This article reports the diastereoselective synthesis of some novel naphthalimido and bis-naphthalimido β-lactam derivatives and a preliminary evaluation of their anticancer properties. The reactions were completely diastereoselective, leading exclusively to the formation of cis-β-lactams 11a–l and trans-bis-β-lactams 16a–g. All of these compounds were obtained in good to excellent yields and their structures were established based on IR, ¹H NMR, ¹³C NMR spectral data, and elemental analysis. Each of the β-lactams was screened for antioxidant and anticancer activities. Our results showed that all the compounds lacked cytotoxicity against HepG2 cells, whereas 16a and 16b exhibited excellent anticancer activity with IC₅₀ values below 191.57 µM on MCF-7 cell line and also, bis-β-lactams 16a–g showed excellent antitumor activity against the TC-1 cell line. Antioxidant experiments of 16a–d by the diphenylpicrylhydrazyl (DPPH) assay showed IC₅₀ values ranging from 7 to 32.3 µg/ml. Interaction of 16a, 16b, 16d–g with calf-thymus DNA (CT-DNA) was also supported by absorption titration studies. The compounds exhibit good binding propensity to CT-DNA and the DNA binding affinity (K_b) of the compounds varies as 16a; 16b; 16e; 16g > 16d; 16f. Interaction of 16d with CT-DNA was also investigated by fluorescence spectroscopy. The results support an intercalative interaction of 16d and 16f and non-intercalation mechanism for 16a, 16b, 16e, and 16g.

中文翻译：

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单和双萘二甲酰亚胺β-内酰胺偶联物的细胞毒性，抗癌和抗氧化特性

本文报道了一些新的萘二甲酰亚胺和双萘二甲酰胺β-内酰胺衍生物的非对映选择性合成及其抗癌性能的初步评估。这些反应是完全非对映选择性的，仅导致顺式-β-内酰胺11a-1和反式-双-β-内酰胺16a-g的形成。所有这些化合物均以优异的产率获得，并基于IR，¹ H NMR，¹³ C NMR光谱数据和元素分析建立了结构。筛选每种β-内酰胺的抗氧化和抗癌活性。我们的结果表明，所有化合物均对HepG2没有细胞毒性细胞，而16a和16b在MCF-7细胞系中表现出优异的抗癌活性，IC ₅₀值低于191.57 µM，并且，bis-β-内酰胺类16a-g对TC-1细胞系表现出优异的抗肿瘤活性。通过二苯基吡啶甲基肼基（DPPH）分析对16a-d进行的抗氧化剂实验表明，IC ₅₀值范围为7至32.3 µg / ml。吸收滴定研究也支持了16a，16b，16d–g与小牛胸腺DNA（CT-DNA）的相互作用。这些化合物对CT-DNA具有良好的结合倾向以及与DNA的结合亲和力（K_b）的化合物为16a；16b; 16e; 16g  >  16d ; 16楼。还通过荧光光谱研究了16d与CT-DNA的相互作用。结果支持16d和16f的插入相互作用以及16a，16b，16e和16g的非插入机制。