| Abstract: | New benzob]xanthone derivatives, having substituents in the A and D rings, were prepared from cycloaddition reactions of chromone-3-carboxaldehydes
with ortho-benzoquinodimethanes, generated in situ from 1,3-dihydrobenzoc]thiophene 2,2-dioxide, followed by oxidation of the obtained diastereomeric adducts. The structure of all compounds was fully
established by 1D and 2D NMR, MS, and elemental analysis. The stereochemistry of the obtained diastereomeric cycloadducts
was established by NOESY experiments. |
