Synthesis, Cytotoxic Activity, and Mechanism of Action of Furo[2,3-c]acridin-6-one and Benzo[b]furo[3,2-h]acridin-6-one Analogues of Psorospermin and Acronycine

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• 作者：Sabrina Boutefnouchet ; Nicolas Gaboriaud-Kolar ; Nguyen Tuan Minh ; Sabine Depauw ; Marie-Hlne David-Cordonnier ; Bruno Pfeiffer ; Stphane Lonce ; Alain Pierr ; Franois Tillequin ; Marie-Christine Lallemand ; S
• 刊名：Journal of Medicinal Chemistry
• 出版年：2008
• 出版时间：November 27, 2008
• 年：2008
• 卷：51
• 期：22
• 页码：7287-7297
• 全文大小：336K
• 年卷期：v.51,no.22(November 27, 2008)
• ISSN：1520-4804

文摘

Compounds possessing the epoxyfuran system present in the natural cytotoxic dihydrofuroxanthone psorospermin (4) fused onto the acridone or benzo[b]acridone chromophores present in the antitumor acronycine (1) and S23906-1 (3) were prepared. The basic furoacridone and benzofuroacridone cores bearing an isopropenyl substituent at a convenient position were synthesized by condensation of 1,3-dihydroxyacridone (7) or 1,3-dihydroxybenz[b]acridin-12(5H)-one (9) with (E)-1,4-dibromo-2-methylbut-2-ene. In both series, the (2R*,1′S*) epoxides, with the same relative configuration as psorospermin, were the most active compounds, exhibiting cytotoxic properties with IC₅₀ values in the 10−100 nM range. As in the acronycine and psorospermin series, the new compounds act through alkylation of the DNA guanine units. However, a strong difference was noted in the DNA alkylation site between the benzopyranoacridone S23906-1, which alkylates DNA guanine units at position N-2 in the minor groove, and the new 13H-benzo[b]furo[3,2-h]acridin-6-one derived epoxide 21, which alkylates DNA guanine units at position N-7 in the major groove.