First Synthesis of Fully Deprotected Diimidotriphosphoric Acid and Derivatives Designed for the Synthesis of "PNPNP" Nucleotides and Dinucleotides
摘要:
The first synthesis of fully deprotected diimidotriphosphoric acid is described. The PNPNP sequence is obtained from an all protected cyclic precursor that can be regioselectively mono- or bis-functionalized with alcohols and amines in classical organic solvents. All protective groups can be removed at the end of the synthesis by catalytic hydrogenation to afford the corresponding PNPNP derivatives as a salt. The strategy developed allows a straightforward access to a new class of nucleotide and dinucleotide analogs as well as other triphosphorylated compounds of biological relevance.
final deprotection step was achieved by catalytic hydrogenolysis. The biological properties of the compounds have been evaluated toward transducin, the G-protein of the visual photoreceptor. Three guanosine imidodiphosphate derivatives bearing a linker at different positions on the sugar and on the base were then prepared and evaluated, giving some insight into the GDP binding site of transducin.