Cesium carbonate → HCID 68846090, compound

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Reaction Steps

tert-Butyl N-(2-aminoethyl)carbamate (10.6 g) was added to a solution of (methoxyphenylmethylene)methane-1,1-dicarbonitrile (10.4 g) in acetonitrile (350 mL), and the mixture was stirred for 10 minutes. Anhydrous cesium carbonate (65.1 g) and methyl bromoacetate (13.5 mL) were added, and the mixture was heated to reflux for 1 hour. After cooling the mixture to room temperature, it was allowed to stand, the supernatant was separated by decantation, and the solvent was distilled off under reduced pressure. The concentrated residue was combined with the solid portion remaining after decantation, ethyl acetate and water were added, and extraction was performed 3 times with ethyl acetate. The organic layer was washed with water and saturated brine and then dried over anhydrous magnesium sulfate. After filtering off the magnesium sulfate, the solvent was distilled off under reduced pressure. The residue was purified by silica gel column chromatography (hexane/ethyl acetate 2/1) to obtain the title compound (20.6 g, yield: 95%) as a yellow transparent oil. The NMR and ESI/MS data for this compound-are shown below.

Provenance & Evidence