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In an attempt to find new antitumor agents,a novel class of chromone compounds with a benzimidazole or a benzoxazole ring in positions 2 or 6 were synthesized via condensation in polyphosphoric acid(PPA) by using chromone acids as the starting materials. During the preparation process,it was found that PPA could cleave the chromone ring to produce a ring-opening compound(6). The molar ratio of the chromone compound(5) to the ring-opening compound(6) varied with the change of reaction temperature and time. Based on MTT protocol,the antitumor activity of each of the compounds obtained was evaluated against three human cancer cell lines: KB(oral epidermal),A2780(ovary) and Bel7402(liver). The IC_ 50 varied from 54.7 μmol/L to more than 180 μmol/L.
In an attempt to find new antitumor agents, a novel class of chromone compounds with a benzimidazole or a benzoxazole ring in positions 2 or 6 were synthesized via condensation in polyphosphoric acid (PPA) by using chromone acids as the starting materials. During the preparation process , it was found that PPA could cleave the chromone ring to produce a ring-opening compound (6). The molar ratio of the chromone compound (5) to the ring-opening compound (6) varied with the change of reaction temperature and time . Based on MTT protocol, the antitumor activity of each of the compounds obtained was evaluated against three human cancer cell lines: KB (oral epidermal), A2780 (ovary) and Bel7402 (liver). The IC_50 varied from 54.7 μmol / L to more than 180 μmol / L.