Synthesis of structural fragments of natural flavonoids and flavolignans from 2-hydroxychalcones

New 2′-O-acetylchalcones and 2-hetaryl-3-aminochromones modified with 6-halogen-1,3-benzodioxane, 1,4-benzodioxane, and 1,5-benzodioxepan groups were synthesized as structural analogues of natural flavonoids. The structure of the prepared compounds was confirmed by 1H NMR spectra.