A convenient microwave-assisted 5-amination of flavones
摘要:
A few examples of 5-aminoflavones' syntheses exist in the literature and for those, which are described, the amino group is introduced before the formation of the flavone skeleton. We describe here an efficient method, which permits the access to 5-aminoflavones by a simple procedure Using all SNAr amination under microwaves irradiation. (C) 2008 Elsevier Ltd. All rights reserved.
Semisynthesis of Linarin, Acacetin, and 6-Iodoapigenin Derivatives from Diosmin
作者:Jérôme Quintin、Guy Lewin
DOI:10.1021/np040079b
日期:2004.9.1
Semisynthesis of linarin and acacetin from the Citrus flavonoid diosmin was performed via, as first intermediate, the 3'-O-phenyltetrazolyl ether of diosmin. This paper relates also a semisynthetic access to 6-iodoapigenin derivatives, which are key compounds in the synthesis of some biflavonoids such as robustaflavone.
Mosquera; Orjales, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1996, vol. 35, # 1, p. 19 - 22
作者:Mosquera、Orjales
DOI:——
日期:——
Flavonoid-Related Modulators of Multidrug Resistance: Synthesis, Pharmacological Activity, and Structure−Activity Relationships
作者:Jacques Ferté、Jean-Marc Kühnel、Geneviève Chapuis、Yves Rolland、Guy Lewin、Marc A. Schwaller
DOI:10.1021/jm981064b
日期:1999.2.1
A series of 28 flavonoid derivatives containing a N-benzylpiperazine chain have been synthesized and tested for their ability to modulate multidrug resistance (MDR) in vitro. At 5 mu M, most compounds potentiated doxorubicin cytotoxicity on resistant K562/DOX cells. They were also able to increase the intracellular accumulation of JC-1, a fluorescent molecule recently described as a probe of P-glycoprotein-mediated MDR. This suggests that these compounds act, at least in part, by inhibiting P-glycoprotein activity. As in other studies, lipophilicity was shown to influence MDR-modulating activity but was not the only determinant. Diverse di- and trimethoxy substitutions on N-benzyl were examined and found to affect the activity differently. The most active compounds had a 2,3,4-trimethoxybenzylpiperazine chain attached to either a flavone or a flavanone moiety (13, 19, 33, and 37) and were found to be more potent; than verapamil.
Regioselective 6-iodination of 5,7-dioxygenated flavones by benzyltrimethylammonium dichloroiodate
作者:Jérôme Quintin、Guy Lewin
DOI:10.1016/j.tetlet.2004.03.038
日期:2004.4
The iodination of 5,7-dioxygenated flavones with 1 equiv of benzyltrimethylammonium dichloroiodate (BTMA·ICl2) in the system CH2Cl2–MeOH–CaCO3 at room temperature is presented in this note. Flavones with a free phenol group at C5 and an alkoxy or a peracylglycosyloxy at C7 lead to the 6-iodoflavones with a good regioselectivity (ratio 6-iodination/8-iodination about 9).
A few examples of 5-aminoflavones' syntheses exist in the literature and for those, which are described, the amino group is introduced before the formation of the flavone skeleton. We describe here an efficient method, which permits the access to 5-aminoflavones by a simple procedure Using all SNAr amination under microwaves irradiation. (C) 2008 Elsevier Ltd. All rights reserved.