New 6-substituted and 2,6-disubstituted pyridazinone derivatives were obtained starting from easily accessible alkyl furans by using oxidation with singlet oxygen to give 4-methoxy or 4-hydroxybutenolides, key intermediates of this synthetic strategy. The new pyridazinone derivatives have been studied as vasorelaxant and antiplatelet agents. Analysis of biological data revealed the silyl ethers (4a-i) and N,O-dibenzyl derivatives (6g-i) as the most active compounds. (C) 2010 Elsevier Ltd. All rights reserved.
Novel Pyridazin-3(2<i>H</i>)-one-Based Guanidine Derivatives as Potential DNA Minor Groove Binders with Anticancer Activity
Novel aryl guanidinium analogues containing the pyridazin-3(2H)-one core were proposed as minor groove binders (MGBs) with the support of molecular docking studies. The target dicationic or monocationic compounds, which show the guanidium group at different positions of the pyridazinone moiety, were synthesized using the corresponding silyl-protected pyridazinones as key intermediates. Pyridazinone
在分子对接研究的支持下,提出了含有 pyridazin-3(2 H )-one 核心的新型芳基胍类似物作为小沟粘合剂 (MGBs)。使用相应的甲硅烷基保护的哒嗪酮作为关键中间体,合成了在哒嗪酮部分不同位置显示胍基的目标双阳离子或单阳离子化合物。哒嗪酮支架被转化为足够的溴代烷基衍生物,通过与N , N' - di -Boc-保护的胍反应,然后酸水解,以良好的收率提供盐酸盐1-14。新哒哒嗪3( 2H )的能力)-one-based 胍作为 DNA 粘合剂通过 DNA 紫外热变性实验进行了研究。还在三种癌细胞系(NCI-H460、A2780 和 MCF-7)中探索了它们的抗增殖活性。具有双胍结构的化合物1-4显示出较弱的 DNA 结合亲和力,并在所研究的三种癌细胞系中表现出合理的细胞活力抑制百分比。
Synthesis and complete assignment of the 1H and 13C NMR spectra of 6-substituted and 2,6-disubstituted pyridazin-3(2H)-ones
Several pyridazin‐3(2H)‐one derivatives were synthesized starting from alkyl furans using oxidation with singlet oxygen to give 4‐methoxy or 4‐hydroxybutenolides, key intermediates of the synthetic strategy followed. For all pyridazinones reported, a completeassignment of the 1H and 13CNMRspectra using one‐ and two‐dimensional NMR spectroscopic methods, which included NOE, DEPT, COSY, HSQC and HMBC