A series of chrysin derivatives were prepared from 2-hydroxyacetophenone, 2,4-dihydroxyacetophenone, 2,4,6- trihydroxy- acetophenone, using modified Baker-Venkataraman transformation. Their anticancer activities in vitro were evaluated by the standard MTT method. The results of biological test showed that some of chrysin derivatives showed stronger anticancer activity than 5-fluorouracil.
A practical synthesis of flavones from methyl salicylate
作者:Dhanapalan Nagarathnam、Mark Cushman
DOI:10.1016/s0040-4020(01)87119-2
日期:1991.1
A facile synthetic method has been developed for the conversion of methyl salicylate (5) into flavones 1a-i in high yields. Compound 5 on treatment with t-butyldimethylsilyl chloride (6) gave the O-silyl protected ester 7. Condensation of this ester 7 with the lithium anion generated from acetophenones 3a-i yielded the 1.3-diarylpropane-1,3-diones 8a-i, which on treatment with glacial acetic acid containing
已经开发了一种简便的合成方法,用于将水杨酸甲酯(5)以高收率转化为黄酮1a-i。用叔丁基二甲基甲硅烷基氯(6)处理化合物5,得到O-甲硅烷基保护的酯7。将该酯7与由苯乙酮3a -i生成的锂阴离子进行缩合,得到1.3-二芳基丙烷-1,3-二酮8a-i,将其用含0.5%H 2 SO 4的冰醋酸在95- ℃处理3小时。 100°C以83–94%的收率提供了所需的黄酮1a-i。
Preference for<i>O</i>-demethylation reactions in the oxidation of 2′-, 3′-, and 4′-methoxyflavones by human cytochrome P450 enzymes
2'-, 3'-, and 4'-Methoxyflavones (MeFs) were incubated with nine forms of recombinant humancytochromeP450 (P450 or CYP) enzymes in the presence of an NADPH-generating system and the products formed were analyzed with LC-MS/MS methods.CYP1B1.1 and 1B1.3 were highly active in demethylating 4'MeF to form 4'-hydroxyflavone (rate of 5.0 nmol/min/nmol P450) and further to 3',4'-dihydroxyflavone (rates
在产生NADPH的系统中,将2'-,3'-和4'-甲氧基黄酮(MeFs)与9种形式的重组人细胞色素P450(P450或CYP)酶一起孵育,并用LC- MS / MS方法.CYP1B1.1和1B1.3在4'MeF脱甲基形成4'-羟基黄酮(5.0 nmol / min / nmol P450的速率)和进一步生成3',4'-二羟基黄酮(速率为5%的活性)方面具有很高的活性。分别为2.1和0.66 nmol / min / nmol P450)。发现3'MeF被P450氧化为m / z 239(M-14)产物(大概为3'-羟基黄酮),然后氧化为3',4'-二羟基黄酮。P450还将2'MeF催化氧化为m / z 239(M-14)和m / z 255(M-14,M-14 + 16)产品,可能分别是单羟基和二羟基产品。将这些MeF与P450一起孵育时,至少形成了两种类型的具有m / z 269片段的环
One-Pot Allan-Robinson/Friedländer Route to Chromen-/Quinolin-4-ones through the Domino Acetylative Cyclisation of 2-Hydroxy-/2-Aminobenzaldehydes
作者:Vijai K. Rai、Fooleswar Verma、Ganeshwar P. Sahu、Manorama Singh、Ankita Rai
DOI:10.1002/ejoc.201701435
日期:2018.1.31
A domino reaction between 2‐hydroxy‐/2‐aminobenzaldehydes and α‐haloketones gives chromen‐4‐ones and quinolin‐4‐ones in good to excellent yields. This method represents a new extension of the Allan–Robinson and Friedländer reactions, and uses N‐heterocyclic‐carbene catalysis. This approach has the advantages of operational simplicity, ambient reaction conditions, and no by‐product formation.
[EN] PEPTIDOMIMETICS FOR THE TREATMENT OF CORONAVIRUS AND PICORNAVIRUS INFECTIONS<br/>[FR] PEPTIDOMIMÉTIQUES POUR LE TRAITEMENT D'INFECTIONS PAR CORONAVIRUS ET PICORNAVIRUS
申请人:UNIV EMORY
公开号:WO2020247665A1
公开(公告)日:2020-12-10
Compounds, compositions and methods for preventing, treating or curing a coronavirus, picornavirus, and/or Hepeviridae virus infection in human subjects or other animal hosts. Specific viruses that can be treated include enteroviruses. In one embodiment, the compounds can be used to treat an infection with a severe acute respiratory syndrome virus, such as human coronavirus 229E, SARS, MERS, SARS-CoV-1 (OC43), and SARS-CoV- 2. In another embodiment, the methods are used to treat a patient co-infected with two or more of these viruses, or a combination of one or more of these viruses and norovirus.