Trimethylsilylacetylene → HCID 67228299, compound

Participants

Reaction Conditions

Reaction Steps

Trimethylsilyl acetylene (10.5 mL, 79.1 mmol) was added to a solution of 6-amino-5-iodo-nicotinic acid methyl ester (11 g, 39.6 mmol), copper (I) iodide (754 mg, 4.0 mmol), tetrakis(triphenylphosphine)palladium(0) (2.3 g, 2.0 mmol) and diisopropylethylamine (21 mL, 118.7 mmol) in N,N-dimethyl formamide (80 mL) at 0° C. After addition, the reaction mixture was allowed to warm up to 25° C. and stirred for 2 h. The mixture was extracted with ethyl acetate, washed with brine and dried over sodium sulfate. The solvent was evaporated in vacuo and the residue was purified by flash column chromatography (QingDao silica gel, 200-300 mesh, 5% dichloromethane/hexanes to 60% dichloromethane/hexanes) to afford 6-amino-5-trimethylsilanylethynyl-nicotinic acid methyl ester (7.1 g, 72%) as a light yellow solid: 1H NMR (400 MHz, CDCl3) δ ppm 0.28 (s, 9H), 3.88 (s, 3H), 5.58 (br. s., 2H), 8.14 (d, J=2.2 Hz, 1H), 8.66 (d, J=2.2 Hz, 1H).

Provenance & Evidence