已经制备了许多2-苯基-4 H-苯并[ b ]硫吡喃-4-酮(硫代黄酮)和相关化合物以测试其抗菌活性。还制备了黄酮衍生物以与其抗菌活性进行比较。发现羟基硫代黄酮很容易通过用氯化铝使甲氧基硫代黄酮脱甲基而制得。在抗菌活性测试中,发现甲氧基或羟基硫代黄酮没有活性。建议将硫黄酮的砜或亚砜用于抗酵母菌和霉菌的抗菌活性。这些硫代黄酮衍生物表现出低的急性毒性。
Antimicrobial activity of 3-(substituted methyl)-2-phenyl-4<i>H</i>-l-benzothiopyran-4-ones
作者:Hiroyuki Nakazumi、Tamio Ueyama、Teijiro Kitao
DOI:10.1002/jhet.5570220625
日期:1985.11
A series of 3-(substitutedMethyl)-2-phenyl-4H-l-benzothiopyran-4-ones (thioflavones) and thioflavone 1,1-dioxides was prepared to test for antimicrobialactivity and for antitumor activity. It was shown that an introduction of a substitutedmethyl group in the 3-position of thioflavone resulted in significant antimicrobialactivity against Trichophytons. 3-(Acetoxymethyl)thioflavone shows the most
carboxylation of alkynes with CO2 is a sustainable and important strategy to generate valuable acrylate derivatives from both readily available starting materials. Such protocols, however, always suffer from the use of excess metallic reagents and transitionmetal residue. Herein, we report the first thio-carboxylation of alkynes with thiophenols and CO2, which is a visible-light-driven and transition metal-free
用 CO 2对炔烃进行双官能团羧化是一种可持续且重要的策略,可以从两种现成的起始材料中生成有价值的丙烯酸酯衍生物。然而,此类协议总是会使用过量的金属试剂和过渡金属残留物。在此,我们报道了炔烃与苯硫酚和 CO 2的第一次硫代羧化反应,这是一个可见光驱动且无过渡金属的过程。与之前通过CO 2的双电子活化对炔烃进行羧化反应相比,机理和计算研究表明 CO 2的单电子活化参与硫代羧化,呈现独特的β-羧化。随后的环化酰化有效地提供了重要的硫色酮。此外,一锅法具有温和的反应条件(室温,1 个大气压的 CO 2)、高化学和区域选择性、易于扩展和易于将产物衍生为生物活性化合物。
Synthesis of Fluoromethylated Chromones and Their Heteroatom Analogues via Sodium Fluoromethanesulfinate-Enabled Direct Fluoromethylation
作者:Kaiyue Yang、Dongxue Yin、Yuli Sun、Zhifang Yang、Yadong Li、Lingzhi Xu、Yunfei Du
DOI:10.1021/acs.joc.3c02301
日期:2024.1.5
their heteroatom analogues were conveniently synthesized from the reaction of chromones and their heteroatom analogues with CF3SO2Na or HCF2SO2Na in the presence of tert-butyl hydroperoxide under mild conditions. A mechanistic pathway involving the generation of the electrophilic tri/difluoromethyl radical, followed with the radical substitution of chromones and their heteroatom analogues, was postulated
在叔丁基过氧化氢存在下,在温和条件下,通过色酮及其杂原子类似物与CF 3 SO 2 Na或HCF 2 SO 2 Na的反应,方便地合成了一系列具有生物学意义的三/二氟甲基化色酮及其杂原子类似物。假设了一种机械途径,涉及亲电子三/二氟甲基自由基的产生,然后是色酮及其杂原子类似物的自由基取代。
Watanabe, Shigeru; Nakazumi, Hiroyuki; Kado, Seiji, Journal of Chemical Research, Miniprint, 1990, # 2, p. 546 - 586