2-Propynoic acid, 3-(4-fluorophenyl)-, methyl ester → HCID 17962385, compound

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Reaction Steps

To a stirred solution of methyl 3-(4-fluorophenyl)propiolate (Example 1 b) and 1-amino-3-methylpyridinium 2,4,6-trimethylbenzenesulfonate in dry acetonitrile was added, dropwise over 10 min, a solution of 1,8-diazabicycloundec-7-ene in dry acetonitrile. The mixture was allowed to stir at room temperature for about 18 h. The solvent was evaporated under reduced pressure and the residue was partitioned between water and ethyl acetate and the organic phase separated. The aqueous was extracted with ethyl acetate and the combined organic extracts are dried (MgSO4), and the solvent removed under vacuum. The residue was purified by chromatography on silica gel using 10:1 hexanes:ethyl acetate as eluent to give the title compound and also methyl 2-(4-fluorophenyl)-4-methyl-pyrazolo[1,5-a]pyridine-3-carboxylate.

Provenance & Evidence