Triethylamine → Ethyl 3-(6-acetylamino-pyrid-3-yl)-but-2-enoate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of N-(5-bromopyrid-2-yl)acetamide (31.4 g, Reference Example 23), ethyl crotonate (37.0 mL), triethylamine (33 mL), tetrakis(tri-o-tolylphosphine)palladium(0) and tetrabutylammonium bromide (9.36 g) in dimethylformamide (250 mL) was heated at 100° C. under an argon atmosphere for 48 hours. The reaction mixture was cooled and then evaporated. The residue was partitioned between ethyl acetate and water and the organic phase was washed with brine, then dried over magnesium sulphate and then evaporated. The resulting light brown solid was subjected to flash chromatography on silica eluting with a mixture of pentane and ethyl acetate (7:3, v/v) to give the title compound (27.3 g) as a pale yellow solid.

Herkunft & Nachweise