Carbonate Ion → N-[5-[2-(3,5-Dimethoxyphenyl)ethyl]-1H-pyrazol-3-yl]-4-[(3-fluoro-1-piperidyl)methyl]benzamide

Beteiligte Stoffe

Reaktionsschritte

A solution of NaHMDS in THF (1 M, 0.86 ml, 0.86 mmol, 1.5 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-[(3-fluoro-1-piperidyl)methyl]benzoate (174 mg, 0.69 mmol, 1.2 eq) in THF (1 ml). The reaction mixture was stirred at ambient temperature for 2 h. The reaction mixture was then concentrated and the crude product was purified by reverse-phase prep. HPLC (acidic) using a gradient of acetonitrile in water containing 0.1% TFA. The clean fractions were taken and evaporated. The residue was dissolved in 3:1 DCM:MeCN mixture (4 ml) and MP-carbonate (2.74 mmol/g, 1 g, 2.74 mmol) was added. The mixture was stirred for 4 h, filtered and the filtrate evaporated to afford the title compound as a pale yellow gum (43 mg, 16% yield); 1H NMR (399.902 MHz, DMSO) δ 1.46-1.34 (2H, m), 1.82-1.61 (2H, m), 2.36-2.28 (2H, m), 2.66-2.56 (2H, m), 2.81 (4H, s), 3.50 (2H, s), 3.65 (6H, s), 4.66-4.47 (1H, m), 6.26-6.24 (1H, m), 6.35 (2H, d), 6.40 (1H, s), 7.32 (2H, d), 7.88 (2H, d), 10.51 (1H, br.s), 12.07 (1H, br.s).

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