| Summary: | The synthesis of five new analogues of benzopsoralens, derived from xanthen-9-one and carbazole is described. The preparation of the hydroxylated precursors, their formylation and the formation of the pyranone ring, by the reaction between ortho-formylated heterocycles and diethyl malonate in EtOH, will be discussed. The inhibitory effect on the growth of human tumour cell lines (MCF-7, SF-268 and NCI-460) of the final products was evaluated and is discussed in terms of the 3D-geometry and electronic density distribution. The compounds showing significant biological activity in this study were those having angular structures.
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