Synthesis of Fluorescent, DNA-Binding Benzo[<i>b</i>]indolonaphthyridinium Derivatives by a Misguided Westphal Condensation
作者:Philipp Groß、Heiko Ihmels
DOI:10.1021/acs.joc.1c02755
日期:2022.3.18
A novel type of azoniahetarene, namely, benzo[b]indolonaphthyridinium, was unexpectedly formed by the reaction of N-alkylated β-carbolinium derivatives and the enolizable 1,2-cyclohexadione under typical conditions of a Westphal reaction. The products exhibit high fluorescence intensities in polar solvents (Φfl = 0.52–0.67) and bind to DNA by intercalation with high affinity (Kb = 1.5 × 106 M–1). Furthermore
在 Westphal 反应的典型条件下, N-烷基化 β-咔啉衍生物和可烯醇化的 1,2-环己二酮反应出乎意料地形成了一种新型的氮杂杂环芳烃,即苯并[ b ]吲哚萘啶鎓。产物在极性溶剂中表现出高荧光强度 (Φ fl = 0.52–0.67),并通过插入以高亲和力与 DNA 结合 ( K b = 1.5 × 10 6 M –1 )。此外,在相同条件下,通过 Westphal 反应从具有至少一个非烯醇化 α-碳原子的 1,2-二酮合成 DNA 结合 sempervirine 衍生物,这表明反应途径由底物结构决定。