反应详情

Diethyl ethoxymethylenemalonate (10.1 mL, 50 mmole) and formamidine acetate (10.4 g, 100 mmole) were refluxed in ethanol (10 mL) for 24 hours. The reaction mixture was allowed to cool to room temperature overnight, and suspended in ethyl acetate (30 mL) and 1.0N HCl (20 mL). The suspension was filtered, and the filter cake was washed with 1.0N HCl, followed by water, then ethyl acetate, and air dried affording the title compound as an tan solid (3.33 g, 40% yield). Rf=0.21 (silica gel, 10% methanol in dichloromethane). m.p. 187-188° C.

1. filtrationThe suspension was filtered
2. washthe filter cake was washed with 1.0N HCl
3. dry with materialethyl acetate, and air dried