3602-54-8Relevant articles and documents
KNIPHOLONE: A UNIQUE ANTHRQUINONE DERIVATIVE FROM KNIPHOFIA FOLIOSA
Dagne, Ermias,Steglich, Wolfgang
, p. 1729 - 1732 (1984)
The roots of Kniphofia foliosa afforded, in addition to chrysophanol, a novel anthraquinone named knipholone, whose structure was determined by spectroscopic methods as well as by degradation to known compounds.Key Word Index - Kniphofia foliosa; Liliaceae; anthraquinone; chrysophanol; knipholone.
Effects of substituent pattern on the intracellular target of antiproliferative benzo[b]thiophenyl chromone derivatives
Goto, Masuo,Hamel, Ernest,Hirazawa, Sachika,Miura, Yuta,Nakagawa-Goto, Kyoko,Nakayoshi, Tomoki,Oda, Akifumi,Saito, Yohei,Taniguchi, Yukako,Tsurimoto, Hiroyuki,Yamashita, Katsumi
, (2021)
A new biological scaffold was produced by replacing the 6π-electron phenyl ring-B of a natural flavone skeleton with a 10π-electron benzothiophene (BT). Since aromatic rings are important for ligand protein interactions, this expansion of the π-electron system of ring-B might change the bioactivity profile. One of the resulting novel natural product-inspired compounds, 2-(benzo[b]thiophen-3-yl)-5-hydroxy-7-isopropoxy-6-methoxyflavone (6), effectively arrested the cell cycle at the G2/M phase and displayed significant antiproliferative effects with IC50 values of 0.05–0.08 μM against multiple human tumor cell lines, including a multidrug resistant line. A structure-activity relationship study revealed that a 10π-electron system with high aromaticity, juxtaposed 4-oxo and 5-hydroxy groups, and 7-alkoxy groups were important for potent antimitotic activity. Interestingly, two BT-flavonols (3-hydroxyflavone), 16 and 20, with 3-hydroxy and 5-alkoxy groups, induced distinct biological profiles affecting the cell cycle at the G1/S phase by inhibition of DNA replication through an interaction with topoisomerase I.
Annphenone, a phenolic acetophenone from Artemisia annua
Singh, Anil K.,Pathak, Vibha,Agrawal, Pawan K.
, p. 555 - 557 (1997)
Fractionation of the n-butanol extract of Artemisia annua led to the isolation of a new phenolic acetophenone, the structure of which was elucidated as 2,4-dihydroxy-6-methoxy-acetophenone 40-O-β-D-glucopyranoside on the basis of spectroscopic data.
Neuroregenerative Potential of Prenyl- And Pyranochalcones: A Structure-Activity Study
Aigner, Ludwig,Bieler, Lara,Couillard-Despres, Sebastien,Priglinger, Eleni,Riepl, Herbert M.,Urmann, Corinna
, p. 2675 - 2682 (2021/10/12)
Loss of neuronal tissue is a hallmark of age-related neurodegenerative diseases. Since adult neurogenesis has been confirmed in the human brain, great interest has arisen in substances stimulating the endogenous neuronal regeneration mechanism based on ad
Biocatalytic Friedel–Crafts Acylation and Fries Reaction
Schmidt, Nina G.,Pavkov-Keller, Tea,Richter, Nina,Wiltschi, Birgit,Gruber, Karl,Kroutil, Wolfgang
supporting information, p. 7615 - 7619 (2017/06/13)
The Friedel–Crafts acylation is commonly used for the synthesis of aryl ketones, and a biocatalytic version, which may benefit from the chemo- and regioselectivity of enzymes, has not yet been introduced. Described here is a bacterial acyltransferase which can catalyze Friedel–Crafts C-acylation of phenolic substrates in buffer without the need of CoA-activated reagents. Conversions reach up to >99 %, and various C- or O-acyl donors, such as DAPG or isopropenyl acetate, are accepted by this enzyme. Furthermore the enzyme enables a Fries rearrangement-like reaction of resorcinol derivatives. These findings open an avenue for the development of alternative and selective C?C bond formation methods.