2,6-Dibromopyridine → n-[1-Eth-(z)-ylidene-5,5-dimethoxy-2-oxo-pentyl]acrylimidoyl bromide

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a suspension of 2,6-dibromopyridine (8.1 g, 34.03 mmol) in 80 mL of ether at −70° C., is added BuLi (12.3 mL, 26.17 mmol, 2.5 M in Hexane) in on portion. After stirring at 70° C. for 5 min, 4,4,N-Trimethoxy-N-methyl-butyramide (5.0 g, 26.17 mmol) is added to the solution dropwise. After stirring at −70° C. for 1.5 hr, the reaction mixture is quenched with 120 mL of water and extracted with 3×130 mL of EtOAc. The combined organic layers is concentrated and purified by chromatography (Hexane/EtOAc:70/30) to give N-[1-Eth-(Z)-ylidene-5,5-dimethoxy-2-oxo-pentyl]-acrylimidoyl bromide (5.96 g, 60.5%) as light yellow liquid. M/Z=288.0

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