Water → 6-phenoxy-2H-1-benzopyran-3-carboxaldehyde

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Reaction Steps

A mixture of 5-phenoxysalicylaldehyde (15.0 g, 70.0 mmol, see example 2d) and potassium carbonate (19.4 g, 140.0 mmol) in 250 ml of 1,4-dioxane is treated with acrolein (4.32 g, 77.0 mmol) under nitrogen. The mixture is heated at reflux for 6 hours. Water is added and the mixture is extracted with dichloromethane. The organic layer is dried (MgSO4) and evaporated. The residue is purified by flash chromatography (silica gel, 10% EtOAc/hexane) to give 6-phenoxy-2H-1-benzopyran-3-carboxaldehyde, as a fluorescent solid.

Provenance & Evidence