Efficient Synthesis of Ratiometric Fluorescent Nucleosides Featuring 3-Hydroxychromone Nucleobases
摘要:
The synthesis of a novel class of fluorescent nucleosides featuring 2-aryl-3-hydroxychromones (3-HC) as base analogues is described. Nucleoside la bearing the 2-thienyl-3-HC nucleobase was prepared using sequential aryl-aldol condensation/cycloetherification or a Friedel-Crafts glycosylation as key steps. The synthesis of the triazolyl derivative 1b was achieved using a convergent 1,3-dipolar cycloaddition strategy. Fluorescence studies show that 3-HC-thienyl-nucleoside la displays high sensitivity of its dual emission to polarity changes and therefore is highly promising for nucleic acid labelling. (C) 2009 Elsevier Ltd. All rights reserved.
Efficient Synthesis of Ratiometric Fluorescent Nucleosides Featuring 3-Hydroxychromone Nucleobases
作者:Marie Spadafora、Victoria Y. Postupalenko、Volodymyr V. Shvadchak、Andrey S. Klymchenko、Yves Mély、Alain Burger、Rachid Benhida
DOI:10.1016/j.tet.2009.07.021
日期:2009.9
The synthesis of a novel class of fluorescent nucleosides featuring 2-aryl-3-hydroxychromones (3-HC) as base analogues is described. Nucleoside la bearing the 2-thienyl-3-HC nucleobase was prepared using sequential aryl-aldol condensation/cycloetherification or a Friedel-Crafts glycosylation as key steps. The synthesis of the triazolyl derivative 1b was achieved using a convergent 1,3-dipolar cycloaddition strategy. Fluorescence studies show that 3-HC-thienyl-nucleoside la displays high sensitivity of its dual emission to polarity changes and therefore is highly promising for nucleic acid labelling. (C) 2009 Elsevier Ltd. All rights reserved.
A Mild and Efficient Protocol for the Protection of 3-Hydroxychromones Under Phase-Transfer Catalysis
作者:Alain Burger、Dmytro Dziuba、Rachid Benhida
DOI:10.1055/s-0030-1260034
日期:2011.7
A mild and efficientprotocol for the introduction of different protecting groups on 3-hydroxychromones (3-HCs) under phase-transfer catalysis conditions in toluene or dichloromethane/aqueous potassium hydroxide system in the presence of crown ether has been developed. The method is useful for the protection of base-sensitive chromone derivatives. Protected chromones are easier to handle and to purify