Triethylamine → 3-(4-fluoro-3-nitrobenzylidene)-3H-isobenzofuran-1-one

Beteiligte Stoffe

Reaktionsschritte

A stirred solution of dimethyl 3-oxo-1,3-dihydroisobenzofuran-1-ylphosphonate (20 g, 0.083 mol) and 4-fluoro-3-nitrobenzaldehyde (13.97 g, 0.083 mol) in tetrahydrofuran (120 ml) was cooled to 15° C. and triethylamine (11.5 ml, 0.083 mol) was added dropwise at <25° C. The mixture thickened at this point, so further tetrahydrofuran (50 ml) was added to aid stirring. The mixture was stirred at ambient temperature for 65 hours and the resulting solid was collected by filtration. The filtrate was concentrated in vacuo, the residue was triturated with water (30 ml) and the resulting solid was collected by filtration. The two crops of solid were combined and suspended in water (120 ml). The mixture was stirred at ambient temperature for 30 minutes and the resulting solid was collected by filtration and dried in vacuo for 24 hours to give crude 3-(4-fluoro-3-nitrobenzylidene)-3H-isobenzofuran-1-one, still slightly wet with water, which was used directly in the next stage.

Herkunft & Nachweise