New water soluble Pd-imidate complexes as highly efficient catalysts for the synthesis of C5-arylated pyrimidine nucleosides
作者:Anant Kapdi、Vijay Gayakhe、Yogesh S. Sanghvi、Joaquín García、Pedro Lozano、Ivan da Silva、José Pérez、J. Luis Serrano
DOI:10.1039/c4ra01326c
日期:——
Recyclable water-soluble Pd complexes were revealed as excellent catalysts for Suzuki–Miyaura cross-coupling of challenging substrates like the antiviral nucleoside analogue 5-iodo-20-deoxyuridine.
Following our previous results on an environmentally benign one-pot Sonogashira-cyclization protocol to obtain substituted furopyrimidine nucleosides under aqueous conditions, we investigate herein the Suzuki-Miyaura cross-coupling reactions of aryl and heteroaryl derivatives at the C5 position of unprotected 2'-deoxyuridine in the same media with a common catalyst system avoiding exotic ligands, since palladium acetate and triphenylphosphine afforded the expected products in moderate to good yields.
Linear free energy relationship studies of enzyme active site binding: thymidylate synthase
作者:George Chang、Douglas Schwepler、Charles J. Decedue、Jan Balzarini、Erik De Clercq、Mathias P. Mertes
DOI:10.1021/jm00401a013
日期:1988.6
The requirements for active-site binding of thymidylate synthase from three sources, Lactobacillus casei, murine leukemia L1210, and human lymphoblast (Molt/4F), were investigated by analyzing the binding of a series of 5-(p-substituted phenyl)-2'-deoxyuridylates (N1-substituted 5-aryl-2, 4-dioxopyrimidines) to the enzyme. Multiple regression analysis revealed that an increase in electron density of
We prepared RNA duplexes possessing 2'-O-(1-pyrenylmethyl)adenosine and 5-(4-nitrophenyl)uridine base pairs. In the duplexes, pyrene serves as a photo-excitable electron donor and 5-(4-nitrophenyl)uridine acts as an electron acceptor. The donor-acceptor-modified RNA duplexes showed very weak fluorescence originating from the pyrene monomer and excimer emissions, which Occur due to electron transfer from the excited pyrene to the nitrobenzene acceptor. (C) 2010 Elsevier Ltd. All rights reserved.
CHANG, G.;MERTES, M. P., J. ORG. CHEM., 52,(1987) N 16, 3625-3631