Straightforward C-8 alkylation of adenosine analogues with tetraalkyltin reagents
作者:Petros Mamos、Arthur A. Van Aerschot、nancy J. Weyns、Piet A. Herdewijn
DOI:10.1016/s0040-4039(00)74226-2
日期:1992.4
A one step synthesis of the 8-methyl-, 8-ethyl -and 8-vinyl derivatives of adenosine, 2′-deoxyadenosine and 2′,3′-dideoxyadenosine starting from the readily available 8-bromo congeners is described. This reaction makes use of a transient silylation procedure and a Pd(0) catalysed cross-coupling with tetraorganotin reagents.
We synthesized various substituted 8-styryl-2'-deoxyguanosine and 8-styryl-2'-deoxyadenosine derivatives. Among them only acetyl substituted 8-styryl-2'-deoxyguanosine analog 5b showed a remarkable solvatochromicity (Delta lambda(em)(max) = 91 nm), that is, strong fluorescence at 477 nm in 1,4-dioxane, but in methanol the fluorescence was red shifted to 558 nm with very low intensity. Such environmentally sensitive solvatochromic fluorescent guanosine analogs may be useful as a sensor for investigating interactions of DNA with DNA binding proteins. (C) 2010 Elsevier Ltd. All rights reserved.