Triethylamine → Methyl 4-oxo-4-[[5-(2-trimethylsilylethynyl)-2-pyridyl]amino]butanoate

Participants

Reaction Conditions

Reaction Steps

To a solution of methyl 4-[(5-bromo-2-pyridyl)amino]-4-oxo-butanoate (commercially available: 0.25 g, 0.871 mmol) in tetrahydrofuran was added bis(triphenylphosphine) palladium(II) dichloride (61.7536 mg, 0.087 mmol), copper(I) iodide (16.6 mg, 0.087 mmol), triethylamine (889 mg, 1.23 mL, 8.70 mmol) and ethynyltrimethylsilane (130 mg, 0.19 mL, 1.30 mmol). The reaction mixture was stirred at 65° C. overnight. The reaction was stopped and the solution was partitioned between ethyl acetate and water. The aqueous layer was separated and extracted with ethyl acetate (2×). The combined organic layer was dried on magnesium sulfate and concentrated under vacuum. The residue was purified by flash chromatography eluting with cyclohexane-ethyl acetate (3/1) to give methyl 4-oxo-4-[[5-(2-trimethylsilylethynyl)-2-pyridyl]amino]butanoate (26 mg, 10% yield). 1H NMR (400 MHz, CDCl3) 8.39 (s, 1H), 8.14 (m, 2H), 7.74 (d, 1H), 3.72 (s, 3H), 2.74 (m, 4H), 0.24 (s, 9H) ppm.

Provenance & Evidence