Nucleosides and nucleotides. 132. Synthesis and biological evaluations of ring-expanded oxetanocin analogues: Purine and pyrimidine analogues of 1,4-anhydro-2-deoxy-d-arabitol and 1,4-anhydro-2-deoxy-3-hydroxymethyl-d-arabitol
An efficient new method for the synthesis of isonucleosides is described. The key step in the synthesis was the direct coupling of purine and pyrimidine bases with the cyclic sulfate of a carbohydrate intermediate. This reaction proceeded with high regiospecificity and stereospecificity.