Solid-phase synthesis of 7-substituted 3H-imidazo[2,1-i]purines

Solid-Phase Synthetic Strategies for the Preparation of Purine Derivatives

This Review summarizes all of the currently described strategies applicable for the solid-phase synthesis of purine derivatives. The individual approaches are classified according to the immobilization procedure used resulting in a linkage of the final scaffold at various positions.

Desilylative activation of TMSCN in chemoselective Strecker–Ugi type reaction: functional fused imidazoles as building blocks as an entry route to annulated purines

Nucleophilic activation of TMSCN as an isocyanide equivalent by DABCO–THF in the Strecker–Ugi reaction facilitates the synthesis of functional imidazoles which, as building blocks, afford access to C8–N9 annulated purines.

Synthesis of 7-substituted 3-β-D-ribofuranosyl-3H-imidazo[2,1-i]purines

A method for the synthesis of 7-substituted 3-β-D-ribofuranosyl-3H-imidazo[2,1-i]purines has been devised whereby compounds were prepared in a few steps from a common intermediate, 3-(2′,3′-O-isopropylidene-β-D-ribofuranosyl)-3H-imidazo[2,1-i]purine-7-carbaldehyde, obtained from the reaction of 2′,3′-O-isopropylideneadenosine with bromomalonaldehyde. The formyl group of the carbaldehyde was subsequently reductively aminated and the resulting secondary amines were then further derivatized either by acylation, lactamization or reductive alkylation.