Synthesis of Bis- and Trisoxazole Derivatives via Suzuki-Miyaura Cross-Coupling Reaction and van Leusen Oxazole Synthesis
作者:Sambasivarao Kotha、Vrajesh Shah
DOI:10.1055/s-2007-990865
日期:2007.12
3 -symmetric oxazole derivatives are synthesized via the Suzuki-Miyaura cross-coupling and van Leusen oxazolesynthesis. Here, bis- and triscarboxaldehydes were obtained via the Suzuki-Miyaura cross-coupling and further treated with p-toluenesulfonylmethyl isocyanide (TosMIC) in the presence of potassium carbonate as a base and methanol as a solvent to deliver the corresponding oxazole derivatives.
C 2 - 和 C 3 - 对称恶唑衍生物均通过 Suzuki-Miyaura 交叉偶联和 van Leusen 恶唑合成法合成。在这里,通过 Suzuki-Miyaura 交叉偶联获得双和三甲醛,并在碳酸钾作为碱和甲醇作为溶剂的存在下,用对甲苯磺酰甲基异氰化物 (TosMIC) 进一步处理,以提供相应的恶唑衍生物。
Sequences in the HSP90 promoter form G-quadruplex structures with selectivity for disubstituted phenyl bis-oxazole derivatives
作者:Stephan A. Ohnmacht、Marialuisa Micco、Vanessa Petrucci、Alan K. Todd、Anthony P. Reszka、Mekala Gunaratnam、Marta A. Carvalho、Mire Zloh、Stephen Neidle
DOI:10.1016/j.bmcl.2012.07.065
日期:2012.9
The HSP90 protein is an important target in cancer. We report here that stable quadruplex DNAs can be formed from a promoter sequence in the HSP90 gene, on the basis of melting, circular and NMR studies, and show that these can be selectively targeted by non-macrocyclic quadruplex-stabilizing phenyl bis-oxazole derivatives. These do not bind significantly to duplex DNA and show low stabilization of the human telomeric quadruplex. These results suggest an approach to targeting HSP90 at the DNA level. (C) 2012 Elsevier Ltd. All rights reserved.