Ammonium Chloride → 3-Cyano-5-[6-(N,N-diethylamino)benzo[b]furanylmethylene]-4-phenyl-2-furanone

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Reaction Conditions

Reaction Steps

To 5 mL of pyridine in a 15 mL round-bottom flask was added 217 mg (1 mmol) of the compound of Example 2 and 172 mg (1 mmol) of 3-cyano-4-phenyl-2-furanone. The solution was heated at 80° C. for one hour, colled and poured into 20 mL dilute NH4Cl. The resulting mixture was extracted 2X with 20 mL 3:2 hexanes Et2O and the combined organic extracts were washed once with 10 mL of water, The organic phase was dried (MgSO4) and the solvent removed by rotary evaporation. The resulting solid was purified by flash chromatography (7:2 cyclohexane/EtOAc; SiO2, 1 ×12") to yield 292 mg of dye. Anal. calcd. for C24H20N2O3 : C, 74.2; H, 5.4; N, 7.5. Found: C, 74.0; H, 5.2; N, 6.9.

Provenance & Evidence