Triethylamine → 1h-Pyrrolo[2,3-c]pyridine-5-carboxylic acid,4-[(1e)-2-ethoxyethenyl]-1-[(4-fluorophenyl)methyl]-,methyl ester

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Reaction Conditions

Reaction Steps

To a stirred solution of methyl 1-(4-fluorobenzyl)-4-[(trifluoroacetyl)oxy]-1H-pyrrolo[2,3-c]pyridine-5-carboxylate (1.4 g, 3.24 mmol) and (E)-2-ethoxyvinyl tributyltin (E [prepared according to A. Leusik, H. A. Budding, J. W. Marsman, J. Organomet. Chem., 1967, 9, 285-294] (2.2 g, 6.48 mmol) in DMF (10 mL) under a nitrogen atmosphere were added triethylamine (0.48 mL, 3.24 mmol) and dichlorobis(triphenylphosphine)palladium(II) (0.24 g, 0.32 mmol). The resulting mixture was heated to 140° C. for 2 hours. It was quenched with water, and extracted with ethyl acetate three times. The combined organic extracts were washed with water (2×30 mL), dried over sodium sulfate, concentrated in vacuo and purified by Biotage flash chromatography. Elution with hexane:ethyl acetate (1:1) provided the title compound as brown glue (0.40 g, 35% yield). 1H NMR (MeOD) δ; 8.50 (s, 1H), 7.64 (d, 1H, J=3.3 Hz), 7.22 (t, 2H, J=6.8 Hz), 7.05 (t, 2H, J=6.8 Hz), 6.89 (d, 1H, J=3.3 Hz), 5.53 (s, 2H), 4.02 (q, 2H, J=7.1 Hz), 1.37 (t, 3H, J=7.1 Hz). LCMS (APCl, M+H+): 355.2.

Provenance & Evidence