was then concentrated and the crude product was purified by reverse-phase prep. HPLC (basic) using a gradient of acetonitrile in water containing 1% ammonium hydroxide solution. The clean fractions were taken and evaporated to afford the title compound as a colourless solid (29 mg, 12% yield); 1H NMR (399.902 MHz, DMSO) δ 2.89 (4H, s), 3.77-3.72 (8H, m), 4.07 (2H, t), 4.88 (1H, t), 6.34-6.33 (1H, m), 6.43 (2H, d), 6.46 (1H, s), 7.01 (2H, d), 7.98 (2H, d), 10.46 (1H, br.s), 12.12 (1H, br.s). MS: m/z 412 (MH+)

Provenance & Evidence