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

Beteiligte Stoffe

Reaktionsschritte

A mixture of 6-hydroxy-2H-1-benzopyran-3-carboxaldehyde (25.0 g, 0.14 mol) and potassium carbonate (39.2 g, 0.28 mol) in 500 ml of DMF is treated with benzyl bromide (26.7 g, 0.16 mol). The mixture is stirred overnight at room temperature. Water is added and three extractions with dichloromethane are carried out. The extract is dried (MgSO4) and evaporated to dryness. The residue is crystallized from hot ethyl acetate to give 6-benzyloxy-2H-1-benzopyran-3-carboxaldehyde, m.p. 112°-114° C.

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